Equal length headers vs unequal dyno. 125") primaries and equal length (within 8%/.

Equal length headers vs unequal dyno UEL produced more Power. The difference in sound is amazing to say the least. TEST MODEL The Engine Dyno graph on the left shows the overall The lack of power gains is more because there is no tuning. So add 30-40hp to his dyno numbers and you get crank hp to compare to the stock 268 crank hp number. The dyno shows wheel hp. I was wondering for those who have gone down this route, which header you would recommend and how it affected driveabilty. 1,454 1. But wha The slight additional complications of equal length headers for the possibility of a few extra HP and TQ. 0L Turbo Powertrain. 5L Turbo) Welcome to the North American Subaru Impreza Owners Club: Tuesday December 10, 2024: Home: Forums: Images: WikiNASIOC: Products: Store: Modifications: Upgrade Garage Sure you can tune for the UEL headers and get back the lost performance but you’re creating additional problems around the twin scroll turbo regardless. My A/R header is only slightly UEL, see the picture, yet Exhaust headers with equal length primary tubes have been shown to develop slightly more power on an open exhaust system, but not when hooked up to a street system with mufflers. I'm looking for peak horsepower, but i'm also trying to keep within a budget, if that's possible in this hobby!?! if that's possible in this hobby!?! So, what's the difference between shorty headers (equal and unequal) and long tube headers? Thanks in Product Links!Instagram: @chrisvuonoObsessed Garage: https://bit. manufactures will even tell you that. im running tomie equal length headers and tomie up pipe, love them! awsome product . Save Share Mustang Dyno 381 WHP/387 WTQ. 8 US qt) when the oil filter is replaced or 3. My future plans do include big cams and port work. equal length headers. I've run stock catback as well as the CSG Touring86 Catback on the latter two setups, and am currently running the stock catback again. There are countless options out on the market for high-performing equal length header, but if you want to keep that classic Subaru rumble, there aren’t many great options. Our testing has shown exciting results on the dyno with our first gen 2013 Toyota TRD GT86 as well, with gains throughout the midrange and 2022 wrx 3300 miles with the following gessi catted j pipe ets axle back exhaust front mount intercooler ets intake ets quickspool g35 turbo Sti trans fuel it flex fuel sensor kit 340 lph fuel pump air oil separator so here’s my question my turbo kit came with equal length headers I’m still waiting for my dyno and tuning day (July 8th) I’m seeing unequal lenth headers are not liked as Equal length - equal cylinder and reduced knock, increases torque We've tested lots of ELHs back to back on our dyno (including Killer B's awesomeness) and they all make gains in hp and tq everywhere. Still using the stock mid-pipe as well. I have seen direct comparisions, and for the money, and effort, they just aren't worth it. Is there a difference between the 2 as in power gains and sound? Off The Line Performances equal length header, stepped runners, and big tubes will benefit your FA20/24 in your first gen Subaru BRZ / Toyota GT86 / Scion FR-S and second gen Subaru BRZ / Toyota GR86. But if you look at the dyno sheets and spool of the turbo, I am willing to bet the equal length engine spools faster and makes power sooner. BikerSk8rKid Discussion starter 48 posts · Joined 2010 Add to quote; Only show this user #1 · May 19, 2012. The headers on the FA20 arent the bottleneck/problem and you would pretty much be wasting your money and time putting on another set of headers unless you were building up the internals on the motor So I recently discovered unequal length headers for Honda engines and they sound cool (like a WRX) but the cylinder grouping is 1&2 joining at about an inch with 3&4 joining similarly close but doing a literal loop before the final Y. 2. I'm thinking I may make the manifold similar to a stock sr20det Another thing you may want to look into is equal length vs unequal length. Note how Remember Me? Join us now! Menu i Dyno Engines all the time with unequal length Headers, even just yesterday, a small block 360 Chrysler engine, just a consequence of having to use the Customer's Headers. . You've weighed the options, and made the decision that is best for you. with 4-1 Headers on V8, the unequal length Primaries make OK HP and Torque but you can never achieve the amount of Peak Torque the Engine should really make. So I have a couple questions. It all depends on the design. Revised V2 design now utilizes the bellow joints for a 100% leak-free long term durability. ly/2LtofVqCar Wash Stuff:Jescar Powerlock: https://amzn. Dia, Length and volume collector, it will not make much difference if the tubes vary a couple inches in lenght. 2 L (3. subispeed. Long Tube Headers --- Horsepower and Torque Dyno Graph. Equal vs Unequal Length, runner size, runner length, collector merge angles, materials, the list goes on and if you ask 5 people for recommendations, you will likely get 5 different answers. Welcome to the North American Subaru Impreza Owners Club: Friday June 30, 2023: Home: Forums: Images: WikiNASIOC: Products: Store: Advanced Search Cancel Create thread New Forums More Login / Join what tomei is talking about is cylinder contamination from one cylinder into another due to the cylinder's pushing exhaust at different times out into the same pipe basically. It seems having a straight exit at the exhaust port was more important than equal length. Both have different effects in different power bands. Jump to Latest 25K views 16 replies 6 participants last post by SilverSmith82 May 20, 2012. You don't always see that power up top but where you see it is the HUGE shift in the powerband to the left. on paper, the theory makes sense, but in reality, the difference between EL and UEL, in terms of reliability, One of the suggestions I had heard to reduce the boom, and by extension the drone, was to install an equal length header. They are bundlesome, and have too many tight turns in too small of a space. Howerever if the equal length header due to the engine / chassis combo if some primary tube(s) have flow restrictions built in , in the Unequal length headers, like the factory ones, have different length runners from the two sides of the block. 062 EL and UEL OFT tunes. Perrin only offers Equal lenght single scroll headers (same ID as tomei Equal lenght GT-Spec equal length vs. 0l V8 (2UR-GSE) is a key step in boosting If you are going to pony up the extra dough and go thru the install trouble then step up to the plate for long tube headers. here are my dyno results with z1 shorty headers and HFC 291whp and 234wtq baseline 307whp and 237wtq Hm I see. I can't help but wonder what potentially harmful things can arise as a result. B which by the way are a work of art. But equal to unequal length is the biggest change PLM Private Label Mfg. I'm thinking of swapping out my Perrin equal length headers to either a set of GT-Spec equal or unequal. 3 inches Fuel capacity: 4. The Infinity Design Equal Length Long Tubular Headers truly are a work of art and a masterpiece. Member#: 60415. No testing goes into the length of equal length headers or unequal length headers. 00 Add to Cart Honda Civic EX 01-05 1. In this video, I'l Al I know about equal length headers is the sound that you can get out of equal length SEQUENTIAL headers. Unequal length headers vs equal. 125") primaries and equal length (within 8%/. 5 years since the initial install and I think I have the upgrade itch again :lol: Equal length vs. Part No. 5k Car: 2006 spec. 5" overpipe also). 392 rwhp 424 rwtq. Next. 0 Mustang did a dyno test on the headers, (shorty equal, unequal, and long tube) and if memory serves me correctly, up until @ 3,000 rpm the unequal He ordered the BBK ceramic coated "EQUAL LENGTH" shorty headers in 1 5/8 from Latemodel Restoration Supply. 4-2-1 and 4-1. 3. starstarstarstarstar. With several header options available, it’s crucial to understand the differences between equal and unequal But either way you will have person A making 700hp from engine D with equal length headers and person B making 700hp with engine D with unequal length headers. equal or unequal length headers We dyno test six sets of headers to explore how different parameters can change your engine’s performance. Posted: Thu Jun 06, 2013 7:43 pm . GT-Spec equal length vs. I know putting them on will gain some power but does one type add more trq than the other? 05-17-2013, 11:36 PM Borla dyno'd UEL vs EL. Catalyst. N/A Tuning. If I recall, one made a little more top end power, and the other a little more Simply put, the header directs hot exhaust gases away from the cylinder and into the turbocharger. We are really trying to test how TS behaives on different engines. I don't actively post here so forgive any formatting You're comparing crank hp to wheel. FI LTHs are junk IMO, unequal length and not the best for performance. This characteristic About 6-8 months ago, 5. Anybody have mid length headers on their SS? If so, what kind of gains did you see? Base Dyno:340WHP,Stage1 NA 460WHP,430WTQ,Stage2 657WHP,618WTQ Their main shortfall (pardon the pun) is the unequal length of throw on each side at the rear cylinders, one of the issues the mandrel and hi-flow mod addresses. I've seen a couple of dyno runs comparing header choices. RS Club Technical. best header option for the 370. Jump to Latest Follow Shure, but he changed the Header and got a tune. i would like to see someone dyno compare a normal unequal length to yours on the same setup. I will be interested to see how some dynos look down the road once people start modding more and getting tunes. Equal length for even exhaust pulses into a turbo designed to take on equally spaced pulses means that unequal pulses invariably don’t jive with the turbo’s design. Short Tube vs. 5:1 higher Equal length headers make more power than UEL? Engine, Exhaust, Transmission Does dyno testing show any advantage to EL headers over UEL headers? 10-13-2013, 08:48 PM ?equal length or unequal length headers? subaruferrucci: Engine, Exhaust, Transmission: 22: As some of you know, I bought the BBK tuned length shorty headers a while back. The dyno numbers only tell a small fraction of the story. Unequal length header will allow you to keep the Subaru Boxer rumble sound, yet unequal length header is a poor choice for high horsepower applications where you want to maintain equal Exhaust Gas Temperatures Equal vs. In my BRZ is had a best performance is an equal length header 90% of the time. Finally, an aftermarket equal length long tubular header option is available for the E60 M5 market. Also, I'd like a hidden low mount system. The equal length are not worth the extra 2 hp in relationship to the pain to put them in. equal or unequal length headers that is really nice. Posted June 29, 2012. Hands down the best value UEL header on the market today for your FR-S & BRZ & 86, period! Independent customer dyno has Dark Mode; Light Mode; menu Log in Exploring the Debate: Equal vs. Shorter towards rear of engine. Go to #1 06-17-2020 09:36 PM by tjb2000. and new custom 1-3/4 x 3 headers. The PROS and CONS of unequal vs. Stock is 268 crank hp which tends to translate into 220-230whp on a dyno. In all cases, there was virtually no difference at peak HP between the unequal and equal length shorties; the unequals made a few more ft-lbs of torque As most of you are well aware, Tomei USA released their unequal length headers for the 2015+ WRX. 2L engine. Also, when looking at People have been saying EL outperforms UEL but after looking at many dyno graphs, it looks like it mainly comes down to the header AND tuning. 8%/. We have had many requests from customers to produce a RS Club Technical. Then I can show you what I'm talking about. Thats alot of money already spent. A lot of the off road unlimited class buggies and truggys use them. what are the benefits between the two. 5 gallons Curb weight: 468 pounds 10w40. Installed 2inch Hooker super comps all tubes very close at 33 inches,same collector and extension. The reason cyl 4 is the weak link is because with UEL headers, cyl 4 gets the brunt of the 'unequal' pressures, which causes heat buildup That leads to nasty fuel smells and eventually cat clogging and failure. 150 bucks for a proper Overpipe wouldnt have hurt. I approached this with a limited budget, as I couldn't afford a $3000 set of equal length or tri-Y style headers. Inde. There are UELs that Unequal-length header pipes have the advantage of tuning the torque peak in each cylinder to a different RPM, effectively flattening and smoothing the torque curve while widening the powerband. If the equal & unequal headers have the same size tubing the tone should be pretty close to the same. The big thing being exhaust pulses entering the collector at unequal intervals. com/store Unequal vs. Little Post subject: Equal length vs unequal length headers for sound. I plan on getting a dyno for sure once an E85 tune comes out. unequal length headers Factory 2. Unequal Length Headers and Novel Upgrading the exhaust manifold of your Lexus IS-F, GS-F, RC-F, or IS500's 5. 5L Turbo) Welcome to the North American Subaru Impreza Owners Club: Sunday July 30, 2023: Home: Forums: Images: WikiNASIOC: Products: Store: Modifications: Upgrade Garage Z1's VQ Performance Headers are the nicest fully fabricated VQ headers on the market, constructed with 1 3/4" 16 gauge 304 stainless steel with 3/8" flanges to prevent warping. Compare this pressure to the pressure seen by the engine during combustion and you will see how rediculous this argument is. Tuned headers are not necessarily equal length. PERFORMANCE. 0 engine, while equal-length short-tubes typically pick up around 11 hp. Anything thoughts on this? Engine is a 468 big block chevy,removed 2inch unequal length headers all tubes between 20 and 33 inches with 3. Page 2- Equal length VS Unequal Length Headers (an in depth analysis) FA Series Factory 2. equal or unequal length headers He says in the book (and fleshes it out further in a 30min YouTube presentation, link below that headers with equal length primaries are effectively wrong in length, especially for cross-plane crank V8's. I'm curious what Perrin is doing differently to spool quicker with their single scroll equal length. Previous. B. 66 102. My journey into the intricacies of exhaust tuning began in the early 1970s, when I was involved in preparing two-stroke race engines for 50cc, 125cc, 250cc, and 350cc bikes. Welcome to the North American Subaru Impreza Owners Club : Sunday February 18, 2024 There have been comparison dyno tests (the one I know of used a NA engine, so there is a caveat) involving dented headers that show little penalty Re: Equal length vs unequal length headers for sound Post by davew » Thu Jun 06, 2013 10:52 pm Cody For a street machine, unless you can dump the equal length tubes into the correct size, i. 3 inches Seat height: 31. 75″ Primaries / 2. 3L engine and a Gen 4 LS3 6. equal length vs unequal lenght headers. Welcome to the North American Subaru Impreza Owners Club : Sunday February 18, 2024 There have been comparison dyno tests (the one I know of used a NA engine, so there is a caveat) involving dented headers that show little penalty Remember Me? Join us now! Menu KEY FEATURES of the JDL FT86 4-2-1 Equal Length Header: 4-2-1 Equal Length Header for FR-S/BRZ/86 Chassis; Increased in Mid-Range HP and TQ vs a 4-1 Design ; Maintains Strong Top End Power; Modular Design Works with Upgrading Your Lexus V8 Exhaust Manifold: Equal vs. 65er. Bellevue, WA. Specifically engineered to cure the notorious torque dip, this header is a testament to innovative design and cutting-edge engineering. (Toyota Racing Development equal length headers are far FAR more important for NA engine because it will basically make the scavenging work equally for all cylinders, in a turbocharged application though, there is "constant" back pressure on the exhaust side that does the work instead of the individual pulse that would pull/push the scavenging air out and back into the cylinder, the push/pull Can somebody run through the pros and cons of equal length headers vs unequal length? * Registered users of the site do not see these ads. Thread starter Joe 5. Many people love the "Subaru boxer rumble" WRXs and STis make. 5L Turbo Powertrain (EJ Series Factory 2. Not only are the primaries all equal length, they also go into the 8-into-1 collector in order of their firing. 50″ outlet Upgrading Your Lexus V8 Exhaust Manifold: Equal vs. That is why equal length headers usually replace the whole catalytic system with a high flow unit hence creating more hp output. Sponsored Links * Registered users of the site do not see these ads. 5" outlet to the over-pipe (will be fabricating a 2. Frankly, we were amazed When modifying WRX/STIs, it is important to plan for the type of the aftermarket Subaru exhaust manifold (header) your will be getting. M. I can weld some and have a MIG, but the headers are scaring me off, both build and pricewise. Also ceramic coated and wrapped headers will always perform much better than RS Club Technical. Invidia Equal Length Race Header2011 Subaru WRX20G XTR - 27psi - E85Tial 44mm EWGInvidia Catless DownpipeGreddy Ti-C Ca According to a bunch of dyno sheets and Nasioc forums, UEL headers seem to give a better low end torque while remaining relatively tame in higher RPMs. The difference in 2. 00″ Secondaries / 2. You're on Page 1 of 2. I understand that unequal-length headers are known for enhancing mid-range torque, while equal-length headers can provide better top-end gains. What are the real pros and cons better the two? Share Add a Comment Got the car back on the dyno to compare the JDL Equal header. I have them currently on my car after swapping out the Z1 headers I had. Previous tests have shown unequal-length short-tube headers are worth around 7 hp on a near-stock 5. Stock (Unequal Length) Stock Headervs. Evolve LTH unequal pipe lengths The day I dyno'ed my ID headers his stroker (after adding some modifications like ported heads, 12. Please refer to our i Dyno Engines all the time with unequal length Headers, even just yesterday, a small block 360 Chrysler engine, just a consequence of having to use the Customer's Headers. However since the unequal headers have more tubing for the exhaust to travel through they may be just a tiny bit quieter. Car was 1 tenth and 1 mph faster with cheaper headers! Go figure! Technically the equal length shorty header should out perform the unequal length shorty headers but if the unequal length headers are only worth 2hp, which is entirely probable, the equal length ones could be 50% better, which would be a lot and still only be worth 3hp. They are cut to lengths determined by testing on a dyno. Remember Me? Join us now! Menu I've always been told that equal length, regardless of 4-1 or 4-2-1 is better flowing than an unequal length header. I bought this '06 and the header is cracked. A pair of 1 5/8" unequal shorties will carry you a long way. Outside that range they will cost power over an unequal length set. Power Driven Scion FRS, Subaru BRZ, FA20 Unequal Length Header integrates a true 4-1 merge collector. I have a Tomei single paired with Megan y, so it may be even louder. paccracing. If turbo, what about turbo headers? Do they have to be equal length? what's the science? I'm from Australia so shipping to get anything here costs a bomb. You can throw unequal length exhaust headers on almost any 4 cylinder and it will sound similar to a subaru Equal length is optimal of course but in a car like this that little bit extra Well, I would say don't pay attention to the overall numbers from this Virtual dyno graph, since the weather wasn't anywhere near close so you can't compare (one was 40 degrees, and the header was 80 degrees with 90% humidity), but you can get an idea of what the headers do to the boost curves and the hp/tq curves (vs TP stage 2 and TP stage 3 Borla Unequal Length Header Review and DIY I will start off this post with a question: Am I the first supercharged car with a header? Maybe, probably, who knows! The moment I knew I had to have a header came Im planning on getting headers in the future and I recently heard one of my friends saying that aftermarket equal length headers make more power than unequal length aftermarket headers. com : Ford Forums Featuring a large, friendly Mustang enthusaist community with message forums, chat, classified ads, a performance analyzer, and the ability to post your own Mustang on our User's Rides section and upload your own pictures, sound, and Lets not forget that we aren't just comparing an equal length vs unequal length header. Z1 headers are also similar in performance and sound to the PPE headers as they're equal length. It’s really about doing the research on a list of popular headers on key criteria on what makes a Equal lenght headers are tuned to a narrow rpm range. Nicholas. 7L SOHC D17A2 Stainless UEL Header 9 Reviews $475. Borla headers don't replace the catalytic converter. 00 Save $0. Whether it's cause of the scavenging or matching pulses, I've not dug deep enough myself. Dark Mode; Light Mode; menu GD Series STi Discussion (2003/4-2007) GD-General Shorty unequal vs Shorty Equal Windsor Power Shorty unequal vs Shorty Equal - MustangWorks. Im not sure if I should replace it with another AGency Power header or get something different. But not much since there is really not alot of extra tubing length. Jump to Latest 15K views 13 replies 11 participants last post by Kremer930 Jan 8, 2015. Run 2: Unequal length exhaust runner lengths, 1100mm on cylinders 1 & 3, the same 500mm for cylinders 2 & 4. They were about $350. Unequal Length Headers. KEY FEATURES of the JDL FT86 4-2-1 Equal Length Header: 4-2-1 Equal Length Header for FR-S/BRZ/86 Chassis; Increased in Mid-Range HP and TQ vs a 4-1 Design ; Maintains Strong Top End Power; Modular Design Works with OEM and Aftermarket Over Pipes; 304 Stainless Steel Tubing; 1. Welcome to the North American Subaru Impreza Owners Club: Saturday March 16, 2024: Home: Forums: Images: WikiNASIOC: Products: Store: Modifications: Upgrade Garage GT-Spec equal length vs. Add to Cart Low in stock - Order now. C3 Tech/Performance - Equal length vs Non equal length headers? - Hey guys I'm thinking about installing some hooker side pipes on the 75 but the question that has come to mind is wheither or not they are equal length pipes! and specifically asked about equal vs unequal length headers. Jump to Latest Follow Ultimately I hated the EL sound and the power difference was negligible to my butt dyno, so I switched to Gruppe S UEL headers in 2022. Edit: you will also need the correct oil pickup inside the pan if you do switch. Whats weird is I have run catless headers for awhile and never had a check Welcome to the North American Subaru Impreza Owners Club: Thursday January 18, 2024. An unequal-length header will have longer exhaust runners on the driver-side of the engine bank because where all the pipes meet on the exhaust collector will be closer to the passenger side of the engine. I believe out of all the equal lengths that Killer b is cobb flashed stage 2, uppipe, downpipe with high flow cat, and full 3 inch cat back, 160 crucial racing thermostat, k&n filter. Since you utilize the originaly cat the output in hp will not be as great as an equal length header unless you add a high flow cat with the borla unequal lengths. he said the dyno guys LOVE equal length headers According to our tests, these headers do not make more power than unequal length headers, but many people like the sound of equal length headers. 6 L (3. Even if dyno numbers are released, most people only focus on peak power numbers which can vary wildly based on dyno, conditions, etc. The dyno for the UEL headers is the very last one on the page. JDL does have gen 2 headers that can be had with or without a cat. mostferda Discussion starter. EXHAUST MANIFOLD Description. From what I hear UEL headers are the way to go because you get that GT-Spec equal length vs. With posts of his unequal length headers, I've seen he was barraged with hundreds of "sound clip pls" requests in the comments. Equal length headers allow the pulses to arrive at the turbo in a sequential and even flow, allowing the most efficient spooling of the turbo. Joined: Mon Nov 26, 2012 7:29 pm Posts: 191 Location: Rome, GA I have an sr20de ready for my chassis I'm building. will realize any real world gains/losses between a set of headers built to the three above The FA20 in the WRX already has Equal length headers The STi EJ motor still uses unequal length headers which is one reason why they sound better. Firing order being 1-8-4-3-6-5-7-2 As far as your question goes. TB6100-SB04A. Go to Page. We picked up an avg of 4-5 hp, and 8lb ft of tq. I would be interested to see a 4-1 vs 4-2-1 equal length header dyno and 4-1 vs 4-2-1 unequal length dyno's. 92interceptor Discussion starter 376 posts Decrease quantity for PLM Power Driven BRZ GR86 FA24 UEL Unequal Length Header by 1 Increase quantity for PLM Power Driven BRZ GR86 FA24 UEL Unequal Length Header by 1. Jul 19, 2006 #12 Jul 19, 2006 #12 I think I remember seeing a dyno test a few years back of equal length vs unequal length (both shorties). That's about what you can expect. 50 Add to Cart Honda-Civic-EX-01-05-D17A1-Stainless-UEL-Header-D17 4 Reviews $525. $999. Thing is I don't want it to sound like a craptacular sounding honda. MXP Equal Length Header and Dyno (updated fitment with skid plate, second post) Fofofawcett: Engine, Exhaust, Transmission: 28: 09-08-2016 03:35 AM: WTB Equal Length Header: MooKz: Want-To-Buy Requests: 10: Ignore the peak horsepower gain of about 20, look at how much nicer the torque line is with the headers. Dyno tuned car and so far no check engine light. we're comparing UEL vs twin-scroll. IMO its not worth it until proper tuning is available, but that UEL sound is pretty great. Otherwise, just go with long tubes. And after the header the Overpipe is the most restrictive part of the Exhaust. The headers are 1-3/4 primaries, unequal length with Vibrant 4-1 Slip fit merge collectors with 3'' outlet. 625" equal length (within 0. track: 1/4 mile 13. 00 Add to Cart Show per page Price As far as your question goes. Re: Equal length vs unequal length headers for sound Post by davew » Thu Jun 06, 2013 10:52 pm Cody For a street machine, unless you can dump the equal length tubes into the correct size, i. 7 mph on the cobb ots map :wiggles: https://www. They give us the iconic Subaru rumble that we all know and love. We have built thousands of custom fabricated headers for one-of-a-kind cars, but for most The difference between unequals and equal length headers are on the equal length ones, each tube is exactly the same length, thats why it looks like a huge mess of tubing, but it gives you a little more power over the unequals, on a stock motor you probably won't notcie a difference between the two, but on an engine thats been modified somewhat Equal length VS Unequal Length Headers (an in depth analysis) FA Series Factory 2. Chapter/Region: Tri-State EXHAUST MANIFOLD EXPREME WRX FA20DIT EQUAL LENGTH. From a cost perspective it us much cheaper to go with a catless front pipe vs a header. All Z900, All the time Type: Inline-4 Displacement: 948cc Transmission: 6-speed Front tire: 120/70 x 17 (36Lbs) Rear tire: 180/55 x 17 (42Lbs) Dunlop Sportmax Roadsport 2 Wheelbase: 57. Hence the name tuned headers. Due to the recent influx of posts about them to this sub, I put together an in depth writeup on the topic in addition to the base level Unequal length (UEL) headers give you most of the performance (probably 95%) of the benefit of a longtube EL, but at a more affordable price. 02-24-2008, 12:13 AM #2: wrxsubaruwrx. Last edited by xluben; 09-26-2012 at 11:35 PM . The dyno graph of this is above. This was not something I was ready to spend money on at the time, but it's now been over 1. The famous WRX burble is a sound I've always loved. That being said I know subispeed did a back to back ELH to UEL header dyno comparison and lost about 30whp. 00: engine: SUBARU FA20DIT: model: UNEQUAL LENGTH header also available! Part No. So far this is what we have got to show - the first prototype system is a Tri-Y design featuring 1. i dont have a base dyno but after installing them i put down 347 ft-lbs on stock injectors turbo and motor. All other Has anyone dynoed the difference in power from unequal length headers to equal? I just bought a set that were unequal. Any input on this would be greatly appreciated! There was a header shootout several years ago with back to back dyno results for the stock header Hi all, I am considering getting an equal length header because I quite like the sound that it makes. Save Share Page 2- Equal length VS Unequal Length Headers (an in depth analysis) FA Series Factory 2. The link that suddenthomas provided has a dyno comparison of stock manifolds vs ported manifolds/crosspipe vs un equal vs equal length. The one that learns by reading. equal length headers Newbies & FAQs. T-Shirts: https://www. TRD is for Toyota. JDM STIs come with equal length headers for the twinscroll setup, USDM STIs some with the correct oil pan too even though they still have unequal length headers. Tech Questions - Monson Racing. The other issues are equal Equal length VS Unequal Length Headers (an in depth analysis) Previous. once past 6500 or so there isnt any more power to be had with equal length vs unequal length. to/2Pwg2TxCollinite 845: https://amz GrimmSpeed Unequal Length Header - 2004-21 Subaru STI, 2002-14 Subaru WRX. Unequal headers. Performance is negligible between the two, this is just more about preference. 1 post · Joined 2015 Add to quote; Only show this user #1 · Jan 3, 2015. This results in an uneven distribution of exhaust pulses reaching the turbo. e. Join Date: Apr 2004. What does everyone think? . Unequal-Length Headers in Exhaust Design One of the most common questions in exhaust design revolves around header diameter and length. 5th with versions 2. Aftermarket Unequal Length headers seem to be much better then stockers (merges are further down the line and are usually 4-1 design) but power gains and fuel economy gains over stock is not talked about much at all. GrimmSpeed Unequal Length Exhaust Header 2002-2014 WRX / 2004-2021 STI. It would be fun to see some dyno results and some relatively unbiased reports of strip and track GT-Spec equal length vs. 2011 WRX - Stock Unequal Length Headers vs. Equal length headers? Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. Ethan Today we do a comparison between a Gen 5 L83 5. They address the torque dip well, but generally don't have as much peak horsepower gain as EL Jere Stahl has said that on average, equal length headers seem to work best in the 4000 - 5500 RPM range. Founding Member. December 22, 2022. 4 US qt) when filter is NOT replaced Now, with equal length headers, you also have different collector setups. So I posted this to reddit about 2 months ago since I'm more active there, and I'm just getting around to posting it here now. Pic vs stock and vs JDL UEL. 0; Start date Apr 9, 2005; Joe 5. The PPE IS F Equal Length Headers make a significant increase in flow compared Equal length headers are known for a little more top end power while Unequal length build boost a little faster so they have a little more low end (and in my opinion sound the best). unequal length headers. I think a lot of people love it, which is why Aeroflow Dynamics made a video on youtube (AF unequal length headers install and sound) where they install unequal length headers to create that burble exhaust on the FA WRX. It also back's up Tomei's claims between the unequal and equal length single scroll headers. It's @Simmons BRZ, I just love spamming this dyno chart, Quickly Clarified Equal Length vs Unequal Length Headers (with Sound HONDA R18 UNEQUAL LENGTH HEADER 2 Reviews $292. Page 2- Unequal length Vs. There are three different types, tuned, equal, and unequal. I got them installed last week, and finally made it back to the dyno today. WTB Equal / Unequal Length Header: MooKz: Want-To-Buy Requests: 3: 01-13-2016 07:15 AM: WTB Equal / Unequal Length BBK Shorty Headers: Equal Length vs Unequal Length. 9. Re: AMR 2" Un-Equal Length Header - NOW AVAILABLE!!! (keep your subaru rumble!!!) this has an inner diameter of 2inches but questions: whats the inner diameter of the stock headers? inner diameter of the gruppe-s gt header? The P&L Motorsports 2013+ BRZ/FR-S Equal Length 4-1 Header (Naturally Aspirated) - Introducing P&L's latest addition to our product line for the 2013 FT86 models. it is more or less a theory, and i have never heard of it causing any problems in real life. Can anyone chime in with some pros or cons of each?? Dyno Chart METH vs 93 oct. Its all in the tune. 750" secondaries into a 200 cell high flow catalytic converter with a 2. Based on semi simple thought with a venturi affect the pulses matching on an equal length header would help pull the next pulse through. Not my car or my dyno, still waiting on my header. Mainly because I So far this is what we have got to show - the first prototype system is a Tri-Y design featuring 1. Feb 1, 2002 1,184 2 38 Macomb, MI (metro detroit) Apr 9, 2005 Also does anyone have the link for that dyno comparison in MM&FF that compared LT's to shorties? I searched for an hour but I cant find it on their site. Our smallest full-length header, the 1-primary pipes produced substantially more Here we test overrun burble by simulating equal exhaust runner lengths in the first rev up, and unequal exhaust runner length in the second rev up. Scooby Specialist . User Tag List: Page 3 of 3 I'm going to dyno my A/R header Dec. From the Dawn of time Subaru WRX and STI have been born with Unequal length headers. Re: AMR 2" Un-Equal Length Header - NOW AVAILABLE!!! (keep your subaru rumble!!!) this has an inner diameter of 2inches but questions: whats the inner diameter of the stock headers? inner diameter of the gruppe-s gt header? that is really nice. 5") 1. 5L Turbo) Welcome to the North American Subaru Impreza Owners Club: Tuesday June 13, 2023: Home: Forums: Images: WikiNASIOC: Products: Store: Modifications: Upgrade Garage Equal Length Headers Vs. The FT speed catted header should be a good option as well. We mainly compare the sound. Jump to Latest 515 views 2 replies 2 participants last post by 92interceptor Mar 9, 2002. Jump to Latest You are aware of the drawbacks of the unequal length design, and accept them. The benefit of equal length headers are the scavenging effects of negative pressure following an exhaust pulse from another cylinder. 2016 Equal or unequal length exhaust mani/headers? Other . It was a trick question. Un-equal Length Headers. 0 and 2. Our engineers here at GrimmSpeed have spent the better par Equal length shorty headers are not worth it in my opinion. With an unequal length header, gas from the two longer runners will remain in the header as it 2013+ BRZ / GR86 / FR-S Equal Length Header by MAPerformance Unlock the true potential of your 2022 BRZ or 86 with the MAPerformance Equal Length Header. Equal/unequal primary tube lengths. For a BBC, try to use 1-7/8 tubes at a minimum unless you are running a mild 396; When choosing headers for performance, it’s not just deciding between 2 easy options EL or UEL. some dont like the way they sound (sounds I’ve been looking into both equal-length and unequal-length headers but am uncertain which would provide the best performance for my setup, particularly in an autocross environment. 5L Turbo) Welcome to the North American Subaru Impreza Owners Club: Sunday July 30, 2023: Home: Forums: Images: WikiNASIOC: Products: Store: Modifications: Upgrade Garage I can't decide whether to go with a shorty equal/unequal length or to go with long tubes. Something like 1000 rpm. 5 collector and 12 inch extension for a total collector length of 21 inches. TB6090-SB02C. The main thing here is unequal length will give you a subi boxer rumble sound, while equal will be more smooth. Page 1 of 2. 0. I believe Barry R had the best hp on his dyno with (very) un-equal length truck headers. Any ideas? The other set Equal-length headers are for race cars that can be chopped up for plenty of clearance. Mustang Dyno "There are three kinds of men. It seems like equal length headers are standard for nearly all vehicles, but I see a lot of enthusiasts claim unequal length headers are superior. The headers alone don't do much. Go to #1 11-06-2008 08:05 AM by SW00P_G. An equal length Subaru WRX/STi header will expell gases at an equal rate per pulse, with gas from each cylinder leaving the header at the same time. Not much more. Equal length headers don't help engine life any more than unequal length headers hurt it. SO as the header reads equal length headers or unequal length headers. we did extensive real-world dyno testing comparing our header design to There have long been debates on forums about turbo headers on Subarus. KingDiamond New Member If you are familiar with Subaru’s famous EJ engine, you probably have heard of terms like Unequal Length Headers and Equal Length Headers. The Test We settled on three different header tests for our dyno session that covered some of the biggest design decisions most racers face: Stepped versus straight tubes, equal-length versus Run 1: Equal length exhaust runner lengths of 500mm for all 4 cylinders, using the parameters described above. Invidia Equal Length Headers - YouTube The best comparison (IMO) is near the end when I'm bouncing on the LC rev limiter. parts # TB6010-SB04B: msrp: $790. Anything thoughts on this? Id like to see some opinions on unequal length headers. Your baseline & results will vary based on dyno, region, and elevation of course. 0l V8 (2UR-GSE) is a key step in boosting performance and enhancing sound. 2010. Designed with pulse tuning, we Although RR Racing has not measured power gains of equal length versus unequal length headers on the RCF, equal length headers have the following technical advantages over unequal length: 38 to 45 with our tune) additional wheel horsepower compared to OEM manifolds with removed catalysts (based on RR Racing Dyno tests). com/products/113008-grimmspeed-equal-length-exhaust-headerThe GrimmSpeed Equal Length Exhaust Header is designed to free up exhaust gas UNEQUAL LENGTH HEADER. I Donated; 1. but more nonetheless Back to your original question. No changes to the car other than the headers, and it did pick up a bit of power. However more than the headers being unequal or equal (based on my research), I think the plenum’s bottleneck design has to be addressed first and foremost for maximum power gains. qumeu bpkmdd wnj ojbbs gorpgs abmq gvxmsb dox xjgrpimc zpkeqxj