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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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01-08-2020, 05:12 PM | #43 |
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Definitely no complaints, but that's also the value of going to one of the top tuners for this platform. I still run the UQFQ, but I'm now running the JRSC with the PTuning Header and PTuning Flex Fuel Kit
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01-09-2020, 06:24 PM | #44 |
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I know I'm late here, but yeah header+tune on my 2017 made a very noticeable difference. I also have a catback and can confirm that it's pretty much just noise, I feel like it might have improved throttle response a tiny bit but have nothing to back that up and it's probably just in my head.
I would suggest starting off with just OFT if you're on the fence at all or can't swing a catless header. I never ran the tune without the header, but from what I've heard it still does a very good job of evening out the torque dip. Also kind of agree with what was said about EL vs UEL headers earlier in the thread. I went with an UEL, and while I do love the sound of it with my Tanabe I'll probably end up switching to a 4-2-1 EL as my build becomes more track oriented. Even if UEL improves the weak midrange better than EL, it seems to be leaving more potent gains on the table in order to address something you can often avoid via your driving. Probably better to exaggerate the engine's strengths rather than try to make up for its weaknesses? But then I guess you get into the argument of focusing on the gains you see every day in street driving vs maximizing the performance of the car running all out. Anyway, I'm still learning a lot here and certainly not an expert! |
01-18-2020, 08:33 PM | #45 |
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01-18-2020, 11:17 PM | #46 | |
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I believe ACE is the only company that gives you options to more suit your setup. No matter how good marketing is, my money is on fluid and thermal dynamics. Because physics. Have a read https://www.onallcylinders.com/2015/...header-tuning/
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01-19-2020, 02:30 AM | #47 |
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My car is completely stock except for all the mods.
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01-19-2020, 03:19 AM | #48 | |
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01-19-2020, 06:38 AM | #49 | |
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Were both tuned to suit the headers? Same vehicle? Same tuning software? I've not seen it, apart from internet dyno plots, from different cars, I have seen a EL header tuned to outperform a UEL header throughout the rev range though. Same car, same tuner. When I first had my car tuned I asked my tuner what header design I should go with, he said only get a UEL header if you want "the boxer rumble", IIRC he recommend a SME or an ACE. I did pick up a Tomei UEL cheap and gave it a go out of curiosity, (costly mistake) as he said, no additional gains anywhere in the midrange, it was obnoxiously loud though and lasted about 2 weeks before I went back to the decated OEM, with the added noise and lack of any performance gain it was a no brainer to revert back. I do currently run a UEL header now though, as the best option for me, for numerous reasons, was the AVO turbo, the turbo does muffle most of the additional noise though. Plus the first basic mod for an EJ25, I had a 2015 STI, is to install a EL header which gives more everywhere when tuned to suit. A Killer B 4:1 holy header is the pick over all UEL headers. In saying all this the "dip" was never a issue for me, even when the car was stock, plodding around town I never noticed it, and if was up it my RPM was never that low to be in the so called hole. My over opinionated opinion is still that the whole after market UEL header thing is good marketing. As always, opinions may vary.
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01-19-2020, 07:48 AM | #50 |
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I do not have the dyno of tomeis headers, but I should find the logs I have of cars with tomei el and uel
EL has an obvious torque dip, clearly visible from the engine load, fuel quantity total and maf voltage curves in the log Tomei Uel is almost flat on the dip zone, not as much as cs400 and 350 ace headers But i have this dyno of 2 cars same dyno, same day, same tuner, same exact fuel 100ron, SAME AFR, same front lambda scaling, same tuning overall (PI/DI ratio, DI injection angle, PI scaling, etc) the ignition timing in both car, are maximized to knock limit Differences are: -bold line: hks UEL , front hks decatted -thin line: skunk2 EL 4:1, stock front catted In this particular Bapro Dyno, a stock car pulls around 130whp peak, and 174-175 calculated bhp as you say, opinions may vary |
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01-24-2020, 06:45 AM | #51 |
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Totally worth the money! Check mine's before and after (torque and power on wheels).
HKS Catted header, AVO overpipe, HKS dual resonanted Frontpipe and tuned on ECUTEK. Gained torque within all RPM Range while consumption decreased! Its a totally different car. Definitely worth it! |
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03-30-2020, 11:53 AM | #52 | |
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03-30-2020, 01:10 PM | #53 |
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It's not that factory didn't consider torque dip as issue. They considered being able to certify car/exhaust for latest emission standards, for car to be allowed to sell, not having to add to price sums to pay for gov't for (if) more polluting car, to be more important then fitting exhaust of more efficient power-gains wise and fixing that "torque dip issue", but which in these days can be sold as "for offroad use only". You are modding/changing/decreasing catalisator (especially cold-starts) efficiency on your own. See nothing wrong with factory choosing different given legal constraints and see nothing to blame toyobaru for.
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03-30-2020, 01:43 PM | #54 |
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The updated factory header makes the dip even worse and this is not because it makes the car greener and with better emissions. We couldn't get it in Europe and we still have the old one, so it is not greener. It looks that there were also other priorities, like having a better top end performance. It has been said a couple of times even by official people. Not that big of an issue if someone knows how to use the available power band.
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04-03-2020, 12:42 AM | #55 | |
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04-03-2020, 12:09 PM | #56 | |
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I'll also add a catback exhaust, just for the sound, either a Perrin 2.5" or maybe Nividia R400. Not planning any other changes except for a Blitz drop-in air filter. But, everything is on hold for now... |
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