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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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05-20-2015, 12:06 PM | #1 |
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Header & Exhaust combo for max power?
Any recommendations from the header back for maximum power while sticking with 1 cat for an STX build? Currently thinking a JDL header, overpipe, and catted front pipe with a perrin cat-back resonated exhaust. Opinions?
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05-20-2015, 12:09 PM | #2 |
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Perfect setup. I run that exactly. End of thread. I'll just save you a lot of time and you won't be disappointed.
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05-20-2015, 12:12 PM | #3 |
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Lol, thanks. EL or UEL header? Do you have a tune? If so, have you had your car on the dyno?
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05-20-2015, 12:15 PM | #4 | |
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I would say I am close to 200 whp on 93 octane, but without actually being on a dyno, that's pretty optimistic. With that fuel, and my setup, my tuner said he was able to squeeze quite a bit of timing in due to the octane versus the 91 octane he had. Runs real smooth with the Grimmspeed intake as the tuning with that is much easier than a lot of the intakes out there. |
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05-20-2015, 12:20 PM | #5 |
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Awesome. Last question: 2.5" or 3" Perrin?
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05-20-2015, 12:27 PM | #6 |
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2.5", 3" isn't necessary unless you're FI. All it will do is be louder, and more prone to scrape on things if you're lowered. I would stick with 2.5" all the way. The difference is very negligible between both and the trade offs for loud/possible drone aren't worth the slight horsepower gain you might see in the higher RPM's.
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05-20-2015, 01:20 PM | #7 | |
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The nameless header will probably give you a much better powerband, but will probably be a few hp lower at peak. Nothing against the JDL, but a 4-1 vs 4-2-1 will always come out this way.
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05-20-2015, 01:32 PM | #8 | |
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... but this depends on your local autocross course design. Some places like to put in courses with a lot of 2nd and 3rd gear changes. -alex |
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05-20-2015, 01:56 PM | #9 |
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National courses. So high second gear typically.
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05-20-2015, 02:32 PM | #10 |
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why are you adding in a catback, wont you just be running a track pipe? as long as you are below the sound limit it should be fine? maybe it was just the CS guys that can get away with that because of the extra cats?
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05-20-2015, 02:53 PM | #11 | |
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As far as power goes, I'm still in the process of e-tuning it, and I've never had the car on a dyno, so I don't know what kind of a difference you will see between the 2.5" and the 3" system. Might be some small gains higher in the rpm band. I bought this exhaust with STX in mind, but also wanted to have a free flowing exhaust in case I ever add a supercharger down the road. Obviously, the 3" system will weigh a little bit more than the 2.5" system, and as was previously stated, the 3" exhaust will be lower on the car, which means you may have to deal with more scraping if you are lowered. I'm not lowered yet, still on stock wheels and tires, and I have had zero issues scraping the exhaust so far. I think either way you go, you will really enjoy the sound quality and performance gains from this type of setup. Hope this helps you make a decision.
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05-20-2015, 04:11 PM | #12 |
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We run a car in STX out in San Diego and some regions have lower sound limits. SD's sound limit is 93db from 50 ft. On a NA setup even a 2.5 is the most I would really go as you are going to loose a lot down low with the lack of back pressure.
We have a ton of systems available, if you know which you would like shoot me a PM or give us a call for the best pricing out there. Cat-Back Systems Here is the Perrin Res System - PSP-EXT-360BR Cat Back Exhaust Resonated We have different header options as well. Header Choices Also Cats and MidPipes available Cats and Midpipes here "FT86Club" Promo code works on a lot of items on our website, if it doesn't on the system you are after contact me and I will update the pricing. |
05-20-2015, 06:43 PM | #13 |
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trippinbillies - check out ptuning's header. They got 200hp with header and a 3" exhaust (I think the 2.5" would be better) + a tune.
Just my opinion but I think EL is the way to go for high REV's. UEL I think is better for the torque dip (someone correct me if I'm wrong).
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05-20-2015, 09:55 PM | #14 |
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For STX out here, 4-2-1 all the way. Far too much time 4k+ where area under the curve is going to win out.
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The Following User Says Thank You to cjd For This Useful Post: | wparsons (05-21-2015) |
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