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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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#15 |
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Vid will be up later tonight. My tunner actually reduced the timing under 3.5k RPMs so there wold be less knock. Look at the top end though. With the last set up the car was loosing power at 7k. Now it holds HP strong till redline.
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#16 |
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Also the stock stuff has a slightly smaller ID than the aftermarket parts... larger dia = more volume.
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#18 |
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Some people prefer smaller parts
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#20 |
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This probably is the case here since you can't easily turn up the boost to compensate for reduced back pressure or increased scavenging from a free flowing exhaust.
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boost is dependent on pulley size. Charger ftw.
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#22 |
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Not really that simple. If you unbolted your supercharger from the engine and just ran it into open air it would generate 0 boost. Likewise, changes to engine VE like reducing back pressure or improving scavenging will decrease boost pressure since a non-waste gated supercharge just pushes a fixed cfm.
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1 pull in July, 1 pull in January. In Portland, right? What is that, 30-35 degrees F difference in temp and a huge change in atmospheric moisture (humidity)?
I'd honestly like to see what they look like with weather correction. Good to see, but let's not start making conclusions just yet... |
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![]() If you put a more free flowing exhaust or intake all you will be doing is changing the AFR's. In which case you can pull more power. Adding an exhaust to a charger doesn't make it generate more boost. Twinscrews work way differently then turbo's.
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#25 | |
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![]() Reread what I'm saying. If you open up the exhaust on a non-wastegated/clutched supercharger system like the innovate, you will LOSE psi but gain VE. That maybe why it seems like exhaust mods aren't worthwhile on these systems. You may have to add a smaller pulley to make up for the lost boost. I will not respond again here...I know where science isn't wanted. |
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I'm not disagreeing with you. Lol.
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how did you gut the stock header?
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