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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-17-2014, 05:34 PM   #15
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Originally Posted by ramiram1984 View Post
With his uel header, you see it made more torque down low and did better job in dip area...
This is still impressive. Why did I spend LOTS of $$?
Lol
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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Old 01-17-2014, 06:02 PM   #16
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Stock header should be of thicker sidewalling than an aftermarket one.
Also the stock stuff has a slightly smaller ID than the aftermarket parts... larger dia = more volume.
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Old 01-17-2014, 07:12 PM   #17
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Also the stock stuff has a slightly smaller ID than the aftermarket parts... larger dia = more volume.
True dat. But honestly it's not that much smaller. Power feels great for smaller parts.
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Old 01-17-2014, 07:32 PM   #18
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Some people prefer smaller parts
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Old 01-23-2014, 06:22 AM   #19
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https://www.facebook.com/photo.php?v=10201443074615894

sound clip
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Old 01-23-2014, 07:21 AM   #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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Old 01-24-2014, 06:15 AM   #21
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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.
boost is dependent on pulley size. Charger ftw.
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Old 01-24-2014, 09:18 AM   #22
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boost is dependent on pulley size. Charger ftw.
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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Old 01-24-2014, 09:27 AM   #23
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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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Old 01-24-2014, 06:53 PM   #24
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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.
Are you for real? You do understand the innovate supercharger is a intake manifold replacement twinscrew charger right? If you removed the charger the car wouldn't start. The charger is dependent on pulley size for boost. You can't just make it magically generate more or less boost w.o altering the pulley size.

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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Old 01-24-2014, 09:53 PM   #25
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Are you for real? You do understand the innovate supercharger is a intake manifold replacement twinscrew charger right? If you removed the charger the car wouldn't start. The charger is dependent on pulley size for boost. You can't just make it magically generate more or less boost w.o altering the pulley size.

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.
I don't think we are on the same anything... Page/wavelength/physics.

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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Old 01-24-2014, 10:31 PM   #26
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I don't think we are on the same anything... Page/wavelength/physics.

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.
You fail to see what i'm saying.

Quote:
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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.
boost is dependent on pulley size. Charger ftw.

Quote:
Originally Posted by industrial View Post
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.
It is as simple as installing a smaller pulley to create more boost? Maybe I should have been more clear. Science is fact. The smaller the pulley the faster the charger spins = more air being compressed = more boost.

I'm not disagreeing with you. Lol.
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Old 01-24-2014, 11:11 PM   #27
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how did you gut the stock header?
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Old 01-25-2014, 04:48 AM   #28
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Quote:
Originally Posted by NickFRS View Post
boost is dependent on pulley size.
True, but given the same pulley size, breathing mods will marginally reduce boost pressure because more gas escapes the combustion chamber.

How does the drone compare to the previous setup?

Thanks for posting your results.
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