GT Motorsports: 370Z Supercharger system development

RCZ

Could you point me to where you saw that thread Silo? I'd like to read more on the subject.

If it is a matter of intake charge density and backpressure, then that makes sense. I'm glad I learned something today. So there must be a sweet spot for volumetric efficiency that will squeeze the absolute most out of a turbo.

KEVTEX

The quantity of air that flows through the engine at a given boost pressure, temperature and rpm is detemined by the flow characteristics of the engine(port size, valve size, cam, displacement) and not by the characteristics of the compressor that creates the boost. Other than minor differences in parasitic losses from bearings and belts, boost is boost regardless of how the engine created it.
Silo's chart indicated a larger turbo could flow more air than a small turbo at a given pressure, which is not true if they were both used on identical engines. It would be true if the larger turbo was used on a larger engine.

modme

I would think the intake piping would have more influence on how much power the engine makes at a given psi. A 3 inch pipe supplying 5 psi to the engine would result in more power than say a 1/2 inch pipe supplying 5 psi.

kdoske

This is why I love super chargers. Everyone wants a turbo with 500+ power. Thats great and all but unless your a track junkie all that highend HP is wasted and not utilized. These power curves will create a more fun daily driver then any high HP turbo setup.

Crash

Not bad... 360+RWHP is C5 Z06 territory. Not bad at all.

8PSI would probably get you over 400RW. But even at 5PSI you've got a pretty fast car.

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

KEVTEX

Intake piping size will affect efficiency. 5psi at the intake manifold will produce the same power when delivered through a 1/2 inch pipe as it would with a three inch pipe. The system using the 1/2 inch pipe would waste a lot of the power produced in forcing enough air through the pipe to yield 5psi at the manifold. Pressure inside the 1/2 inch pipe would be about 36 times higher than the pressure in the 3 inch pipe to deliver the same 5psi at the manifold.

JB-370z

Sounds like someone did not forget what they learned in physics.

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ll Baker Tuning ll GTM ll Powerhouse Amuse ll HKS ll Up-Rev ll iForged ll AP Racing ll Pioneer ll SPL ll Bride ll Top Secret ll OS Giken ll
GTM Stage 2 Twin Turboed 370z (First in Texas, Thanks To Baker Tuning)

budakai

Can someone help me read this tq curve.

budakai

How do I read this dyno sheet.

Togo

HP rating on the left side.. TQ rating on the right side


The line that rises from low to high is the HP

The flatter line is the TQ

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This will decimate all after you put about fifteen grand in it or more, and if we have to, overnight parts from Japan.

Joe Clem and Koeppel Nissan

budakai

So what's the Tq curve? And what makes it a good thing? Thanks for the response

Togo

The TQ curve is how the TQ is applied to the wheels.. is it smooth, does it spike, is it harsh, etc..

Thats the TQ curve or measurement

Attached Images

Picture 1.png (65.8 KB, 102 views)

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This will decimate all after you put about fifteen grand in it or more, and if we have to, overnight parts from Japan.

Joe Clem and Koeppel Nissan

Togo

A better shot of before and after.. so a noticeable gain in TQ from start to finish. It's flat so that makes it predictable, smooooooth.

Attached Images

Picture 2.png (71.3 KB, 99 views)

__________________
This will decimate all after you put about fifteen grand in it or more, and if we have to, overnight parts from Japan.

Joe Clem and Koeppel Nissan

budakai

oh oh ok...Thanks I get it now...Do you notice the wave in there...I wonder what caused that.

kdoske

prolly this guy....