GT Motorsports: 370Z Supercharger system development

Solus · 02-19-2010, 08:46 AM

Quote:

Originally Posted by Silo

Having said that, a birdy told me there will be a press release later today...

O.o

KEVTEX · 02-18-2010, 03:34 PM

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.

BalanBro · 02-18-2010, 08:59 PM

Quote:

Originally Posted by 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.

Bingo! There you go, this guy speaks the truth. The boost pressure you are seeing is measured at the intake manifold. It doesn't matter if it got their through a turbo or supercharger, nor if it was through 10" piping or a 1" garden hose. Two completely different FI setup's with equal manifold pressure and temperature (assming they are both effectively intercooled) will yield the same engine output. If it didn't, it would violate the laws of thermodynamics.

What happens most often in the case of a turbo that is too small for its application is that it reaches a point that it can't maintain sufficient cfm for a given engine rpm, and the measured manifold boost pressure will drop accordingly. I know several folks have experienced this with small gt25's on their sr20det's.

modme · 02-18-2010, 04:03 PM

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.

Crash · 02-18-2010, 05:01 PM

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.

KEVTEX · 02-18-2010, 05:16 PM

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 · 02-18-2010, 06:35 PM

Quote:

Originally Posted by 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.

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

budakai · 02-18-2010, 07:04 PM

Can someone help me read this tq curve.

Togo · 02-18-2010, 07:10 PM

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

budakai · 02-18-2010, 07:14 PM

Quote:

Originally Posted by 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

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

Togo · 02-18-2010, 07:16 PM

Quote:

Originally Posted by budakai

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

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

budakai · 02-18-2010, 07:18 PM

Quote:

Originally Posted by 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

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

kdoske · 02-18-2010, 07:20 PM

Quote:

Originally Posted by budakai

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

prolly this guy....

Togo · 02-18-2010, 07:21 PM

Quote:

Originally Posted by budakai

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

That I really wouldn't know anything about but maybe someone else in this thread might be able to answer what might cause that

Togo · 02-18-2010, 07:18 PM

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.

02-18-2010, 05:01 PM	#5 (permalink)
Crash A True Z Fanatic Join Date: Dec 2008 Location: Los Angeles Posts: 1,853 Drives: 02 Corvette Z06 Rep Power: 591	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. __________________ 2002 Corvette Z06 - Totaled 2003 Corvette Z06 50th Anniversary

02-18-2010, 07:10 PM	#9 (permalink)
Togo A True Z Fanatic Join Date: May 2009 Location: E. Northport, NY Posts: 7,597 Drives: Stuff Rep Power: 659	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 __________________ 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

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02-18-2010, 03:34 PM	#2 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 17	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.

02-18-2010, 04:03 PM	#4 (permalink)
modme Enthusiast Member Join Date: Mar 2009 Location: NY Posts: 345 Drives: G37 Rep Power: 18	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.

02-18-2010, 05:16 PM	#6 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 17	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.

02-18-2010, 07:04 PM	#8 (permalink)
budakai Base Member Join Date: May 2009 Location: PA Posts: 57 Drives: g37 Rep Power: 18	Can someone help me read this tq curve.