GT Motorsports: 370Z Supercharger system development

Buddy Revell · 03-01-2010, 06:23 AM

In case people somehow miss the press release thread, lol:
GTM Performance Engineering 370Z SUPERCHARGER KIT PRESS RELEASE

Phimosis · 03-01-2010, 04:19 PM

I'm in awe of the dyno numbers. That far exceeds my expectations for a s/c kit, especially with regards to low rpm performance of the centrifugal design charger.

The part that I am confused about is how do they get more power from a smaller displacment engine than the VR38DETT with less boost and using a supercharger vs turbo? At 420 rwhp that is roughly 500 hp at engine with 8psi boost, where the VR38DETT is 480 hp with 10.5 psi boost.

racerxj17 · 03-01-2010, 04:21 PM

Quote:

Originally Posted by Phimosis

I'm in awe of the dyno numbers. That far exceeds my expectations for a s/c kit, especially with regards to low rpm performance of the centrifugal design charger.

The part that I am confused about is how do they get more power from a smaller displacment engine than the VR38DETT with less boost and using a supercharger vs turbo? At 420 rwhp that is roughly 500 hp at engine with 8psi boost, where the VR38DETT is 480 hp with 10.5 psi boost.

post up the compression ratio of the two engines....

jmlenz · 03-01-2010, 07:43 PM

Quote:

Originally Posted by Phimosis

I'm in awe of the dyno numbers. That far exceeds my expectations for a s/c kit, especially with regards to low rpm performance of the centrifugal design charger.

The part that I am confused about is how do they get more power from a smaller displacment engine than the VR38DETT with less boost and using a supercharger vs turbo? At 420 rwhp that is roughly 500 hp at engine with 8psi boost, where the VR38DETT is 480 hp with 10.5 psi boost.

I believe the VR38 has been vastly under rated from the factory as well. Thought I read somewhere the true bhp, based on AWD dyno pulls is in the 550 range?

stormcrow · 03-01-2010, 07:50 PM

Quote:

Originally Posted by jmlenz

I believe the VR38 has been vastly under rated from the factory as well. Thought I read somewhere the true bhp, based on AWD dyno pulls is in the 550 range?

Actually, the VR38DETT was rated properly from the factory. Depending upon what day/dyno you are on, you will net anywhere from 390 to 420awhp. Given the fact that drive-train loss is not a singlular calculable number, there is no real way to measure flywheel hp without an engine dyno. But, best guess numbers were around 480-490 crank horsepower.

The tune and restrictive stock exhaust is what caused the differences in power. Keep in mind that the GT-R has four cats. Two as "down-pipes" and two in the mid-pipe. Very restrictive. Timing in the factory tune was pansy, as well. Merely adding a mid-pipe sans cats and changing the timing would net 30-40awhp. Up the boost three psi and you were looking at nearly +80.

Gmendez · 07-27-2010, 01:20 PM

Sam, I have not seen anyone ask about the clutch/PP holding up to the various stages. In your opinion, is there any need to upgrade for any of the stages?

Also, what do you anticipate (from a hardware perspective) the changes to be from stage to stage?

Thanks!

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03-01-2010, 06:23 AM	#1 (permalink)
Buddy Revell Enthusiast Member Join Date: Mar 2009 Location: So Cal Posts: 303 Drives: 08 Infiniti G37 Rep Power: 18	In case people somehow miss the press release thread, lol: GTM Performance Engineering 370Z SUPERCHARGER KIT PRESS RELEASE

03-01-2010, 04:19 PM	#2 (permalink)
Phimosis Enthusiast Member Join Date: May 2009 Location: Oildale, CA Posts: 412 Drives: 2013 911 4S Rep Power: 418	I'm in awe of the dyno numbers. That far exceeds my expectations for a s/c kit, especially with regards to low rpm performance of the centrifugal design charger. The part that I am confused about is how do they get more power from a smaller displacment engine than the VR38DETT with less boost and using a supercharger vs turbo? At 420 rwhp that is roughly 500 hp at engine with 8psi boost, where the VR38DETT is 480 hp with 10.5 psi boost.

07-27-2010, 01:20 PM	#6 (permalink)
Gmendez Base Member Join Date: Mar 2010 Location: Miami, FL Posts: 114 Drives: '10 PW 370Z NISMO Rep Power: 17	Sam, I have not seen anyone ask about the clutch/PP holding up to the various stages. In your opinion, is there any need to upgrade for any of the stages? Also, what do you anticipate (from a hardware perspective) the changes to be from stage to stage? Thanks!