My GTM Supercharger Review

Staples · 12-29-2010, 01:08 AM

Quote:

Originally Posted by kevin1985912

I think it's because VQ37VHR has higher compression than the VQ35

Displacement and compression both play a factor in the VHR compared to the HR. HR has a 10.5:1 compression ratio, our motors are 11.0:1... We'll make more power on the same amount of boost.

Buddy Revell · 12-29-2010, 06:45 AM

Quote:

Originally Posted by kevin1985912

I think it's because VQ37VHR has higher compression than the VQ35

I didn't know the HR engine in the 07-08 Zs had strong enough internals to handle 14 psi even with the lower comp ratio. I had read the older DE engines in the 03-06 Zs w/ stock internals had trouble handling over 10 psi and they had even lower compression than the HR.

Staples · 12-29-2010, 01:05 AM

Quote:

Originally Posted by Buddy Revell

Whoa. A VQ35HR is strong enough to handle 14 psi?

I don't know from a supercharger standpoint, but I've seen a 350 with an HR put down 500whp and 430ft-lbs on 10psi with the Greddy 20G kit. He daily drives it at 8psi which hovers around 450-460whp.

They've really upgraded the bottom end in the 08 350z compared to the older DE non-rev and rev-up motors.

GTM ran a 14psi pulley on their test Nismo 350 on 100-oct and it put down 487whp and 365ft-lbs.

With a fairly conservative tune on 93 oct I'm sure it could be daily driven with no issues. It obviously wouldn't be 490whp, but I'm sure it would be fine at 450.

Mr.Squeeze · 12-29-2010, 11:26 PM

Quote:

Originally Posted by Buddy Revell

Whoa. A VQ35HR is strong enough to handle 14 psi?

The same 8PSI pulley on the VHR made 11PSI on the HR.

1slow370 · 12-30-2010, 06:09 AM

Quote:

Originally Posted by Mr.Squeeze

The same 8PSI pulley on the VHR made 11PSI on the HR.

this was thanks to poorer flow, smaller displacement, and less valve overlap(the HR's dual cvtc is tuneable)

theDreamer · 12-28-2010, 11:40 PM

Quote:

Originally Posted by RCZ

Other than getting LTH's to work, what's the purpose / expected gains? I heard there wasn't much at all to be gained from fiddling with the system since it already does a pretty damn good job from the factory. Don't get me wrong, I'd be all for running LTH's.

VVEL does not have much to do with LTHs.
It is more on the side of cams and such, it will help those with more open exhaust setups probably but maybe not. Right now they are going to use the FCON by HKS to test tuning with VVEL.

Lug · 12-29-2010, 10:11 PM

Found it....

Rods
HR, VHR, DE

djpathfinder · 12-29-2010, 11:36 PM

The HR and VHR rods look very similar.

12-29-2010, 10:11 PM	#7 (permalink)
Lug A True Z Fanatic Join Date: Dec 2008 Location: Texas Posts: 1,926 Drives: 2006 350Z Rep Power: 20	Found it.... Rods HR, VHR, DE __________________ keep Chubbs in your pocket - Chubbs

12-29-2010, 11:36 PM	#8 (permalink)
djpathfinder A True Z Fanatic Join Date: Mar 2010 Location: Edmonton, Canada Posts: 12,910 Drives: 2012 GT-R BE Rep Power: 734	The HR and VHR rods look very similar. __________________ 2012 GT-R Black Edition Jet Black 2010 370Z 40th Anniversary // SOLD

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