My GTM Supercharger Review

Buddy Revell · 12-29-2010, 01:49 AM

Quote:

Originally Posted by Staples

That's why you see the same stage 1 kit on the 350z HR putting down 470+whp on 14psi, the same exact kit that's available to the VHR motor that is only seeing 8psi (same pulley being used between both motors)

This is what my input is at least on the matter, I'm sure Sam could shed a lot more light on this then I can.

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

kevin1985912 · 12-29-2010, 01:59 AM

Quote:

Originally Posted by Buddy Revell

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

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

Staples · 12-29-2010, 02:05 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.

Staples · 12-29-2010, 02:08 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, 07:45 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.

1slow370 · 12-29-2010, 10:20 AM

rods in the hr are pretty much the same as ours, pretty much everything is actually the same in the shortblock for the most part our stroke is just a we bit bigger.

Staples · 12-29-2010, 10:49 PM

Quote:

Originally Posted by 1slow370

rods in the hr are pretty much the same as ours, pretty much everything is actually the same in the shortblock for the most part our stroke is just a we bit bigger.

It seems they changed a few things for the better.

Lug · 12-29-2010, 11:11 PM

Found it....

Rods
HR, VHR, DE

Mr.Squeeze · 12-30-2010, 12:26 AM

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.

djpathfinder · 12-30-2010, 12:36 AM

The HR and VHR rods look very similar.

1slow370 · 12-30-2010, 07:09 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)

Mr.Squeeze · 12-31-2010, 06:33 AM

Quote:

Originally Posted by 1slow370

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

I am aware of this and is the reason I posted it VVEL is the problem

12-29-2010, 10:20 AM	#66 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	rods in the hr are pretty much the same as ours, pretty much everything is actually the same in the shortblock for the most part our stroke is just a we bit bigger. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

12-29-2010, 11:11 PM	#68 (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

12-30-2010, 12:36 AM	#70 (permalink)
djpathfinder A True Z Fanatic Join Date: Mar 2010 Location: Edmonton, Canada Posts: 12,910 Drives: 2012 GT-R BE Rep Power: 733	The HR and VHR rods look very similar. __________________ 2012 GT-R Black Edition Jet Black 2010 370Z 40th Anniversary // SOLD

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