2008 G37 Sport Coupe Max HP on Stock Trans

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Stratos
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Joined: Mon Mar 01, 2021 9:06 am
Car: 2008 Infiniti G37 Sport Coupe RWD 6Spd M/T

2008 G37 Sport Coupe Max HP on Stock Trans

Postby Stratos » Tue Mar 02, 2021 8:18 am

So I know that someone has probably asked this question but what is the max HP a 08 G37 Sport Coupe, RWD, 6 speed manual, can hold with stock trans and nothing too crazy with engine modification besides getting it up to said HP


HollywoodJackson
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Car: 2002 Infiniti Q45 Premium (daily)
1990 Nissan 240SX (drift)
1999 Infiniti Q45 (RIP)
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Re: 2008 G37 Sport Coupe Max HP on Stock Trans

Postby HollywoodJackson » Tue Apr 27, 2021 2:34 pm

I'm far from an expert. That said, I've heard the gearbox should be gucci up to around 1,200 HP. It's become a pretty desirable gearbox for manual swaps across lots of chassis partly due to its availability, and its HP tolerance.

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PalmerWMD
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Car: 2004 350Z

Re: 2008 G37 Sport Coupe Max HP on Stock Trans

Postby PalmerWMD » Tue Apr 27, 2021 4:55 pm

From 400 whp you need an upgraded clutch.
I had the same transmission in a 350Z.
Clutch held fine but started to slip after I got to 400 whp.

HollywoodJackson
Posts: 252
Joined: Thu Oct 23, 2014 1:35 pm
Car: 2002 Infiniti Q45 Premium (daily)
1990 Nissan 240SX (drift)
1999 Infiniti Q45 (RIP)
Location: Hollywood, CA
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Re: 2008 G37 Sport Coupe Max HP on Stock Trans

Postby HollywoodJackson » Tue Apr 27, 2021 7:06 pm

PalmerWMD wrote:
Tue Apr 27, 2021 4:55 pm
Clutch held fine but started to slip after I got to 400 whp.
Dope! Thanks for that input.

What mods did you do to get to/over 400 HP, if you don't mind me asking? I have a G35 manual now. I plan to get a used engine from PickAPart, and rebuild it. I would like to build it stronger, then add boost. Probably twin turbo. The only thing I am thinking about adding to the new(er) engine is the G37 HR valve springs which I hear will support higher revving.

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PalmerWMD
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Car: 2004 350Z

Re: 2008 G37 Sport Coupe Max HP on Stock Trans

Postby PalmerWMD » Fri Oct 22, 2021 8:05 pm

HollywoodJackson wrote:
Tue Apr 27, 2021 7:06 pm
PalmerWMD wrote:
Tue Apr 27, 2021 4:55 pm
Clutch held fine but started to slip after I got to 400 whp.
Dope! Thanks for that input.

What mods did you do to get to/over 400 HP, if you don't mind me asking? I have a G35 manual now. I plan to get a used engine from PickAPart, and rebuild it. I would like to build it stronger, then add boost. Probably twin turbo. The only thing I am thinking about adding to the new(er) engine is the G37 HR valve springs which I hear will support higher revving.
Sorry I didnt respond more timely.
I had a Vortech Supercharger, plus AAM hiflow cats, and of course a uprev retune on the dyno.

Did not bother with intake or catback.
The mild pulley gave me 370-380 whp and the smaller puller gave me 411whp.

With the smaller pulley I could tell my clutch was past its capability but it held up fine with the milder pulley.
Later got a Nismo clutch and all was well even at 411whp (which I figure was probably 470-475 crank hp )

I staid with the stock fuel system and started running out of fuel at higher rpms so brought down the redline with the uprev for engine safety.


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