How much boost pressure can a built VQ37VHR withstand?

phunk · 08-09-2014, 02:45 PM

85ft lbs should be good to go. Perhaps they raised the torque specs or changed material of their standard studs to allow more torque? Because I am pretty sure that the stud threads and length and everything are the same as the DE arent they? Its been many years, its just burned into my brain that all the 2003-2004 DE builds were blowing headgaskets with the normal ones and then it became a non-issue when we all went to 1/2" threads.

Wattles · 08-11-2014, 01:43 AM

My built engine was a big investment, but siting at nearly 600whp at 13lbs boost on 91 octagon fuel is very nice. It makes me comfortable I can beat on the engine on hot hot days without worry.
When I upgrade my fuel system to deal with any starvation I will push her higher to 18ish. 650-700whp should be fun.

Rid3_FaM0uS · 08-11-2014, 12:52 PM

Quote:

Originally Posted by phunk

85ft lbs should be good to go. Perhaps they raised the torque specs or changed material of their standard studs to allow more torque? Because I am pretty sure that the stud threads and length and everything are the same as the DE arent they? Its been many years, its just burned into my brain that all the 2003-2004 DE builds were blowing headgaskets with the normal ones and then it became a non-issue when we all went to 1/2" threads.

Charles. I still haven't had time to measure the studs to get you an answer sorry but I do believe they changed to their ARP 2000 grade material for the studs so that could be where the much higher allowable torque specs are coming from. both my mains and heads were torqued 3 equal stages @ 85

Diabel · 10-31-2014, 06:53 AM

So, getting back to topic - how much boost pressure can a built VQ37VHR withstand?

16,17 psi ?

Mine block is 9.0:1, arps l19, without e85 or water/meth injection.

Isn't the stock intake plenum the max limiter of boost we can go with?

Chuck33079 · 10-31-2014, 07:07 AM

Quote:

Originally Posted by Diabel

So, getting back to topic - how much boost pressure can a built VQ37VHR withstand?

16,17 psi ?

Mine block is 9.0:1, arps l19, without e85 or water/meth injection.

Isn't the stock intake plenum the max limiter of boost we can go with?

That's not a question that can be answered without a lot more info. 25 psi out of a tiny turbo is a lot less air than 25 psi out of a large one. The motor may hold up fine with 15 psi out of a gt28 and explode at 15 psi out of a gt42.

jwick · 10-31-2014, 07:09 AM

Quote:

Originally Posted by Diabel

So, getting back to topic - how much boost pressure can a built VQ37VHR withstand?

16,17 psi ?

Mine block is 9.0:1, arps l19, without e85 or water/meth injection.

Isn't the stock intake plenum the max limiter of boost we can go with?

It's all R&D at this point. No one knows. **** none of us actually know where the stock block limits are yet.

08-09-2014, 02:45 PM	#1 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,669 Drives: 370 Rep Power: 974724	85ft lbs should be good to go. Perhaps they raised the torque specs or changed material of their standard studs to allow more torque? Because I am pretty sure that the stud threads and length and everything are the same as the DE arent they? Its been many years, its just burned into my brain that all the 2003-2004 DE builds were blowing headgaskets with the normal ones and then it became a non-issue when we all went to 1/2" threads. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

08-11-2014, 01:43 AM	#2 (permalink)
Wattles Base Member Join Date: Jul 2012 Location: California Posts: 57 Drives: 2012 G37 IPL 7AT TT Rep Power: 13	My built engine was a big investment, but siting at nearly 600whp at 13lbs boost on 91 octagon fuel is very nice. It makes me comfortable I can beat on the engine on hot hot days without worry. When I upgrade my fuel system to deal with any starvation I will push her higher to 18ish. 650-700whp should be fun. __________________ 2012 G37 IPL 7AT \| GTM Stage 1 Long Block \| GTM Stage 1 Garett TT \| Blitz SBC typeR Boost Controller \| GTM Stage 4 Transmission \| Tial BOV \| Fast Intentions exhaust \| GTM 8qt Oil Pan \| 583whp/484trq @ 13psi

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10-31-2014, 06:53 AM	#4 (permalink)
Diabel Base Member Join Date: Sep 2012 Location: Bensenville IL Posts: 103 Drives: 370z Rep Power: 13	So, getting back to topic - how much boost pressure can a built VQ37VHR withstand? 16,17 psi ? Mine block is 9.0:1, arps l19, without e85 or water/meth injection. Isn't the stock intake plenum the max limiter of boost we can go with?