How much boost pressure can a built VQ37VHR withstand?

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.

G37Sam · 08-11-2014, 02:04 AM

One of the reasons people build their engines is to drop compression to a decent enough level for boost. The OEM compression ratio is too high for pump fuel.

You also need to keep in mind that traction is a major issue on our cars, and the increased torque makes breaking parts in your drivetrain much easier. If you're building a dyno queen you'll be fine but anything you plan to race requires serious consideration in terms of traction and strength.

Nuc370z · 08-11-2014, 09:55 AM

Quote:

Originally Posted by G37Sam

One of the reasons people build their engines is to drop compression to a decent enough level for boost. The OEM compression ratio is too high for pump fuel.

You also need to keep in mind that traction is a major issue on our cars, and the increased torque makes breaking parts in your drivetrain much easier. If you're building a dyno queen you'll be fine but anything you plan to race requires serious consideration in terms of traction and strength.

What would you recommend upgrading for the drivetrain? Eg. Clutch (which brand is best suited for high torque spikes), driveshaft, differential (I plan on an OS giken, but any suggestions?), gearbox, etc.

Thanks!

KratikosG37 · 11-04-2014, 11:44 AM

Quote:

Originally Posted by G37Sam

One of the reasons people build their engines is to drop compression to a decent enough level for boost. The OEM compression ratio is too high for pump fuel.

You also need to keep in mind that traction is a major issue on our cars, and the increased torque makes breaking parts in your drivetrain much easier. If you're building a dyno queen you'll be fine but anything you plan to race requires serious consideration in terms of traction and strength.

Agreed. After reading this thread, they're no reason for 600+whp for street use.

12 PSI tune on OEM engine is a protenial low 11's 1/4 mile car all day long.

IMO i'm happy with 8 PSI with 450ishwhp. Can do a John Force in 3 gears, or 1.6 60ft with good tires(and great driver).

Just don't see the point in building a engine other then appying some where other then the street. (Not implying street racing for $$$ just normal use fyi)

1slow370 · 11-04-2014, 12:24 PM

Quote:

Originally Posted by KratikosG37

Agreed. After reading this thread, they're no reason for 600+whp for street use.

12 PSI tune on OEM engine is a protenial low 11's 1/4 mile car all day long.

IMO i'm happy with 8 PSI with 480whp. Can do a John Force in 3 gears, or 1.6 60ft with good tires(and great driver).

Just don't see the point in building a engine other then appying some where other then the street. (Not implying street racing for $$$ just normal use fyi)

Yup I have 370whp and I'm running out of traction need to get better tires. 500+ whp is pretty useless on these cars unless you want to go a bazillion mph.

megalapagas · 08-11-2014, 12:12 PM

But see he's a 7AT, where are you going ro get the valvebody to help your tanny hold all that torque??? As far as I've read through here our 7At tranny can only hold up to 400 torque and that's pushing it if it was on a good tune? Unless I missed something please elaborate as I too plan on going boosted...Btw between ID's and Bosch injectors whoch would you go with and what about Deatschwerks??? I plan on going with 1000cc for E85..

Rid3_FaM0uS · 08-11-2014, 12:49 PM

Quote:

Originally Posted by megalapagas

But see he's a 7AT, where are you going ro get the valvebody to help your tanny hold all that torque??? As far as I've read through here our 7At tranny can only hold up to 400 torque and that's pushing it if it was on a good tune? Unless I missed something please elaborate as I too plan on going boosted...Btw between ID's and Bosch injectors whoch would you go with and what about Deatschwerks??? I plan on going with 1000cc for E85..

Bosch is who designs the cartridge for both Injector Dynamics and Fuel Injector Clinic. IIRC each company only merely designs their own spray nozzle if I were you I would go with one of the two. They are top dogs in the injector market ID being flow balanced to 1-2% and FICs being balanced to no more than 3%.

Mitco39 · 08-11-2014, 12:37 PM

I am running 13PSI peak (settles in around 12.5 under most scenarios). I had to upgrade to the CJM return fuel system to be able to support fueling at that boost (the stock system would drop ~15psi under boost). Car has been running great. Nissan did right with these engines in my book.

bullitt5897 · 10-31-2014, 09:00 AM

My Built 4.5L has already seen 30+ PSI... Then again my motor costs more than a new Z...

37winner · 11-01-2014, 12:04 PM

Quote:

Originally Posted by bullitt5897

My Built 4.5L has already seen 30+ PSI... Then again my motor costs more than a new Z...

Since your talking about it. How much boost have you pushed?

bullitt5897 · 10-31-2014, 09:05 AM

The Stock intake manifold is going to start to be questionable around 800rwhp... Also boost is going to be relative to each build the turbos on the build and supporting mods.

However, if you are comparing block to block I know the regular built GTM Motors and ones built by Speed 4 Sale have handled deep into the 20+ psi range.

If you go with one of the more built motors like mine then you will need to be looking at other supporting mods to truly take full advantage of their capabilities. for example I run a GTR intake Manifold, I have built Heads and etc...

Nissan370 · 10-31-2014, 10:06 AM

yea you have to know what you want out of your car
track car
drag car
drift car
street car

For me its all about the street car life and 600-700rwhp will have me killing most cars i come across on the street

i do the drag strip maybe 3times a year and this car is my summer car so that hp level will work great for me.

small example last weekend i pulled on a 2013 gtr in 4th gear having him only jump pass me as i shifted into 5th gear (paddle shift wtw)

08-11-2014, 02:04 AM	#5 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 21	One of the reasons people build their engines is to drop compression to a decent enough level for boost. The OEM compression ratio is too high for pump fuel. You also need to keep in mind that traction is a major issue on our cars, and the increased torque makes breaking parts in your drivetrain much easier. If you're building a dyno queen you'll be fine but anything you plan to race requires serious consideration in terms of traction and strength. __________________ '14 Viper GTS '08 RB'd G37S - Sold

08-11-2014, 12:12 PM	#9 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 13	But see he's a 7AT, where are you going ro get the valvebody to help your tanny hold all that torque??? As far as I've read through here our 7At tranny can only hold up to 400 torque and that's pushing it if it was on a good tune? Unless I missed something please elaborate as I too plan on going boosted...Btw between ID's and Bosch injectors whoch would you go with and what about Deatschwerks??? I plan on going with 1000cc for E85.. __________________ GTM 34 Row Oil Cooler \| K&N Drop Ins w/ Z1's Post MAF Tubes \| F.I Non-Res'd 2.5" T.P w/ CF CBE \| Axis Wheels \| Piecing together My Own Custom T4 Top Mount Single Turbo Kit Still in the works \| Last edited by megalapagas; 08-11-2014 at 12:16 PM.

08-11-2014, 12:37 PM	#11 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 133	I am running 13PSI peak (settles in around 12.5 under most scenarios). I had to upgrade to the CJM return fuel system to be able to support fueling at that boost (the stock system would drop ~15psi under boost). Car has been running great. Nissan did right with these engines in my book. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

10-31-2014, 09:00 AM	#12 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	My Built 4.5L has already seen 30+ PSI... Then again my motor costs more than a new Z... __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

10-31-2014, 09:05 AM	#14 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	The Stock intake manifold is going to start to be questionable around 800rwhp... Also boost is going to be relative to each build the turbos on the build and supporting mods. However, if you are comparing block to block I know the regular built GTM Motors and ones built by Speed 4 Sale have handled deep into the 20+ psi range. If you go with one of the more built motors like mine then you will need to be looking at other supporting mods to truly take full advantage of their capabilities. for example I run a GTR intake Manifold, I have built Heads and etc... __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

10-31-2014, 06:53 AM	#2 (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?

10-31-2014, 10:06 AM	#15 (permalink)
Nissan370 Enthusiast Member Join Date: Feb 2011 Location: Baltimore Posts: 431 Drives: 2009 ST BLK 370Z Rep Power: 15	yea you have to know what you want out of your car track car drag car drift car street car For me its all about the street car life and 600-700rwhp will have me killing most cars i come across on the street i do the drag strip maybe 3times a year and this car is my summer car so that hp level will work great for me. small example last weekend i pulled on a 2013 gtr in 4th gear having him only jump pass me as i shifted into 5th gear (paddle shift wtw) Merv likes this. __________________ 370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)

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