So im in the last phase of my turbo build, for now, which is tuning the car. I would like to know what amount of PSI is safe to run on this motors(stock internals). Would you limit the tuning to PSI or power. Meaning would you tune it up to certain amount of PSI or would you tune it up to a certain amount of hp/ft lbs? A little background. Im running the Turbo Specialties turbo kit with a Garrett GT35, 3" turboback exhaust 440CC injectors. More info about the build can be find here.

http://forums.maxima.org/members-rid...-progress.html

 

Wow man. I'm surprised your engine is still running the way you are ragging on it untuned. You took it up to 10 psi with stock injectors and hot plugs with no wideband or tuning unit. Is the wideband installed? Did you install the correct injectors yet? With the wideband you can get a friend to help you put a basic street tune on it, but to get the most out of the car it needs to be tuned on the dyno. I would go with a 5lb spring. In your climate another novelty for the build would be a water/meth injection kit.

 

Thanks for the reply, but you didnt answer my question. The car is going to be dynotuned. Im just wondering whats the engine's limit, based on other people' experiences with similar setups. Do you guys stop at a certain level of PSI or at a certain power level. Whats the most PSI a VQ30DEK will handle with stock internals?

 

The tuner will determine the limit by the parameters he monitors. They will tune it according to how much fuel it can supply via afr, monitor injector duty cycle and boost pressure. They should also be monitoring knock. The car should make good power but the tuner should know what he is doing so the tuner actually determines when to stop. If you look at the dyno link in this forum you will see similar setups and the potential power put out by a dek.

 

I wouldn't exceeds 15psi or whenever point when you increase the boost and all you really get is more tq and no hp.

Most people stay in the 6-10psi range but for example the last people to dyno that kit only made like 256 or 260hp and around 280tq at 9psi

 

you didn't search.

 

Thats what I was looking for.

Thats what I was wanting to know, no more than 15. I really dont care how low the boost is aslong as it makes decent power while maintaining some reliability(dont wanna blow the motor the first time i punch it). I expect better number than that, based on the upgrades I have made to the kit. I'll keep y'all posted

 

ringlands and headgaskets tend to crack/blow around 15psi depending on the tune and your right foot. Also I would suggest staying under 400tq

But there are so many other factors like exhaust, dp, fp,timing curve, spooling