How much boost pressure can a built VQ37VHR withstand?

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.