I have been reading a little bit, and was wondering why it is that other car's such as supras can have their boost turned up to 32psi on race gas, and 18 on pump gas, yet the highest boost ive seen on a 350z is 8psi, is the engine just not strong enough to handle the boost or what?

 

Your little bit a reading needs to take place on the other side of the search button. The Z is a naturally aspirated motor. The Supra is built for boost from the factory. Search the rest.

 

Yes, factory turbocharged car will come with much lower compression engine than a factory NA engine. Lower compression = higher boost.