i want to know what is the most psi people have run on there stock motors. Post HERE

 

Psi really means nothing on how long the motor will last, its the amount of horsepower that strains the motor. 5 psi on a gt35r is alot more power than a little 14g turbo. To answre your question though, i'm making 333 whp on stock motor @ 15psi. It runs real good with no problems. With a good tune and reliable setup you can make anywhere from 300-350 safely.

 

with a .57 trim t3/t4 I ran 12 psi without any problems. Ive seen has high as 24 with the same turbo on a stock b18b.