Quote Originally Posted by truckinL33 View Post
It's strange that the engine would experience knock if his tune has a couple degrees pulled out for N2O, especially if he is running 93 octane fuel. I would probably start by checking fuel pressure at a 1/4 tank, and then check it with a full tank. See if there is a diff. there.
Way ahead of you, I stopped and bought a fuel pressure kit this morning and going to check it tomorrow while I am off. What is optimal pressure for a stock fuel pump? Playing devil's advocate, what do you think would be the problem(s) for findings in either direction, good pressure all the way around, or, good pressure at full, low pressure at 1/4?