On Corbin's page it says .525 because of the design of our engine. I know you can use anywhere from .5-.6 on turbo cars and since I don't have the stock motor I don't know which number to use. I want to get 13psi out of these 315cc injectors. If I use .525 then I should have enough fuel. If I use .60 then I don't have enough fuel. Wouldn't 8.6 compression use less fuel than 9.6? So I should use the .525 or lower??? Any insights on this?