I have a buddy with a 99 dually. He has diablo tuning and a bully dog intake and says that in his race tune hes getting 36 PSI. I said he MIGHT be getting 26, but I doubt that too. I get like 24-25 with my PHP chip. Any thoughts?
Maybe he is using an electronic gauge that picks up from the OBD II and it is reading MAP(manifold absolute pressure). Which reads 15psi higher than PSIG.
I have a diablo chip in the desk, it would only hit around 25psi when in the truck.
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