4000 rpm cut?? help?!?!
well i just recently put a 50 trim on my baby with the whole bag of goodies, well i switch boost controllers cuz the one i had wasnt working and i started to boost 25psi well after a good while on tuning the car trying to get the hang of the boost control (Turbo Xs HPBC) we tried to dyno the car, when all of the sudden the car starts making noises at 4000rpm (bogging??) we check the fuel and air and its nothing out of the ordinary, someone told me it was one of my sparp plugs that went out, well i changed the spark plugs and its still doing that, A/F is at 12.5 apprx, and i left the boost at 15 psi and it still does that, does anyone have any idea on what this is????????? please help
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