hi
with my friend gmc sierra 15 ... supercharger and cam
and tuned by shop ...
in the last time .. there problem in the car and he lost about 100+hp in the dyno
.. when we check i found timing in idle -15 / -16 ! + also all injector not work properly
i ask some guys and he say ( you must re-calculator torque model )
what you think ! and how i can re-calculator torque model