The car is a a8 z06, i tuned it when it was stock blower and went 10.8@132mph, it was sold and the new owner went with a different tuner, and now it has come back to me with a procharger on it, but the car is making even less horsepower than it did on the stock blower and i cant find a reason for it to happen
we tested the system for leaks, there are no leaks, we checked the by pass valve, its ok, we tested the engine for compression and leakdown tests it all came ok, we even tested different pulleys and there is no change in power.
the car has:
long tube headers
full 3" exhaust with the npp
aux fuel pump
innovators west 16% overdrive crank pulley
f1a94 supercharger kit
So we tested on the stock pulley that came with the system (i think it was 4.3")
dynopulleyday2.hpl
then we tested the 4.13 pulley, when we tested this pulley the car went leaner and it needed some correction so i though that it was going on the right direction, but ended up again at the same horsepower than before.
dynopulleyday4.hpl
then i corrected the afr
dynopulleyday5.hpl
and last we tested the 4.00" pulley it needed no change on the tune, it still made the same 54x whp as the two pulleys before
dynopulleyday8.hpl
On this last tune i tried adding 20% to the torque tables and see if it made any change but there was nothing so i left it there as there seemed to be no change in power with any change i made on the tune or mechanically i started the day on 54x whp and three pulleys later it still had 54x whp when i feel the car should be well into the 700's whp, there is no belt slip as we made sure the belt was as tight as we could get it to be and we went with shorter belts on every pulley change.
Any ideas, anything i havent seen, any experience like this?
this is where the tune ended up
prochargertune14.hpt
we tested all of this in non alcohol (E0) 100 octane fuel