The final test to illustrate...
The final test to illustrate the gains offered by increasing the efficiency of the motor was run on our own Project Pro Stock motor. Beginning with a stock 5.0, we installed a turbo system from HP Performance and dialed up the boost pressure to 10 psi.
The final test illustrated was a recent one with a turbocharged 5.0. This time, we ran the 5.0 with stock components, from the intake and throttle body right through the heads and cam. The single HP turbo system was configured to supply 10 psi of boost to the stock motor. After running the car on the dyno and at the track, we replaced the stock 5.0 heads, cam, and intake with pieces from Lunati, Holley, and TFS. Upgrading these components offered a huge power gain, somewhere near 150 rwhp at the same boost level.
Unlike the superchargers, which have their rotor speed regulated by the relationship between the crank and blower drive pulleys, the turbo isn't regulated by impeller speed. It's regulated by boost, so running 10 psi on the stock motor produces a given impeller speed, while running the same 10 psi on the upgraded components results in an increase in impeller speed. Had we been able to keep the impeller speed the same, the gains would have been less significant, but since the blower supplies 10 psi (in our case) to both combinations, the result was a sizable jump in power with the new components. What we could do with the turbo is drop the boost pressure to 8 psi and still have a significant gain in power over the stock components running 10 psi-thus we would have more power with less boost. Due to the self-compensating nature of the turbo, what we got instead was a lot more power at the same boost level.
After running the single turbo...
After running the single turbo kit on the stock motor, we upgraded the combination with a set of Trick Flow Specialties Twisted Wedge heads.
The Induction upgrade also...
The Induction upgrade also included a Holley SysteMAX intake manifold.
Run on the dyno, the power...
Run on the dyno, the power output of the new combination increased by roughly 150 wheel horsepower. Since the turbo is regulated by pressure, the boost was kept constant on this application, but we could have just as well turned down the boost 2 psi and still made significantly more power at a lower boost pressure.
Finishing off the trio of...
Finishing off the trio of enhancements, the 5.0 was treated to a Lunati Voodoo cam profile.