The first run was done with our Ultra Street pulley. Then, we changed it out with our Ultra Race pulley. The gains averaged 5.5 HP and 4.8 ft-lbs. The maximum gains are show above. 16 HP These results were obtained from Passen Motorsports on their Dyno-Jet chassis dyno.
Gains shown are at the rear wheels.
The figures without the pulley show the car modified with a cat-back exhaust. The gains reflect only the addition of our Ultra S underdrive pulley to the existing modifications, there were no changes made to any other parameters including boost. These are the results from Alamo Autosports on their Dyno-Jet chassis dyno. Gains shown are at the rear wheels. These gains reflect only the addition of our Ultra S underdrive pulley to the existing modifications, there were no changes made to any other parameters including boost.