I just back from Thunder Racing, I have a new drive and driven pulley. Thunder says this should put me at about 7psi initial and maintain 5-6psi on up to 6500 rpm. I'm going from 1.45:1 to 1.90:1 which is near the max my rotors can spin and still be in the safe zone for wear and tear. It'll take me about an hour to install and test. My boost should not build up down low till the throttle is wide open according to Thunder. This design and blower set-up should come into affect above 2200rpm. Guess we'll see!!!




Ray