Trying to guess my horsepower increase from pullying down for 2 additional PSI of boost on this 427 motor.

The addition of the exhaust and cam would lower the boost some, currently at 8PSI, should be around 6.5ish PSI when im done, so ill turn that up two more PSI.

Any ideas how much is every pound of boost worth on a 427?

FYI, 10.7:1 CR and 93 octane pump gas.

 

This will vary alot, how much power is it making right now?

 

never put it on a dyno, advertised 750bhp. HPTuners says 720bhp from calculated torque data, and im sure it will vary but any ballpark figure?

the cam will drop dynamic compression and the exhaust will drop the boost and free up alot (very bad exhaust at the moment)

 

I would be willing to put money on that you would get atleast another 30/30 out of 2psi, EASILY. Maybe even double that.

 

generally 20 hp per # of boost

 

On a 427 it is about 20-30 per wheel true, i was just making sure im not over expecting or being too optimistic on power gains.

 

Id say your pretty close, a supercharged engine will be just a little less then a turbo cause the drag of spinning it faster takes a little more away then back pressure on a turbo setup.

 

I think you will see more gains out of a custom cam and exhaust than you will from the addition of the pulley. The combo of the three could net you another 75hp pretty easily depending on your current setup.

 

Actually i am doing all three and if you hear of my current setup youl bet the increase will be more like 100+ hp

 

Figure out the difference In air flow at a given rotor speed and devide by ten. That will give you a ballpark estimate.