BFG DR's 315 vs. 275 - Pressure Settings?

[Bill Wilson]

I'm changing from BFG DR's 275X17 to 315X17. Depending on track conditions I have been running between 19 and 21 lbs. of air pressure in the 275's. Should I start with a little higher or lower air pressure in the 315's? The 275's were mounted on 9.5" wheels and the 315's are mounted on 11" wheels. My Corvette is a automatic '94 with Dana 44 rear end, with a dyno rated RWHP of 303 and a best in the quarter mile of 12.462 ET @ 110.86 MPH.

[jonszr1]

Originally Posted by Bill Wilson

I'm changing from BFG DR's 275X17 to 315X17. Depending on track conditions I have been running between 19 and 21 lbs. of air pressure in the 275's. Should I start with a little higher or lower air pressure in the 315's? The 275's were mounted on 9.5" wheels and the 315's are mounted on 11" wheels. My Corvette is a automatic '94 with Dana 44 rear end, with a dyno rated RWHP of 303 and a best in the quarter mile of 12.462 ET @ 110.86 MPH.

with the 315s dont go lower than 17 as they can get squirrely on the top end. start @20 and go from there. mine is a man. car and 18-19 works for me. you may get a better launch with your auto @19 -21