I agree with zipper06 that to low of air pressure could cause handling problems on the top end. What are you going to be running for mph?I would start at about 10psi and go from there. Making small changes till your 60 ft. are the best then you can make small changes for varying track conditions. Also 60ft times vary from track to track so just look for consistency and dont worry that your 60ft times may fall off or pick-up. The main thing is staging the same way everytime.