why the need for the rpm? Its very unlikely it will make the car any faster. Very unlikely.
I had a 9 sec(3350 pound) S/S spring car. 28 by 10 tire.
No clamps on the leafs, moved the RPM around on the 2 step until i found the sweet spot(4100) and the car would hook anywhere.
Off the foot or brake, the 60 foot and ET were virtually identical. Only issue i had was car occasionally got out of hand regards wheelstands.
Dont give up, your issues are fixable.
