We run 14psi on a 12in wheel with the 315s and have been 1.08 in the 60ft. If a 4-link car, you have to set it up short and with a LOT of bite.........like a ladder bar car. You have to hammer the tire hard at the hit to plant it and THEN ease up to make it go. It does NOT knock it off at the hit, but about 2-3 tenths out is where a radial gets in trouble. Your starting line rpm is way high. About 3200 is where you need to be. As others have said, the shocks and suspension are key. You definitely have to control the front rise rate AND the rear extension. Whatever you know about making slicks work, will NOT apply to drag radials

Monte