It hits pretty good , the tire spin starts on the line and the car catches up about 3 frames in to the run , just at gear change, where I plug it in to second . Controlled tire spin is really not a bad thing , this develops wheel speed , which is like giving it a little more low gear , and it also helps get up on the tire . the 33. 5 16 Hoosiers are way too much tire , and hurt it in the order of at least a dime. But I use them for the roll out. I have not found the limit of how much air, the more air the faster it gets , on 1/8 mile testing last year , we went 1. 18. 2 60 foot , and a 5. 32 eight . this thing want to get up and run , since then its been on a diet and lost 250 lbs , and has a little more steam .