For burnouts with my drag radials, I just hold the car around 5500 rpm's in 1st gear only for about 10 seconds. Then I get to the line, hold between 1500-2000 rpms and just punch it. As long as the track is prepped well, I can take off as hard as I can, which is really nice. I'm sure someday the rear diff will give out, but until then, I'll keep enjoying the power to the pavement.