Originally Posted by S6devil

same happened to me. during tune, the tuner also raised my 2step to 6k rpm up from the factory ~5000rpm. he said i would get a better launch...

however, if i use the 2step (rather than slip/dump the clutch at ~5000rpm on my own), my ET is actually slower. meaning with the 2step its worse.
now that the 2step is at 6k rpm, i hit redline sooner, so i have to shift sooner, hence i reach 60 in 3rd rather than 2nd gear, and reach the 1/4mile in 4th, rather than 3rd ... that extra shift raised my ET from 12.7 to 13.0 (all else being equal), and 60 comes in 4.4 rather than 4.1

so in fact, im always better off using my own method, just slip the clutch a little, let it grab just a little, and then raise the rpm to ~5000 or even less, and dump it... get the fastest times that way. as i said, much faster than using the 2step