Well, I put it in first gear, put my foot flat on the floor and then just take my foot off the clutch. Whilst clutch is depressed the ecu holds the revs at 4700 and it pops, bangs, snorts and roars. I take my foot off the clutch - instantly- and off she goes. Smells of petrol, rubber and clutch. About 4 launches per clutch I believe and also only a few launches per set of engine mounts. Scared myself sh*tless the only time I did it, but wow what a launch