An ultra-low 1st gear ratio (particularly when combined with a wide ratio spread) and a quick-revving engine will give you a challenging 1 - 2 shift on an aggressive launch. The key is to anticipate it and be prepared for a short, fast shift after takeoff. Instead of grannying the shift, you'll have a better result if you keep your foot in it and shift aggressively, as long as you don't blow out the rear tires and lose it altogether. What causes the lurch is engine braking in a very low gear as you let off for the 1 -2 shift. Seize control of the car, establish yourself as the master and nail that shift early. Don't allow the quick RPM buildup to intimidate you into letting up and you'll be rewarded with a neck snapping (your head will snap backwards instead of forward) shift into second gear.
