[Bobby Fazio]

I don't know how much about two-steps on a carb motor but an EFI motor must be tuned to do both. Footbraking launch RPM puts you in a lower load cell section on the fuel map and the transition to the high load launch must be smooth and have that accel enrichment stuff all tuned properly. The two step puts you in a high load cell as soon as you drop the pedal to the floor so all accel enrich stuff is finished before actual launch so you are transitioning between high load cells.