Unless your in 1st gear never, ever, ever, ever floor it unless you're at 3k rpm or higher. Little 4 cylinder+ alot of boost at low rpm= boom boom. If you're trying to do some roll races my sweet spot has always been 40-45 mph in 3rd, thats about 3100 rpm with my 3.55 rear and floor it.I know every car will be different but lets assume a relatively stock 2.3 Ecoboost 2017....
What would be the best or what is your preferred RMP/gear to take off at when trying to get the best jump and SOTPs feeling?