Would 3.3T users in the G80 sport brake torque at 1500 RPM instead, or 2000? And when I'm letting off the brake, do you roll on throttle, it bury it?The 5.0 V8 start making good take-off torque around 2k rpms and then just take off from there. Before 2k rpm the engine is sluggish due to a lack of torque even when the thottle is opened up stock or with a Sprint Booster module.
For a good take off first turn off the traction control, then put the car in drive, next hold the brake pedal while at the same time press the gas pedal and try to keep the revs around 2k rpm, and finally let off the brake. If you get it right with minimal wheel spin then you will hook up and fly down the road. This is called torque-braking, basically a manually performed launch control. You must have good rear tires for this to work without just spinning tires. The stock all-season tires are trash so it will be hard to get a good launch with them.