get in fourth gear 3Krpm or so whene the dyno guy is ready stand on the gas as the rpms start up spray. I let it off about 7K I pull till 7200 on the street but with my turbos I quit making power about 6K. I run a wet shot on a switch I can turn it on or off at will (and within reason) I also let off the bottle a few hundred rpms before shutting the car down dont want any nos backfires.