No thats incorrect way of checking....to many variables....road surface, tires, traction, rear brakes, suspension, etc.
One way is to use a trans-brake, another would be to drive the car and see how high the rpms flash right before the car takes off. The only problem with that is people will start to blow the tires off before getting a good reading on the tach. So most people check thier stall while on the chassis dyno if they don't have a trans-brake. From an idle they will just stand on it and see how high the rpms will climb intionally before it will "REALLY" start to excellarate the wheels on the dyno.
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