Originally Posted by PeterRST
"Official" method.
- Accelerate up to 4th gear
- Pedal to the floor at 1500 rpm
- hit the brake at 3500 rpm, keep the throttle fully depressed though (not longer than 5 secs)
- read your gauge now
- let your brakes cool down
spot on that is
you wont make full boost in 1st and 2nd gear,4th is the best way to check