Porsche 2012 911 GT3 CUP Technical Manual page 95

6.4.1.4. Upper mount
6.4.2. Rear axle
6.4.2.1. Ride height
The upper-mount position can be adjusted by using the slots in the car
body.
Upper mount
Fine camber adjustment: 1 mm equals 6'
The car must be placed on a level surface (set-up platform) to check the
ride height. The front and rear suspension should be loaded and unloaded
(compressed) several times to allow the suspension to settle.
Ride height adjustment is made by rotating the spring perch.
Measurement point rear axle:
92