Gearbox G 97 / 63; Production Gear Ratio Set; Limited Slip Differential; Gearbox Mounting - Porsche 911 GT3 Cup 2008 Technical Handbook

Gearbox G 97 / 63

Production gear ratio set:

Limited slip differential:

Gearbox mounting:

The Porsche six-speed sequential gearbox is fitted with a limited slip
differential, and oil filter and a water / oil heat-exchanger for cooling
purposes. All gear ratio pairs can be changed individually to suit driver
preference, engine and the circuit characteristics. The gear pairs are
uniquely matched and should never be mixed. If one gear is damaged
the gear pair should be discarded.
Only one gear ratio set is allowed in the one-make cup races.
When filling the gearbox with oil for the first time, i.e. when the
complete system, including cooler, filter and oil lines are dry, the
system capacity is 3.6 litres. Following a gear ratio change only 3.0
litres of oil should be added. The use of Mobil 'Mobilube' SHC gearbox
oil is recommended.
Crown wheel and pinion
st
1 gear 12/38
nd
2 gear 15/32
rd
3 gear 18/31
th
4 gear 20/28
th
5 gear 23/26
th
6 gear 29/27
The locking torque of the differential is 40 % (power) and 60 %
(braking) (Dynamic locking value).
The differential lock is checked by means of friction force
measurement in which the preload and wear of the clutch plates is
checked.
See page 18
A solid gearbox mount reduces the relative movement of the
complete drive train. The result is improved handling particularly
during weight transfer due to on/off throttle application. Using the
solid gearbox mounting increases the noise level in the cockpit.
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