Porsche Cayman GT4 (G81)
High Performance Gear Solutions for Cayman GT4 synchromesh transmission
DESCRIPTION
Holinger’s new gearset for the 981 GT4 is specially developed for the ambitious track day driver.
The optimized ratios keep the engine in the powerband by reducing the rpm drop between shifts and improve the top speeds to suit track conditions.

Holinger PG81 Gearset Features:

Ratios optimized for fast road, track day, and racing use.
Reinforced gears are made from superior VAR nickel alloy with strength-focused tooth profiles.
New gears are direct replacements and require no gearbox modifications.
Synchro dog-rings are splined to the gear - this prevents ring-detachment failure that has been known to occur in standard GT4 gearboxes (see close-up image below).
All gear teeth are profile-ground after heat treatment, ensuring the most accurate engagement and tooth finish - resulting in quiet, more efficient running.
Comparison Chart with speeds in gears 1-6:

Stock:

PINION GEAR TOTAL
TEETH GEARBOX
RATIO DROP
rpm SPEED
M.P.H.
1ST 13 43 56 3.308 48.63
2ND 20 39 59 1.950 3202 82.49
3RD 26 38 64 1.462 1954 110.06
4TH 30 34 64 1.133 1752 141.93
5TH 40 38 78 0.950 1262 169.32
6TH 44 37 81 0.841 896 191.29


Holinger Close Ratio:

PINION GEAR TOTAL
TEETH GEARBOX
RATIO DROP
rpm SPEED
M.P.H.
1ST 13 43 56 3.308 48.63
2ND 20 39 59 1.950 3202 82.49
3RD 22 35 57 1.591 1436 101.11
4TH 25 33 58 1.320 1328 121.86
5TH 27 30 57 1.111 1234 144.77
6TH 30 28 58 0.933 1248 172.35