Transmission & Driveline
The Starlet runs an Elite Racing Transmissions IL200 6-speed sequential gearbox, selected for its extremely compact and lightweight design at under 30 kg. The gearbox uses custom ratios and interchangeable drop gears, allowing us to alter the overall gearing without having to change the differential ratio.
With the power and competition use of the Starlet, the IL200-6S is operating near the upper end of its intended application. As part of our preventative maintenance programme, we life the gears and crack-test the gearset annually when the car is being raced.
We have also developed our own gearbox lubrication improvements, including an external oil cooler, electric circulation pump and internal oil spray rail within the gearbox casing. Gearbox oil temperature is monitored through the Haltech engine management system.
Sequential Shift Control
The flat-shift system has been developed to give us two different strategies. A 2-channel Hall-effect rotary position sensor monitors the selector drum position , while an NPN 12 mm proximity sensor monitors the position of the gear lever.
This allows us to use either a timed ignition/torque cut based on gear-lever position, or a torque-reduction strategy based on actual selector-drum position. Having both signals available has allowed us to experiment with shift strategies and optimise the system for fast, reliable sequential changes with the Haltech ECU.
Gear Ratios
Gear Ratio
1st 2.420
2nd 1.867
3rd 1.563
4th 1.333
5th 1.142
6th 1.000
Drop gears 20:21
Differential 4.777:1
Driveshaft Development
We have also experimented with a carbon-fibre driveshaft and several different yoke and CV-style joint arrangements as part of the driveline development programme. The car currently runs a steel driveshaft, which has proven to be the preferred solution for the present configuration.
Gallery & Additional Project Content
