Our GCU is an essential addition to any sequential transmission setup. An accurate torque reduction during up-shifts at WOT and throttle blip on down-shifts under braking is required to obtain the most efficient operation out of your sequential transmission.
Dog-ring engagement is dependant on a torque reduction (synchronized with the shift level) to perform a smooth accurate shift. Torque reduction is performed by cutting power by a specified % (and duration, 0 to 500ms) to the ignition coils during a shift event. The shift event is initated by a load cell shift knob (Push or Pull) or steering wheel paddle switches.
This allows for clutchless WOT (no-lift) shifting on upshifts, as well as clutchless (rev-matched) downshifts.
Our software provides the race engineer the ability to cut the ignition coil power by a given duration and/or percent based on the gear that the transmission is shifting into. (When the transmission is equipped with a gear position sensor.)
- Load Cell Shift Knob (Push-Pull) or (H-pattern)
- Gear Position Sensor (optional)
- Steering wheel switches from Paddleshift system (optional)
- Downshift Load Cell Threshold (mV)
- Upshift Load Cell Threshold (mV)
- Ignition Cut %
- Throttle Blip Target % (for downshifts)
- Table: Calibrate Gear Position Sensor (Gear pos vs volts)
- Table: Shift duration by gear (ms)
- Table: Upshift duraiton (ms) vs Gear
- Table: Downshift duraiton (ms) vs Gear
- Delay after Thres. (ms)
- Minimum Time between shifts (ms) - Buffer to prevent double cut