Electronic Transmission Control - ACR
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ACR as a natural progression from providing engine control systems, have developed an innovative product to control the electronic solenoids and valves found within modern electronic transmissions.

The original control boxes used by car manufacturers to operate these gearboxes are too integrated with the vehicle to enable the use of the gearbox for a conversion or competition car. Additionally the characteristics of a road car with its soft slow gear change and lack of a truly manual control are less suited to use for competition use.

Our system controls the complex functions of the electronic valve body within the gearbox to provide a completely tunable solution. We can increase the gear change speed and firmness, give total control over the change points and parameters, allow a semi automatic clutchless manual operation, and run the torque converter locked or unlocked in whatever gears or speed needed to suit the application. Many more functions are possible to suit a custom application.

RM Bartlett
Ian Bartlett, Sweet lamb 2010.
AT 4 X 4 206 with ACR Jaguar 4.4, Omex 710, and ACR controlled ZF 5 HP 24 E

Switchable calibrations such as a sport / cruise mode, or a selectable torque converter lock up strategy.

Array of inputs and outputs to include speedometer driver, cooling system control, mode switches, engine speed and engine load etc.

Paddle shifter, steering wheel buttons or sequential shift lever options

Full throttle full power gear change, or with option to control or cut engine torque during the gear change via engine management interface - for either gearbox life or avoidance of traction loss through shock load during the gear change.

CAN network compatibility - send and receive data to engine management or dashboard on a twisted pair wire automotive network.

True manual control, with programmable overrides to ignore gear change requests which could overspeed or damage the engine.


Martin Gould, Forest Estate, Scotland 2010.
Mattseratti special with ACR 5.2 Rover V8, Omex 710, and ACR controlled ZF 4 HP 24E 



The list below are the models of gearboxes currently covered. Contact us if you have an application in mind.

ZF 4 HP 22 / 24 E

ZF 5 HP 24 E

Jatco Freelander / Rover application

GM 6L 80 / 90 E This box retains the original controller mounted inside the gearbox case. We can supply an engine management system for the LS range of GM V 8 engines with the CAN code embedded to operate this gearbox.

Richard Wynn Williams

Richard Wynn Williams in flight, Sweet lamb 2010.
Tomcat 88" 4.6 RoverV8 ,Omex 710 and ACR controlled ZF 4HP 24E transmission.



Prices for a wiring harness, calibration and controller from
£ 1350

Roland Marlow / Lisa Khoo

Roland Marlow / Lisa Khoo Driffield 2008.
Freelander KV6 with Omex 710 + Jatco Auto with ACR control.


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