Connecting COMPUSHIFT to Holley EFI / Racepak
This guide provides details on setting up a COMPUSHIFT Sport or COMPUSHIFT Pro with a Holley EFI using the CAN / RacePak protocol. These two systems are connected together using CAN bus, and signals like throttle position and engine speed are automatically transferred between the two units. No other connection is required.
Setup Instructions
Ensure that both units are powered by the same switched ignition power
Connect the CAN bus between the COMPUSHIFT controller and Holley EFI.
On the COMPUSHIFT Setup app or handheld display, navigate to the “Vehicle Setup Menu”.
Ensure that the transmission type is set correctly.
Set the engine type on the COMPUSHIFT controller to “Holley RacePak CAN”.
Set the Holley EFI to broadcast the RacePak protocol as shown in the video below.
Navigate to the dashboard on the setup app or handheld display.
Start the engine. Confirm that the engine speed and throttle position are reading correctly on the display.
Do NOT drive the vehicle until you have confirmed CAN communications are working properly and you have no trouble codes.
An incorrectly calibrated throttle position sensor (TPS) on your Holley system may report a throttle position value greater than 100% over CAN bus. This will cause a trouble code on the COMPUSHIFT controller.
You can diagnose CAN bus problems by going to Diagnostics / Network Diagnostics on the CS Setup App. The CAN 1 Receive Count should be steadily increasing when the ECU’s are communicating correctly. The error counts should always be 0. If you do have errors, do confirm that the CAN bus baud rate is set correctly in Network Setup.