The rear panel calibration adjustment allows you to fine tune the BCS for your vehicle. If the setting is too high or too low, your car will not make full power. After the BCS is installed, the rear panel adjustment can be set during a short test drive. Start with the setting on maximum (100). See if the car pulls strongly to redline. Turn down the setting until the cars pulls strongly to redline in all gears. If the cars surges (cyclic variation in power), turn down the setting a little bit.

Wiring Instructions
The diagram below shows the location of the wires on the ECU connector plugs that are used to tie in the BCS. Be sure to trace the wires to the ECU pins to insure that connections are made to the correct wires. Do not go by wire color alone. You must confirm the correct wire by connector location. Connections will be made to the wiring harness a few inches from the side of the engine computer. All connections are made using the crimp connectors that are provided.

The T-tap connectors are in two parts. The dark red piece is clamped onto the wire with a pair of pliers. After striping the corresponding wire from the BCS, crimp on the male spade connector. Make sure you crimp onto the bare wire and not the insulation. Shrink the insulation onto the wire with a heat gun. Inspect the male spade connector to make sure that the spade terminal is centered inside the insulator. This will insure that it mates properly with the T-tap connector. Push the male spade onto the T-tap connector until it snaps into place.

Download pdf Audi A4 and Volkswagen Passat Gen 4 1.8T BCS (Boost Control System) Installation Instructions