Single AVCS
Also known as Intake AVCS, Single AVCS means the engine has AVCS on the two intake cams (left and right intake).
Dual AVCS
Also known as Quad AVCS, Dual AVCS means there is AVCS on the two intake and exhaust cams. All models of Dual AVCS engines are also run by CANBUS-equipped ECUs. This means a simple ECU swap for a Dual AVCS engine into the vehicle is not possible. For those that are set on getting Dual AVCS working (except for 2005/2006 Legacy GT and Outback XT) in their single AVCS vehicle, the best solution would be to find a plug-and-play standalone ECU for the chassis and then add in the additional wiring for the exhaust side cam sensors and AVCS solenoids. The connectors required for this are linked below.
3-wire Camshaft Position Sensor Connector
How do I make the AVCS (single or dual) work in my swapped car?
Unfortunately, this is not an easy answer. Since Subaru has so much variation in its wiring, it all depends on what swap was done.
2002-2005 USDM WRX Chassis
For some cases, it's simple - For a 2001-2005 JDM STI or WRX into a 2002-2005 USDM WRX, all that is needed for the single AVCS to work is the iWire AVCS Bulkhead Kit and/or the iWire AVCS Intake Manifold Kit.
EJ20XY Engines
In other cases, it's more complicated. If you're doing a 2005-2006 Legacy GT/Outback XT with an EJ20XY, you can use the JDM ECU and swap the immobilizer chip so it runs. We would send a custom AVCS kit to make the dual AVCS work. This assumes an EJ20XY with two wire cam position sensors.
Other Situations
For other cases, it's more difficult, and it would be best to contact us before a project is started.
What if I run the car without the AVCS hooked up?
Yes, the engine can run the car without the AVCS hooked up. It doesn't hurt the engine but it also keeps it from running at peak performance since the cam is sitting in the least advanced position.
