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 Dual AVCS engines are also controlled by CANBUS-equipped ECUs.
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 (Non AVCS to Single AVCS)
This case is a simple one. 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 with 2005 or 2006 Legacy GT/Outback XT - (Single to Dual AVCS)
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 to get it running. We would send a custom AVCS kit to enable dual AVCS. This assumes an EJ20XY with two wire cam position sensors.
EJ20XY Engines in any Single AVCS 3-Wire Cam Position Sensor Platform - (Single to Dual AVCS)
This means a simple ECU swap for a Dual AVCS engine into the vehicle is not possible. For those who 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 required connectors are linked below.
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.
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