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Old 01-19-2010, 05:52 PM   #1
mattminer
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Default AVCS / ECU Question

Hi All,

I have a car here, its an 02 WRX with a full EJ257 swap. Its currently running on the stock 02 computer. The AVCS oil lines are hooked up, but obviously they arent setup electrically because they are not supported on this ecu. This car is running a custom bracket for the cam sensor, and is also TGVless.

I was wondering if it was possible to use the EJ207 ecu to run this motor or if there was some sort of electronic incompatibility? Ive heard conflicting info, I am not sure why this would not work.

M@
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Old 01-19-2010, 07:03 PM   #2
korhan
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yes you can run acvs with ej207 ecu but you have to change cams also, cause 257 and 207 cam angle trigger is different. camshaft position sensors are same
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Old 01-20-2010, 04:45 PM   #3
mattminer
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That is the most straightforward answer Ive seen in a long long time. Im using the 02 style sensor on the 257 now though, picking up off the cam gear instead of the camshaft with a custom bracket (like the cosworth one). Would the camshafts still need to be changed?

M@
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Old 01-20-2010, 07:09 PM   #4
korhan
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cosworth or other brands cam angle sensor brackets main aim is to run avcs heads in non avcs engines like you did so that i thought you have to take the home signal from the original place to run avcs correctly. we made that thing in some ej207 edm car, ej257 engine and head swap, you just have to make some little work on the sensor bung if needed and use 207 cams with edm/jdm type angle trigger.
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Old 01-21-2010, 04:07 PM   #5
korhan
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Today i check out the 207 257 swaps we made to remember the work we did.

257 has only 2 sensors on both camshafts which they also act as camshaft position sensor while working as avcs sensor, 207 has 2 avcs sensors on the position as same as 257 sensors and also has a camshaft position sensor at the cam gear(like wrx) so when using an 207 ecu on 205 harness with 257 head,
you have to use 207 cams (for cam angle trigger) and also you have to make wiring for additional avcs sensors(it has to be shielded). I guess a company is making adapter harness for this type of situations but i cant remeber the name. search nasioc i guess you can find it.
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Old 01-21-2010, 06:35 PM   #6
mattminer
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Thanks! Your information is invaluable!
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Old 01-21-2010, 06:57 PM   #7
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you are welcome
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Old 04-30-2012, 10:59 AM   #8
khalonen
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Awesome info here. I'm in the same boat.
Allthough I have EJ207 single avcs motor in the car atm. and building EJ257 (from 2008 edm sti full with dual avcs heads and sensors, no intake mani) as for spare motor. Swapping it when the 2.0 decides to let go, still going strong at 120.000km though.
So this is just sanity check that I got everything right:
For the EJ257:
I need to lock the exhaust avcs gears (to 17deg retard, 0deg overlap position) and leave sensors and solenoids in place. Plugging the oil galleris in the camshaft. Think I cannot use exh. cams out of the EJ207 as the oil sealing is different?
Then take the intake cams and sensor (all 3) out of the EJ207 and use them for single avcs usage. And the front cam position sensor needs aftermarket bracket as the EJ257 heads dont have it on back of the left hand intake gear.

Then bolt on drive-by-cable intake manifold, and swap the motor in? anything critical I'm missing?

Thanks!

Last edited by khalonen; 04-30-2012 at 12:10 PM.
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