AVCR + SI Drive & Wiring Diagram

hello all!

so i've done a quick search and can't seem to find if anyone has manged to do this. i don't even know if it'll work...

so we know that the SI drive thing changes your timing, ignition, fuel etc.

the one thing it doesn't seem to do is change the boost.

basically, what i'd like to be able to do is to be able to get the SI drive thing to activate the boost setting via the AVCR.

so for to be off, for mode A and [s#] for mode B.

anyone ever attempted this?

also, can anyone tell me which wiring diagram i should be using to wire this up... i can't seem to find one for the LGT.

http://i267.photobucket.com/albums/ii287/bac52/Page1.jpg

http://i267.photobucket.com/albums/ii287/bac52/Page2.jpg

http://i267.photobucket.com/albums/ii287/bac52/Page3.jpg

http://i267.photobucket.com/albums/ii287/bac52/Page4.jpg

I think it would be pretty easy to have S# kick on a high-boost mode.

I'm a little old fashioned, so I'd probably watch each terminal with a multimeter, then pick a suitable feed to tap into for a relay.

...so we know that the SI drive thing changes your timing, ignition, fuel etc...

Actually, this is news to me. I thought all SI drive did was change the requested torque per pedal angle.

http://i267.photobucket.com/albums/ii287/bac52/Page1.jpg

well it looks like the actual mode selector changes resistance for the signal wire. The pin 3 green wire is actually connected to ground. Have you looked at the actual harness yet? I'm not a big fan of Subaru wiring diagrams, they don't always show where every wire goes. It looks like there is only two wires actually going in to the switch, one power and one ground. That's going to make things trickier.

And did you look at the actual AVC-R scramble switch wiring diagram?

http://www.legacygt.com/forums/attachment.php?attachmentid=79249&stc=1&d=1264003931

It's going to be a lot more complicated than you think. You'd probably have to build a small microcontroller to do this or use a couple relays. The only way to turn the AVC-R "off" easily would be to have the SI drive switch control a relay which supplies power to the unit. In your control logic table you would have to have

Power relay OFF

Power Relay ON, scramble switch OFF

[s#] Power relay ON, scramble switch ON

also, do you really want the AVC-R to be off? The car is going to be pretty slow at spring pressure, slower than stock. I think that's kind of useless. Using the 3 way selector is just going to be a big wiring mess that will be hard to troubleshoot.

If you really want to do something like this, maybe you should just hook the scramble boost directly to the steering wheel switch. There's a Brown/White wire you can probably tap.

isn't scramble just a temp over boost?

i was thinking along the lines of:

I = 0.7 Bar

S = 1.0 Bar

S# = 1.3 Bar

i'm currently running 1bar and getting a wastegate error due to overboost (i think)

isn't scramble just a temp over boost?

 

i was thinking along the lines of:

 

I = 0.7 Bar

S = 1.0 Bar

S# = 1.3 Bar

 

i'm currently running 1bar and getting a wastegate error due to overboost (i think)

not exactly what you mean as no boost, boost a, boost b, but

si drive does control boost in I mode

I = ~.7 bar - dont remember i know its above .5bar but not even close to .9bar maybe spike to .8?

S & S# = ~.92-.96 bar - kindof hard to see on the gauge but its between .9 and 1

this is according the the Lamco boost gauge

si drive does do what op said, also throttle position iirc I mode floored = 60% throttle and S# 60% foot = 100 throttle

i know in s# i can make full boost without 100% pedal floored

i did a lot of research and find info about si drive, cause i was interested in it

for stock car not much diff in power but few people says stage Ii is when si shines

ill post the #s when i find them

edit: so i couldnt find the power numbers in the diff modes for Stage II

but i did find this document on Cobb Tuning How Subaru’s Factory Boost Control System Works

http://www.cobbtuning.com/info/?ID=3482

dont know if this helps but found it interesting - in the how factory boost control system works

"Wastegate Solenoid Valve - An electromagnetic solenoid which controls the air flow from the wastegate actuator to the turbo inlet. This device is normally closed when no voltage is applied. When 12V direct current (DC) voltage is applied, by the drivers in the electronic control module (ECM), to the wastegate solenoid valve, it fully opens allowing air to pass through the device. A 0% Wastegate Duty Cycle (WGDC) setting will allow the solenoid to stay fully closed; which will force the turbo to run mechanical boost pressure. A 100% WGDC setting will force the solenoid to stay fully open; which will force the turbo to run maximum boost pressure."