We tried some different things early on with the ACD which ended up causing it to just do nothing (stays open). The car is certainly driveable on the street but racing like that is a total nightmare. Once one end gives up, it just fully lets go. And if you have an evo setup right, that will probably lead to massive oversteer and not really the good kind.

Mine was an understeering pig without the ACD and AYC.. :D but I did drive like that for a couple of months..

Semi related question. Can I drive my car without the pump hooked up and no ACD fluid? T-case is filled of course...

Yeah its fine. Just cap off any lines to stop debris getting into the system. And obviously no power to the pump or solenoid...

To confirm, this is my fresh built ACD T-case from TRE. So the ACD portion is completely dry. Just has Tcase fluid in it.

Yeah the lubrication comes from the gear oil. I had my pump off my car for a few weeks before I got around to finishing relocating it to the trunk. I never disconnected the banjo from the xcase but rather started my line right where that rubber line connects in the trans tunnel. But it was capped off with whatever ATF fluid was left in the system. So while my system wasnt completely dry I still dont see it being an issue.

Maybe ask Kiki he's an ACD guru. Or perhaps email Jon?

The ATF you put in the ACD reservoir which goes through the pump and down the line doesn't lube anything. All it does is apply pressure to the piston, which applies pressure to the clutch pack. So, yes, it'll be fine. I would install the line on the case though so nothing gets in there.

Thanks everyone for the responses to my questions. The ecm is out and on its way to ER. I'll report back when I get it completes the return trip and I get back on the track.

what kind of usage exactly does your evo see? looking forward to hearing about it

HPDEs mostly. My two closest circuit facilities are summit point and NJMP. Maybe I'll make it down to VIR this year, but we'll see.

excellent, looking forward to hearing your review

hmmm, while the car is apart to fix my transmission issue, I may have to send my ACD ECM to ER. that combined with the new trans (planning on TRE) with a Maxx-Lock rear diff and im set!

Going to have to drive easy for a while to get used to the new way it handles.

new trans with max lock ? you mean the rear diff? if you're doing rear diff and acd i'd do one at a time honestly to see what it's doing where. for me there was a small difference on power-on oversteer because i already had a rear diff, huge changes in turn-in mid corner

finally took the car for a spin - rotates awesome. English Racing leaves the "Snow" mode as stock Tarmac, and the difference is pretty incredible

Its kind of interesting how its done on the ER ACD tune with the order being actually backwards from OEM. But I actually like it. I can quickly on the fly hit the button to decrease lockup if needed. Would be easy enough on track to go from max to mid or mid to low on a straight.

And the Snow is the same lockup as OEM, but it keeps the lockup to a higher speed. Stock ECM tapers it off above a pretty low speed (Im thinking it was something like 30mph). That might be fine for stock power levels, but I could see why higher speed 2nd corner exit definitely wasnt the same as low speed 2nd previously. After the tune, it should be consistent.