ACD-Who uses it?

[em1toevo]

It's raining today, so I was just wondering who actually uses their ACD Gravel(or Snow) setting(s). I try to whenever I think about it. Honest'y, I don't drive hard enough in the rain to find out if there is a noticeable difference. I'd rather not hyroplane while testing it out.

[Evolvedgti]

I use it and in the rain i sometimes feel the pumping of the ACD clutch packs. I never feel that in Gravel on dry ground.

[em1toevo]

I'm not sure I know what you mean by, "I sometimes feel the pumping of the ACD clutch packs."

[Hikaru]

I always use it. I never feel any difference in driving. But if Mitsu put it there it must do something.

[em1toevo]

I've always heard that it slows the engagement of the clutch to prevent tire slippage under hard driving in slippery conditions. I will look it up to be sure.

[Evolvedgti]

What I meant, is in the rain while taking a turn faster than I should(maybe). if the ACD is in gravel mode, i have felt te ACD working. Kinda felt like the ABS pumping of the breaks, but in the middle of the car. I assumed it was the ACD. Maybe not. You know my situation, so i am speaking from memory. its not like it happened yesterday. :)

[em1toevo]

Active Centre Differential

The Active Centre Differential, first introduced in the Evo VII, is an electronically controlled hydraulic multi-plate clutch which distributes torque between the front and rear to improve traction under acceleration out of a corner. It works in conjunction with Active Yaw Control which enhances grip and steering response whilst driving through the bend itself. Using sensors, ACD regulates slippage in the 50:50 torque-split diff from free to lock-up according to speed and load. So under hard acceleration the ACD moves towards lock-up to put more torque down on the road for stronger traction, but with rapid steering inputs it operates virtually like an open differential to improve steering feel and response.

A choice of three setting - tarmac, gravel and snow - operated manually, gradually lock up the Active Centre Differential depending on road conditions.

Taken from: http://www.mitsubishi-cars.co.uk/features/ayc.asp

[Evolvedgti]

"ACD regulates slippage in the 50:50 torque-split diff from free to lock-up according to speed and load. "

This is what I must have felt!

[blkonblk2red]

^i've heard not sure if its true it only works under like 30-50 miles an hour.... messed with it a few times felt a little difference

[BlewByYouEvoVIII]

^i've heard not sure if its true it only works under like 30-50 miles an hour.... messed with it a few times felt a little difference

no way that is true. I've felt it at 80+ =/ .... uh... ya.... not fun, I hate ACD.

[BlackIX]

well u wouldnt want it to be lockin up and stuff goin 100mph

[TouringBubble]

My understanding is that the lock timing changed by the ACD promotes understeer in the gravel and snow modes.

[Evolvedgti]

no way that is true. I've felt it at 80+ =/ .... uh... ya.... not fun, I hate ACD.

Glad I am not the only one whom has felt it. thought i was crazy. Damn i miss my car :(

[MeFryRice]

My understanding is that the lock timing changed by the ACD promotes understeer in the gravel and snow modes.

Although that would make sense, I've read that it induced oversteer. I'll have to do some research and see where it was posted.

[TouringBubble]

I've testing all 3 modes during autocross events, and the tarmac mode is definitely the most prone to rotation. I got loads more push with the other modes. Also, loose/wet/icy surfaces have lower traction to begin with and understeer is safer ... but not faster.

[jktripp]

i use them

[Charlie]

I used it when I had it, could tell a diff. in steering and power band.

[VIIIrs]

oh wow i havn't used it yet i'll check it out since it's nasy today!

[TouringBubble]

Some of the tuners have logged that the ECU pulls timing in the gravel and snow modes as well, so you'll have less power than in tarmac mode. I'm not certain how much it pulls though.