when to push the ACD?

[05evobrad]

just werid question since i dont have an owners manual, when do you push the acd? like a complete stop or while moving? kinda scared to push it ha ha also whats the power ratio or whatever the differences for each mode?

[evobros]

when ur car is on but not running O0

[phillies23]

wow !

[me like jello]

when ur car is on but not running O0


i would agree, but the fact that the X has it on the steering wheel for easier access makes me wonder if it can be used to your full advantage if you were to use it turn by turn depending on the condition. (ie- intersection has a huge puddle from rain still left over, so switch to gravel really quickly) i know it's a bad example but you get the general idea.

[lqdchkn]

Push it when ever you want.Â* Â* Tarmac is for normal asphalt, Gravel is for "wet or slippery road" and Snow well kind obvious, snow or ice. I push mine whenever the road surface changes.

[antox18]

whenever its needed. you dont need to stop.

[Skiracer]

I push mine when it looks like this outside...

http://i228.photobucket.com/albums/ee20/skiracer123/Evo%20IX/snow1.jpg

[05evobrad]

hahah thanks guys always wondered ^^ as for you skiracer if your up by big bear ill be up there in a week >:D

[EVO Neil]

I push mine when it looks like this outside...

http://i228.photobucket.com/albums/ee20/skiracer123/Evo%20IX/snow1.jpg


That's freakin hilarious! Have fun skiiing!

[Jap_WHiP]

Push it when ever you want. Tarmac is for normal asphalt, Gravel is for "wet or slippery road" and Snow well kind obvious, snow or ice. I push mine whenever the road surface changes.


+1 Watch that test/ race dvd with the evo ix (The next evolution- you can get it at super auto cocks) and you'll see them switching from tramac to gravel as they go through the track!

Anytime is ok...

[o-townFLA]

Yea, you don't need to be at a stand-still. Just hit it when ever you need it...

[panem]

Push it when ever you want. Tarmac is for normal asphalt, Gravel is for "wet or slippery road" and Snow well kind obvious, snow or ice. I push mine whenever the road surface changes.

+1

[Worksport]

I just pushed it whenever i feeled it needed it, Cyber EVO sells the ACD comp and the Pushbutton switch for the Steering wheel

[shadowsCT9A]

i always push it when i feel its necessary...i have to drive out to a construction site every now and then, so when im heading out there, sometimes there is dirt all over the asphalt, so ill just push it to gravel when im taking the corners at like 80...LOL O0 :grin:

[90AWDSM]

^^^
but watch out for guardrails :2funny:





























i await the fence comment................... ASS haha

[Princess]

^^^ ILMFAO hahahahhahahhahhaha

[shadowsCT9A]

^^^
but watch out for guardrails :2funny:





























i await the fence comment................... ASS haha


hey i was in Tarmac....on gravel...lol






and why do you/did you have a busted fender? LMAO!!!


jp broski....lol

[90AWDSM]

hahahahaha

[shadowsCT9A]

^the orange wheels look pimp BTW homie...i wanna see em in person...lol

[90AWDSM]

Thanks. I was gonna go down to the BP meet but something came up and had to go into work when i wasnt supposed to. If anything you'll see them Rabbit Run if i get tires and go.


You'll see em SOmehow. LOL

[shadowsCT9A]

O0

[LiquidLife]

Does anyone know the power distribution for the different ACD settings?

[de31]

the same for all 3 settings. hold on let me find the article again.

[90AWDSM]

Isnt it all time 50/50 distribution?

[de31]

D. How the Tarmac/Gravel/Snow switch influences the ACD

Despite popular belief, this switch DOES NOT change the torque split. The differential is geared at 50:50 and cannot be changed by the push of a button. What this switch actually does is quite simple. Each setting determines how long the ACD will delay in freeing the center differential after a steering input is made. In addition, it will determine how much locking force the ACD will exhibit on the clutch pack and center differential. (10) (11)

Tarmac is the setting to be used in dry, paved conditions. In this setting, the ACD will almost immediately allow the center differential to go into a free state upon detecting a steering input. Additionally, this mode provides the strongest limited-slip clamping force of the three modes. (7) (12)

Gravel is the setting designed for wet or loose roads. In this setting, the ACD will delay in freeing the center differential for a moment (possibly 2-3 seconds). Of the three modes, this one has the second strongest clamping force. (7) (12)

Snow is the setting designed for, you guessed it, snow. In this setting, the ACD will delay in freeing the center differential for much longer than the other two settings (possibly 4-5 seconds). Of the three modes, this one also provides the least amount of clamping power. (7) (12)

http://www.socalevo.net/index.php?option=com_smf&Itemid=37&topic=17977.0

[LiquidLife]

I don't know crap aboud the ACD, someone tell me how that works in simple terms.

I understand the LSD perfectly,

But not the steering input thing

[90AWDSM]

Well after reading that article, I'm sure you won't have any further questions about it. :D



A good Read !

[LiquidLife]

Oh okay, I'll have to read it later, thanks

[de31]

this is how i see acd working, anyone correct me if i'm wrong.

let me see if i can do it quick n simple

when turning front and rear axles turn at different speeds

in tarmac mode the lsd is close to locked while accelerating.

when you corner it opens the center diff so that you can turn (with the rear axle traveling a shorter distance than the front.)

http://static.flickr.com/9/75406254_d439069b18.jpg?v=0

in gravel or snow it holds the lock for a determined amount of seconds so that it forces both front and rear to run the same distance, causing a rotation on the center axis of the car instead of having the rotation axis over the rear axle.

[maikumaru]

de 31 knows whats up,

ACD just adjusts the timing between opening and closing the center diff.
it is not limited to steering input. Braking and acceleration are also in the equation.

I have never seen a track/rally driver adjust the ACD while driving the course. ACD is tuneable and people do/have tuned the ACD for the condition/track/area they are driving on.

[Evo121]

you could probably keep it on tarmac on straightaways, on turns you could switch from gravel to snow to get more grip or break the LSD loose to slide

[maikumaru]

no that is missing the point all together.

http://auto.howstuffworks.com/differential3.htm

open=equal torque to all wheels.
closed=unequal torque to all wheels

Steering input+braking+acceleration will alter what the commands the ACD computer sends to the ACD pump. All of which is tunable.

with the ACD you must think front to back...not side to side (that is what the LSD is for or AYC non usdm evo or SAWC in evoX)

[06evoMR]

cool, i usually press my ACD every 3 sec just for the hell of it. been doing it for 2 yrs! wee

[s78]

you could probably keep it on tarmac on straightaways, on turns you could switch from gravel to snow to get more grip or break the LSD loose to slide


Absolutely agree with that. The only question is, would that be before or after you hit the crack pipe?

[90AWDSM]

^
probably During the HIT as well

[littlejap33]

i used Gravel mode today in the rain hahaha its whatever i gues hahaha

[Evo121]

watch the JDM video of the evo IX jdm battle, one of the drivers switched between tarmac and gravel on turns. watch it



you could probably keep it on tarmac on straightaways, on turns you could switch from gravel to snow to get more grip or break the LSD loose to slide


watch the JDM video of the evo IX jdm battle, one of the drivers switched between tarmac and gravel on turns. watch it



Absolutely agree with that. The only question is, would that be before or after you hit the crack pipe?

[LiquidLife]

ive been using snow mode in the rain, it works well, Lsd doesnt lock up like it would when in tarmac mode in the rain, very nice. the evo was noticably slower on full throttle due to lsd keeping me grounded.

[DirtyEvo]

push it now!!!

its snowing & raining!!!

:2funny: :2funny:

[drush08]

i push mine whenever the roads change conditions

[Sam Smash]

I never found a need for it around here. Even when it rains, I leave the damn thing alone. What more do I really want from the evo.

[CRX2EVO]

I push mine at every red light

[LiquidLife]

I never found a need for it around here. Even when it rains, I leave the damn thing alone. What more do I really want from the evo.


I never did, but I recently got some shitty street tires because I screwed them up by not getting an alignment and didn't realize it and wasn't ready to fork over the money for good ones...

So anyway, the tires suck, and the ACD really helped in the rain :)

[Terenus]

cool, i usually press my ACD every 3 sec just for the hell of it. been doing it for 2 yrs! wee


I press it during the holidays so it looks like alternating Christmas lights.

[LiquidLife]

Big trouble in little china!!!!!!!!!!!!!!!!!!!!!!!!

[lqdchkn]

You guys show really read the technical articles on how the ACD works.Â* It operates almost nothing like a standard differential...being computer controlled.

Simply put the different modes control when the ACD unlocks...i.e. remove the power from the rear wheels.Â* On dry pavement you want it unlocking as fast as possible... i.e. going into a corner to assist in cornering.Â* On slippery surfaces you want to delay that some what so more control/stability is maintained.Â* This is what the different settings change.

[drknite]

So all my ACD lights are on. Does anyone know what causes that problem?

[DirtyEvo]

you went to fast to furious!!!!

[drknite]

hahaha thanks very insightful

[pikadosboy]

hahaha thanks very insightful
did you replace the clutch?

[drknite]

YEA

[ThClaw]

I got this same problem ^. Realize this is kind of old couldn't find any people who have solved it. Put a small battery in and they all came on. Seems it means acd pump is going out? It's weird though that it just happened after the battery.