can someone please explain to me exactly how this YAW control works and what it is in simpler words? i read the manual and watch videos but its just not processing through my brain lol. maybe give me an example of what it does in a situation?
thanks,sean

 

It transfers torque (in the rear only) toward the wheel that needs it most.

 

It's supposed to increase cornering speeds by applying more torque to the wheels that have the most grip.. it's also supposed to reduce understeer.

There's a somewhat basic description at Wikipedia (LINK), but if you follow the links in the footnotes, you can also find other more in-depth explanations of how AYC works.

 

it kicks in about 4000 RPM and makes me go YAAAAAAAAWWWWWW

 

I like and agree but it should be noted you have to hit 4k in a turn

 

Push in the ASC button for 3+ seconds and it goes away.

 

but does it go away 100%?

doesnt it make the one wheel spin faster in the curve?

 

It's a little different than just saying "it gives the torque to the wheel that needs grip". More specifically, in a cornering situation, it applies more toque to the outside wheel by slipping in a speed increaser gear set, therefore helping the car rotate through the turn. At the same time, it is also reducing speed of the inside wheel, sort of like steering the rear wheels with torque. All of this is to kill the understeer associated with front heavy FWD layout designs. It does the job beautifully. Here is a great link with more info.

http://www.lancerregister.com/faq/G04/g04.html

 

This is not true, you cannot disable yaw control. Pressing the button once takes away traction control via throttle cut, holding the button for 3 seconds eliminates the braking vehicle stability control as well as traction control. AYC/ACD control are always active.

 

You are right, my mistake and a result of my not reading the post properly.

 

http://www.youtube.com/watch?v=00Yi3S8Nfxc

 

That's very close, but a bit misleading.

When you tap the button (i.e., plain off mode), you have turned off the throttle-cut traction control and you have turned off the single-wheel braking traction control (which is truly an anti-skid function, mostly dragging on the front wheels to counter over- and under-steer). When you hold it for three seconds (i.e., off-off or what some call "fully off"), you have also turned off the braking help for the AYC. This is why some people talking about off-off as being an AYC-related function.

As to how the AYC works: The rear diff has two extra outputs wrapped around the right rear axle. One is geared to turn faster than the diff's carrier; the other is geared to turn slower. To produce yaw to the left, a hydraulic clutch engages between the faster extra and the right axle. Via the diff, itself, this also slows the left axle. To produce yaw to the right, a separate hydraulic clutch engages between the slower extra and the right axle. Via the diff, again, this also speeds up the left axle. In order for this to work, the diff, itself, is open.

But that's not all of it. To further help produce yaw, brakes are applied to the rear wheel that the AYC is trying to turn slower. In other words, when the faster-turning extra is being linked to the right rear axle to produce yaw to the left, the left rear brakes are also being applied. When you put the ASC in off-off, this braking help for yaw is turned off.

The point of having off and off-off as options is that it allows you to (a) get rid of the traditional traction-control stuff if you happen to not need help driving on slippery surfaces [plain off] and (b) get rid of all funky braking functions if you don't want the car to use the brakes without your permission [off-off].

Of course, to most actual Evo owners, these aren't off and off-off. They are counter-steer drifting and steer-ahead-really-drifting.

As stating in other posts, neither setting affects the clutch functions of the ACD or AYC.