Yes, I realize the level of difference between the systems. But, it could provide a primer for the group to discuss rather than all the current speculation.

 

i drove not factory AYC equipped car had no issue. /evo VI Rally N car./

 

I'd suggest taking a look here:
http://www.dsm.org/menu.epl?item=352

There are several topics from the good ol DSM archives that will never age.

There's no AYC involved, but a good read to understanding for example, what happens when weight transfers from front to back, or left to right.

 

Not ture. Any car with more front weight distribution will understeer more. Will the S-AYC help reduce understeer substantially? Of course, but the more you move weight up front, the more understeer the car will be subjected to. Here's all the proof you need: One of the reasons for Mitsubishi moving some things into the back in the Evo X was to improve weight distribution and reduce understeer in the new chassis. Remember, only our Evo VIII and IX did not have S-AYC here in the USA, the Japanese and UK spec had latest generation S-AYC (before all wheel control) since 2003. The 2002 Evo VII AYC was a little less advanced.

I'm not directing this to anyone in particular, but I think the biggest problem with S-AYC discussion on evom are the comments and speculations from the peanut gallery aka those who have never used it. Until you have driven an S-AYC equipped Evo (with the ASC fully defeated) in very fast corners when the torque vectoring doing its thing at full potential.

As far as if the system is adaptive, of course it is! Look at all the modified Japanese spec VIIIs and IXs for proof. There was even an CT9A Evo Strikes Back video with some modified SAYC cars that were a lot faster than the other car that modified for rally use which did not have SAYC. The drivers of the cars traded wheel time and commented how the rally car would be faster with SAYC.

In short, SAYC is adaptive, but the more weight you pull out of the rear of the car without removing it from the front will help you in drag racing, but it will hinder then handling potential of the car.

 

Left-Right Torque Vectoring Technology
as the Core of Super All Wheel Control (S-AWC)

 

Thanks for the input Noise. I sort of posed this question for conversation value mostly. I, and most everybody understands that when you have more weight over the front wheels it will be prone to more understeer... and vice versa if there is more weight towards the rear. We've noted that the new Evo X has been designed to have slight oversteer via the S-AYC system. That's where I figured that if some weight is removed from the rear, that the system will have less rear weight to work with and thus move towards a neutral cornering behavior. Then the limits of the S-AYC will come to play... if there are any.

It's a complex system that I really appreciate. I hope that we can get some first hand european/japanese input from drivers that have driven the older AYC equipped Evos... instead of the brand new speculators.

I agree that it is adaptive. I guess we will see some first hand results on the 29th.

 

I'll throw in my 2-cent speculation as well...seeing as how mitsubishi engineers aren't likely to chime in. the aids only kick in when the natural abilities of the car aren't performing optimally. if you destroy the weight bias and create a plow-happy car, the system has to work that much harder to keep you going where your steering wheel is pointed. you may or may not notice a difference because the system will probably mask the problem, but i could see increased wear over time as the system tries to correct for the bad bias. however, i don't think most people will use the systems enough to notice. what i DON'T think is that the system is restricted by the changes such that it would malfunction. it CAN'T be. there are too many variables in the real world for a system to operate like that. likely, it will just notice the car is plowing, and vector torque and grab rotors to get you back on track. it will likely use as much force as necessary to produce the desired result. in other words, it knows you are plowing, regardless of why. it also knows it should apply as much force as necessary to correct the yaw rate to what it should be. of course it has an absolute limit to how much help it can give, but i highly doubt it would just give up and hit limp home mode...

 

i dont think the weight differnece will be the major issue. I think the WHP gain and the suspension geometry change, and behavior via swaybars etc. will be more influence on it, Or the brake system changes. IF...

well i drove evos in hungary /europe for some /on events. Those had no issues . Compere to them, is not fair comparison since the S-AWC is way more advanced.
In that matter the S-AYC is way less then this new technology.

the mitsu really started a new tecnology with this car. Both on the engine and the drivetrain.

 

By it's very definition, AYC is indeed "adaptive"...

...Being as this technology is based on so many real-time driving "conditions" -- speed, throttle position, steering angle, wheel slip (i.e. traction), and momentum (both accel/decelleration and side-side g-forces) -- vehicle weight is only ONE of the many factors AYC uses to work it's "magic".

Afterall, if AYC wasn't adaptive, having passengers (front and/or back) or even a heavy vs light driver, would throw off the system. Also, changing tires/wheels would throw the system off, if it wasn't adaptive. : )

That's my .02

 

Thanks and all ... but the question is about if S-AYC is adaptive. DSM cars, well all basic cars that have no dedicated active yaw control are kind of another topic. Hell, we could talk about shifter karts with some off of that info. Karts have no yaw control system whatsoever. But they are fun as hell.

That info you linked are part of the basics that go into the design of an electronically commanded yaw control system... not whether or not the computer can cope with different variables. That's what we would like to dig deeper into... and then if the computer likes to have more or less weight in the front or rear.

 

that is true but wasnt too much issue, since the AYC wasnt that advanced then the S-AWC today.
and also the new softwere maybe tolerate the different wheels and tires size better

 

Yeah the word adaptive is really the best way to describe it...it's just like any other electronic aid after you've done some mods, like ABS, in the aspect that if you upgrade your rims or tires it's still going to help slow you down. I'm speaking from experience, I had AYC on my old Evo 4 and despite the mods I did (coilovers, rims, etc) the system still worked just the same as it did when the car was stock. I'm not sure if it's the same on the X, but I remember when I used to really push the car hard through turns and bends you could literally hear the system working as it tried to distribute the torque in the rear. Maybe that was an early bug, can anyone confirm for the X?

 

I bet those different variables are the biggest variables for the system to deal with too. But, if it's all based off of the accelerometer inputs, then it may just provide the right amout of output on that left/right/front/rear brake or diff to get the desired result. That would be some genious design/programming... especially for a tuner car. I'm just speculating too.

 

if you think about it, it would actually be MORE difficult to taylor such a system to the physical layout of the vehicle. you would need to model the entire car in a virtual way inside the computer and then calculate every effect on it in every driving situation. the ECU would need to be a super computer! it is much simpler to only take into account the difference between intent (steering angle, throttle position) and effect (acceleration, yaw rate, wheel slip) and apply force to make up for the difference. this way, it doesn't matter what vehicle it goes on, or how the car is loaded up.
it just helps to accomplish the driver's wishes...like a genie...

 

AYC doesn't have to be adaptive to vehicle weight, it works the same (albeit at different thresholds) depending on how many people are seated in the car.

There's only a few variables it needs to work, and all those sensors depend on yaw movement, grip, and other junk from the ECU. Weight does not affect AYC directly. Only indirectly or secondarily.