I'm respectfully going to disagree with you on that.

ESP corrects attitude by grabbing a brake on a specific corner or killing engine power and is aimed at limiting oversteer not creating it. Either one slows you down.

SAYC and ACD transfer power to different wheels to correct the cars attitude without ever using the brakes or decreasing engine power and will actually get the car to rotate better. This would definitely be a big help in controlling the Evo's natural tendency to understeer with out slowing you down to do it. It functions as closely as a WRC cars diffs as we currently get and I don't think there is any argument as to their effectiveness. Pretty much everything I've read says SAYC is almost seemless and very hard to pick up on the car making adjustments.

I would have to say that SAYC equipped cars are going to be consistently faster than non SAYC. The margin depends on the driving style, course, and conditions. Obviously if someone knows how to drive an Evo well the margin will be smaller than someone who is a novice.

 

I have never driven a car with SAYC so I don't know how imperceptible it is. If it is consistent and non-intrusive I agree it should be faster. I would argue that the implementation on a WRC car is likely very different than the massed produced version. I see and concede your point regarding braking vs. not braking. ESP can counter over or understeer, the main implementation as shown on their site being braking on the inside rear wheel in understeer conditions, and braking on the outside rear wheel in oversteer conditions. The engine cut-out is definitely a drawback.

 

The mechanicals on a WRC car and the level of technology are very different but, the idea is pretty much the same.

I have never heard of ESP countering understeer while accelerating. If you are understeering under braking that is one thing but, never under power have I heard of ESP countering understeer since it is generally regarded as the safer option vs. oversteer.

I guess the best way to think of it is Electronic Stability Protection is there to bail you out, keep the car stable and, protect you from sliding off the track backwards into the barriers.

SAYC is to help you go faster under control by adjusting the attitude of the car to be more neutral. It really is about the only program that tries to help you go faster instead of nannying you.

 

I have, and you'll be happy to know that it is! I had a JDM 97GVR4 for the past 2 years. The system is completely unobtrusive and consistent. The only feedback you get is a AYC gauge mounted in the cluster with 3 levels telling you how much you are pushing it (and your face plastered against the window). Believe me lighting up that 3rd gauge was hard, you had to be going stupid fast around a tight hairpin pulling massive G's.

One of the big reasons i'm waiting for the evoX is because of this system. AYC is mighty, seriously... test drive it when it's available, although it's not even feasible to put it to good use doing 50 around some boulevard. It improves upon the LSD by giving it electronic control, and it makes the outside REAR tire spin around corners, making very tight turns. It does not spin the outside front wheels as people believe, it is not possible because the AYC unit is built into the rear diff with wet clutches that transfer torque. Only con would be the maintenaince, there are 3 fluid tanks, one in trunk and other 2 at the diff every 4500 miles.

As for the guy who started the thread, the closest you might get to having them answered is watching "BMI Vol 7 - EVO Strikes Back." They go over everything about the system, why it was implemented and also have the VIII AYC vs. some ultimate track monster VII - I forget the details. (DrSmile go DL it! I know you liked the last one I recommended )

 

I have driven my SAYC-equipped Evo many many many times on road courses/tracks.

I can't feel the SAYC working, none of my friends could.

I am **guessing** that having SAYC will help shave lap times, by how much I really have no idea...

... but having said that, if you are really serious in tracking, you'd want to swap the rear LSD anyway. So if given a choice, I would buy an Evo WITHOUT SAYC and install the ATS carbon LSD.

In the wet is probably when I ***think*** I recognize the SAYC working, and it wasn't pretty... just when I thought I had the slide well under control, suddenly the rear 'jerked' in one direction. I reacted (with steering and throttle inputs), and again just when I thought I had the slide under control, same thing happened.

I could pull off quite a prolonged drift in the wet in the STi, but not in the Evo (at least not without constantly 'fighting').

So in conclusion, no SAYC for me thank you very much.

 

AYC is very useful most of all when used in a track. first off AYC was developed by mitsu to help relieve the understeer which is very common for awd cars making the car turn sharper. and because of this tire wear would decrease most of all for the front tires. and if you have lesser understeer you could apply power earlier as you exit an apex. too bad our usdm evo ix doesnt have this.

 

http://www.sportcompactcarweb.com/fe...ion/index.html ... Here's a good comparo between a JDM IX GSR w/ S-AYC and a JDM GT w/ 1.5 LSD. There's no mention of the driver's/writer's credentials, but he was floored by the brilliance of S-AYC. It's not a bad read. Enjoy.

 

Our cars in Australia come with all the electronic bells & whistles, AYC, Competitin ABS, etc.
Mine is an VIII, & I have upgraded the AYC ECU to a Ralliart Tarmac ECU for competition only, in a word it is BRILLIANT.
Where I live we run Timed Sprints on a Go-Kart Track about 1.2KLM in length with 9 corners, needless to say it is very tight, our main straight is only 297Ft long, so you get the picture.
The EVO's handle this track very well, the AYC is very stable under braking & acceleration, I find mine can be held on throttle oversteer, & trail braking very easily.
Driving the car on the track , there is no noticable transition when the AYC is operating, everything happens seamlessly, the ABS kicks in on the verge of each corner, kicks twice, then its on the power, tail rotates very smoothly, car tracks through the corner, no problem, even hitting ripple strips doesn't throw the car off-line, it is all very controlled.
The main competition is a 600HP Nissan R34 Skyline, & we are within 1-2 seconds of him per lap, & our cars would have 240-250 HP, in fact a buddy of mine runs a TME VI & he is tied for 1st place with the Nissan.

 

FIA regulation does not permit AYC on production race car and the WRC cars are not using "electronic dif" anymore since 2007 championship. It was faster before...
The same on stock car, Mitsu S-AYC computer does not think for the driver but just help him and EVO is the only car with a performance thinked computer VS all security stuffs like ESP, and more...
It's not a matter of who drives and how, it's just physical, the more power you send on ext side the more speed you can apply on curves cause it' just helps you to turn!.
I love my MR but I honestly wish it to have SAYC...

 

I've driven a German market Evo VI--TME with AYC. Compared to my US market Evo VIII without AYC (obviously), the Evo VI was MUCH easier to drive at the limit.

You can basically drive into a corner far hotter than you should. Rather than understeering off the road and scrubbing speed like crazy, the car just turns right into the corner. You basically don't have to do anything.

It takes a LOT of getting used to. If you countersteer, you screw everything up. You need to just keep the wheel turned in and hang on. Very weird.

Personally, I wasn't crazy about it. But it's definitely quick. I have no doubt the vast majority of drivers ouwld be far quicker with AYC than without. If you've got teh skill to balance a car at the limit, then I don't see it making much of a difference one way or the other.

Emre

 

It really depends on the driver. If the "same skilled driver" is relatively low skilled, the AYC car will be quicker. If the "same skilled driver" is relatively highly skilled, there won't be much of a difference. In fact, the highly skilled driver would probably find AYC distracting/annoying/useless.

Emre

 

damnit. I wanted to ibtw but i was too late

 

my uk 8 has s-ayc and i like it, recently had my suspension setup properly and really getting used to the ayc.

the way i have it now is basically like this..... take a corner as fast as you want, turn in, keep foot planted, it will take you where you want it to

heres the weird bit.... DON'T lift off or the car just looses all balance and the ayc system works against you instead of with you

keep your foot planted and its all good

its all dependant on your driver style but i reckon most would prefer ayc especially if they drive their evo's on a lot of varying surfaces quickly

only downside is the rear ayc diffs cant take a lot of power, usually looking at RS diff setups at anthything over 400whp