I was wondering about the Skyline R34 and it's Attessa-ETS system, which electronically distributes the torque between the front and rear wheels, but instead of 50:50, it normally emulates an FR car until the torque is needed up front. Should Mitsi make this an option for the EVO? After all, if the ACD is controlled by a program, surely it wouldn't be hard for a tuner to come up with a hack in the same way the ECU has been altered? So want to go fast on the track, set it up as it comes from the factory. Want to do classic drifting? Download the latest from your fav tuner.

 

I wouldn't hold your breath we are yet to even see a ACD here in the states. Let alone one that you can program.

edit: Foot in mouth LOL https://www.evolutionm.net/forums/sh...threadid=73516

BEN

 

now would that make the evo affordable? no... i believe the evo as a whole is such a bang for the buck...once it hits $40k (which it will with such a system).... your now competing with top dogs and you dont have such a big price advantage anymore

 

The stock AWD ECUs (including the Ralliart K1 and K2) are not user programmable. As far as i know the programs are in ROM not EPROM.

GEMS makes a unit that can be user programmed, but you have to know EXACTLY what you are doing....

 

Some very interesting reading on this subject:

http://www.btrprep.com/evo_7.htm

 

Our torque split is a constant 50:50 as defined by the gearing... what changes is the locking force of the acd clutch and the duration of such lock and when it is applied.

Tarmac : Highest potential locking force... but usually present in braking and straight line accel. Diff releases instantly on turn in (when g-load and steering inputs are detected)

Gravel : Medium force : diff stays locked a few seconds longer on turn in

Snow : Lowest level locking force..... but maintains that lock for up to 5-8s after turn in.

 

Here is a screenshot from the Ralliart cluster that gives an insight into the friction levels:

 

I'll say. So MR has produced different chips to control the ACD. It can be done. Now we just have to have a version with ACD AYC over here to start tinkering with.