Can someone tell me what would be involved in modifying the 03 Evo to include the ACD from the new 05s?

 

Why would u want one. I have talked to several STI guys they never touch the damn thing.

 

cuz people always want wat they cant have or never appreciate wat they got

 

Well, easily put, A LOT!!! It's a very complex system, using this as inputs:

4 wheel speeds
G force both lateral and longitudinal
Throttle position – a variable value
Braking state - on or off
Steering angle – neutral position (straight ahead) and off centre position provided by 3 optical inputs generated by rotation of the steering wheel.
Handbrake state – on or off
System pressure – Hydraulic pressure state
Mode switch state – to select Gravel, Snow or Asphalt software strategy (maps)

Then you would need the center diff it self, ECU, mode switch, all the sensors, all the cabling etc. ect.

Here are some really nice info on the system and how it works:

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

http://www.btrprep.com/e7_qa.htm

I would say that after fitting this to a non ACD car is almost impossible.

 

STI?? Never heard of one with ACD? And why you would want one, maybe you should read the links I provided above? Or just read this quote:

"The system is technically far superior to the preceding Evo models VC centre differential systems. The centre differential performing well and able to limit front to rear axle “slip” on full throttle to a mean of around 0.6% on a slippery gravel surface. To put this in perspective, a good condition VC unit on a Evo 4,5 or 6 would struggle to be better than 30% aggregate slip value, which is traction going out of the window. Pressure can be introduced and lost within the ACD system at speeds surprisingly close to WRC car standards, which has allowed Mitsubishi engineers to use a complex and sophisticated software control strategy."

 

STi has DCCD, basically Subaru's version of acd.

 

Ok, thought that were a much simpler thing not electronically controlled with a knob between the seats just shifting power between front and rear? Sorry, I might be totally out in the blue here, not looking that much into the Subaru's

Maybe a much to long and complicated abbreviation for just a simple thing though?

 

yeah I think it was a new option first offered with the '04 USDM STi. DCCD, if I remember correctly stands for Driver Controlled Center Differential.