im looking for a detailed description of exactly how the dccd system works on the my 05 sti.

The instructions in the manual are pretty poor. For example. it doesnt even mention that you need to turn the dial while the car is stationary for it to work.

full lock i know is 50:50 torque distribution, and right back (full green) is 36:65 front rear for more tail happy progress.

 

For a classic but should apply
http://bbs.scoobynet.co.uk/showthread.php?t=143750

 

I've read the thread before and others and found that the best thing to do is have a play with it in the damp

I've found that a half way setting made the car feel more tight and agressive......if that makes any sense !

Although I nearly crapped myslf doing a three point turn with the diffs locked - the transmission noise was so loud iI thought I'd wrecked my two month old car

 

iirc the DCCD should be adjusted whilst moving not when stationary

 

peter

full forward isn't actually 50:50. Full forward is theoretically fully locked (depending on the grip level you have it might not actually be fully locked, but that's a different matter), which means that torque will be transfered proportionally to the grip level front and rear.

In other words, if the rear is on sheet ice and the front it on dry tarmac, you'd end up with pretty much 100% of the torque at the front and 0 at the rear.

In the open position, the torque split is static though, so you don't get the torque moving around like you do when its locked.

The settings in-between make this more difficult to understand, in that the more you move the dial forward, the more you reduce the difference in basic torque split, but also, the more dynamic you make the torque split, meaning torque will be transfered slightly more towards the end with the most grip.

Confused yet?

As stated, the best thing to do is to have a play in a safe environment. All of the science means nothing unless you use it to make the car perform better. So find somewhere big and open and have fun

Simon

 

does it make a huge difference to the driving experience to the average driver?

 

In the wet, full back it certainly makes a difference to the 'average' driver yes

 

Agree with james. I think it makes more of a difference than people generally realise. On the limit, it transforms the handling of the car, and its when you're on or near the limit that these things matter the most