version 5-version 8 DCCD changes?

[Lachlan]

I don't imagine I'd ever use the manual part of a DCCD tranny, but I read comments on how the computer is wonderful getting you through a turn. I'm wanting to put in a ver 5/6 R/RA tranny w/ DCCD. My question is, will I get the same kick-in-the-pants corner-eating technology with a version 5 DCCD brain that these guys experience with the usdm model?

* Registered users of the site do not see these ads.

[jesse370]

Well in a way yes and no. The auto feature in the ver8 sti varies the dccd lock up based on wheel speed, throttle input, abs input etc....So that you can go from 0 lock into the corner and have the auto roll into the lock to help pull the car through a corner. I've read on scoobynet that guys like john F from the uk will adjust the dccd manually on the fly so in that regard you can still do it, Just not as fast and you will have one hand on the wheel once in a while.

[Lachlan]

Well I was hoping that the computer could do it for me. I don't really trust myself to take care of that.

[LVSUBARU]

The version 8 DCCD computer comunicates with the ABS computer, and the engine ECU to preform the auto mode. So any other versions do not have an auto function. The only way you can get an auto function is by doing a very extensive version 8 swap with all the before mentioned modules.

[Lachlan]

Ok, I was under the impression that the previous models had an auto feature too. If not then there's really no point in getting a DCCD tranny (for me anyway). So if earlier models didn't have an auto setting, how did they perform on tarmac?

[LVSUBARU]

They either adjusted it manually on the fly, or set it to a RWD bias.

[kgb]

Until V8, DCCD was strictly manual with EBrake/Brake input (so that the center diff would be open under any braking). V8 onwards come with an Auto mode, which from the wiring diagram, only need a few extra sensor and some signals that should be available in older cars. I might be wrong but from the diagram, if you have the right parts and mount the sensor in the right place, you could technically make the V8 DCCD controller work with any DCCD tranny.

[jesse370]

You would need the whole ver8 harness, you have the actual dccd module and then something in the main ecu controls the auto logic I guess you could say...But you would need abs sensors, throttle position sensor, g sensor, rear diff temp sensor..etc......

Lachlan...as for your questions as to how the car handles on tarmac with a manual dccd...My guess would be incredibly well...The uk guys I have talked to rave about it. On dry days that you want to misbehave just set it to open and go have fun, on more slippery days or when you want a little more control go up a few clicks...And when it gets really slick go to full lock. I have been reading that the guys with that dccd say it is like second nature changing the setting on the fly...I mean you hand is close enough in between gear changes....But they have the help of a little display showing what setting they are in...

On a side note the car is being dropped off tomorrow morning at rallispec...Dave will start surgery monday. I will post back on my feelings on the dccd when I get the car late tueday....

[kgb]

Having the V8 harness would be nice, but I thought that everything the V8 DCCD controller needs can be tapped off the main ECU wires, and for the sensors that don't exist, wire them?

[jesse370]

Yeah but you would still need the ecu and dccd module, and I was told the G sensor is expensive too...It is probably possible...I doubt it is very practical.

[kgb]

If the G sensor is expensive, so be it - DCCD module yes, ECM? As long as the signals are there, you can keep whatever ECM you have