DCCD/better diffs

Rally

Rally

Forum Member
Joined
Jul 11, 2008
Messages
3,928
Location
Sydney
Car Year
1999
Car Model
WRX
Transmission
6 Speed
Some of you may be aware that I have installed a DCCD on my Impreza. Because my car was not equipped from the factory with a DCCD, it has no DCCD controller. The advice I had was to purchase a product from Canada called DCCD Pro to controll the DCCD.

The system gives you the option of auto or manual functions. For now, I'm leaving it on auto. What is interesting for offroad use is that in manual mode, there is an adjustment knob which when turned fully clockwise locks up the centre diff. It means that the car will not turn around corners (say when doing a u-turn) and will let you know with some substantial clunks if you try.

I know when you are on uneven terrain, the standard centre diff can let you down. WIth this set up, at least you will get power going front and rear.

With everything shut down over Christmas, I have been unable to take the car to get the exhaust modified or get a wheel alignment, but in the extremely limited testing I have done, the front and rear diffs (now both helical compared to the previous open front, VLSD rear) seem better able to get power to the ground. Unlike the centre diff, they are not adjustable and do not lock. But while not perfect, I suspect they would do a better job than what is currently on the Forester. When I have tried the car out a bit more, I'll re-assess how the diffs performs.
 
"DCCD" sounds like an AC/DC cover band! :lol:

"Driver Controlled Centre Diff" would certainly make a difference offroad as we've proved with the centre diff lock on the autos. Maybe we need to throw a lift under Rally's Impreza and get it out in the bush for some rock crawling. :iconwink:
 
MMmmn. Think I'd rather swap drivetrains than perform that exercise.:). But if I can simulate something similar then I'll let you know. Also, seems I was mistaken about the rear diff. Apparently it is a plated diff, not a helical. Front is helical as I thought.

Still, based on Kevin's post- who wants to be the first to put a DCCD (5 or 6 speed), plated rear diff (R160 or R180), helical (or plated) front diff in their Forrie or Outback and do some rock hopping? My money tree is bare at present after the Impreza conversion and trip to Europe, so the Forrie will have to wait. Or has someone already done it?
 
Standard MY08 STI. You can upgrade the front diff to plated, but they can be noisy- especially some brands. I'm happy though with the helical so far. I'm hoping the workshops are open tomorrow so I can fix the exhaust and wheel alignment. It's a fairly thorough conversion- and not cheap- especially when you add in the cost of the brakes, driveshaft, tailshaft, clutch and flywheel. I did all this work myself (with some help from mates), so there are no labour costs for me (except exnaust and wheel alignment), and I had a mate who lent me his hoist for a month.
 
That looks pretty good- hopefully they are not noisy. There a number of 5 speed and R160 upgrades available. But the technology is now being poured into R180 so there is more to choose from. Which makes something like this pretty good. Only problem is that when you upgrade one part, it does show up the limitations of what remains.
 
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