STi V3 Viscous diff v DCCD centre diff
22 February 2012, 05:10 PM
#1
STi V3 Viscous diff v DCCD centre diff
Hi All,
I think I have got my head around the differences between these. Are the following correct.
STD Viscous unit is a 50/50 split front rear.
DCCD Unit is a 35/65 ish split front rear.
The DCCD unit maintains this 35/65 split despite what setting you set on the dial but allows more or less slip between the diffs. Ie it doesn't send more than 35% to the front but reduces the slip between the diffs.
Fingers crossed I have it right.
Why ? I have installed a DCCD unit in my V3 box for sprinting.
I think I have got my head around the differences between these. Are the following correct.
STD Viscous unit is a 50/50 split front rear.
DCCD Unit is a 35/65 ish split front rear.
The DCCD unit maintains this 35/65 split despite what setting you set on the dial but allows more or less slip between the diffs. Ie it doesn't send more than 35% to the front but reduces the slip between the diffs.
Fingers crossed I have it right.
Why ? I have installed a DCCD unit in my V3 box for sprinting.
22 February 2012, 05:36 PM
#2
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I thought DCCD could split front rear from fully open ( 36/65 f-r ) to locked ( 50/50 f-r )
More here http://driveperformance2.subaru.com/.../blueprint.asp
More here http://driveperformance2.subaru.com/.../blueprint.asp
Last edited by DT-SPD; 22 February 2012 at 05:38 PM.
22 February 2012, 09:48 PM
#3
I think you are both correct - in laymans terms.
Technically speaking, it the DCCD was fully locked and the rear wheels were on tarmac and the fronts were on ice, the split for torque would be more like 95% to the tarmac and 5% on the ice. But to my way of thinking, it would be 50:50.
I have a DCCD on my car and think it is a complete waste of time (ie just another thing to go wrong)- but each to his own I suppose.
Technically speaking, it the DCCD was fully locked and the rear wheels were on tarmac and the fronts were on ice, the split for torque would be more like 95% to the tarmac and 5% on the ice. But to my way of thinking, it would be 50:50.
I have a DCCD on my car and think it is a complete waste of time (ie just another thing to go wrong)- but each to his own I suppose.
Last edited by cster; 22 February 2012 at 09:49 PM.
22 February 2012, 10:02 PM
#4
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I think you are both correct - in laymans terms.
Technically speaking, it the DCCD was fully locked and the rear wheels were on tarmac and the fronts were on ice, the split for torque would be more like 95% to the tarmac and 5% on the ice. But to my way of thinking, it would be 50:50.
I have a DCCD on my car and think it is a complete waste of time (ie just another thing to go wrong)- but each to his own I suppose.
Technically speaking, it the DCCD was fully locked and the rear wheels were on tarmac and the fronts were on ice, the split for torque would be more like 95% to the tarmac and 5% on the ice. But to my way of thinking, it would be 50:50.
I have a DCCD on my car and think it is a complete waste of time (ie just another thing to go wrong)- but each to his own I suppose.
so in your mind, ...
a designer, engineer who though dccd on a road car is a good option was wrong ?
or was it indeed intended for road use ?
23 February 2012, 12:47 PM
#5
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the original op has it correct. the torque split remains the same. moving the dial controls the duty cycle of lock between axles just.
prodrive removed it from p1 for a reason.
prodrive removed it from p1 for a reason.
24 February 2012, 09:06 PM
#6
As far as I'm concerned, it is a bit of a gimmick, but others may have a different opinion.
25 February 2012, 09:05 AM
#7
dialing down the DCCD on the track definatley makes a difference in the dry, just keep it in auto in the wet. But maybe i notice it more due to having coilovers dialed up hard with ARBS, ALK and Strut braces. The DCCD definately helps to bring the rear around. But to be honest i tend to leave it in Auto, relying more on the mods above to to neutralize understeer
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25 February 2012, 06:21 PM
#11
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you`ll love it btw, for better turn in but a bit backend happy all the way back on the thumbwheel, for highspeed stuff i usually have it one notch forward
26 February 2012, 09:35 PM
#13
Perhaps my driving style is a little too old school (smooth) to derive much benefit.
Then again, maybe my one is buggerred
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