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Old 03-01-2007, 11:24 AM   #1
ViperJ
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99 C5 Vette, 475+WHP

Default Wow... STi In Snow

All I have to say is wow. Back in January when we had the bad weather I had my Trans Am with proxes 4 on it (also high performace summer tires). AWD is sooooo much better in the snow even with the stock tires, I love my scooby .

Oh and the center diff controll is awsome, rwd when having fun...
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Old 03-01-2007, 11:47 AM   #2
Matt92530
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You should still change out those stockers with a winter tire.
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Old 03-01-2007, 12:30 PM   #3
JRach
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Quote:
Originally Posted by Matt92530 View Post
You should still change out those stockers with a winter tire.

+1

Good snow tires + AWD = Mountain Goat!
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Old 03-01-2007, 12:31 PM   #4
Cooter05WRX
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yeah stockers are ok in the snow until you really need to stop.
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Old 03-01-2007, 12:52 PM   #5
ViperJ
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Default

I know they aren't great in the snow but I was very impressed by the AWD. I wonder how much more snow we will have this year...
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Old 03-01-2007, 01:31 PM   #6
Rootus
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As long as they have good tread, the RE070's aren't the end of the world if you get stuck with a dusting of snow. Just be damn careful and slow down, because they are about as bad of a snow tire as you could put on this car without resorting to drag radials .
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Old 03-01-2007, 01:34 PM   #7
MtnGoat
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Quote:
Originally Posted by JRach View Post
+1

Good snow tires + AWD = Mountain Goat!
Take it from the Goat!!

+1 on snow tires
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Old 03-01-2007, 01:35 PM   #8
j2los
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You cannot make it RWD with the DCCD. That's not what it does.
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Old 03-01-2007, 01:56 PM   #9
twofourzero
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I was kindof hoping for snow in the south-end but noooooo. Maybe I'll get to play in the snow next year.
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Old 03-01-2007, 02:47 PM   #10
ViperJ
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Well I guess not full rwd but you know what I am saying, most of the power at the back tires
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Old 03-01-2007, 03:03 PM   #11
STirocket
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I ran my DCCD in full lock mode, it was GREAT! Just wish we had more snow. I guess there is still some hope...
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Old 03-01-2007, 03:21 PM   #12
j2los
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Quote:
Originally Posted by ViperJ View Post
Well I guess not full rwd but you know what I am saying, most of the power at the back tires
It doesn't work like that. It transfers torque under slip and the DCCD only determines how much torque is transfered under slip. And that applies to any wheels slipping. You can't force more power to the rear wheels.

By moving your DCCD all the way down you are reducing your center differential to only 10% lock and that's it.
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Old 03-01-2007, 05:09 PM   #13
supermarkus
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Actually, all the way down should be open, so the DCCD isn't applying any lock. In the 04-05 cars no lock acts like an open center diff with a 35:65 torque split. In the 06+ I believe they have a mechanical center diff with a different torque split along with the DCCD so they do not behave like the earlier centers and act faster than with the DCCD alone.
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Old 03-01-2007, 05:22 PM   #14
j2los
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WRB

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I thought you couldn't do fully open just 10%, I might be wrong on that though.
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Old 03-01-2007, 05:25 PM   #15
TicketsForMePlease
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04-05's do up to 65/35, and everything in between to my knowldge... i.e. 65 front 35 back to 65 back 35 front, or at least thats how i interprited it
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Old 03-01-2007, 05:35 PM   #16
j2los
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WRB

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Quote:
Originally Posted by TicketsForMePlease View Post
04-05's do up to 65/35, and everything in between to my knowldge... i.e. 65 front 35 back to 65 back 35 front, or at least thats how i interprited it
No, this is the same functionality the OP is talking about and that is not how it works. The DCCD is very misunderstood. The 04/05 has a 35:65 torque split, yes. The DCCD determines how much of that torque can be transfered between the front and rear under wheel slipping conditions. The math behind what torque goes where depends on the 35:65 ratio, the % of lock and how much torque causes the initial slip. I cannot explain this easily nor do I fully understand the real world implications, but I can tell you this:

The DCCD does NOT allow you to directly change the torque split and you cannot control where it goes. Torque is transfered only when a tire slips and changes to the DCCD only determine how much is transfered, not where.

Sorry for the redundancy, it's just unfortunate that some people think that they can make their STi "mostly" RWD or "mostly" FWD when that's not actually what's going on. I used to think this too and I'm not sure why, but damn whoever gave us all the impression that's how it worked.

Last edited by j2los; 03-01-2007 at 05:43 PM.
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Old 03-01-2007, 05:44 PM   #17
Rootus
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Quote:
Originally Posted by j2los View Post
Torque is transfered only when a tire slips and changes to the DCCD only determine how much is transfered, not where.
Slightly more correct would be to say that the DCCD only transfers torque when there is a difference in speed between the front and rear output shafts. This does not just happen when tires are slipping, it also happens every time the car turns. On the 06/07 STI (since the OP has an '07), the DCCD controls lockup between 30-100%. The first 30% is a separate clutch-type LSD. The 06+ STI cannot go 100% open. Also, the torque split was slightly modified to 41/59. Torque distribution can be anywhere from 0-100% at any wheel depending on conditions.

DCCD and differentials in general are very much misunderstood. There are a few good threads on NASIOC that describe them, and a whole bunch of crap ones. Research carefully.

Dave
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Old 03-01-2007, 05:55 PM   #18
j2los
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WRB

Default

Yes, thanks Rootus.

It may be of interest to some that you'll find for casual commute type driving (in dry weather) it may make for a more comfortable ride to put your DCCD as far unlocked as possible, especially if your commute involves any sharp or hairpin turns, like mine does. Maybe the 06/07 differential feels a little better, but in my STi whatever lock the AUTO setting has dialed in around certain turns makes the car jerk and shudder a bit.

Other than this and using full lock to get unstuck in deep snow, I have not found any other real world usefulness for taking the DCCD off of AUTO.
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Old 03-01-2007, 05:56 PM   #19
WebMasterP
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This may be of help to those interested in understanding the DCCD.

http://wallace.as.arizona.edu/~cgrop.../DCCD_FAQ.html
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Old 03-01-2007, 06:34 PM   #20
TicketsForMePlease
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All that can be known for certain,
is when i leave it in auto, i do Axle spins, and when i put full rear
i do more of a doughnut
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Old 03-01-2007, 07:04 PM   #21
j2los
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WRB

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Quote:
Originally Posted by TicketsForMePlease View Post
All that can be known for certain,
is when i leave it in auto, i do Axle spins, and when i put full rear
i do more of a doughnut
You know how when you drive a FWD car with an open diff and you break traction one tire spins and the other stays mostly still? With your DCCD all the way down (unlocked), your front axle is the still tire and your rear axle is the spinning tire, thus doughnuts.

In AUTO or any other setting all the way up to full lock, both axles are getting at least some percentage of their torque, allowing you to do more of an axle spin like you say.
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