[Pyrex]

Originally Posted by johnlude85

are you sure? ive wondered this for the longest time. i did this once in lock and never wanted to touch the dial ever again. it just made the most horrible clunking noise/feel ive ever heard/felt in my life lol. you can do normal every day driving and parking lot menuvering (SP?) just like it was in auto or what?

Yes, it is fine to drive on pavement with the diff open. Auto opens the diff when making tight turns anyway.

Originally Posted by ELD4AU6

I wonder why it acted so much different with the power all in the back?

Because you manually set the diff to open so the computer didn't compensate by applying lock to the differential when you lost traction.

[Pyrex]

Originally Posted by FujiApples

lock causes your diffs to set the torque even going to all the wheels, so when you make a turn on pavement, the diffs will clunk like crazy. Only use lock on snow, gravel, or dirt.

The DCCD only controls the center diff. The front and rear diffs are limited slip no matter how you have the center diff set. When you set the center diff to lock it does not allow any slip between the front and rear. The torque split stays constant because it controlled by gearing.

[johnlude85]

[quote=Pyrex]Yes, it is fine to drive on pavement with the diff open. Auto opens the diff when making tight turns anyway.[quote]

so is there an advantage to using open on the street, or is it mostly used for the track? how is the power distributed to the wheels in open, 45 front and 65% rear? its noticed and heard that its best to leave it in auto, but if leaving it in open on the street (every once in a while i like to hear a little rubber burn, so sometimes i launch at a stop light from 1st to 2nd) will that be better for the car then leaving it in auto allowing the rears to break loose a bit easier then trying to store all the energy in the axles? sorry for all the questions, ive just always meant to ask and never have.

[Pyrex]

Originally Posted by johnlude85

so is there an advantage to using open on the street, or is it mostly used for the track? how is the power distributed to the wheels in open, 45 front and 65% rear? its noticed and heard that its best to leave it in auto, but if leaving it in open on the street (every once in a while i like to hear a little rubber burn, so sometimes i launch at a stop light from 1st to 2nd) will that be better for the car then leaving it in auto allowing the rears to break loose a bit easier then trying to store all the energy in the axles? sorry for all the questions, ive just always meant to ask and never have.

I usually only use it at the track if I'm having understeer issues or if I want to have some fun. It makes no difference until you loose traction.<o></o>
<o></o>
The torque split is always the same no matter how you have the diff set, the amount of slip that is allowed between the front and rear is what changes. The 04-05s are 35f/65r, the 06-07s are 41f/59r iirc. <o></o>
<o></o>
If you are launching hard enough to break loose you will probably break something sooner or later, but my guess would be if you allow the power to exit through the rears breaking loose instead of letting the transmission, differentials, and axels take it all, is probably better.<o></o>

[johnlude85]

subaru should have made another notch below open diff that would disable the front axles leaving it completely rwd. that would make an awesome consumer car, the ULTIMATE consumer car imo. the skylines have that option, i wish the STi,s did too.

[fxjeffrey]

so "open" means as much power to the back wheels as possible?
what is best to do in snow..50/50 or auto??

[LOLSTi]

Originally Posted by fxjeffrey

so "open" means as much power to the back wheels as possible?
what is best to do in snow..50/50 or auto??

What year is your STi?

Open means that the center differential is not applying any clamping force. On 04/05 STis 65 percent of the torque is routed throught the rear wheels. However, the DCCD setting is more of a suggestion than an abolute.

[o2sys]

i put it in open when it rains, heck i have it opened most of the times, very fun, rear wheel drive charaterictics with AWD traction FTW...also arent these f/r percentages only intial torque percentages???

[fxjeffrey]

i have an 07 limited...
now imagine im a moron and if you can explain what you mean by "clamping down" and again, does open mean you have swithed to rwd as much as possible?
im just not getting this whole dccd concept

[bigJP]

so if i wanted to do a tornado, a donut but start sitting still so the car doesnt actually move, it just spins like a monster truck, what would be the best setting to have it on?

[LOLSTi]

Originally Posted by bigJP

so if i wanted to do a tornado, a donut but start sitting still so the car doesnt actually move, it just spins like a monster truck, what would be the best setting to have it on?

Open/all the way back.

Try not to do this too much on dry pavement, and make sure not to crank your wheel all the way when you do. Not only is it unnecessary, but STi have very weak power steering pumps, and you will blow it up.

[JiveMasterT]

For those of you who don't understand DCCD at all or need a better understanding, here is the link for you...

http://wallace.as.arizona.edu/~cgrop.../DCCD_FAQ.html

BTW, the 07 STis have a 45/55 split so that means less of a torque split to the rear for us

[STi_4_Daddy]

Originally Posted by JiveMasterT

For those of you who don't understand DCCD at all or need a better understanding, here is the link for you...

http://wallace.as.arizona.edu/~cgrop.../DCCD_FAQ.html

BTW, the 07 STis have a 45/55 split so that means less of a torque split to the rear for us

oohhhh Yeah great reading... ^^

[flatthump]

Originally Posted by LOLSTi

driver error.

Werd..

[flatthump]

I am almost always in open mode at the track. But definitely not auto-x'n.