[mtskibum16]

I feel that it is very easy to control the car at the limits with DCCD in full open. Just takes some practice to be comfortable with it.

[JAYMAC10]

No one has really mentioned if they drive with the DCCD set to 1 click behind "lock"! Like almost fully forward....

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

How do you get to read step 2 and 3 in this?

Thanks,

Jay

[wdb]

Originally Posted by JiveMasterT

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

Can you point me to a definitive cite for that please, thanks.

Originally Posted by jaydow11

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

How do you get to read step 2 and 3 in this?

You don't. They don't exist. I contacted the author and his best suggestion was to use the Subaru Technical Manual if you want more specifics.

[JiveMasterT]

Originally Posted by wdb

Can you point me to a definitive cite for that please, thanks.

I don't have one at the moment because I'm uhhh...

anyway, they switched to a torsen rear diff in the 07 so it must have something to do with that. I originally found this info posted on Nasioc and if I get a chance later I'll dig up the info for you.

[JustinH]

^ i think hes right; i was reading and the torque split was changed from 06 to 07 =/

[Matt30]

Originally Posted by 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???

The gearing doesn't change, without any limited slip action, the numbers represent the amount of torque transmitted to the ground at any RPM, in any gear, with any amount of traction.

[JiveMasterT]

Originally Posted by JustinH

^ i think hes right; i was reading and the torque split was changed from 06 to 07 =/

Yeah I read it somewhere else too, but Subaru recently updated their site to say:

Driver Controlled Center Differential (DCCD) All-Wheel Drive: Exclusive to WRX STI models, Driver Controlled Center Differential (DCCD) All-Wheel Drive, featuring both manual and automatic modes, uses an electronically managed multiplate transfer clutch and a mechanical limited-slip differential in conjunction with a planetary gear-type center differential to control power distribution between the front and rear wheels. Normally, DCCD splits power 41% front and 59% rear. Sensors monitor parameters such as wheel slippage, steering angle, throttle position and braking to help determine torque distribution and direct it to the wheels with optimum traction. DCCD also features a helical-type limited-slip front differential and a Torsen® limited-slip rear differential.

So I was wrong... it's a 41/59 split rather than a 45/55 split that I originally stated. Sorry about that. It definitely isn't as cool as the 35/65 split that was in the 04-06 STi. I guess this means it will be harder to do donuts now

[JustinH]

wait a sec^ ; so when its in "open" or putting the dial all the way back, the max that goes to the rear is only 55?

[karr1008]

Originally Posted by JiveMasterT

Yeah I read it somewhere else too, but Subaru recently updated their site to say:

So I was wrong... it's a 41/59 split rather than a 45/55 split that I originally stated. Sorry about that. It definitely isn't as cool as the 35/65 split that was in the 04-06 STi. I guess this means it will be harder to do donuts now

So, are the 06 35/65 split as well or was it only on 04-05 model STI's?

[elirentz]

The 06's are 41/59 just like the 07's. Its the 04's and 05's that have the 35/65 percent split. These are the inital splits that are gradually increased/reduced to 50/50 at full lock by either the computer or you. That's why at more aggressive manual settings you get the grinding noises when making tight turns, because the center diff. is trying to resist the differences in wheel movement.

I like to occasionally try the dccd in one up from full rear, there the split is still pretty much full rear but the diff isn't fully open. But auto is still always faster for me.

[JiveMasterT]

Originally Posted by elirentz

The 06's are 41/59 just like the 07's. Its the 04's and 05's that have the 35/65 percent split. These are the inital splits that are gradually increased/reduced to 50/50 at full lock by either the computer or you. That's why at more aggressive manual settings you get the grinding noises when making tight turns, because the center diff. is trying to resist the differences in wheel movement.

I like to occasionally try the dccd in one up from full rear, there the split is still pretty much full rear but the diff isn't fully open. But auto is still always faster for me.

I'm pretty sure they 06 has the 35/65 just like the older ones. There were a lot of changes in 07 like the downgrade of various suspension bits as well as no additional caster, which in turn shortened the wheel base a half an inch.

[karr1008]

Originally Posted by JiveMasterT

I'm pretty sure they 06 has the 35/65 just like the older ones. There were a lot of changes in 07 like the downgrade of various suspension bits as well as no additional caster, which in turn shortened the wheel base a half an inch.

Well, now I am confused. Which one is it for the 06 Year?

[JiveMasterT]

Originally Posted by karr1008

Well, now I am confused. Which one is it for the 06 Year?

Yeah like I said I'm pretty sure it was just changed in 07. If no one has a definitive answer I'll just shoot an email to SOA... they are usually pretty helpful with this stuff.

[JAYMAC10]

06 STI's are 41/59. One of the reasons Subaru increased it was to help reduce understeer!

[JiveMasterT]

Originally Posted by jaydow11

06 STI's are 41/59. One of the reasons Subaru increased it was to help reduce understeer!

Sorry but how would that reduce understeer? If you have more torque going to the front won't that increase the chance that they will spin under cornering and then cause you to understeer more?