STI driver controlled center diff question >

[chantSTI]

Just got an STI > Soooooooooo sweet!

 

When I activate the DCCD, It has something like 6 positions > and a "locked" position too.

 

Can someone tell me how to use this thing?? I get the general idea but some advise would be really cool >

 

What is happening when the lock is activated and where is the power curve from 50/50 etc.

 

Also, If I have the DCCD engaged at low speeds, like pulling next to a gas pump or reverse and turn the car it makes some funky grinding noise > Is this normal????

 

Thanks!

[RallyKeith]

  chantSTI said:

Just got an STI > Soooooooooo sweet!

 

When I activate the DCCD, It has something like 6 positions > and a "locked" position too.

 

Can someone tell me how to use this thing?? I get the general idea but some advise would be really cool >

 

What is happening when the lock is activated and where is the power curve from 50/50 etc.

 

Also, If I have the DCCD engaged at low speeds, like pulling next to a gas pump or reverse and turn the car it makes some funky grinding noise > Is this normal????

 

Thanks!

 

The STi's center diff is actually an open diff with an electronic clutch pack that locks it up to varying degrees. Also, the diff is geared to a 35/65 power split. What that means to you is that the car is not like any AWD Manual Subaru ever offered in the states. In Auto Mode the diff is open and as it senses wheel slip it begins to lock up the diff via the electronic clutch pak. When it locks it up it does just that, lock it up. It DOES NOT transfer all the power "to the wheels that grip." The Driver control just allows you to controll the amount of lock up, basically from 0% (diff free) to 100% (Locked.) In theory with the car in Free mode it will act as close to a RWD car as you can get.

 

My advice on how to use it is not to worry about it, and don't bother with it in daily driving. I've been autocrossing mine since shortly after I got it and it is by far best to leave it in Auto mode. If you are playing around, like pulling out from a stop sign in the rain with no one around, then play around. Locking the diff will make the car GO, while putting it in free mode will create lots of rear wheel spin. It's a cool feature, but in reality letting the computer do it's thing is fine.

 

Keith