[Rev]

Originally Posted by flytojungho

can you change the setting of DCCD while driving?

Yes you can ... like someone said, don't change it while wheels are slipping or when traction conditions are changing ...

And, when doing low speed manuevers, like parking, slow U-turns, keep the DCCD in AUTO mode.

[Thejoyofdriving]

I am confused, i thought the DCCD changed the amount of power going to the front wheels, not the torque to the inside and outside wheels like a diff would.... if that makes any sense? I guess i thought it was to let the driver control the power to the front wheels essentially being able to make the car RWD and AWD, but apparently it also controls the rear and front diffs, like it says that if you put it on lock, you cant make tight turns well, which would have to do with locking the front and rear diff, and making them spin at the same rate, verses the locked position just making it so that the power to the front wheels and rear wheels is the same, which shouldnt cause a problem when making tight turns....someone help me?

[fry_ed]

in a tight turn the fronts and rears are traveling different distances, hence they *want* to spin at different rates, thus LOCK is bad for tight turns. DCCD does not say anything about right to left relative torque or velocities. That's what the LSD's are for

[wdb]

Originally Posted by Thejoyofdriving

I am confused, i thought the DCCD changed the amount of power going to the front wheels, not the torque to the inside and outside wheels like a diff would.... if that makes any sense? I guess i thought it was to let the driver control the power to the front wheels essentially being able to make the car RWD and AWD, but apparently it also controls the rear and front diffs, like it says that if you put it on lock, you cant make tight turns well, which would have to do with locking the front and rear diff, and making them spin at the same rate, verses the locked position just making it so that the power to the front wheels and rear wheels is the same, which shouldnt cause a problem when making tight turns....someone help me?

When making tight turns the rear of the car draws a smaller arc than the front of the car. The binding is front/rear, not side/side.

[supermarkus]

Originally Posted by Thejoyofdriving

...but apparently it also controls the rear and front diffs, like it says that if you put it on lock, you cant make tight turns well, which would have to do with locking the front and rear diff...

DCCD does not control front and rear diffs, Driver Controlled Center Differential. CENTER being the key word.

[Thejoyofdriving]

Originally Posted by fry_ed

in a tight turn the fronts and rears are traveling different distances, hence they *want* to spin at different rates, thus LOCK is bad for tight turns. DCCD does not say anything about right to left relative torque or velocities. That's what the 's are for

So i am correct in saying that moving the switch up and down changes how much power goes to the front wheels? With an there should be no problem turning since it allows both left and right wheels to turn at different rates.....so setting the center diff to lock only makes it so that the power transfer between the front and rear is fixed 50/50, but the left and right wheels are still on right???

[Wolverine 250R]

You have to think of it differently. Setting the DCCD to "Lock" forces the wheel speeds to be identical front and rear, not torque to be split 50/50. Up to100% torque will be sent either front or rear to keep the wheel speeds the same. The drivetrain binds while turning sharply with the DCCD in Lock due to the fact that the rear wheels take a tighter arc than the front and don't naturally spin at the same speed as the front. The center diff tries to force them to spin at the same speed and, as a result, the drivetrain binds.

[Thejoyofdriving]

Originally Posted by Wolverine 250R

You have to think of it differently. Setting the DCCD to "Lock" forces the wheel speeds to be identical front and rear, not torque to be split 50/50. Up to100% torque will be sent either front or rear to keep the wheel speeds the same. The drivetrain binds while turning sharply with the DCCD in Lock due to the fact that the rear wheels take a tighter arc than the front and don't naturally spin at the same speed as the front. The center diff tries to force them to spin at the same speed and, as a result, the drivetrain binds.

oh....ok i see! So when its on lock it forces the front and rear wheels to move at the same speed. What does having it all the way down do? is that the center diff open and the front and rear wheels can each spin at any rate they want? and half way???

[fry_ed]

Originally Posted by Thejoyofdriving

oh....ok i see! So when its on lock it forces the front and rear wheels to move at the same speed. What does having it all the way down do? is that the center diff open and the front and rear wheels can each spin at any rate they want? and half way???

"All the way down/rear" = OPEN.
Wheels will spin at any rate they want, yes; at least for the 04/05s

65% torque will ALWAYS go to the rears, 35% to the fronts, in open, for '04/05s.

Don't worry about how they can ever spin at the SAME rate when in OPEN, but suffice to say they can

[Thejoyofdriving]

hmmm complicated....

[STi Guru]

Clunking/Shuddering While Parking:

If you hear and/or feel some serious clunking, grinding, or shaking, while making tight turns and/or parking, it is most likely due to the fact that you don't have the DCCD set to Auto. When you use one of the Lock modes, you are trying to force the wheels to turn at the same rate which causes much grief to the differentials. No one knows if this can actually cause damage but from how it sounds, I wouldn't want to risk it.

Therefore, for parking or tight turns use Auto.


Actually, when u hear the clunking it is best to switch your DCCD to open. You get the clunking in Auto but when you go to open it goes away.