DSC ON vs MDM vs DSC OFF

[NYG]

Originally Posted by overlook637

Technical question. How does the rear differential operate with DSC off?

Everything still runs through the ICM but DSC adds additional locking parameters that get turned off when it's disabled.

GHS and DSC share: wheel speed, axial torque, brake values and whether DSC is intervening or not.

[CanAutM3]

Originally Posted by overlook637

Technical question. How does the rear differential operate with DSC off?

The e-diff has its own control unit: the GHAS. The GHAS interfaces with other control units (FEM, DME, DSC, ICM, FEM-ZGM) for proper integration with the other chassis control function.

Excerpt from the F8X Technical Training manual:

[overlook637]

I guess I was looking for a number value. Such as with DSC off the GHAS would still apply say 10% locking interventions on the rear diff.

[CanAutM3]

Originally Posted by overlook637

I guess I was looking for a number value. Such as with DSC off the GHAS would still apply say 10% locking interventions on the rear diff.

I’d say it is the other way around, where over 90% of the time the amount of diff lock up is the same between DSC on or off.

[overlook637]

Much appreciated. I assumed there wasn't much difference for the diff lock up.

[NYG]

Originally Posted by overlook637

I guess I was looking for a number value. Such as with DSC off the GHAS would still apply say 10% locking interventions on the rear diff.

As CanAutM3 stated, your diff will always try to match wheel speeds to the line or curve that you're moving through. DSC will add an extra layer of locking to counter over/under steer.