ESC OFF isn't really OFF, is it?

ESC OFF isn't really OFF, is it?

Author
Discussion

k_m

Original Poster:

58 posts

5 months

Sunday 26th May
quotequote all
Noticed today two phenomenas:

1) It is quite often not possible to switch the ESC OFF in Sports Mode. When cruising around in Sports Mode, it very often takes ages and several trials until the ESC actually switches off, even with prolonged pressing of the designated switch nothing happens.

Am I to stupid or are there any tricks to switch it off on first attempt?

2) When pushing the limits I have the impression that the ESC is still engaging in Sports Mode with ESC OFF, just with much higher tolerances. Even in Track Mode I think I felt several single wheel brake inputs, especially when the car understeered while entering a tight hairpin bend.

Is that my imagination or is the ESC still active when switched OFF as a last chance safety backup?

Edited by k_m on Sunday 26th May 19:19

k_m

Original Poster:

58 posts

5 months

Monday 27th May
quotequote all
a110au said:
perhaps you are feeling the e limited slip diff that brakes the skidding wheel to move torque to the other wheel?
This!
I thought the "LSD via brake inputs" would also be disengaged with ESP off, but likely that's what I felt.

k_m

Original Poster:

58 posts

5 months

Tuesday 28th May
quotequote all
So only in Track mode it's possible to switch off the ECS completely. When switched off in Sports mode it still remains active in a degraded level.
Then we additionaly have the "LSD via brake input", what is not mentioned in the manual. That should also be disengaged when the ECS is switched off in Track mode, otherwise the driving on snow thingy would make no sense, wouldn't it?

Besides that, I still wonder why quite often it takes several attempts to switch the ESC off in Sports mode. I couldn't find any consistence here.

k_m

Original Poster:

58 posts

5 months

Tuesday 28th May
quotequote all
Yep, that's exactly what I meant. When switched off via the designated switch it is only switched off in Track mode, not in Sports mode.

k_m

Original Poster:

58 posts

5 months

Thursday 30th May
quotequote all
Okay, thanks for clarification, David.


k_m

Original Poster:

58 posts

5 months

Well, I still get the following phenomena in Sports mode with the ESP switched OFF via the designated switch:

When entering pretty fast tight hairpin bends the car produces a "BRRRRRRRRR" noise from the front compartement, like the ABS block is triggering, but without a mechanical feedback on the brake pedal. It seems to happen more in left bends, less in right bends.

I ask myself what intervention that could be?

ABS? But it happens also when I just slightly hit the brake pedal with no feedback. On all other cars I've had the brake pedal vibrates when the ABS triggers.
Understeer prevention? Is that still active with ESP off?
Electronical LSD? But it happens prior pushing the throttle pedal before passing the apex.

I still have to try if it's different in Track mode.

k_m

Original Poster:

58 posts

5 months

For sure, Sports Mode plus ESC switched off via the designated switch with the according message shown up in the tachy display.