[Celestion]

Originally Posted by baron95

Yes. And I have done 3 track days.

I think the MP HAS has a good balance of handling, comfort and ride height.

On track you do need to set it to sport plus, and even then the rear is still a bit unsettled (moving all the time).

On the street comfort for day to day, sport for the fun roads is all you need - firm but not jarring.

Overall, I’m very happy that I optioned that in. Highly recommended.

Helpful. Thank you! I have only driven an auto g87 with the factory springs in sport +. Honestly, it felt just like my g80 M3C, but the ability to step out and drift was noticeably more playful/controllable on the g87.

Pretend that the MP HAS had zero drop... would you option them again purely for their performance characteristics, or do you think the default springs are better suited in that regard?

[Mr. Hankey]

Originally Posted by baron95

Yes. And I have done 3 track days.

I think the MP HAS has a good balance of handling, comfort and ride height.

On track you do need to set it to sport plus, and even then the rear is still a bit unsettled (moving all the time).

On the street comfort for day to day, sport for the fun roads is all you need - firm but not jarring.

Overall, I’m very happy that I optioned that in. Highly recommended.

Is the rear unsettled during braking or while driving as well?

The M5 comps a few years back introduced “panic braking” where under very heavy breaking the car would add 5-10% rear bias to help it stop better. You had to turn that feature off on track because you would threshold brake to prevent that system from activating, not the ABS!

Wondering if this was somehow carried forward from the F90s to the G8X? I have no idea but when that system kicked in the back would get squirrelly.

[BackOnBlack]

Originally Posted by baron95

Yes. And I have done 3 track days.

I think the MP HAS has a good balance of handling, comfort and ride height.

On track you do need to set it to sport plus, and even then the rear is still a bit unsettled (moving all the time).

On the street comfort for day to day, sport for the fun roads is all you need - firm but not jarring.

Overall, I’m very happy that I optioned that in. Highly recommended.

Originally Posted by Mr. Hankey

Is the rear unsettled during braking or while driving as well?

I experienced similar issue during my last DE, under braking. I kept DSC on during wet runs, had no issue with instability under braking, but during damp conditions I switched to MDM, and under 1.1-1.2 g braking, the car was moving around quite a bit under braking.

During dry runs, I switch DSC off completely, and that instability went away mostly. This may be due to how the DSC logic changes the rear diff operations. If the e-diff can simulate 2-way LSD, it would explain the situation well, but I do not know what type of LSD operation is simulates. Even a 1.5-way LSD simulation would explain the situation.

[baron95]

Originally Posted by Celestion

Helpful. Thank you! I have only driven an auto g87 with the factory springs in sport +. Honestly, it felt just like my g80 M3C, but the ability to step out and drift was noticeably more playful/controllable on the g87.

Pretend that the MP HAS had zero drop... would you option them again purely for their performance characteristics, or do you think the default springs are better suited in that regard?

I drove stock G87 only on the road and controlled M track days. I’m going to venture, but don’t take it as absolute, that the MP HAS is more predictable in transitions and had a lot less understeer.

I’d still take the MP HAS for the driving dynamics alone. But again, it’s doing it from memory, vs driving both back to back. I think they are both good setups. I prefer the MP HAS feel, but it’s not like a night and day thing. Like one is a 7 the other one is an 8.

[baron95]

Originally Posted by Mr. Hankey

Is the rear unsettled during braking or while driving as well?

Not under braking. But when accelerating hard out of turns and/or pavement ondularions, yes, the rear moves a lot.

It’s like the suspension hits some set of limit and gives up. It’s extremely easy to catch, but I don’t know why BMW couldn’t dial that out. (I’m not talking about a drift or tire limit slide - this is some sort of abrupt moment of the suspension through a portion of the travel - kinda of weird of you ask me).

[BackOnBlack]

Originally Posted by baron95

Not under braking. But when accelerating hard out of turns and/or pavement ondularions, yes, the rear moves a lot.

It’s like the suspension hits some set of limit and gives up. It’s extremely easy to catch, but I don’t know why BMW couldn’t dial that out. (I’m not talking about a drift or tire limit slide - this is some sort of abrupt moment of the suspension through a portion of the travel - kinda of weird of you ask me).

Bump steer, especially with lowered chassis.

[baron95]

Originally Posted by BackOnBlack

Bump steer, especially with lowered chassis.

Valid thought. But it’s the rear that seems to roll all of a sudden. It’s surprising given how sophisticated the rear suspension is and how primitive the front McOearsin is. It could just be the soft sidewall tires as well.

If I were to guess, the fid would be a stiffer antiroll bar at the rear.

In any event it’s a great car, great suspension, none of these things would be an issue on the street, and easily manageable on track.