MPS4S Tyres - A concern

[t5pilot]

Originally Posted by Aero1971

Did you get any better results from the MP4S's, I have the same issue on my M4.

I had MPSS's all-round but when they were due for replacement at a little over 12k miles, I swapped the rears out for MP4S's after reading some strong and positive reviews on them (note; those reviews were more based on M3 owners). However these new tires have all but killed the great feeling the car use to give me. The car always felt very planted and stable at all speeds and cornered wonderfully, never felt uneasy on breaking or tramlined, but now the car does not inspire any confidence, breaking is horrible and faster pace driving is a very uneasy experience, in the end the only gain is in wet conditions where they are certainly offer better grip. They've got around 2.5k under their belt now, no real change, they got slightly better but not even remotely close to what I was expecting or experienced from the MPSS's. I've tried playing with the pressures, currently running 2.8 in the rear (2.4 front on the original MPSS's), tried lighter pressures originally, more around factory settings, but no lower, maybe thinking about adding a little to the rears?? Any ideas?!

Those pressures seem high to me tbh. I can't wait to get my MPS4S's back on the rear of mine (present cup2's nearly shot).
I run them the same pressure as the cup2's, 2.2 bar (cold).

[Tengocity]

Originally Posted by t5pilot

Those pressures seem high to me tbh. I can't wait to get my MPS4S's back on the rear of mine (present cup2's nearly shot).
I run them the same pressure as the cup2's, 2.2 bar (cold).

Agree, those pressures are way too high compared to what's in the door card, and what I run.

[Aero1971]

Originally Posted by t5pilot

Those pressures seem high to me tbh. I can't wait to get my MPS4S's back on the rear of mine (present cup2's nearly shot).
I run them the same pressure as the cup2's, 2.2 bar (cold).

I was running at the door card recommendations, but I'll try them at 2.2 (cold) and see if this transforms the feel. Thx for the advise

[M4_CaptFlashheart]

Originally Posted by t5pilot

Just confirm, you've got the pilot sport 4s & not pilot sport 4?
So MPS4S, not MP4S...

Yes, MPS4S on the rears now. 12mm spacers. No spacers up front with MPSS. Rear of the car feels as if its sliding when pushing at speed on b roads etc. A real shame because with my last 2 M4's The first one had continental P5 which I didn't rate at all, sliding everywhere, then the MPSS on my last M4 which were a massive improvement, then reading about the MPS4S being better, I tried them. Not at all happy and having just gotten home from work, I need to play around with tyre pressures and remove spacers to make sure its not something simple. Wish i'd just stuck with MPSS. Anyone want to buy a set of hardly used MPS4S 285/30/20??? lol

[M4_CaptFlashheart]

Originally Posted by JD16

Completely agree and have managed to test them in all conditions now and speeds. Have certainly got nothing but good things to say.

When you say at all speeds, are we saying normal road speeds? At road legal speeds I can't fault them really because they aren't being pushed at all.

[t5pilot]

Originally Posted by M4_CaptFlashheart

Yes, MPS4S on the rears now. 12mm spacers. No spacers up front with MPSS. Rear of the car feels as if its sliding when pushing at speed on b roads etc. A real shame because with my last 2 M4's The first one had continental P5 which I didn't rate at all, sliding everywhere, then the MPSS on my last M4 which were a massive improvement, then reading about the MPS4S being better, I tried them. Not at all happy and having just gotten home from work, I need to play around with tyre pressures and remove spacers to make sure its not something simple. Wish i'd just stuck with MPSS. Anyone want to buy a set of hardly used MPS4S 285/30/20??? lol

My setup is the same on 12mm spacers.
Isn't it interesting how opinions vary. I love the 4S on the back. Feels so planted to me. No rolling or squirming at all.
How much do you want for yours? I'm always up for having some spares...

[M4_CaptFlashheart]

Originally Posted by t5pilot

My setup is the same on 12mm spacers.
Isn't it interesting how opinions vary. I love the 4S on the back. Feels so planted to me. No rolling or squirming at all.
How much do you want for yours? I'm always up for having some spares...

Do you have the spacers all round? I'm just wondering if not fitting my front spacers yet is the cause of the issue? Geo slightly out creating imbalance. I just want to try and see if theres something obvious causing this. You're right about opinions. Weird how they feel great to some people and not to others. I'm wondering if there are different spec tyres ?? Mine are definitely the MPS4S and XL 99Y. Pressure 2.2bar.

[t5pilot]

Originally Posted by M4_CaptFlashheart

Do you have the spacers all round? I'm just wondering if not fitting my front spacers yet is the cause of the issue? Geo slightly out creating imbalance. I just want to try and see if theres something obvious causing this. You're right about opinions. Weird how they feel great to some people and not to others. I'm wondering if there are different spec tyres ?? Mine are definitely the MPS4S and XL 99Y. Pressure 2.2bar.

Those tyres are identical to mine.
Yes, 12mm spacers all round, I'm not a believer in altering front/rear axles to a different proportion than designed.

[SteveChester]

I was thinking about replacing my MPSS with 4s on the fronts when they are due but not so sure now!!

[M4_CaptFlashheart]

I'll report my findings when I can be bothered to put my spacers on the front. Hopefully tomorrow.

[M4_CaptFlashheart]

Well a few hundred miles later and they seem to have improved. Just waiting for some dry weather so i'll sport back around august 2020