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      11-25-2020, 10:15 AM   #1057
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Quote:
Originally Posted by AlterZgo View Post
Go with 265/35/19 if you are running 285/35/19 rears. This will match front and rear stagger and not cause DSC issues. I had 255/35/19 F and 285/35/19 rear and had occasional DSC interventions when driving normal speeds on some curved fwy onramps and offramps. These interventions completely went away when I repaced the fronts with 265/35/19s. Going 265/285 will also preserve the stock handling balance of the car.

Also, the 265s up front improved ride quality over the 255s and improved grip as well. As for the look, the 265s and the 285s will give the same slightly beefier look front and rear. I loved the 265/285 PS4S set up on my 437s and would have continued to buy PS4S in those sizes but ultimately upgraded to 20" rims/tires.
That's the kind of feedback I was looking/hoping for. Thank you sir!
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      11-26-2020, 02:48 AM   #1058
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Looking to upsize to 265/35-19 front and 285/35-19 rear on 437s for daily driving. Improved overall drive quality is what i’m after since California roads aren’t so great.
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      11-27-2020, 10:27 AM   #1059
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Quote:
Originally Posted by EezyBeezy View Post
x2

Looking to upsize to 265/35-19 front and 285/35-19 rear on 437s for daily driving. Improved overall drive quality is what i’m after since California roads aren’t so great.
You'll definitely notice improved ride quality. Run them at the recommended 32 PSI and they will feel better than the stock 255/275 35/19 PSS. I recently got 20" rims/tires and switched to 265/295 30-20 PS4S and was surprised that the ride quality stayed very close to the 19" 35 series tires. This was even with the tires set at 34 psi vs. 32 psi on my 19s.

PS4S are amazing tires for both ride and handling IMO.
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      11-27-2020, 02:54 PM   #1060
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Quote:
Originally Posted by AlterZgo View Post
You'll definitely notice improved ride quality. Run them at the recommended 32 PSI and they will feel better than the stock 255/275 35/19 PSS. I recently got 20" rims/tires and switched to 265/295 30-20 PS4S and was surprised that the ride quality stayed very close to the 19" 35 series tires. This was even with the tires set at 34 psi vs. 32 psi on my 19s.

PS4S are amazing tires for both ride and handling IMO.
Right on, definitely good to know!
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      12-03-2020, 02:18 AM   #1061
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Perhaps I overlooked it while searching this thread and others, but is anyone running PS4S's with upgrade turbos?

If so, how do they hold up from the standpoint of straight line traction when you reach power levels around 600 - 700hp?
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      12-04-2020, 04:17 PM   #1062
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Quote:
Originally Posted by Zomboss View Post
I might go this route next time I need to replace my PS4S. I love the increased traction of the PS4S, but I miss the responsiveness of the star spec PSS on the front.
This is a concern of mine, I went from PSS to PS4S on my last car and I enjoyed everything about the PSS more and actually felt it gripped better under all circumstances aside from wet surfaces.

I'm unsure of which direction to go now since I'm at 3/32nd and really am looking for the best tires. I may just get star-spec PSS again based on your feedback.
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      12-06-2020, 01:04 PM   #1063
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Quote:
Originally Posted by spool twice View Post
This is a concern of mine, I went from PSS to PS4S on my last car and I enjoyed everything about the PSS more and actually felt it gripped better under all circumstances aside from wet surfaces.

I'm unsure of which direction to go now since I'm at 3/32nd and really am looking for the best tires. I may just get star-spec PSS again based on your feedback.
Unfortunately, I can’t tell you which is the better tire. It comes down to personal preference and what you value about the tires. For me, I really miss the steering response of the PSS* that I had from the factory. And that’s more important to me than the improved ride quality, grip, and stability of the PS4S. I’m trying to see if I can get the benefits of both tires by mixing PSS* on the front with PS4S on the rear.
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      12-06-2020, 03:48 PM   #1064
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Quote:
Originally Posted by Zomboss View Post
Quote:
Originally Posted by spool twice View Post
This is a concern of mine, I went from PSS to PS4S on my last car and I enjoyed everything about the PSS more and actually felt it gripped better under all circumstances aside from wet surfaces.

I'm unsure of which direction to go now since I'm at 3/32nd and really am looking for the best tires. I may just get star-spec PSS again based on your feedback.
Unfortunately, I can’t tell you which is the better tire. It comes down to personal preference and what you value about the tires. For me, I really miss the steering response of the PSS* that I had from the factory. And that’s more important to me than the improved ride quality, grip, and stability of the PS4S. I’m trying to see if I can get the benefits of both tires by mixing PSS* on the front with PS4S on the rear.
I've very interested to hear about this combo. I have toyed with this same idea.
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      02-24-2021, 02:50 AM   #1065
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Quote:
Originally Posted by Zomboss View Post
Unfortunately, I can’t tell you which is the better tire. It comes down to personal preference and what you value about the tires. For me, I really miss the steering response of the PSS* that I had from the factory. And that’s more important to me than the improved ride quality, grip, and stability of the PS4S. I’m trying to see if I can get the benefits of both tires by mixing PSS* on the front with PS4S on the rear.
Did you end up with the mixed config?

I'm facing issues on the reverse config: new PS4S on the fronts, existing PSS on the rears.

On straight and slightly curvy roads it's all good, but when driving around the more curvy backroads that I frequent the car just seems less planted, the turn-in isn't as sharp and the car seems to sway (front-back) where it used to point and just go in that direction. It's not just "responsiveness" - I have significantly less confidence when taking corners at speed now, and it's a real bummer.

I'm wondering if just switching the rears to PS4Ses will solve this issue, or if I should sell the front PS4Ses and switch back to PSSes instead.

Would appreciate advice from those of us here who've faced similar issues and possibly tried various permutations.
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      02-24-2021, 08:22 PM   #1066
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Quote:
Originally Posted by therealkenc View Post
Did you end up with the mixed config?

I'm facing issues on the reverse config: new PS4S on the fronts, existing PSS on the rears.

On straight and slightly curvy roads it's all good, but when driving around the more curvy backroads that I frequent the car just seems less planted, the turn-in isn't as sharp and the car seems to sway (front-back) where it used to point and just go in that direction. It's not just "responsiveness" - I have significantly less confidence when taking corners at speed now, and it's a real bummer.

I'm wondering if just switching the rears to PS4Ses will solve this issue, or if I should sell the front PS4Ses and switch back to PSSes instead.

Would appreciate advice from those of us here who've faced similar issues and possibly tried various permutations.
With the amount of driving I do during the pandemic, I can probably get another 3-4 years on my PS4S before I need to replace them. I found that increasing the tire pressure on the PS4S to 34-35 PSI on the front helps with the steering response. I did not observe the front-back sway issue with all four on PS4S.
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      02-25-2021, 06:44 PM   #1067
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Quote:
Originally Posted by Zomboss View Post
With the amount of driving I do during the pandemic, I can probably get another 3-4 years on my PS4S before I need to replace them. I found that increasing the tire pressure on the PS4S to 34-35 PSI on the front helps with the steering response. I did not observe the front-back sway issue with all four on PS4S.
Thanks Think I'll experiment with switching out the rears to PS4S.
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      02-25-2021, 09:17 PM   #1068
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Quote:
Originally Posted by therealkenc View Post
Thanks Think I'll experiment with switching out the rears to PS4S.
I would suggest to experiment with the tire pressure before swapping out the rears.
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      02-25-2021, 10:10 PM   #1069
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Quote:
Originally Posted by Zomboss View Post
Quote:
Originally Posted by therealkenc View Post
Thanks Think I'll experiment with switching out the rears to PS4S.
I would suggest to experiment with the tire pressure before swapping out the rears.
I upped the front pressure to 38 psi (hot) and the car still doesn't feel planted the way it used to around the bends
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      03-04-2021, 10:36 AM   #1070
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Quote:
Originally Posted by therealkenc View Post
I upped the front pressure to 38 psi (hot) and the car still doesn't feel planted the way it used to around the bends
IMO, I don't think increasing the tire pressure too much would help the car feel more "planted", A higher tire pressure makes the middle of the center tire bow out more which causes more inner tire wear. This would also reduce the contact patch.



Try adding camber plates to the front and run more negative camber in the front and dial out negative camber in the rear (-3.0 Front -2.0 rear) or something similar like that. This would help reduce understeer and increase mid cornering grip to feel more "planted".

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      03-04-2021, 07:34 PM   #1071
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Hi - I'm considering replacing my RE-11s with identical spec PS4S:

19x9.5 ET20 265/35/19
19x11 ET40 305/30/19

That said, the rear tread width seems to be 0.4" wider.

I'm lowered on kw ddc's and rears aren't currently rubbing and I'd like to keep it that way! Should I risk it??
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      03-05-2021, 06:22 PM   #1072
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Indeed, thanks for this.

I think it's mostly a case of me not having a good handle on the relevant semantics pertaining to driving. Need me some M school.

I upped the tire pressure after reading some of the threads on here regarding steering response issues after switching to the PS4S, thinking that it would somehow solve the squirminess + rolling that I was feeling, and it's that squirminess + rolling that I was referring to when I said the car didn't feel planted. On the PSS, the car didn't feel this way. Also, the PSS were a significant upgrade in the "planted-ness" of the car when switching to them from the CSC5Ps.

I then read on rennlist about porsche owners facing similar issues with the PS4S, and the prevailing solution was to lower the tire pressure, which increases grip, so I'm currently experimenting with 33 psi cold all around.

Haven't had the chance to push the car around the same bends, but once I decided if I'm keeping the PS4S I'll probably get an alignment done and play with the camber settings as you pointed out.

Quote:
Originally Posted by N1rve View Post
IMO, I don't think increasing the tire pressure too much would help the car feel more "planted", A higher tire pressure makes the middle of the center tire bow out more which causes more inner tire wear. This would also reduce the contact patch.



Try adding camber plates to the front and run more negative camber in the front and dial out negative camber in the rear (-3.0 Front -2.0 rear) or something similar like that. This would help reduce understeer and increase mid cornering grip to feel more "planted".

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      03-05-2021, 06:28 PM   #1073
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Quote:
Originally Posted by therealkenc View Post
Indeed, thanks for this.

I think it's mostly a case of me not having a good handle on the relevant semantics pertaining to driving. Need me some M school.

I upped the tire pressure after reading some of the threads on here regarding steering response issues after switching to the PS4S, thinking that it would somehow solve the squirminess + rolling that I was feeling, and it's that squirminess + rolling that I was referring to when I said the car didn't feel planted. On the PSS, the car didn't feel this way. Also, the PSS were a significant upgrade in the "planted-ness" of the car when switching to them from the CSC5Ps.

I then read on rennlist about porsche owners facing similar issues with the PS4S, and the prevailing solution was to lower the tire pressure, which increases grip, so I'm currently experimenting with 33 psi cold all around.

Haven't had the chance to push the car around the same bends, but once I decided if I'm keeping the PS4S I'll probably get an alignment done and play with the camber settings as you pointed out.
Try running 30 PSI cold. 33PSI is still higher than BMW recommended.

Car doesn't come with camber adjustment in the front, you'll need camber plates.
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      03-05-2021, 08:20 PM   #1074
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Quote:
Originally Posted by N1rve View Post

Try running 30 PSI cold. 33PSI is still higher than BMW recommended.

Car doesn't come with camber adjustment in the front, you'll need camber plates.
I actually did try getting to 30psi cold, but I kept getting the low tire pressure warning on idrive. Don't you?
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      03-06-2021, 02:11 AM   #1075
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Quote:
Originally Posted by therealkenc View Post
I actually did try getting to 30psi cold, but I kept getting the low tire pressure warning on idrive. Don't you?
No...2 PSI lower while cold shouldn’t set off TPMS. It should be around 27 PSI when it would set off. I’ve tried 30 PSI for the comfort and grip and it’s marginally better.
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      03-06-2021, 09:53 AM   #1076
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Quote:
Originally Posted by N1rve View Post
Quote:
Originally Posted by therealkenc View Post
I actually did try getting to 30psi cold, but I kept getting the low tire pressure warning on idrive. Don't you?
No...2 PSI lower while cold shouldn’t set off TPMS. It should be around 27 PSI when it would set off. I’ve tried 30 PSI for the comfort and grip and it’s marginally better.
That's weird - mine goes off even at 30. I'll experiment again, thanks.
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      03-07-2021, 02:10 AM   #1077
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Quote:
Originally Posted by zorrro View Post
Hi - I'm considering replacing my RE-11s with identical spec PS4S:

19x9.5 ET20 265/35/19
19x11 ET40 305/30/19

That said, the rear tread width seems to be 0.4" wider.

I'm lowered on kw ddc's and rears aren't currently rubbing and I'd like to keep it that way! Should I risk it??
Can you add anymore negative camber to tuck the wheel in more? Or are you maxed out? If you aren't comfortable with more negative camber, I wouldn't risk the extra width.
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      03-07-2021, 07:32 AM   #1078
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Quote:
Originally Posted by N1rve View Post
Quote:
Originally Posted by zorrro View Post
Hi - I'm considering replacing my RE-11s with identical spec PS4S:

19x9.5 ET20 265/35/19
19x11 ET40 305/30/19

That said, the rear tread width seems to be 0.4" wider.

I'm lowered on kw ddc's and rears aren't currently rubbing and I'd like to keep it that way! Should I risk it??
Can you add anymore negative camber to tuck the wheel in more? Or are you maxed out? If you aren't comfortable with more negative camber, I wouldn't risk the extra width.
Thanks I'm happy with current settings so don't want to dial more camber in. Sounds like replacing re-11s with re-71s is the play.
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