Coby Wheel
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   BMW M3 and BMW M4 Forum > BMW F80 M3 / F82 M4 Technical Topics > Engine / Drivetrain / Exhaust / Bolt-ons / Tuning

Post Reply
 
Thread Tools Search this Thread
      04-20-2021, 12:00 PM   #1
evo828
Private
Slovakia
11
Rep
78
Posts

Drives: 2016 BMW M4
Join Date: Apr 2020
Location: small town

iTrader: (0)

DSC sensitive after new rear tires

Hi, on my F82 (EU, non-comp) I have recently put new rear tires (stock size 275/35 19) while I kept relativelly worn front tires on (stock 255/35 19).

So the front are worn and the rear's are new. What I have found is that in corners the DSC light is ligthly blinking (even under light throttle) - although no intervention is felt - the occasional blink makes me nervous In MDM or DSC OFF I do not feel any instability so I do not feel the traction to be lost in these corners. Old tires (Michelin 4S) never did this.

Can it be that the DSC is sensitive to the rolling radius difference being cca 3% between front and back (estimate taking the front wear into consideration)? Pressures are ok (2.2bar on all four).
Read somewhere that it might be sensitive to this - but not sure if even on M3/M4.
Appreciate 0
      04-21-2021, 05:59 AM   #2
edwinm3
Brigadier General
edwinm3's Avatar
United_States
712
Rep
3,635
Posts

Drives: F82
Join Date: Nov 2011
Location: Broward

iTrader: (27)

if rears are brand new they're a bit greasy, drive them a few miles.
__________________

Grigio Telesto M4, 6MT.
Coyote F-150
Appreciate 0
      04-21-2021, 02:31 PM   #3
evo828
Private
Slovakia
11
Rep
78
Posts

Drives: 2016 BMW M4
Join Date: Apr 2020
Location: small town

iTrader: (0)

Ive done cca 200miles already. Will give them some more and see.
Appreciate 0
      04-21-2021, 04:38 PM   #4
theweebabySeamus
Lieutenant
127
Rep
428
Posts

Drives: M3
Join Date: Jul 2014
Location: Bay Area

iTrader: (1)

There's not nearly enough of a differnce tin diameters o cause issues. If they're any less 'grippy' of a tire model than the 4S's, then there's your issue.
Appreciate 0
      04-22-2021, 01:47 PM   #5
evo828
Private
Slovakia
11
Rep
78
Posts

Drives: 2016 BMW M4
Join Date: Apr 2020
Location: small town

iTrader: (0)

Thanks, will try another set of rear tires to compare
Appreciate 0
      04-22-2021, 03:11 PM   #6
RSXDC5
Captain
RSXDC5's Avatar
329
Rep
635
Posts

Drives: M3
Join Date: Sep 2012
Location: Scottsdale, AZ

iTrader: (0)

Also, our dsc is not great, not great by a long shot.
__________________
2015 M3 - AW 6Spd w/ CCB
MCS 2-Way Dampers, Spec Twin Disk Clutch, MaxPSI CH, F80Paul Ethanol Tune, VRSF DP's, CS/GTS coding, wide wheels & sticky tires!
Appreciate 0
      04-22-2021, 03:50 PM   #7
Chris@VargasTurboTech
BimmerPost Supporting Vendor
1624
Rep
1,450
Posts


Drives: All Things TurboCharged
Join Date: May 2016
Location: Bay Area

iTrader: (0)

Generally that's going to mean your new tires aren't as sticky. Some tires take a little longer than others to get rid of that greasy feel but I'd think 200 miles is more than enough. Can try a few things including doing a "first gear tire surface refresh", after that it's into better tires.
Appreciate 0
      04-22-2021, 05:43 PM   #8
TopJimmy
Lieutenant Colonel
TopJimmy's Avatar
United_States
1221
Rep
1,672
Posts

Drives: BMW M3 F80
Join Date: Jul 2019
Location: Chester County, PA

iTrader: (1)

They are likely slipping a little from the release agent used on the tire forms. Drive them in for 200mi and see if DSC settles down.
__________________
'18 F80 Base 6MT | FBOs | Kies Hub | Paul's E85 | Stock Turbos | 7 seconds 60-130
Appreciate 0
      04-23-2021, 11:43 AM   #9
hoppes-no9
Private
hoppes-no9's Avatar
50
Rep
68
Posts

Drives: '18 F80 ZCP 6MT
Join Date: Sep 2018
Location: Maryland

iTrader: (0)

Quote:
Originally Posted by edwinm3 View Post
if rears are brand new they're a bit greasy, drive them a few miles.
^^ this. It took >100 miles for my new PS4S to start gripping well. Might take longer if it's cold or you're not driving hard.
Appreciate 1
edwinm3712.00

      04-28-2021, 02:37 PM   #10
evo828
Private
Slovakia
11
Rep
78
Posts

Drives: 2016 BMW M4
Join Date: Apr 2020
Location: small town

iTrader: (0)

So after another 200miles the conclusion is that these are shitty tires for driving. i was not having to much expectations as these were the cheapest tires I could have bought - but I was looking for the cheapest rubber just for bashing around and drifting.
The picture shows them compared to Michelin PS4S (on the top). The bottom ones are the "cheap" stuff: less contact rubber and the rubber composition might be also inferior to PS4S - so I will use these only for occasional drfiting until they will be gone.
Attached Images
 
Appreciate 0
      04-28-2021, 06:09 PM   #11
TopJimmy
Lieutenant Colonel
TopJimmy's Avatar
United_States
1221
Rep
1,672
Posts

Drives: BMW M3 F80
Join Date: Jul 2019
Location: Chester County, PA

iTrader: (1)

So what are these "cheapies" that we shouldn't buy?
__________________
'18 F80 Base 6MT | FBOs | Kies Hub | Paul's E85 | Stock Turbos | 7 seconds 60-130
Appreciate 0
      04-28-2021, 06:23 PM   #12
swagon
Major General
swagon's Avatar
No_Country
7467
Rep
5,847
Posts

Drives: F80 6MT
Join Date: Jun 2013
Location: .

iTrader: (0)

Yeah, man, never cheap out on tyres because they're the only contact patch your car has with the road.
__________________
Appreciate 0
      04-28-2021, 08:48 PM   #13
evo828
Private
Slovakia
11
Rep
78
Posts

Drives: 2016 BMW M4
Join Date: Apr 2020
Location: small town

iTrader: (0)

I have proper tires (Continentals and Michelins). This rear pair was bought cheap intentionally with the sole purpose of trashing them. Was just surprised how DSC is sensitive
The tires are Tracmax Privilo TX-3 275/35 19 - so definitelly not recomended for spirited driving around twisty roads - you will be scared
Appreciate 1
TopJimmy1221.00

Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:59 PM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST