BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      09-25-2010, 07:53 AM   #1
Ghostbear
Private
Germany
2
Rep
89
Posts

 
Drives: 135is 09
Join Date: Jul 2008
Location: Germany

iTrader: (0)

Wobbly normal?

I switched to my winter setup again, since the Winter RFTs were done I went on to get some

http://www.conti-online.com/generato...-ts-830-p.html

My Service Technician messed up and only replaced the rear tires. So Winter RFT Front and Non-RFT back. If I have to take a corner at 60 downhill it feels incredibly wobbly and almost as if the tire would slip off the rims. But only the rear. Tires in the back are at 3bar / ~42psi

Does the tire need to settle, it feels like the DTC is also intervening at some points.


Front Tires have also been ordered and will be added next week but man this creeps me out.
__________________
09 135 is Coupe - Batmobile Black, Performance Exhaust, Performance ShortShiftKit , MT
Appreciate 0
      09-25-2010, 08:38 AM   #2
Dackelone
Moderator
Dackelone's Avatar
Germany
688
Rep
16,662
Posts

 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

iTrader: (1)

New tires will feel "greasy" when new. You need to drive carefuly for the first few hundred miles. BUT I would recomend you not to mix you tires - like you have now. Either put all summers or all winters on!
Appreciate 0
      09-25-2010, 12:11 PM   #3
Tom K.
Major General
Tom K.'s Avatar
United_States
54
Rep
5,409
Posts

 
Drives: '07 328iT, '13 Boxster
Join Date: Mar 2008
Location: Maryland

iTrader: (0)

Mixing RFT & non RFT is probably not a good idea - glad that will only be for a few days.

But why 42 psi in the rear? Why not start at 32F/35R (you'll have to do the conversion) and work up from there? It sounds like the combination of high rear pressure, new tires & tire construction mixing is creating some traction issues, causing the DTC to activate prematurely.

Tom
Appreciate 0
      09-25-2010, 03:56 PM   #4
Ghostbear
Private
Germany
2
Rep
89
Posts

 
Drives: 135is 09
Join Date: Jul 2008
Location: Germany

iTrader: (0)

Sorry one thing got mixed up I have 4 Winter tires front are RFT, Rear are non RFT.

My Girlfriend kind of lives in the alps and we have some visits upcoming, also they already had snow 42 is the recommended pressure for full load, also the dealer put them in this region.
__________________
09 135 is Coupe - Batmobile Black, Performance Exhaust, Performance ShortShiftKit , MT
Appreciate 0
      09-25-2010, 05:33 PM   #5
Dackelone
Moderator
Dackelone's Avatar
Germany
688
Rep
16,662
Posts

 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

iTrader: (1)

I still would not MIX normal tires with RFT tires. The RFT have still side walls and way better turn in response than normal tires.

I have seen test done by Auto Motor und Sport (on VOX german Tv) when they would "mix" tires on a car. This "mix" would be old (6 yrs+ ) tires on the rear of a Golf and new tires on the front. Both sets of tires had the SAME thread depth! One had soft rubber and the other had hard rubber. The car would oversteer like mad. Or understeer if they reversed the tire/axles. Bottom line you do not want to mix tires!
Appreciate 0
      09-25-2010, 05:57 PM   #6
wtzouris
Private
United_States
1
Rep
98
Posts

 
Drives: 2014 328d xDrive Sports Wagon
Join Date: Jun 2008
Location: New York, NY

iTrader: (0)

The tire pressures seem way too high, we are talking cold tire pressures, right? Like measured after at least 6 hours of not driving the car?

I would start with 36 front, 39 rear or something like that (Normal is 33/36) if you think you have heavier gross vehicle loads and and driving regularly at very high speeds.

Also mixing RFT and Non-RFT is a bad idea, as others have mentioned. totally different ride, like having really soft shocks in the back.
Appreciate 0
      09-27-2010, 06:00 PM   #7
VMRWheels
Lieutenant General
VMRWheels's Avatar
259
Rep
16,017
Posts

 
Drives: BMW
Join Date: Jun 2007
Location: Anaheim, CA

iTrader: (4)

Garage List
2014 BMW F22  [0.00]
2013 BMW F06  [0.00]
2013 BMW F30  [0.00]
The characteristics of RFT fronts and high pressure Non-RFT rears sounds to be the problem. I would decrease the rear pressure about 5 PSI and see if it helps stabilize the rear end slightly.

-Charles@VMRWheels
__________________

VMR | Wheels - Mitch A. | p. 714-442-7916 extension 107 | e. Mitch@velocitymotoring.com | ** VMR Holiday Special! **
Appreciate 0
      09-28-2010, 02:35 AM   #8
Ghostbear
Private
Germany
2
Rep
89
Posts

 
Drives: 135is 09
Join Date: Jul 2008
Location: Germany

iTrader: (0)

Thanks for the answers. It was not my idea to do this setup, I ordered 4 Tires. My Service Tech understood that the 2 most weared should be exchanged. Hopefully they will be able to deliver the second pair fast.
__________________
09 135 is Coupe - Batmobile Black, Performance Exhaust, Performance ShortShiftKit , MT
Appreciate 0
      09-28-2010, 05:58 AM   #9
Dackelone
Moderator
Dackelone's Avatar
Germany
688
Rep
16,662
Posts

 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

iTrader: (1)

Quote:
Originally Posted by maxnix View Post
Generally speaking, running winter tires over 60 mph at 55 F or greater for any extended period of time will wear them quickly.

Maybe you have some really trick formulations for winter tires in Europe we don't have here. But it seems a little early to be mounting them unless you live in the Alps.
It is getting kind of chilly outside over here. And where I live it is onlu 300m above sealevel. Go above 700m and it gets much colder at night. By German law when the temps get under 7'C (and past Nov 30th I think!>?) you need to have snow tires mounted. Or All Seasons. No one runs AS tirss though. They are lousy in summer AND winter! lol I think I will put mine on next month though. Usually most Germs leave them on from the end of Nov until mid April.

Right now our daytime highs are only about 15'C. Some nice days are as high as 20'C! Lows are in the 7' to 9'C range. Soon we will need snow scrapers in the morning! lol
Appreciate 0
      09-28-2010, 08:32 AM   #10
ND40oz
Lieutenant
ND40oz's Avatar
4
Rep
489
Posts

 
Drives: 09 135i
Join Date: Dec 2009
Location: Denver

iTrader: (0)

Quote:
Originally Posted by Dackelone View Post
It is getting kind of chilly outside over here. And where I live it is onlu 300m above sealevel. Go above 700m and it gets much colder at night. By German law when the temps get under 7'C (and past Nov 30th I think!>?) you need to have snow tires mounted. Or All Seasons. No one runs AS tirss though. They are lousy in summer AND winter! lol I think I will put mine on next month though. Usually most Germs leave them on from the end of Nov until mid April.
Are you sure about that? I thought Austria had that law, but Germany only required you to have snow rated tires (M+S) if you're driving on snow/ice. As in, you have to have proper tires suitable for your current driving conditions. Your insurance company may have their own requirements as well, but probably won't pay out if you have an accident in the snow and don't have the proper tires.
__________________
09 135i 6MT, ZMP, PPK1
13 X5 35i ZMP, ZMX, 2VA
13 Tiguan SEL 4motion
Appreciate 0
      10-21-2010, 06:14 AM   #11
Ghostbear
Private
Germany
2
Rep
89
Posts

 
Drives: 135is 09
Join Date: Jul 2008
Location: Germany

iTrader: (0)

Just a short feedback. Front tires were mounted yesterday. It's night and day!
__________________
09 135 is Coupe - Batmobile Black, Performance Exhaust, Performance ShortShiftKit , MT
Appreciate 0
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
Forum Jump


All times are GMT -5. The time now is 10:39 PM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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