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
      11-07-2012, 03:22 PM   #1
Faulal
New Member
 
Faulal's Avatar
 
Drives: 135i 2008
Join Date: Jun 2012
Location: Lincoln

Posts: 21
iTrader: (0)

Acceleration from stand still terrible with run flats

I have a stock 2008 135i.
It has 2nd generation bridgestone run flats. I have not owned this less then a year. Most of the roads where I live are in bad shape. When accelerating from a stand still on these main roads in 1st and 2nd gear, I can't go anywhere near wide out. The tires hit the cracks and bumps and it slams the drivetrain. It feels like wheel hoop but only when it hits not perfect concrete. It feels horrible. Traction control does not kick in until its so sever, it feels like I'm damaging the car. My guess is its the run flats, however could it be the suspension or lack of a LSD?
As its became colder outside it is getting worse. Now every basic commuter car can out accelerate me to 40mph, when they floor it from a stand still. Not until 40+mph will the car hook up and smoothly go.
I used to have an E39 M5 with michelin PS2s and it never had this problem it would accelerate hard over any bad road surface.
Would getting non run flats fix this? Taking off hard from a stop light is one thing I look forward to every time I get in my car.
Faulal is offline   United_States
0
Reply With Quote
      11-07-2012, 03:29 PM   #2
135iMike
First Lieutenant
 
Drives: 2012 White 135i
Join Date: Apr 2012
Location: United States

Posts: 334
iTrader: (1)

Not an answer, but I've never experienced such a thing with my runflats. I'm on 2012 Dunlops though. I can WOT with very limited slip, if any, unless I'm dumping the clutch of course.
135iMike is offline  
0
Reply With Quote
      11-07-2012, 05:32 PM   #3
doublevanosrc
Loves Runflats.
 
doublevanosrc's Avatar
 
Drives: 2013 VW GTi
Join Date: Jul 2009
Location: Austin. Tx

Posts: 1,851
iTrader: (1)

Garage List
2011 BMW  [0.00]
2011 BMW  [0.00]
Me neither, I bought a brand new set of Potenza run-flats this summer and they're all good, car takes off like a bat out of hell even on rough pavement(makes for a bumpy ride though) I like a stiff tire and the roads here are great so no problem there. My only beef is that rear tires don't last long, I got 18k miles out of my first set.
__________________
2011 135i M Sport
Gone and missed
doublevanosrc is offline   United_States
0
Reply With Quote
      11-07-2012, 05:46 PM   #4
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,191
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
Your stiff stock suspension is my bet, I have the same issue on normal tires over crappy pavement.
Stohlen is offline  
0
Reply With Quote
      11-07-2012, 09:41 PM   #5
Giancarlo
Enlisted Member
 
Drives: 2012 135
Join Date: Aug 2011
Location: Mexico

Posts: 35
iTrader: (0)

I just switched to michelin PS2 run flats and it made a difference, not totally fix this but helped. Tire pressure would be a good place to start.
Giancarlo is offline  
0
Reply With Quote
      11-07-2012, 09:52 PM   #6
flinchy
Colonel
 
Drives: 130i
Join Date: Nov 2011
Location: QLD, Australia

Posts: 2,557
iTrader: (0)

run flats always have worse grip than non runflats

suspension setup bouncing... no LSD not letting traction go where it's needed

all of the above..
flinchy is offline  
0
Reply With Quote
      11-08-2012, 05:54 AM   #7
Crumpet
New Member
 
Drives: 2011 BMW 135i DCT
Join Date: Oct 2012
Location: Melbourne, Australia

Posts: 16
iTrader: (0)

Never had an issue with my Run Flats ,if anything it do sent break out enough !
Crumpet is offline  
0
Reply With Quote
      11-08-2012, 09:56 AM   #8
bmw1racer
bimmerphile, technogeek
 
bmw1racer's Avatar
 
Drives: 2012 128i Coupe 6MT Sport
Join Date: Jun 2011
Location: SoCal

Posts: 1,749
iTrader: (0)

Garage List
Quote:
Originally Posted by doublevanosrc View Post
My only beef is that rear tires don't last long, I got 18k miles out of my first set.
Ages ago, I got only about 15K on my Pirelli P6s... But they stuck like glue.
__________________
bmw1racer is offline   United_States
0
Reply With Quote
      11-09-2012, 03:38 PM   #9
Tom K.
Major General
 
Tom K.'s Avatar
 
Drives: '07 328iT, '13 Boxster
Join Date: Mar 2008
Location: Maryland

Posts: 5,357
iTrader: (0)

Quote:
Originally Posted by flinchy View Post
run flats always have worse grip than non runflats
Since tread design is more important than sidewall stiffness, this is
simply not true as there are many different makes and models of both RFTs and go-flats.

Faulal, have you double checked tire pressures and measured the rear tires' tread depth?

Tom
Tom K. is offline   United_States
0
Reply With Quote
      11-11-2012, 12:37 AM   #10
flinchy
Colonel
 
Drives: 130i
Join Date: Nov 2011
Location: QLD, Australia

Posts: 2,557
iTrader: (0)

Quote:
Originally Posted by Tom K. View Post
Since tread design is more important than sidewall stiffness, this is
simply not true as there are many different makes and models of both RFTs and go-flats.

Faulal, have you double checked tire pressures and measured the rear tires' tread depth?

Tom
It's actually tire compound tht's more important than tread, tread is only important for wet driving

It's not just a stiff sidewall, it's a hard compound

It's 100% not possible for the best rft to compare to a good non-rft.
flinchy is offline  
0
Reply With Quote
      11-11-2012, 01:10 AM   #11
sharkatron
First Lieutenant
 
Drives: `09 135i
Join Date: Mar 2012
Location: Melbourne

Posts: 387
iTrader: (0)

Just something to think about - a bald tire may give more grip in the dry. Obviously dangerous in the wet. Kinda like slicks. Anyone care to confirm?

Edit: actually not like slicks - they are made of a stickier compound. Our dailies are not - what I'm getting at is that a bald tire has more surface area contact with the road than a new threaded one, hence the increase in grip.
sharkatron is offline   Australia
0
Reply With Quote
      11-11-2012, 08:08 AM   #12
Maine1
Private First Class
 
Drives: 135i
Join Date: May 2008
Location: Scarborough, Maine

Posts: 163
iTrader: (0)

When my original run-flats were getting bald I thought the traction might get better, but the traction actually was much worse - just theway you desribe it. I went to non run-flats, frist star specs and now pilot SS and the ride quality is much smoother. No more banging on pot holes and cracks. The only minor down side is that the initial turn in was slightly sharper with the stiff sidewall run-flats.
__________________

Blue Water 135i
Maine1 is offline   United_States
0
Reply With Quote
      11-12-2012, 01:09 PM   #13
Ash83
Major
 
Ash83's Avatar
 
Drives: 10' 135i (sold)/14' Audi RS5
Join Date: Jan 2010
Location: Miami, FL

Posts: 1,159
iTrader: (1)

RFTs are a love and hate relationship. I love their convenient factor when you live in a state where its hot/humidity/rainy and you do not want to deal with putting the spare on your way to work.

I have the same issue with my RFTs on a stock suspensio, I can not do any WOT on 1st. I know JB4 has an option to limit the boost on 1st that I thinking can be helpful in this situation but I did not have time to play around with it.
__________________
Alpine White, Coral RED , Glacier Silver Aluminum trim, M sport, 6MT, NAV, HiFi, USB-iPod, Bluetooth

Performance: JB4|BMW PE|DP Cosmetics: BMW Sport Pedals|Black Kidney Grill
Ash83 is offline   United_States
0
Reply With Quote
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 04:39 AM.




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