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
      10-04-2012, 04:26 PM   #1
clutch128
Private
clutch128's Avatar
United_States
1
Rep
58
Posts

 
Drives: 2011 128i
Join Date: Dec 2011
Location: Santa Barbara, CA

iTrader: (0)

symmetric vs. asymmetric wheel setup on 10/2010 128i

I did another track day Monday. It is doing a number on the tires. I was thinking of getting a dedicated set of slicks or semi-slicks to just use for track use. If I did that I was thinking at the same time getting a wider set of front tires. Right now I'm running 18"x7.5" on the front and 18"x8.5" on the rear. I'm motivated to go bigger on the front in order to try to deal with understeer. I guess I could put in a bigger sway bar (front?) or play with the tire pressure. And of course a lot of it is technique and I'm working on that. Thoughts?
Appreciate 0
      10-04-2012, 06:25 PM   #2
Kim Schwartz
Private First Class
2
Rep
121
Posts

 
Drives: 128i
Join Date: Aug 2010
Location: Albuquerque

iTrader: (0)

I have a 128i with the sport package and have switched to 225/40 /18 in each corner and for me it is a very worhtwhile change as it does minimize the understeer and at least techniclly improves braking as there is more tire up front. I keep the staggered set with all season tires on them for when it snows which isn't very often in Albuquerque. And yes, I notice the improvement more on a track than on the street. There is a lot about this in the track section.
Appreciate 0
      10-05-2012, 01:12 PM   #3
clutch128
Private
clutch128's Avatar
United_States
1
Rep
58
Posts

 
Drives: 2011 128i
Join Date: Dec 2011
Location: Santa Barbara, CA

iTrader: (0)

thanks. That's very useful. No rubbing on the front with that setup?
Appreciate 0
      10-07-2012, 09:21 PM   #4
Kim Schwartz
Private First Class
2
Rep
121
Posts

 
Drives: 128i
Join Date: Aug 2010
Location: Albuquerque

iTrader: (0)

.....no rubbing at all. I am using a 45mm offset on 7.5"x 18" wheels.
Appreciate 0
      11-25-2012, 06:55 PM   #5
HeelToe
Major
HeelToe's Avatar
United_States
23
Rep
1,188
Posts

 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
BTW. Bigger sway bar in the back for less understeer. Be aware though that the rear suspension assembly has to be lowered to change the rear sway bar so it can be pricey if you don't do it yourself. I'm running 235/40 in front with 245/35 in back. I also have Dinan fixed offset camber plates that offset the stock camber adjustment range by 0.7 degrees.
Appreciate 0
      11-25-2012, 07:20 PM   #6
Greenkirby21
Vrooom :)
Greenkirby21's Avatar
United_States
92
Rep
2,608
Posts

 
Drives: C7 Stringray
Join Date: Jun 2010
Location: Dream Land

iTrader: (1)

Send a message via AIM to Greenkirby21
no rubbing by me and I am using 17x8 all around rims with 225 front and 245 rear. Grip is definitely a plus, although it does still understeer vs going 225 all around
__________________
2014 C7 Corvette Stringray - Laguna Blue - NPP Exhaust - Competition Seats
Appreciate 0
      11-25-2012, 09:08 PM   #7
clutch128
Private
clutch128's Avatar
United_States
1
Rep
58
Posts

 
Drives: 2011 128i
Join Date: Dec 2011
Location: Santa Barbara, CA

iTrader: (0)

I ended up switching to 17x8's all around with slicks. No more understeer.

Now I have a *ton* of roll.
So, what next?
a.) rear subframe bushings/mounts?
b.) New roll bars? J&R, M3...?
c.) Coilovers...which?
Appreciate 0
      11-25-2012, 09:15 PM   #8
HeelToe
Major
HeelToe's Avatar
United_States
23
Rep
1,188
Posts

 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
Sway bars. Eibach or H&Rs.
Appreciate 0
      11-26-2012, 05:47 PM   #9
dsdubs
New Member
0
Rep
11
Posts

 
Drives: 2011 135i - DCT M
Join Date: Nov 2012
Location: Texas

iTrader: (0)

What's the best way to mitigate under steer while maintaining a reasonable level of daily driving capability. A square setup with slicks seems extreme for most of us.

Camber plates? Rear sway? < 30mm staggered setup?
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 07:30 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