BMW M3 Forum (E90 E92)

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


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Track / Autocross / Dragstrip / Driving Techniques
 
Evolve Automotive
Post Reply
 
Thread Tools Search this Thread
      02-12-2013, 09:36 PM   #1
Wellardmac
Ninja World Traveler
 
Wellardmac's Avatar
 
Drives: E90 M3
Join Date: Oct 2011
Location: Apex, NC

Posts: 66
iTrader: (0)

Anyone tell me what these are and where they go?

When I bought my E90 M3 I was given a couple of threaded pins by the previous owner. He said they were "pinion pins" and that he took them out to help handling when he autocrossed.

I would like to put the pins back in their rightful place, but a search on "pinion pins" didn't turn up anything useful to tell me where they go and how to put them back. I would really appreciate guidance from anyone that can point me in the right direction.
Attached Images
 
__________________
E90 M3 - Interlagos Blue
BMWCCA# 456739
Wellardmac is offline   United_States
0
Reply With Quote
      02-12-2013, 10:29 PM   #2
Richbot
Lieutenant Colonel
 
Drives: Jerez Black E90
Join Date: Sep 2007
Location: STL

Posts: 1,996
iTrader: (2)

Those are the alignment pins for the upper strut mounts. They locate the strut mount in place from the factory to maintain the factory alignment settings. They are pulled to allow the strut mount to slide in the slotted upper mount to get additional negative camber. See the DIY section for details.
__________________
Richbot is offline  
0
Reply With Quote
      02-13-2013, 06:21 AM   #3
Wellardmac
Ninja World Traveler
 
Wellardmac's Avatar
 
Drives: E90 M3
Join Date: Oct 2011
Location: Apex, NC

Posts: 66
iTrader: (0)

Awesome, thanks - no wonder I couldn't find anything on them when I didn't have the correct name. Are they easy to reinstall?
__________________
E90 M3 - Interlagos Blue
BMWCCA# 456739
Wellardmac is offline   United_States
0
Reply With Quote
      02-13-2013, 09:43 AM   #4
Groundpilot
Major
 
Groundpilot's Avatar
 
Drives: 135I DCT , e92 M3 DCT, Audi A6
Join Date: Mar 2010
Location: long island,ny

Posts: 1,164
iTrader: (0)

Send a message via ICQ to Groundpilot
They are very easy to reinstall, but why would you want to do it?
__________________

David
Groundpilot is offline   United_States
0
Reply With Quote
      02-13-2013, 09:47 AM   #5
Porschefile
Major
 
Porschefile's Avatar
 
Drives: E92 M3
Join Date: Jul 2008
Location: Tennessee

Posts: 1,232
iTrader: (6)

Reinstalling those will only make the car handle worse.
Porschefile is offline  
0
Reply With Quote
      02-13-2013, 05:57 PM   #6
Wellardmac
Ninja World Traveler
 
Wellardmac's Avatar
 
Drives: E90 M3
Join Date: Oct 2011
Location: Apex, NC

Posts: 66
iTrader: (0)

Okay - good to know. Does having them out have any impact on tire wear?

My front tires have worn on the inside edge (a lot faster then the rest of the tire), so I'm pointing the finger at a bad alignment and left wondering if the pins being out contributed.
__________________
E90 M3 - Interlagos Blue
BMWCCA# 456739
Wellardmac is offline   United_States
0
Reply With Quote
      02-13-2013, 07:04 PM   #7
CanAutM3
Brigadier General
 
CanAutM3's Avatar
 
Drives: 2015 M4 DCT
Join Date: Jan 2012
Location: Montreal

Posts: 3,583
iTrader: (0)

Garage List
2015 BMW M4  [4.50]
2006 Audi S4  [0.00]
Quote:
Originally Posted by Wellardmac View Post
Okay - good to know. Does having them out have any impact on tire wear?

My front tires have worn on the inside edge (a lot faster then the rest of the tire), so I'm pointing the finger at a bad alignment and left wondering if the pins being out contributed.
Very likely alignment is off. Usually toe will have much more impact on tire wear compared to camber. Pulling the pins allows you to dial in more camber, but in my opinion not sufficiently to significantlty impact tire wear. So I suspect your toe settings are off.

By the way, you can always re-adjust the camber settings back to stock without having to re-install the pins.
CanAutM3 is offline   Canada
0
Reply With Quote
      02-13-2013, 07:13 PM   #8
Wellardmac
Ninja World Traveler
 
Wellardmac's Avatar
 
Drives: E90 M3
Join Date: Oct 2011
Location: Apex, NC

Posts: 66
iTrader: (0)

Quote:
Originally Posted by CanAutM3 View Post
Very likely alignment is off. Usually toe will have much more impact on tire wear compared to camber. Pulling the pins allows you to dial in more camber, but in my opinion not sufficiently to significantlty impact tire wear. So I suspect your toe settings are off.

By the way, you can always re-adjust the camber settings back to stock without having to re-install the pins.
Excellent! That's good to know and helps set my mind at ease.

Thanks for the guidance.
__________________
E90 M3 - Interlagos Blue
BMWCCA# 456739
Wellardmac 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 11:44 PM.




m3post
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