Fi Exhaust
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 > Suspension | Brakes | Chassis

Post Reply
 
Thread Tools Search this Thread
      02-15-2020, 08:00 PM   #1
Megabass
Second Lieutenant
161
Rep
256
Posts

Drives: 2019 M4 CP
Join Date: Oct 2018
Location: Copperopolis

iTrader: (0)

Wheel spacers affect performance

Do wheel spacers have a negative affect on performance in anyway? I have an M3cs and paid for the special tuning, I'd hate to ruin the dynamics.

Also wondering if I did the M-performance adjustable, coil-overs would I adversely affect the car.

Thanks in advance for your input.
Appreciate 0
      02-15-2020, 08:25 PM   #2
jmg
Lieutenant General
jmg's Avatar
United_States
15641
Rep
13,013
Posts

Drives: G82 M4 Comp X-Drive, i3 LCI
Join Date: Mar 2013
Location: Orange County, CA

iTrader: (1)

Garage List
2022 G82 M4C X-Drive  [0.00]
2018 F80 M3 CS  [0.00]
2019 i3 BEV  [0.00]
Spacers are used in competition and track use, so as long as you aren't going with crazy offset and 20mm+ spacers you shouldn't see significant affect in performance. In fact a wider stance might be desirable to increase your track. I'd always try and use the thinnest spacer you can get away with to minimize any affects to the dynamics. Also keep in mind that you can change the balance of the car slightly by not getting matching widths front and back. Wider in the back increases grip in the back, wider in front increases grip in front etc.
__________________

2022 G82///M4 Competition X-Drive - KW-HAS, EBC Bluestuff, Millway Race Camber Plates, PSI High Flow Midpipe, Lightweight Front Lip, M Perf Flow Through Wing
Previous 2018 F80 ///M3 CS 2016 F80 ///M3
Appreciate 1
Megabass161.00
      02-15-2020, 08:28 PM   #3
Megabass
Second Lieutenant
161
Rep
256
Posts

Drives: 2019 M4 CP
Join Date: Oct 2018
Location: Copperopolis

iTrader: (0)

Quote:
Originally Posted by jmg View Post
Spacers are used in competition and track use, so as long as you aren't going with crazy offset and 20mm+ spacers you shouldn't see significant affect in performance. In fact a wider stance might be desirable to increase your track. I'd always try and use the thinnest spacer you can get away with to minimize any affects to the dynamics. Also keep in mind that you can change the balance of the car slightly by not getting matching widths front and back. Wider in the back increases grip in the back, wider in front increases grip in front etc.
Thanks, great logical response.
Appreciate 0
      02-16-2020, 11:04 AM   #4
CanAutM3
General
CanAutM3's Avatar
Canada
19865
Rep
20,322
Posts

Drives: 2021 911 turbo
Join Date: Jan 2012
Location: Montreal

iTrader: (1)

Garage List
Altering the stock offset will have an effect on suspension tuning.

Reducing the offset with spacers increases the track. A wider track means less weight transfer during cornering which in turn yields more total grip. As jmg pointed out, changing track width differently front and rear will affect the handling balance of the car (over/understeer).

Changing offsets also aters the wheel to spring/damper movement ratio, which essentially changes the effective spring and damping rates. Albeit by relatively small amounts.

IMO, the biggest negative drawback of changing offsets is on the front axle due to the effect on scrub radius and required Ackerman angle when the wheels are steered. It can adversly affect steering feel and feedback and reduce front end grip due to increased scrub (and consequently increase front tire wear).
__________________
Porsche 911 turbo 2021 992 GT Silver

Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
Appreciate 2
Megabass161.00
jmg15640.50
      02-16-2020, 11:08 AM   #5
Megabass
Second Lieutenant
161
Rep
256
Posts

Drives: 2019 M4 CP
Join Date: Oct 2018
Location: Copperopolis

iTrader: (0)

Quote:
Originally Posted by CanAutM3 View Post
Altering the stock offset will have an effect on suspension tuning.

Reducing the offset with spacers increases the track. A wider track means less weight transfer during cornering which in turn yields more total grip. As jmg pointed out, changing track width differently front and rear will affect the handling balance of the car (over/understeer).

Changing offsets also aters the wheel to spring/damper movement ratio, which essentially changes the effective spring and damping rates. Albeit by relatively small amounts.

IMO, the biggest negative drawback of changing offsets is on the front axle due to the effect on scrub radius and required Ackerman angle when the wheels are steered. It can adversly affect steering feel and feedback and reduce front end grip due to increased scrub (and consequently increase front tire wear).
So with that said if you go to just a wider wheel does it have the same affect on suspension dampening? Thanks guys great information
Appreciate 0
      02-16-2020, 12:46 PM   #6
CanAutM3
General
CanAutM3's Avatar
Canada
19865
Rep
20,322
Posts

Drives: 2021 911 turbo
Join Date: Jan 2012
Location: Montreal

iTrader: (1)

Garage List
Quote:
Originally Posted by Megabass View Post
So with that said if you go to just a wider wheel does it have the same affect on suspension dampening? Thanks guys great information
In general terms, the forces transmitted by the tires balance out at the wheel centerline. So as long as the offset is maintained and all else being equal, a wider wheel will have no effect on the above.
__________________
Porsche 911 turbo 2021 992 GT Silver

Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
Appreciate 2
Megabass161.00
jmg15640.50
      02-16-2020, 12:48 PM   #7
Megabass
Second Lieutenant
161
Rep
256
Posts

Drives: 2019 M4 CP
Join Date: Oct 2018
Location: Copperopolis

iTrader: (0)

Quote:
Originally Posted by CanAutM3 View Post
Quote:
Originally Posted by Megabass View Post
So with that said if you go to just a wider wheel does it have the same affect on suspension dampening? Thanks guys great information
In general terms, the forces transmitted by the tires balance out at the wheel centerline. So as long as the offset is maintained and all else being equal, a wider wheel will have no effect on the above.
Thank you!
Appreciate 1
CanAutM319865.00
      02-16-2020, 07:36 PM   #8
gatorfast
Major General
gatorfast's Avatar
United_States
4546
Rep
6,724
Posts

Drives: 718 Cayman
Join Date: Jan 2008
Location: SoFla

iTrader: (4)

Unless you are an advanced track driver I highly doubt you will notice any difference whatsoever running spacers.
Appreciate 2
Megabass161.00
jmg15640.50
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 05:05 PM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, 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