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 > Wheels + Tires Sponsored by The Tire Rack
  TireRack

KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK!
Post Reply
 
Thread Tools Search this Thread
      04-02-2008, 12:51 PM   #1
GarryF
First Lieutenant
United Kingdom
34
Rep
330
Posts

Drives: SSII E90 M3
Join Date: Nov 2007
Location: UK

iTrader: (0)

18" more fuel efficient than 19" ?

I was reading a thread on mtorque about someone swapping from 19" to 18" wheels on a E46 M3, he claims he's getting 2mpg better efficiency after the swap?

Anyone ever heard of this? would be a good argument for the 18" wheels
Appreciate 0
      04-02-2008, 01:32 PM   #2
BCMPOWER
Captain
BCMPOWER's Avatar
United_States
29
Rep
626
Posts

Drives: 08 Silverstone II M3
Join Date: Dec 2007
Location: Silver Spring MD

iTrader: (0)

less rotational mass would make the car slightly more efficient, I have seen better fuel economy from switch from my 19's to the 17 inch wheels. For 2 MPG however I would not give up the look of the 19's
__________________
Appreciate 0
      04-02-2008, 03:15 PM   #3
GregW / Oregon
Commander-In-Chief
2067
Rep
8,898
Posts

Drives: 2023 M2 Coupe, 2020 GLE 450
Join Date: Nov 2005
Location: Lake Oswego, OR

iTrader: (3)

Garage List
Quote:
Originally Posted by GarryF View Post
I was reading a thread on mtorque about someone swapping from 19" to 18" wheels on a E46 M3, he claims he's getting 2mpg better efficiency after the swap?

Anyone ever heard of this? would be a good argument for the 18" wheels
No. Any differences are negligible.
__________________

Greg Lake Oswego, Oregon, USA
2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450
Appreciate 0
      04-02-2008, 03:55 PM   #4
sayemthree
Major General
sayemthree's Avatar
594
Rep
5,448
Posts

Drives: ‘20 X3mC ‘20 Raptor ‘04 X3 6mt
Join Date: Aug 2007
Location: usa so cal , AZ

iTrader: (0)

prob not - but if you mount 5 inch wheels with 185's on them you will.
__________________
Fore Sale Rare 6 speed manual X3 3.oi silver over grey. PM me
Appreciate 0
      04-14-2008, 03:28 PM   #5
exadius
Private
United_States
3
Rep
90
Posts

Drives: Space Grey E92 M3 M-DCT
Join Date: Mar 2008
Location: Seattle, WA

iTrader: (0)

If gas mileage means that much, you should not be buying an M3. I don't know what my mpg is on my RS4 and I won't be keeping track of it on my new M3. Face it if you drive an M3 agressivly your mpg will be like a big SUV no mater what size wheels you use.
Appreciate 0
      04-14-2008, 03:35 PM   #6
E90330iS
Major General
Germany
143
Rep
6,333
Posts

Drives: BMW M4
Join Date: Jan 2006
Location: Arcadia, California

iTrader: (56)

Garage List
2006 330i  [0.00]
Yes definitely matters. I switched from 18"s to 19"s and it dropped about 1-2mpg also. My car is definitely not as swift either.
__________________
Appreciate 0
      04-14-2008, 05:28 PM   #7
OzStriker
Captain
OzStriker's Avatar
Australia
61
Rep
924
Posts

Drives: Ford Falcon Ute, Ducati 1198S
Join Date: Sep 2007
Location: Melbourne

iTrader: (1)

Garage List
I suspect simply bumping up your pressures on long highway trips will make a bigger difference than switching 18s and 19s.

+1 on why you would care in the M3 though.
__________________
BMW E92 M3 6MT, G-Power SKII supercharged, custom exhaust with 100 cell cats and Remus Sport mufflers, Brembo 380mm BBK, BMW Performance steering wheel, LUX H8 angel eyes, CF CSL boot, Hamann CF diffuser, Vorsteiner CF lip, CF grilles, CF gills, CF bonnet vents, BMW Performance stripes, RAC RG63 wheels, Eibach lowering springs, camber modifications.
Appreciate 0
      06-04-2008, 09:36 PM   #8
ericld
Second Lieutenant
24
Rep
237
Posts

Drives: 2008 BMW E92 M3, Alpine White
Join Date: May 2008
Location: CO

iTrader: (0)

It takes a lot more torque energy to initiate rotation with the 20/19's. Any acceleration, standing or rolling, is negatively affected by a larger circumference.

That being said, a car with 19's or 20's will coast further so any MPG loss is washed away by that gain.
Appreciate 0
      06-04-2008, 10:51 PM   #9
euro
Grand Am Timing Official
United_States
11
Rep
162
Posts

Drives: 2008 E92 M3, 2018 Ford Raptor
Join Date: Mar 2008
Location: Winchester, VA

iTrader: (0)

just something to think about, I heard that the 18" wheels were lighter than the 19's

but add the tires and the 19's were lighter...

so with that fact, the 19's should get the better mileage.
__________________
18 Ford Raptor SuperCrew 802A black on black
08 E92 M3 AW 6MT with Macht Schnell 75mm stud kit, RE-71R's 255/275, M3 Edition black grills, ZCP rear spoiler, exhaust mod
Appreciate 0
      06-05-2008, 10:51 AM   #10
footie
Major General
footie's Avatar
No_Country
1072
Rep
8,008
Posts

Drives: i4M50
Join Date: Oct 2007
Location: No where fast

iTrader: (0)

Garage List
I would be surprised to find much if any a difference in economy, both are the same width and both have roughly the same circumference. So personally I doubt it's true, maybe it's the unsprung weight coming into play.
Appreciate 0
      06-05-2008, 11:25 AM   #11
J08M3
Major General
J08M3's Avatar
United_States
285
Rep
6,007
Posts

Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

iTrader: (8)

I would imagine the only thing that could make a 2 mpg difference would be a different circumference. Any other variable would be such a small change I don't think you would even notice.
__________________
Appreciate 0
      06-05-2008, 11:31 AM   #12
GregW / Oregon
Commander-In-Chief
2067
Rep
8,898
Posts

Drives: 2023 M2 Coupe, 2020 GLE 450
Join Date: Nov 2005
Location: Lake Oswego, OR

iTrader: (3)

Garage List
Wheels and mileage

Quote:
Originally Posted by footie View Post
I would be surprised to find much if any a difference in economy, both are the same width and both have roughly the same circumference. So personally I doubt it's true, maybe it's the unsprung weight coming into play.
Agree--any differences will be infinitessimal. The diameters are the same and weight is within a pound or so between OEM 18s and 19s. Now put on heavy cast 20s with 295mm rears and there might be a small measurable difference.
__________________

Greg Lake Oswego, Oregon, USA
2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450
Appreciate 0
      06-05-2008, 11:38 AM   #13
GT3 Tim
Moderator
GT3 Tim's Avatar
United_States
94
Rep
1,920
Posts

Drives: 2014 MB E63S
Join Date: Feb 2008
Location: Sacramento, CA

iTrader: (0)

Quote:
Originally Posted by GregW / Oregon View Post
Agree--any differences will be infinitessimal. The diameters are the same and weight is within a pound or so between OEM 18s and 19s. Now put on heavy cast 20s with 295mm rears and there might be a small measurable difference.
Yea...lol. Fuel mileage down, bling factor up! lol
__________________
Tim <--- apparently likes "3" cars
2014 E63S -- The Rocket
2014 F30 328i -- Kids car
2008 E90 M3 -- Sold
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold
Appreciate 0
      06-05-2008, 06:37 PM   #14
Blip Bavarian
salivator
Blip Bavarian's Avatar
United_States
38
Rep
539
Posts

Drives: 16 GT4, 14 X5 V8 & 91 E30 LS1
Join Date: Dec 2007
Location: El Paso, Texas

iTrader: (0)

the OEM 19's w/ tires are lighter than the OEM 18's w/ tires....
Appreciate 0
      06-21-2008, 01:54 AM   #15
sayemthree
Major General
sayemthree's Avatar
594
Rep
5,448
Posts

Drives: ‘20 X3mC ‘20 Raptor ‘04 X3 6mt
Join Date: Aug 2007
Location: usa so cal , AZ

iTrader: (0)

no - the 19's weigh less - they should get bttr MPG.
__________________
Fore Sale Rare 6 speed manual X3 3.oi silver over grey. PM me
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



All times are GMT -5. The time now is 05:04 AM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, 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