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 > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
Post Reply
 
Thread Tools Search this Thread
      08-17-2011, 08:00 AM   #1
drchuck72
First Lieutenant
 
drchuck72's Avatar
 
Drives: 2009 BMW M3 Coupe
Join Date: Jan 2011
Location: Toronto, ON

Posts: 358
iTrader: (8)

New Exhaust...Improved fuel economy?

Hey Guys,

Recently had an Eisenmann Race exhaust installed. Sounds fantastic. Couldn't be happier.

Weird thing though, the fuel mileage is at 11.8L/100 km (or 31.8 mpg). Previously, I was getting numbers in the 12.2 to 12.9 L/100km (or 30.7 to 29.1 mpg). Is it possible that the engine is running more efficiently with the freer flowing exhaust?

Thanks

DC
__________________
DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT, EDC, TECH PKG, M Drive. RAC RG63 19x9f ET22 19x10r ET22, Yokohama Advan Neova AD08 265 30R19f 295 30R19r, Ground Control Coilover Conversion, Eisenmann Race Exhaust, AP Racing BBK
drchuck72 is offline   Canada
0
Reply With Quote
      08-17-2011, 08:11 AM   #2
J08M3
Major General
 
J08M3's Avatar
 
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

is it possible you were even getting 29 mpg?
__________________
J08M3 is offline   United_States
0
Reply With Quote
      08-17-2011, 09:33 AM   #3
1MOREMOD
2014 Track Days - 6|Ridge 1:54:61|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,612
iTrader: (5)

I noticed a very slight increase in mileage with my challenge xpipe but that quickly went in the tank with my tune. No one is getting 29 or 31 in these cars. Low 20s is about it if all freeway.
__________________

02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings & bearings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW race|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|
1MOREMOD is offline   United_States
0
Reply With Quote
      08-17-2011, 10:24 AM   #4
884487
New Member
 
Drives: TBD
Join Date: Jun 2011
Location: Canada

Posts: 29
iTrader: (0)

12.2L per 100km is equal to 20 MPG (US)
884487 is offline  
0
Reply With Quote
      08-17-2011, 10:39 AM   #5
aberdeen
Enlisted Member
 
Drives: 135i
Join Date: Aug 2011
Location: California

Posts: 39
iTrader: (0)

less back pressure to a point will be more efficient and can increase mileage. Usually right after you put on exhaust your mpg's go down because you drive faster enjoying the new sound lol
aberdeen is offline   United_States
0
Reply With Quote
      08-17-2011, 11:15 AM   #6
Sean05
Putcha ang ganda...
 
Sean05's Avatar
 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

Posts: 5,286
iTrader: (9)

Send a message via Yahoo to Sean05
same here... after putting a 200 cel x pipe i am currently at 20-22mpg when i had my oem xpipe i was at 17-19 same driving style for the last 2 years...
__________________
Sean05 is offline   Philippines
0
Reply With Quote
      08-17-2011, 11:35 AM   #7
J08M3
Major General
 
J08M3's Avatar
 
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

I had no difference when I had full system compared to stock.
__________________
J08M3 is offline   United_States
0
Reply With Quote
      08-17-2011, 12:20 PM   #8
Bel-Tirid
Private First Class
 
Drives: M3 e92 Interlagos blue
Join Date: Dec 2010
Location: Slovenia

Posts: 112
iTrader: (0)

this is because of drone and more noice with the Eisenman. U control your foot, when u need to be quiter. In my case this is 60% of the driving. Im going under the drone level
Bel-Tirid is offline  
0
Reply With Quote
      08-23-2011, 09:09 AM   #9
drchuck72
First Lieutenant
 
drchuck72's Avatar
 
Drives: 2009 BMW M3 Coupe
Join Date: Jan 2011
Location: Toronto, ON

Posts: 358
iTrader: (8)

Quote:
Originally Posted by 884487 View Post
12.2L per 100km is equal to 20 MPG (US)
Right, I am getting around 32 KMper gallon. I forgot to convert to miles. My bad, I thought that number seemed a bit optimistic. Divide 32 by 1.6 and you get 20. Thank you sir. (you're the one on the left)

In any case, I am getting around 11.8 to 12L per 100km vs 12.9 or higher prior to putting on the exhaust. I open it up regularly ie. I don't drive more conservatively for 2 reasons. One, the drone is at its worst around 2K RPM. So, I try to get it over 2500RPM as quickly as possible. Second, the sound of the exhaust at WOT is addictive.

Bottom line, I love this exhaust.
__________________
DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT, EDC, TECH PKG, M Drive. RAC RG63 19x9f ET22 19x10r ET22, Yokohama Advan Neova AD08 265 30R19f 295 30R19r, Ground Control Coilover Conversion, Eisenmann Race Exhaust, AP Racing BBK
drchuck72 is offline   Canada
0
Reply With Quote
      08-28-2011, 04:45 AM   #10
markjord
Second Lieutenant
 
markjord's Avatar
 
Drives: M3 E92 2007 Jerez Black
Join Date: Aug 2009
Location: Wellingborough

Posts: 282
iTrader: (0)

Well the Eisenmann Race puts out its best noises below 5000 rpm. I just wonder if that encourages us to change up at lower engine speeds. So we're actually driving our M3s slower than before. Having said that I've not noticed better gas mileage with mine. I average about 21 to the UK gallon. Always have.
markjord is offline   United Kingdom
0
Reply With Quote
      08-28-2011, 09:58 PM   #11
GideonPops
New Member
 
Drives: At nite
Join Date: Aug 2011
Location: Jersey Shore

Posts: 26
iTrader: (0)

we didnt buy these fing cars for fuel conservation
GideonPops is offline  
0
Reply With Quote
      08-28-2011, 10:03 PM   #12
1MOREMOD
2014 Track Days - 6|Ridge 1:54:61|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,612
iTrader: (5)

but if it can be a beast and get decent mpg we arent gonna complain. we want it all dont we?
__________________

02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings & bearings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW race|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|
1MOREMOD is offline   United_States
0
Reply With Quote
      08-28-2011, 10:17 PM   #13
e92Mjunky
Second Lieutenant
 
Drives: New wife Alpine CF E92 M3
Join Date: Mar 2011
Location: Austin, TX

Posts: 272
iTrader: (0)

on the highway our DRB Motorsports exhaust seems to get a wee bit better than stock..but in the city it is hard to keep foot out of throttle so therefore city is worse..when you get an exhaust you like, you want to keep hearing it, unfortunately the downside is poor gas mileage
__________________

08' DCT CF Roof, nothing to fancy
custom magnaflow exhaust amd drop in filter
e92Mjunky is offline   United_States
0
Reply With Quote
      08-31-2011, 10:14 AM   #14
drchuck72
First Lieutenant
 
drchuck72's Avatar
 
Drives: 2009 BMW M3 Coupe
Join Date: Jan 2011
Location: Toronto, ON

Posts: 358
iTrader: (8)

Quote:
Originally Posted by GideonPops View Post
we didnt buy these fing cars for fuel conservation
It certainly wasn't one of my primary concerns but as a daily driver, it does come into play.
__________________
DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT, EDC, TECH PKG, M Drive. RAC RG63 19x9f ET22 19x10r ET22, Yokohama Advan Neova AD08 265 30R19f 295 30R19r, Ground Control Coilover Conversion, Eisenmann Race Exhaust, AP Racing BBK
drchuck72 is offline   Canada
0
Reply With Quote
      09-01-2011, 01:07 PM   #15
SRC
SRC
 
SRC's Avatar
 
Drives: 2011 E92 335is
Join Date: Dec 2008
Location: San Francisco Bay Area

Posts: 79
iTrader: (2)

Quote:
Originally Posted by chriszeh View Post
but if it can be a beast and get decent mpg we arent gonna complain. we want it all dont we?
+100, it is a performance based factor... anyone can make a big motor produce big power but how efficient is it? This car is very efficient compared to almost every other sport car on the planet. Advancing the state of this art is one of the reasons I read this forum. But all too often the knuckle draggers are the loudest posts…
__________________
Information is power
Power to the people!

2014 F13 650i Msport Delivery Scheduled 4-18-14
SRC 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 07:16 AM.




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