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
      02-15-2012, 07:51 AM   #1
Bubbles
Green Bastard
 
Bubbles's Avatar
 
Drives: ZCP-Powered
Join Date: Jun 2007
Location: Bishop Bend

Posts: 3,550
iTrader: (3)

Akrapovic Evol -- better gas mileage?

I notice this past weekend that at cruising speed, I'm now getting 20.7 mpg vs 18.3 mpg with the stock setup on the same road at the same speed with similar weather conditions. Anyone else experience this?

Can weight reduction and high flow cats make that much of a difference? I'm not running a tune just the Akra-Delete.
__________________
Bubbles is offline   Cayman Islands
0
Reply With Quote
      02-15-2012, 09:06 AM   #2
THE TECH
BimmerPost Supporting Vendor

 
THE TECH's Avatar
 
Drives: BPMsport 2012 E92 M3
Join Date: Jun 2011
Location: Kansas

Posts: 13,094
iTrader: (44)

Garage List
Send a message via AIM to THE TECH Send a message via Skype™ to THE TECH
I think you would need to average at least a couple of tanks of fuel to determine whether it is making that difference or not.
__________________
THE TECH is offline   United_States
0
Reply With Quote
      02-15-2012, 10:08 AM   #3
Bubbles
Green Bastard
 
Bubbles's Avatar
 
Drives: ZCP-Powered
Join Date: Jun 2007
Location: Bishop Bend

Posts: 3,550
iTrader: (3)

Quote:
Originally Posted by THE TECH View Post
I think you would need to average at least a couple of tanks of fuel to determine whether it is making that difference or not.

It's been more than a few tanks More than I'd like to admit. ~ 1000 miles of driving

I manually calculate my gas mileage as well.

It may be the summer fuel brew that stations are switching too as well.
__________________
Bubbles is offline   Cayman Islands
0
Reply With Quote
      02-15-2012, 10:11 AM   #4
THE TECH
BimmerPost Supporting Vendor

 
THE TECH's Avatar
 
Drives: BPMsport 2012 E92 M3
Join Date: Jun 2011
Location: Kansas

Posts: 13,094
iTrader: (44)

Garage List
Send a message via AIM to THE TECH Send a message via Skype™ to THE TECH
Quote:
Originally Posted by Bubbles View Post
It's been more than a few tanks More than I'd like to admit. ~ 1000 miles of driving

I manually calculate my gas mileage as well.

It may be the summer fuel brew that stations are switching too as well.
Gotcha. Well a more freely flowing exhaust coupled with the weight difference could definitely help things out.
__________________
THE TECH is offline   United_States
0
Reply With Quote
      02-15-2012, 10:20 AM   #5
armyav8tor
n1smo
 
armyav8tor's Avatar
 
Drives: E92 M3
Join Date: Apr 2008
Location: North Carolina

Posts: 1,447
iTrader: (1)

Garage List
I want to say yes, but it is hard to determine because I'm heavier on the gas pedal now. My Fuelly has me averaging right at around 17mpg and a lot of those miles are with the Akrapovic.

armyav8tor is offline   United_States
0
Reply With Quote
      02-15-2012, 11:11 AM   #6
Bubbles
Green Bastard
 
Bubbles's Avatar
 
Drives: ZCP-Powered
Join Date: Jun 2007
Location: Bishop Bend

Posts: 3,550
iTrader: (3)

Quote:
Originally Posted by THE TECH View Post
Gotcha. Well a more freely flowing exhaust coupled with the weight difference could definitely help things out.
I didn't think it would be that significant, another plus for a fine piece of engineering genius.
__________________
Bubbles is offline   Cayman Islands
0
Reply With Quote
      02-15-2012, 11:12 AM   #7
Bubbles
Green Bastard
 
Bubbles's Avatar
 
Drives: ZCP-Powered
Join Date: Jun 2007
Location: Bishop Bend

Posts: 3,550
iTrader: (3)

Quote:
Originally Posted by armyav8tor View Post
I want to say yes, but it is hard to determine because I'm heavier on the gas pedal now. My Fuelly has me averaging right at around 17mpg and a lot of those miles are with the Akrapovic.

Understood, that's why it took me some highway driving to actually see the difference.
__________________
Bubbles is offline   Cayman Islands
0
Reply With Quote
      02-15-2012, 10:47 PM   #8
redline9001
Captain
 
redline9001's Avatar
 
Drives: E92 M3, MDX, Titan
Join Date: Apr 2011
Location: Calgary, Canada

Posts: 655
iTrader: (0)

Mine improved by about a 1/2 mpg... No difference really
__________________
2011 E92 M3 | JEREZ BLACK | EXTENDED BAMBOO NOVILLO | EXECUTIVE PKG | M-DRIVE | EDC | M-DCT
MODS | KW S/O | HRE P40SC | Akra Evo |ESS Akra Tune | BMC drop in | StopTech Trophies | TMS Pulley | LUX V3
redline9001 is offline   Canada
0
Reply With Quote
      02-23-2012, 10:01 AM   #9
M3people
Second Lieutenant
 
M3people's Avatar
 
Drives: E92 M3
Join Date: Dec 2011
Location: NYC/Frankfurt

Posts: 254
iTrader: (0)

I have everything stock and I am averaging 14.6 mpg and barely getting 200 miles per tank, any idea how I can improve the mpg??
M3people is offline   United_States
0
Reply With Quote
      02-23-2012, 10:02 AM   #10
Sean05
Putcha ang ganda...
 
Sean05's Avatar
 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

Posts: 5,331
iTrader: (9)

Send a message via Yahoo to Sean05
Yes i got at least 2MPG more on my AKRA... weird... ha... LOL
__________________
Sean05 is offline   Philippines
0
Reply With Quote
      02-23-2012, 10:33 AM   #11
GIdriver
Major
 
GIdriver's Avatar
 
Drives: 2012 C63 AMG P31
Join Date: Dec 2010
Location: Somewhere in Time

Posts: 1,341
iTrader: (0)

Quote:
Originally Posted by M3people View Post
I have everything stock and I am averaging 14.6 mpg and barely getting 200 miles per tank, any idea how I can improve the mpg??
Lighten your right foot!!
GIdriver is offline   United_States
0
Reply With Quote
      02-23-2012, 10:34 AM   #12
GIdriver
Major
 
GIdriver's Avatar
 
Drives: 2012 C63 AMG P31
Join Date: Dec 2010
Location: Somewhere in Time

Posts: 1,341
iTrader: (0)

It seems like another reason to get the EVO system!!
GIdriver is offline   United_States
0
Reply With Quote
      02-23-2012, 05:05 PM   #13
Bubbles
Green Bastard
 
Bubbles's Avatar
 
Drives: ZCP-Powered
Join Date: Jun 2007
Location: Bishop Bend

Posts: 3,550
iTrader: (3)

Quote:
Originally Posted by Sean05 View Post
Yes i got at least 2MPG more on my AKRA... weird... ha... LOL

I knew it, this system is nearly perfect.
__________________
Bubbles is offline   Cayman Islands
0
Reply With Quote
      02-23-2012, 05:55 PM   #14
Sean05
Putcha ang ganda...
 
Sean05's Avatar
 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

Posts: 5,331
iTrader: (9)

Send a message via Yahoo to Sean05
Quote:
Originally Posted by Bubbles View Post
I knew it, this system is nearly perfect.
haha yea not im back oem xpipe im down to 19-20... with xpipe primary cat delete secondary and resonator i get 21-23... insane ha... LOL
__________________
Sean05 is offline   Philippines
0
Reply With Quote
      07-18-2013, 01:23 AM   #15
fongpi
Jedi Poltergeist
 
Drives: 2011 BMW M3 6MT ZCP
Join Date: Mar 2012
Location: Southern California

Posts: 166
iTrader: (0)

Quote:
Originally Posted by Bubbles View Post
I notice this past weekend that at cruising speed, I'm now getting 20.7 mpg vs 18.3 mpg with the stock setup on the same road at the same speed with similar weather conditions. Anyone else experience this?

Can weight reduction and high flow cats make that much of a difference? I'm not running a tune just the Akra-Delete.
OP, over a year later, what has your experience been?
fongpi is offline  
0
Reply With Quote
      07-18-2013, 10:48 AM   #16
Longwong
Banned
 
Drives: e92 m3 catless
Join Date: Jun 2013
Location: USA

Posts: 371
iTrader: (0)

If air temps have been equal and not much cooler than catless or HFC of course can improve efficiency. Less pumping losses against the backpressure of a cat. Problem like most is when I went catless I loved the sound and had a heavier foot but agree my cruising mpg improved
Longwong is offline  
0
Reply With Quote
      07-18-2013, 12:29 PM   #17
signes
Brigadier General
 
signes's Avatar
 
Drives: E90 M3
Join Date: Sep 2008
Location: Spinnin at 8k

Posts: 4,200
iTrader: (3)

I went up about 1.5mpg with the full Evo relative to stock.
__________________
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18
signes is offline   United_States
0
Reply With Quote
      07-18-2013, 12:43 PM   #18
momo3605
Captain
 
Drives: 328i M Sport
Join Date: Aug 2012
Location: Norcal

Posts: 863
iTrader: (0)

More exhaust flow makes the engine run richer, so your gas mileage should go down. Better gas mileage from a full exhaust is a very interesting thought. But I think you guys must be trying harder to press the gas less while freeway cruising. Placebo
momo3605 is offline  
0
Reply With Quote
      07-18-2013, 01:13 PM   #19
Longboarder
Brigadier General
 
Drives: 2013 e92 M3
Join Date: Dec 2006
Location: Monarch Beach

Posts: 3,690
iTrader: (1)

Garage List
2011 997.2 Turbo S  [4.71]
2013 e92 M3  [4.55]
2013 WRX STi  [4.00]
2013 BMW X5  [0.00]
After installing my blower and Akra exhaust I'm now getting 30+ MPG.
__________________
Daily: 2013 e92 M3 DCT / ESS VT2 650 S/C / Akrapovic Evolution / StopTech BBK
Track/Airstrip: 2011 997.2 Turbo S PDK / 725 HP / BBi suspension build
Beater: 2013 X5 3.5sport
YouTube Channel: https://www.youtube.com/channel/UCT1...eoFBszPIK0gf9w
Longboarder is offline  
0
Reply With Quote
      07-18-2013, 08:03 PM   #20
L4ces
Captain
 
L4ces's Avatar
 
Drives: 2008 E92 M3 Alpine White
Join Date: Aug 2010
Location: Nj

Posts: 675
iTrader: (0)

Garage List
2008 M3  [0.00]
Quote:
Originally Posted by Longboarder
After installing my blower and Akra exhaust I'm now getting 30+ MPG.
Not funny.
L4ces is offline   United_States
0
Reply With Quote
      07-19-2013, 12:54 AM   #21
Longwong
Banned
 
Drives: e92 m3 catless
Join Date: Jun 2013
Location: USA

Posts: 371
iTrader: (0)

Quote:
Originally Posted by momo3605 View Post
More exhaust flow makes the engine run richer, so your gas mileage should go down. Better gas mileage from a full exhaust is a very interesting thought. But I think you guys must be trying harder to press the gas less while freeway cruising. Placebo
huh? Exhaust flow or less restriction aka lower pumping losses do nothing to the AFR which is a target based loop feedback via the computer based on load, temps etc.

It is the increase in VE and decreased pumping losses that lead to the hp increase
Longwong is offline  
0
Reply With Quote
      07-19-2013, 07:07 AM   #22
ibmike
What the Hell ?
 
ibmike's Avatar
 
Drives: 2011 M3 e92 DCT
Join Date: May 2013
Location: Michigan

Posts: 1,518
iTrader: (6)

My gas mileage improved when i added a Dinan intake and pulley kit, cant wait to see what happens when i get a Evo exhaust.
__________________
Life's a Bitch,Just make sure that Bitch is Beautiful.
ibmike 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 09:23 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