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
 
VF Engineering
Post Reply
 
Thread Tools Search this Thread
      04-26-2010, 10:53 PM   #1
niqui
Brigadier General
 
niqui's Avatar
 
Drives: Jet Black E92 M3
Join Date: Feb 2009
Location: Canada

Posts: 3,100
iTrader: (7)

Weather dependent performance?

Hi,
lately I have been wondering if I am nuts or not.
It seems as though the performance of my car varies noticeably based on temperature.
I am not talking extreme temperature differences but say, 12c vs 25 c or so; the car feels like the power button is always on in the cold compared to when it is warmer...I feel like it is getting better now lately, used to the heat or something weird, but in early March to April it was quite noticeable.

I dont know if my performance mods could play a role, but I have an envy intake and vanguard exhaust, thats it.

Just curious, cause oil temp is pretty consistent.
__________________
Jet Black E92 M3
niqui is offline  
0
Reply With Quote
      04-26-2010, 11:28 PM   #2
MrHarris
yodog
 
MrHarris's Avatar
 
Drives: '86 Corolla
Join Date: Jun 2007
Location: Diamond Bar, Ca

Posts: 5,027
iTrader: (5)

Garage List
2009 BMW  [5.00]
Send a message via AIM to MrHarris
I had the same problem. Once I put in a full exhaust and a tune, my car feels very fast even when it's 100degrees outside.

The tune is what really made the difference IMO. Not sure how or why, but the car just pulls hard at 100 degrees, while at 65 degrees it pulls very hard. Whereas just stock, it pulls decent at 100 degrees, and at 65 degrees it pulls hard.

I'd recommend a full x-pipe (catless or HFC), and a tune from a reputable company.

Hope that helps.
__________________

2009 E92 M3 | Alpine White | Black Extended | Advan RS | Turner Test Pipes | Dinan Axle-Back | OETuning | Eibach Springs | UUC SSK | VRS Front Lip | VRS Type I Diffuser | Matte Black | RPi Scoops | MS Filter | Yokohama AD08 | F1 Pinnacle
Special Thanks: Gintani | OETuning | eAs
MrHarris is offline   United_States
0
Reply With Quote
      04-27-2010, 09:30 AM   #3
M3Captain
Banned
 
Drives: M3 and a McDonnell Douglas
Join Date: Jul 2009
Location: NJ

Posts: 579
iTrader: (1)

Atmospheric temperature and pressure, will affect the performance of an NA motor.

Colder temperatures make the air more dense resulting in more HP. Also, high pressure can make it feel like sea level or sometimes even lower.

Conversly, hot temperatures and low pressure can simulate thousands of feet above sea level.

Hope that helps.
M3Captain is offline   Greece
0
Reply With Quote
      04-27-2010, 11:50 AM   #4
FruitCake
Banned
 
Drives: '10 E92 M3
Join Date: Nov 2008
Location: Los Angeles

Posts: 1,680
iTrader: (19)

air temperature and moisture makes a big big difference. On a cold spring day where the air is dry, the car runs like a monster.
FruitCake is offline   Taiwan
0
Reply With Quote
      04-27-2010, 05:26 PM   #5
mixja
Captain
 
Drives: 2011 E90 DCT Silverstone
Join Date: Jun 2008
Location: Beverly Hils, CA

Posts: 783
iTrader: (1)

Many ECUs also can have ignition timing or fuel correction maps based upon atmospheric conditions. So for example, your ECU might currently be programmed for a timing value of 28 degrees at a certain load point at 68F, but at 100F that timing value might be 25 degrees.

I've asked this question before on this forum and PencilGeek said there are no temperature correction maps in the case of the M3.

Like others have said, I do notice a difference in performance - the threshold for "lesser" performance seems to be > 22-24C, however I do live in a humid climate...
mixja is offline   United_States
0
Reply With Quote
      04-27-2010, 06:44 PM   #6
Cab5er
Colonel
 
Cab5er's Avatar
 
Drives: 09 E90 M3 & 07 TL
Join Date: Feb 2007
Location: Fremont, Hainan

Posts: 2,338
iTrader: (22)

I notice it. My car runs better at night in the cool weather. I can hear the gruppeM better at night too. Maybe I'm hallucinating
__________________

E90 ///M3/ AW/ Fox Red
Cab5er is offline   China
0
Reply With Quote
      04-27-2010, 10:03 PM   #7
niqui
Brigadier General
 
niqui's Avatar
 
Drives: Jet Black E92 M3
Join Date: Feb 2009
Location: Canada

Posts: 3,100
iTrader: (7)

thanks for all the info guys, surprising that its so noticeable...thought it would be more extreme temps.
__________________
Jet Black E92 M3
niqui is offline  
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 10:26 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