Welcome to the North American Subaru Impreza Owners Club Friday August 29, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 12-09-2009, 11:00 PM   #1
chads09
Scooby Newbie
 
Member#: 209076
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Tigard,OR
Vehicle:
2012 sedan
DGM

Default How ECU reacts to EXTREME cold

Its been getting pretty cold lately around here about -10 for a low and 10 for a high. My car is only hitting about 12 psi. Just wanted to see how it would react in these cold temps. Just wondering if anyone could explain how the cars ecu reacts to these cold of temps. I figured temps this low would obviously negatively effect the cars performance.
* Registered users of the site do not see these ads.
chads09 is offline   Reply With Quote
Old 12-10-2009, 08:48 AM   #2
rkramer
Scooby Guru
 
Member#: 118209
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
Vehicle:
2002 WRX Sedan

Default

Quote:
Originally Posted by chads09 View Post
Its been getting pretty cold lately around here about -10 for a low and 10 for a high. My car is only hitting about 12 psi. Just wanted to see how it would react in these cold temps. Just wondering if anyone could explain how the cars ecu reacts to these cold of temps. I figured temps this low would obviously negatively effect the cars performance.
If your tune is on it should be fine, I hit full boost yesterday at -13. There are temp compensation tables down to -40 but the stock tune sets all the values the same below zero IIRC.
rkramer is offline   Reply With Quote
Old 12-10-2009, 04:49 PM   #3
chads09
Scooby Newbie
 
Member#: 209076
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Tigard,OR
Vehicle:
2012 sedan
DGM

Default

Well today it warmed up to 25 and my car is acting normally boosting all the way to 15.
chads09 is offline   Reply With Quote
Old 12-11-2009, 04:22 PM   #4
fragment
Scooby Specialist
 
Member#: 8050
Join Date: Jul 2001
Chapter/Region: W. Canada
Location: Bugeye EJ207 - T3T04S
Vehicle:
2007 Wagon VF36

Default

nothing to add here really...

But -10 isn't EXTREME cold

Subies work fine till -44 and beyond.

Its why they do cold weather testing in places like northern Canada before products are released to market (all major manufacturers do something similar)

As for tuning, I wouldn't mess with the cold tables much, as they seem to be well sorted...
fragment is offline   Reply With Quote
Old 12-11-2009, 07:23 PM   #5
talsnic
Scooby Newbie
 
Member#: 163097
Join Date: Oct 2007
Default

-10 is nothing. i personally enjoy doing big pulls at atleast -30. its like insta-boost.

If your having issues, take a look elsewhere.
talsnic is offline   Reply With Quote
Old 12-14-2009, 01:01 PM   #6
bcblues
Scooby Specialist
 
Member#: 17256
Join Date: Apr 2002
Chapter/Region: MWSOC
Location: America's Outback
Vehicle:
04 STi
Blue w/ custom bug splat

Default

Yeah, here in America's Outback, we typically see at least a couple weeks of -20F temps. turbo cars LOVE cold air! You should NOT be seeing any reduction in boost due to cold temps.

When it gets really cold (below zero, but much more so below -10F), the entire drivetrain will be really cold and any and all grease and oil will be the consistency of clay. That can really increase your parasitic losses and make your car feel sluggish.

You know it is really cold when your seat feels like it is cast in concrete!
bcblues is offline   Reply With Quote
Old 12-15-2009, 02:45 AM   #7
Airboy
Scooby Specialist
 
Member#: 72829
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
EFR6758

Default

Quote:
Originally Posted by bcblues View Post
You should NOT be seeing any reduction in boost due to cold temps.
The 08+ wrx and STi has very drastic reductions in both WGDC and boost targets at low temperatures. In other words, you will see boost drop when it gets cold.
Airboy is online now   Reply With Quote
Old 12-15-2009, 08:31 AM   #8
bcblues
Scooby Specialist
 
Member#: 17256
Join Date: Apr 2002
Chapter/Region: MWSOC
Location: America's Outback
Vehicle:
04 STi
Blue w/ custom bug splat

Default

Thanks for the heads-up, Airboy. I was not aware of those temp compensations in the newer ECUs.

FYI - -16F (air temp) as I type this.

Quote:
Originally Posted by Airboy View Post
The 08+ wrx and STi has very drastic reductions in both WGDC and boost targets at low temperatures. In other words, you will see boost drop when it gets cold.
bcblues is offline   Reply With Quote
Old 12-16-2009, 11:25 PM   #9
96convt
Scooby Specialist
 
Member#: 182092
Join Date: Jun 2008
Chapter/Region: NWIC
Location: WA
Vehicle:
11 titan
White

Default

all i know i that around 15 my car feels like a monster ! but maybe thats due to the 30r who knows
96convt is offline   Reply With Quote
Old 12-21-2009, 04:19 AM   #10
watchunglava
Scooby Specialist
 
Member#: 168862
Join Date: Jan 2008
Chapter/Region: NESIC
Location: Portland Maine
Vehicle:
2007 ej253n/a 5speed
Red Sox Nation Lifer

Default

airboy speeks .... it's over , i run n/a so the colder the better . coldest my impreza has seen was -22.
watchunglava is offline   Reply With Quote
Old 12-21-2009, 11:47 PM   #11
RallyImprezive
Scooby Specialist
 
Member#: 5476
Join Date: Apr 2001
Chapter/Region: RMIC
Location: Castle Rock, Colorado
Vehicle:
2007 WRX UGM
2010 FXT

Default

Quote:
Originally Posted by bcblues View Post
Thanks for the heads-up, Airboy. I was not aware of those temp compensations in the newer ECUs.

FYI - -16F (air temp) as I type this.
The 04 STI has compensations as well. If I remember, I will post of screen shots of the tables tomorrow.
RallyImprezive is offline   Reply With Quote
Old 12-22-2009, 03:28 AM   #12
GlobalWaste
*** Banned ***
 
Member#: 74792
Join Date: Nov 2004
Chapter/Region: VIC
Default

Quote:
Originally Posted by talsnic View Post
-10 is nothing. i personally enjoy doing big pulls at atleast -30. its like insta-boost.

If your having issues, take a look elsewhere.
+1, my wrx was exposed to -30ish temps every winter when I was going snowboarding and the car pulled stronger then ever. (I don't recall any differences in boost either) I loved it


[IMG]http://img.photobucket.com/albums/v623/*************/net/8fbd5681.png[/IMG]
GlobalWaste is offline   Reply With Quote
Old 12-22-2009, 12:39 PM   #13
RallyImprezive
Scooby Specialist
 
Member#: 5476
Join Date: Apr 2001
Chapter/Region: RMIC
Location: Castle Rock, Colorado
Vehicle:
2007 WRX UGM
2010 FXT

Default

Quote:
Originally Posted by RallyImprezive View Post
The 04 STI has compensations as well. If I remember, I will post of screen shots of the tables tomorrow.
oops. I was wrong. There are WGDC compensation tables for intake temp, but there are not any for target boost.

There are comp tables for target boost and coolant temp, but they are zero'd out.
RallyImprezive is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
How would Henry Ford react to today's automakers? AVANTI R5 Non-Subaru News & Rumors 2 06-21-2009 06:46 AM
Not sure how I would react to this.... UberWilhelm Off-Topic 9 02-08-2006 03:09 PM
How does your Subaru React to the Cold? Smart_alek Canada Region Forum 25 01-31-2005 05:14 PM
Extreme Cold oh_BS General Community 13 10-02-2003 09:11 AM
How does the WRX "instantly" react to IC changes? makofoto Factory 2.0L Turbo Powertrain 8 06-02-2003 11:13 AM


All times are GMT -4. The time now is 12:35 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.