winter map

alphagoose · 10-25-2007, 08:39 AM

i bought an xpt stg 2 map with gm bcs map for my 04 wagon. i was wondering how hard it would be to change the map to make a winter map. lower boost is mainly what id like.

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Broxma · 10-25-2007, 02:34 PM

Not hard at all. Air density in cold weather might change by 10% at most I'd say so you can just drop your boost targets by 10% or so. Will probably run rich at WOT when you go open loop but you can adjust those to if needed. The ECU might be able to compensate for that a little, even if you left the fuel map alone.

/Brox

Freon · 10-25-2007, 04:53 PM

Reflashes should not need to be specially winterized if the map is setup well to begin with.

alphagoose · 10-25-2007, 10:08 PM

Quote:

Originally Posted by Freon

Reflashes should not need to be specially winterized if the map is setup well to begin with.

yea i just dont wnat to run as much boost in the winter. figure i might be safer that way.

quazimoto · 10-26-2007, 02:56 PM

I would rather run more boost in the winter if i have the fuel for it.

Freon · 10-26-2007, 04:26 PM

There are compensation maps for boost control to do this. That's one of the nicer points of the stock ECUs. Mainly there is a wastegate duty and timing compensations based on intake air temp.

The colder inlet air and colder air over the intercooler means you're flowing a lot more air at the same boost. Higher loads for sure. Spool improves, you need less wastegate duty, etc. Add more boost on top of that and you're *really* flowing a lot more air and definitely making more power. I guess I don't care to set up my car to do that when I'm running poorer tires in poorer conditions. YMMV.

10-25-2007, 08:39 AM	#1
alphagoose Scooby Newbie Member#: 158302 Join Date: Sep 2007 Chapter/Region: NESIC Vehicle: 2004 wrx wagon	winter map i bought an xpt stg 2 map with gm bcs map for my 04 wagon. i was wondering how hard it would be to change the map to make a winter map. lower boost is mainly what id like. * Registered users of the site do not see these ads.

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10-25-2007, 02:34 PM	#2
Broxma Scooby Specialist Member#: 158006 Join Date: Aug 2007 Chapter/Region: TXIC Location: San Antonio Vehicle: 2003 WRX IdleWagon 1992 GVR4 379/1000	Not hard at all. Air density in cold weather might change by 10% at most I'd say so you can just drop your boost targets by 10% or so. Will probably run rich at WOT when you go open loop but you can adjust those to if needed. The ECU might be able to compensate for that a little, even if you left the fuel map alone. /Brox

10-25-2007, 04:53 PM	#3
Freon Scooby Specialist Member#: 88322 Join Date: Jun 2005 Chapter/Region: MWSOC Location: Indianapolis, IN Vehicle: 2009 BMW 135i	Reflashes should not need to be specially winterized if the map is setup well to begin with.

10-26-2007, 02:56 PM	#5
quazimoto Scooby Guru Member#: 70395 Join Date: Sep 2004 Chapter/Region: MAIC Location: Da-boonies,Va	I would rather run more boost in the winter if i have the fuel for it.

10-26-2007, 04:26 PM	#6
Freon Scooby Specialist Member#: 88322 Join Date: Jun 2005 Chapter/Region: MWSOC Location: Indianapolis, IN Vehicle: 2009 BMW 135i	There are compensation maps for boost control to do this. That's one of the nicer points of the stock ECUs. Mainly there is a wastegate duty and timing compensations based on intake air temp. The colder inlet air and colder air over the intercooler means you're flowing a lot more air at the same boost. Higher loads for sure. Spool improves, you need less wastegate duty, etc. Add more boost on top of that and you're really flowing a lot more air and definitely making more power. I guess I don't care to set up my car to do that when I'm running poorer tires in poorer conditions. YMMV.