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11-29-2005, 11:35 AM | #1 |
Scooby Guru
Member#: 80663
Join Date: Jan 2005
Chapter/Region:
SWIC
Location: Glendale, AZ
Vehicle:2005 STi |
Should I make adjustments for different altitudes/temps?
I live in Phoenix (1100 ft. elevation). I had my STi tuned for 91 and 100 octane (cobb streetTuner). When I had it tuned though, it was about 80-85 degrees inside the garage. Now that it is winter, and I will be making some road trips, should I make any adjustment to my map? Specifically, going to southern california (roughly same temps, but sea level and crappy gas). Also, how 'bout if I go into the mountains where it would be around 20-25 degress and 5000 ft. elevation?
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11-29-2005, 01:10 PM | #2 |
Scooby Specialist
Member#: 1871
Join Date: Jul 2000
Location: Salt Lake City, UT
Vehicle:2000 Impreza 2.5RS Blue Ridge Pearl |
The ECU has lots of routines to deal with elevation and weather changes to keep your engine safe and happy.
However, it wouldn't be a terrible idea to keep your laptop w/ ST w/ you, on the chance that your tune is too aggressive and the changes are extreme. Mostly I'd be concerned about the boost levels being beyond the efficiency of the turbo at high altitude. If you have a 91 octane map, then you may be ok w/ CA gas. It depends on how different AZ 91 is from CA 91... I can't speak on that. |
11-29-2005, 01:15 PM | #3 |
Scooby Specialist
Member#: 88322
Join Date: Jun 2005
Chapter/Region:
MWSOC
Location: Indianapolis, IN
Vehicle:2009 BMW 135i |
Logging should give you an answer, but I agree that the stock ECU should be very forgiving for climate and gas changes.
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11-29-2005, 01:44 PM | #4 |
Scooby Specialist
Member#: 56468
Join Date: Mar 2004
Chapter/Region:
NWIC
Location: Seattle, WA
Vehicle:04 Improved STI Dirty White |
MAF based systems are very forgiving when it comes to environmental changes. MAP based systems have a little more trouble with temp changes, but even they can be mapped to deal with most situations adequately.
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11-29-2005, 02:00 PM | #5 |
Scooby Guru
Member#: 80663
Join Date: Jan 2005
Chapter/Region:
SWIC
Location: Glendale, AZ
Vehicle:2005 STi |
alrighty...sounds like I shouldn't be too worried. I'll basically just try to keep the octane a little higer than normal. Thx for easing my worry.
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11-29-2005, 11:43 PM | #6 |
Scooby Specialist
Member#: 75122
Join Date: Nov 2004
Chapter/Region:
SCIC
Location: Im in a glass case of emotion
Vehicle:2005 Impreza WRX Wag White |
The Stock ECU is very smart and it will accomidate for altitude and elevation changes.
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12-01-2005, 01:02 AM | #7 | |
Scooby Guru
Member#: 80663
Join Date: Jan 2005
Chapter/Region:
SWIC
Location: Glendale, AZ
Vehicle:2005 STi |
Quote:
As nice as the learning is on the modern ECUs, it is still does most (or all?) of its correcting AFTER an event. Kinda funny scenario...Ah crap, that explosion was huge. We just blew up the whole thing...hmm, alright then lets use less dynamite on the...uh, wait, its all blown up, doh! I will say...my tunes were on the 'conservative' side, so I think it'll be fine. Now to get this knocklite installed |
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