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Old 11-29-2005, 11:35 AM   #1
shemoves
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Default 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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Old 11-29-2005, 01:10 PM   #2
mrbell
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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.
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Old 11-29-2005, 01:15 PM   #3
Freon
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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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Old 11-29-2005, 01:44 PM   #4
bboy
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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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Old 11-29-2005, 02:00 PM   #5
shemoves
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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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Old 11-29-2005, 11:43 PM   #6
darksands
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The Stock ECU is very smart and it will accomidate for altitude and elevation changes.
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Old 12-01-2005, 01:02 AM   #7
shemoves
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Quote:
Originally Posted by darksands
The Stock ECU is very smart and it will accomidate for altitude and elevation changes.
I know it can adjust...but I am already running it closer to the limit than stock...I didn't want something to push it over the edge before it had time to fix it (assuming it had enough room to compensate at all).

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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