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Old 09-11-2005, 11:54 AM   #1
REXRED04
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Default At altitude: Running extremely rich AP stage II

alrite here is the deal.. i have had the accessport now for about 4 months. and i have a a/f guage to monitor vitals.. i am catless. but i am at almost 6k feet elevation... and i run extremely rich up here in colorado... always all the way over in the rich side of the guage during load. and constantly cleaning the black soot off the exhaust tips.. any suggestions or do i just need a custom tune for the high elevation? thanks again guys...
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Old 09-11-2005, 12:19 PM   #2
hondaeater69
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rich side of the gauge? Do you have a specific AFR @ XX RPM? Without that you're shooting in the dark. And the OTS maps are designed to be rich. My OTS map would hit in the 10's. . .
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Old 09-11-2005, 03:24 PM   #3
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Of course you are running rich, there's less air up there to burn your fuel.
However, since your fueling is based on MAF, differences in the air pressure should be accounted for. That said, tuners can be lazy and only tune to the peak WOT, leaving lower load levels rich (safe). At altitude you could well be in a lower load level than what has not been accurately tuned.

I'd say you best option is a custom tune, one which tunes at peak boost, but also lower boost levels (that you might have at altitude). I'd try your local Mountain States forum for more local assistance.
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Old 09-11-2005, 09:10 PM   #4
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Well, the Cobb tunes are at around 4500-5000 feet right? I live at 4500 feet, and it has been running well with one cat in the dp, stock cat back, and stage 2. I only have the stock O2 sensor to go by, but I do stay just above 11:1 most of the time when I log.
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Old 09-15-2005, 12:58 PM   #5
REXRED04
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Thanks for the data guys.. i dont have specific afr.. gona have to get a logger... i had figured that alot of it had to do with the altitude.. anyone know of a pro-tuner in Colorado?? thanks...
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Old 09-15-2005, 01:01 PM   #6
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Old 09-15-2005, 01:18 PM   #7
hippy
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Your gauge should read rich while at hard throttle. Does it read stoich while cruising and at idle(cause that's the way it should be)?

peace
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Old 09-15-2005, 03:38 PM   #8
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a/f guage as in narrow band ??
or a/f as in wide band

a narrow band will be pegged rich on even the most extreame tunes under throttle
a narrow won't read below 13.2
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Old 09-16-2005, 03:55 PM   #9
REXRED04
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narrow band... at 6000ft elevation and catless... and even when cruising it is reading in the rich but when under heavy load the needle is completely buried in the rich. i noticed that a few of my other cars that I had here in CO ran extremely rich also... cant wait to go back to a normal elevation..... thanks for the data also Jaxx
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Old 09-16-2005, 04:39 PM   #10
WolfPlayer
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I am at Sea Level and mine ran in the high 9's to low 10's AFR at WOT. COBB designs their maps for across the world. If they don't run them rich then motors will blow up. However, even with that said, they are still running leaner than stock. I leaned mine out to 11:1 AFR using StreetTUNER and Oh what a difference. The fuel level in my oil (Blackstone Analysis) went down too.

t
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Old 09-17-2005, 10:44 AM   #11
REXRED04
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So how reliable is the narrow band a/f guage i am running going to be? Is it going to give me relative safe readings or just a waste of money? I was under the impression that without the cats it would read somewhat faster and more accurate than with them in. I figured the altitude would play a large part in this.. how much better gas milage did you get when you leaned it out some? I get relatively good milage right now around 22-23mpg. I am thinking about contacting the place here in colorado that has the pro tuner and gettin some dyno time before I go back to Iraq again... but I just might get a larger turbo setup when I return so I might just wait....
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Old 09-17-2005, 11:00 AM   #12
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The gauge is useless. The gauge should read stoich while at part throttle, but many wrx's and sti's run a little richer then stoich sometimes(which would make the needle go a bit rich). Part throttle is the only time the gauge will tell ya anything useful, unless you're running so lean at hard throttle that your engine would probably blow pretty quickly if ya saw anything but rich on the gauge. Seems like your car's running normally. I don't think he ment there's a big difference in mileage by leaning out hard throttle fueling(even though there might be). I think he ment powerwise and the fuel in the oil thing, course I could be wrong.

peace
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