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long drive and temperature changes

 
Old 09-15-2009, 03:51 PM
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Default long drive and temperature changes

Heey there all,

So after much trial and error... I finally figured out what was causing my miss. Seems that I had a bad set of plugs despite being told by the previous owner that they had just been replaced. :( Come to find that they were old and worn out...just plain nasty actually.

Anyhow, so decided to make a 7 hour drive to the beach in North Carolina and noticed a few things!

So it was on my way from NC to MD when I was going home. Left NC in great 85 degrees and sunny... AFRs at 4k cruise in 6th were 14.9-15.3 all the time. Got closer to home and the temperature was dropping like mad! IATs were 68 degrees and I was now running AFRs in the 12-13 range at the same cell that earlier was perfect.

Anyhow, I dunno if anyone here has done the full range of temperature corrections for their air temperature; but was curious to see. We're just now seeing cool weather and would love to compare my numbers to someone elses. Esp since it seems to me that I should be taking fuel away in cold weather and not adding.

Any help and advice is always appreciated!

Thanks and cheers,
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Old 09-15-2009, 03:53 PM
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My afr's richen up pretty drastically when temps go down as well. Goes from 14.9 to like low to high 13's. Haven't worked on that yet.
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Old 09-15-2009, 04:34 PM
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there is only one possible solution to the air temp correction map. it looks like this:
Attached Thumbnails long drive and temperature changes-airtempcorrection.jpg  
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Old 09-15-2009, 04:41 PM
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that's exactly what mine is at
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Old 09-15-2009, 05:34 PM
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the theory behind it is based on the density of air at those temps. what's your coolant temp enrichment look like? you guys have logs of all temps and stuff?
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Old 09-15-2009, 06:22 PM
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I will have to run some logs tonight... could be the water temp since I have a big *** radiator in there too!

Gonna look tonight or tomorrow when the weather is cooler

Thanks and cheers,
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