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Old 11-27-2009, 03:22 AM   #1
qwkwrx
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psm

Default cold weather and speed density

ever since it has been getting colder here, i've noticed under normal driving conditions (vacuum-0psi) that my air/fuel will peg 10.0-11.0 on the afr gauge. then, wot it will go to i think 11.5 to 11.9. i was wondering if i should maybe adjust intake temp fuel correction in the temperature compensation parameters in the 0 degree c. cat. i know it says which ever temp its closer to it will pull from that. 0c=32f and 30c=86f i would probably only have to adjust the 0c.
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Old 11-28-2009, 06:21 PM   #2
SurfWagon
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What are you OLF parameters(when UTEC takes control)? That can make a difference. It would certainly sound like temp correction could help, but what afrs were you seeing before the cold settled in?

I know that positive numbers (+5) retard timing. However I'm not sure what positive numbers in the fueling compensation bins do. Can anyone answer this? I understand that generally you want more fuel added during colder conditions, so at least your not on the lean side of things!
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Old 11-30-2009, 06:44 PM   #3
qwkwrx
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i'm pretty sure the only corrections that were changed are for higher temps (80c) that pull timing and add fuel
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Old 12-01-2009, 10:31 AM   #4
qwkwrx
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but wouldn't temp corrections happen all the way across the fuel board? my wot afr's are good just below boost is the issue.
does the 0% fuel column need to be adjusted? thats for before crossover am i correct?
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Old 01-23-2010, 12:26 AM   #5
SurfWagon
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What you do is change the coolant temp corrections. That way when you first start the car and the coolant is cold, it adds more fuel. Hopefully you don't go WOT on a cold engine. Then when you are warmed up you still have the propper fuel for WOT.

Positive numbers seem to add fuel in temp correction.
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Old 01-23-2010, 12:08 PM   #6
john 1badSTI
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on e85@ 30psi--spinning

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If it is like a true speed density setup there should be an IAT compensation map so when the outside/intake air gets colder the fueling can be compensated.It sounds like you just need to go and make some adjustments in this table but still you need to see what else is adding fuel while cruising because something is not right there.You may need to raise the crossover point from the ecu/utec up a little bit so the stock ecu still controls your cruise (low load) fueling since it has better tables to control temp compensation.
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