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07-30-2005, 11:22 PM
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j/w
does cold air effect fuel trims?
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98 turbo zx2-sold 04 M3 supercharged 95 LS-Vtec hatch -built 
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07-31-2005, 10:11 AM
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it might.. depends if your car has an intake temp sensor.. density matters
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07-31-2005, 01:31 PM
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in short, yes.
brew is correct. colder air = denser air. therefore there will be more air per unit volume as opposed to air at a warmer temperature. In turn, the air/fuel ratio will be higher. How much higher depends on the temperature. For instance, you may experience knock on a car at 15psi on a 30 degree day, which you wouldn't see on a 70 degree day.
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I've been there, I've done that, I'm jaded. Now you get to hear about it.
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08-01-2005, 08:23 AM
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Re: j/w
Quote:
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08-01-2005, 01:18 PM
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None if you have a good ECU.
I need to retune every 20F change. Your fuel trims should adjust to keep stoich though. WOT is where I worry.
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This is Mike's dad and I've heard just about enough complaining from you guys. Autofest was cancelled because of lack of support from all of you, plain and simple. Blame yourselves. Here it is one month before the show and not one of you cheap bastards has pre- registered...
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08-01-2005, 01:25 PM
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Quote:
how is "none if you have a good ECU" an answer to his question at all?
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08-01-2005, 06:02 PM
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Quote:
 A GOOD ECU that takes into consideration changing environments such as a change to BARO would adjust fuel trims accordingly. For OBDI, it's 0-100% (I believe) and OBDII, it's STFT (Short Term Fuel Trim) and LTFT (Long Term Fuel Trim) which is I *THINK* a 0-1 or some other type of scaling. I never understood how people couldn't tune low throttle, it's dirt simple. Load transitions and WOT is much different  Anyhow, it shouldn't matter much in CLOSED loop as the ECU will keep you as close to stoich as possible. I only worry about WOT where the ECU is less-forgiving. My MAF-T takes the baro as a constant and it f0ks me in the winter.
__________________
This is Mike's dad and I've heard just about enough complaining from you guys. Autofest was cancelled because of lack of support from all of you, plain and simple. Blame yourselves. Here it is one month before the show and not one of you cheap bastards has pre- registered...
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08-01-2005, 06:12 PM
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yeah definitely. I thought you mean a good ECU would not take into account air temp lol
yeah tuning for good load cell transition is tough sometimes.
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08-01-2005, 06:21 PM
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im having trouble tuning my MAF-T any suggestions and also i knock at high rpm in 3rd and 4th gear but only about 15 to 20 counts
__________________
98 turbo zx2-sold 04 M3 supercharged 95 LS-Vtec hatch -built
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08-01-2005, 06:49 PM
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Quote:
 I think 1 count of knock is bad. :!:
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