Quote:
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Originally Posted by screaminfast
Quote:
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Originally Posted by Shawn96VR-4
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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how is "none if you have a good ECU" an answer to his question at all? |
I replied quickly.
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.