| Air Adjuster - good or bad ? |
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Here are some Cons and Pros against the Air Adjuster:
Some say not to use this. It works by allowing you to shift the MAF output voltage by some fixed amount up or down. It is true that the EEC operates using feedback from the o2s in closed loop, but this does not necessarily mean you'll run stoichiometric (14.7:1). If your MAF does not read accurately or if your transfer function is not correct for your MAF, then your EEC, using the O2s, will try to correct for this using a correction factor of up to ~ +/- 25%. If the EEC, using adaptive controls, runs up to the 25% correction limit and is still unable to bring A/F back to stoic, you will run either rich or lean depending on which way you MAF is in error.
The air adjuster is supposed to allow you to shift the MAF output voltage so that you will run the right A/F. What the air adjuster does, however, is shift the entire MAF output curve. So what might work at one end might not work at the other. If you correct for an idle rich or lean, you might end up shifting your MAF output at high airflow with the result that you might run rich or lean at WOT.
Actually, you'll have now way of knowing what A/F you'll end up with. And if you used this to tune for the fastest track times at WOT, you will still end up shifting the curve everywhere and not necessarily have you want at points other than WOT. The only way to correctly tune A/F is to import an accurate MAF transfer function into the EEC and then use a wideband O2 to change the desired A/F ratios in the fuel load tables. You can also shift the MAF transfer function up or down at high flow rates to give you the A/F you want at WOT, but you should start with an accurate transfer function otherwise the EEC's load calculations will be off and other functions will be affected.
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