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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 12-19-2004, 05:12 PM   #11
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Your long term fuel trims should be as close to 128 as you can get them and the short term should be as close to that as you can get it. Advanced mode isn't that hard with the afc do you know how to change the setting from 1 to 13 kHz? After that it'* pretty easy.
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Old 12-19-2004, 05:15 PM   #12
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Im mainly concerned about tuning it wrong and messing something up
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Old 12-19-2004, 08:09 PM   #13
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i've seen my ST trims up to 160
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Old 12-19-2004, 08:47 PM   #14
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Do you know of any good arcticles on mafs and fuel curves that could go into depth a little more?
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Old 12-19-2004, 08:53 PM   #15
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Old 12-20-2004, 10:55 PM   #16
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How does the maf sensor measure the airflow going inot the motor? Does it just take that number and translate it into voltage and send it back to the ecm? The article in gm high tech performance was pretty useful, but i didnt get as much from the rest of them, so do you have anymore
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Old 12-20-2004, 11:14 PM   #17
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Aight lemme take a bash at this hehe...

It uses electricity to heat a thermistor to 212*F above air temp. Airflow cools the element and the PCM tracks how much 'effort' it takes to maintain that temperature. Thus you have a pretty accurate idea on the mass of the air. Ours are a Hitachi MAF sensor and it sends whats called a square-wave variable frequency to the PCM. This frequency ranges from 32-150hz. The PCM takes this number then factors in load, rpm, TPS, and IAT and applies the variable to a map to determine fuel delivery. The Bosch MAF sensors do the same thing, but they send a voltage between 0-5v to the PCM instead of a frequency...Make more sense?

On a side note, that is how the air/fuel calibrators work. They simply take the, say, 38hz signal and change it to 40hz for more fuel or 36hz for less. It also highlights the downside of it as you only change the MAF signal, not the other variables used in determining fuel delivery. It does the job though
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