sdveadjsdratio
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| The [[v3mafadjcombft|MAFComp Adjust (CombinedFT)]] page describes an excellent process for dialing in your mass airflow sensor. Please read through this page carefully and make sure your mass airflow setup is calibrated as well as you can get it before attempting to use the **SD VE Adjust (SDRatio)** function. | The [[v3mafadjcombft|MAFComp Adjust (CombinedFT)]] page describes an excellent process for dialing in your mass airflow sensor. Please read through this page carefully and make sure your mass airflow setup is calibrated as well as you can get it before attempting to use the **SD VE Adjust (SDRatio)** function. | ||
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| To use this tool, you need to capture some data from your ECU while you drive around on the mass airflow sensor, before switching the Base MAF setting to Speed Density. | To use this tool, you need to capture some data from your ECU while you drive around on the mass airflow sensor, before switching the Base MAF setting to Speed Density. | ||
| - | As normally installed, MAF translators get their ground from ECU sensor ground via the Mitsubishi MAF connector and draw a moderate amount of current, particularly when powering the GM MAF sensor at higher airflow, so the pressure and temperature readings seen by the ECU will change a little when you later unplug the MAF translator, upsetting the VE table calibration. Changing the translator's ground from ECU sensor ground to chassis ground instead will eliminate this effect. Cut the MAF translator's ground wire between the translator box and the Mitsubishi MAF connector and connect the end of this wire coming from the translator to chassis ground. Leave the wire end that remains on the translators Mitsubishi MAF connector isolated and insulated. | + | **NOTE:** As normally installed, first generation (not Gen 2 or MAFT Pro) MAF translators get their ground from ECU sensor ground via the Mitsubishi MAF connector and draw a moderate amount of current, particularly when powering the GM MAF sensor at higher airflow, so the pressure and temperature readings seen by the ECU will change a little if you later unplug the GM MAF or MAF translator, upsetting the VE table calibration. Changing the translator's ground from ECU sensor ground to chassis ground instead will eliminate this effect. Cut the MAF translator's ground wire between the translator box and the Mitsubishi MAF connector and connect the end of this wire coming from the translator to chassis ground. Leave the wire end that remains on the translators Mitsubishi MAF connector isolated and insulated. |
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| The downside, of course, is that if you disable the air temp sensor for speed density operation inside the ECU, then you need to make sure your air temperature reading while doing your calibration drive is fairly reasonable (say between 50-90F). A good working intercooler and some careful attention to your right foot will help immensely with this too. | The downside, of course, is that if you disable the air temp sensor for speed density operation inside the ECU, then you need to make sure your air temperature reading while doing your calibration drive is fairly reasonable (say between 50-90F). A good working intercooler and some careful attention to your right foot will help immensely with this too. | ||
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| To ensure that this isn't a problem, you have to use one of our newer GM MAF cables that provide a separate power wire for the GM MAF's grounding point or you need to [[gmmafcablemod|modify our older GM MAF cable]] (if that's what you have) to add this wire. | To ensure that this isn't a problem, you have to use one of our newer GM MAF cables that provide a separate power wire for the GM MAF's grounding point or you need to [[gmmafcablemod|modify our older GM MAF cable]] (if that's what you have) to add this wire. | ||
| - | If you're running a GM MAF Translator device, you need to do [[gmmafcablemod|a similar modification]] on their GM MAF connector as was detailed for our older cables. | + | If you're running a GM MAF Translator device, you need to do [[gmmafcablemod|a similar modification]] on their GM MAF connector as was detailed for our older cables. This modification involves simply cutting the ground wire on the GM MAF connector and running it to chassis ground instead. |
sdveadjsdratio.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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