sdveadjcomft
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sdveadjcomft [2009/12/28 12:42] twdorris |
sdveadjcomft [2024/03/15 11:16] (current) |
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| **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. | **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. | ||
| - | {{ http://www.ecmtuning.com/images/forums/sddata/sdmaploc.png}} | + | {{ https://www.ecmtuning.com/images/forums/sddata/sdmaploc.png}} |
| Add the following log items to your captured values (F10): CombinedFT, ClosedLoop and MAP sensor. | Add the following log items to your captured values (F10): CombinedFT, ClosedLoop and MAP sensor. | ||
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| The image below shows a fairly typical setup for the various open loop threshold tables you can use to extend closed loop mode for this test. Keep in mind what you're doing here, though. You're basically telling the ECU to maintain stoich air fuel ratios under more load (LoadFactor) and with more throttle. This could very well produce a hotter mixture than you'd like to maintain for any lengthy period of time. So monitor EGTs if possible or if not, just try not to stay under high load/closed loop mode for very long. | The image below shows a fairly typical setup for the various open loop threshold tables you can use to extend closed loop mode for this test. Keep in mind what you're doing here, though. You're basically telling the ECU to maintain stoich air fuel ratios under more load (LoadFactor) and with more throttle. This could very well produce a hotter mixture than you'd like to maintain for any lengthy period of time. So monitor EGTs if possible or if not, just try not to stay under high load/closed loop mode for very long. | ||
| - | {{ http://www.ecmtuning.com/images/forums/mafadjcombft/olthresholds.png }} | + | {{ https://www.ecmtuning.com/images/forums/mafadjcombft/olthresholds.png }} |
| With that table in place, you can grab a datalog with a bit more load variation. Personally, I like to find a nice hilly area and apply light throttle to vary LoadFactor between 0.9 to 1.3 while maintaining closed loop operation. This driving combined with the typical flat road driving (with LoadFactors around 0.6-0.9), combined with typical idle and free rev (LoadFactors around 0.3-0.4) really produces a good set of data for this function. | With that table in place, you can grab a datalog with a bit more load variation. Personally, I like to find a nice hilly area and apply light throttle to vary LoadFactor between 0.9 to 1.3 while maintaining closed loop operation. This driving combined with the typical flat road driving (with LoadFactors around 0.6-0.9), combined with typical idle and free rev (LoadFactors around 0.3-0.4) really produces a good set of data for this function. | ||
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sdveadjcomft.1262022163.txt.gz ยท Last modified: 2009/12/28 12:42 by twdorris
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