sd101
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sd101 [2009/06/14 14:15] dmertz |
sd101 [2009/06/15 10:09] dmertz |
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| When you connect these sensors to your ECU, note that you must connect the GM IAT sensor to the IAT input on the ECU. There is no other supported IAT input. For the pressure sensor, you can log that on any available (and compatible) input on the ECU. | When you connect these sensors to your ECU, note that you must connect the GM IAT sensor to the IAT input on the ECU. There is no other supported IAT input. For the pressure sensor, you can log that on any available (and compatible) input on the ECU. | ||
| - | Accuracy is important, particularly for the pressure readings. The MAP sensor should be connected as intimately as practical to the intake manifold. Long, narrow hoses and tee fittings in the path to the sensor slow the response of the pressure sensor, resulting in poor airflow determination. The delayed pressure response will result in poor throttle response and poor control over air/fuel ratio whenever the intake manifold pressure changes. Since both sensors are referenced to the ECU's sensor ground circuit, it's also important that the ECU's sensor ground circuit isn't disrupted by having high-current devices attached to sensor ground. | + | Accuracy is important, particularly for the pressure readings. [[sdhose|The MAP sensor should be connected as intimately as practical to the intake manifold.]] Long, narrow hoses and tee fittings in the path to the sensor slow the response of the pressure sensor, resulting in poor airflow determination. The delayed pressure response will result in poor throttle response and poor control over air/fuel ratio whenever the intake manifold pressure changes. Since both sensors are referenced to the ECU's sensor ground circuit, it's also important that the ECU's sensor ground circuit isn't disrupted by having high-current devices attached to sensor ground. |
| As normally installed, MAF translators do get their ground from ECU sensor ground via the Mitsubishi MAF connector and do draw a moderate amount of current, particularly when powering the GM MAF sensor at higher airflow, so expect the pressure and temperature readings to change a little when you unplug the MAF translator. 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. | As normally installed, MAF translators do get their ground from ECU sensor ground via the Mitsubishi MAF connector and do draw a moderate amount of current, particularly when powering the GM MAF sensor at higher airflow, so expect the pressure and temperature readings to change a little when you unplug the MAF translator. 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. | ||
sd101.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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