sd101
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sd101 [2009/06/16 07:31] twdorris |
sd101 [2009/06/16 07:33] twdorris |
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| 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. | ||
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| ===== Volume ===== | ===== Volume ===== | ||
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| Volume = displacement * VE[rpm, pressure] | Volume = displacement * VE[rpm, pressure] | ||
| - | If the VE for an engine running speed density is larger than the true VE of that engine at any given point, then the resulting airflow calculation will be higher than it should be and the resulting A/F mixture will be richer than intended as well. So you can see that getting the VE table defined accurately is one of the more critical (and variable) pieces to smooth speed density operation. | + | If the VE table lookup for an engine running speed density is larger than the true VE of that engine at any given point, then the resulting airflow calculation will be higher than it should be and the resulting A/F mixture will be richer than intended as well (because the ECU will inject more fuel than is required because it's assuming there's more airflow going in than there really is). So you can see that getting the VE table defined accurately is one of the more critical (and variable) pieces to smooth speed density operation. |
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