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ethanolsupport [2014/03/12 08:49]
twdorris [Operation]
ethanolsupport [2024/03/15 11:16] (current)
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-Our [[:​ethanolsensorparts|Ethanol sensor parts list page]] has links to the connector and pins needed to fit to this sensor. ​At some point, ​we may provide ​a simple modification to our SD cable that provides this connection for you. The adapter ​will look something ​like the one shown below (click to enlarge) and will simply ​snap into the MAF connector on the SD cable.+Our [[:​ethanolsensorparts|Ethanol sensor parts list page]] has links to the connector and pins needed to fit to this sensor. ​But we also [[https://​www.ecmtuning.com/​product_info.php?​cPath=26&​products_id=70|offer ​a simple modification to our SD cable ]]that provides this connection for you. The adapter ​looks like the one shown below (click to enlarge) and simply ​snaps into the MAF connector on the SD cable.
  
  
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-If you're not running our SD cable or if you're looking to do this before we have that SD cable adapter ready, then the easiest option is to simply get the [[http://​www.eficonnection.com/​eficonnection/ItemDetails.aspx?​ItemId=1222|EFI Connection Part # 100-00741 pigtail]] and just wire it straight up yourself.+If you're not running our SD cable, then the easiest option is to simply get the [[https://​www.eficonnection.com/​home/product/​ethanol-e85-sensor-connector-pigtail|EFI Connection Part # 100-00741 pigtail]] and just wire it straight up yourself.
  
  
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-The power connection (labeled "​Vcc"​) needs to run to a +12v source. You can find +12v either straight off the battery (of course) or there'​s ​a +12v wire on the MAF connector harness ​too. This will be a thick red wire on pin 3 of a 1G MAF connector or pin 4 of a 2G/EVO3 MAF connector.+The power connection (labeled "​Vcc"​) needs to run to a switched ​+12v source. You can find a convenient switched ​+12v source ​on the MAF connector harness. This will be a thick red wire on pin 3 of a 1G MAF connector or pin 4 of a 2G/EVO3 MAF connector.
  
  
 The signal wire (labeled "​Out"​) needs to run to the ECU's MAF input. This is pin 2 (green with blue stripe) on a 1G MAF connector or pin 3 (blue with yellow stripe) on a 2G/EVO3 MAF connector. The signal wire (labeled "​Out"​) needs to run to the ECU's MAF input. This is pin 2 (green with blue stripe) on a 1G MAF connector or pin 3 (blue with yellow stripe) on a 2G/EVO3 MAF connector.
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 ===== Operation ===== ===== Operation =====
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 ^Log parameter ^Description | ^Log parameter ^Description |
-|**FlexFreq** ​ |Displays the sampled ​freqeuncy ​from the ethanol sensor. |+|**FlexFreq** ​ |Displays the sampled ​frequency ​from the ethanol sensor. |
 |**FlexEthMix** ​ |Displays the ethanol content reported from the sensor as a percentage. A number like 85% indicates an 85% concentration of ethanol in the fuel. | |**FlexEthMix** ​ |Displays the ethanol content reported from the sensor as a percentage. A number like 85% indicates an 85% concentration of ethanol in the fuel. |
 |**FlexOctWeight** ​ |Displays the weighting given to the MaxOct tables based on ethanol content. A value of 100% means the MaxOct table is being used exclusively with no influence from the MinOct tables. A value of 50% means the MinOct and MaxOct tables are being averaged equally. | |**FlexOctWeight** ​ |Displays the weighting given to the MaxOct tables based on ethanol content. A value of 100% means the MaxOct table is being used exclusively with no influence from the MinOct tables. A value of 50% means the MinOct and MaxOct tables are being averaged equally. |
-|**FlexFuelAdj** ​ |Displays the amount of fuel adjusment ​to be applied based on ethanol content and the ECU's configuration. A value of 0% would mean that no ethanol-related enrichment is being applied. A value of 50% means a 50% ethanol-related enrichment will be applied in the final injector ​pulsewidth ​calculation. Typical values for FlexFuelAdj are somehwere ​from around 6% for E10 and maybe 55% for E85. But this all depends on other parameters described below. |+|**FlexFuelAdj** ​ |Displays the amount of fuel adjustment ​to be applied based on ethanol content and the ECU's configuration. A value of 0% would mean that no ethanol-related enrichment is being applied. A value of 50% means a 50% ethanol-related enrichment will be applied in the final injector ​pulse width calculation. Typical values for FlexFuelAdj are somewhere ​from around 6% for E10 and maybe 55% for E85. But this all depends on other parameters described below. |
  
 +
 +\\
  
 ==== Settings ==== ==== Settings ====
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-==== Calculating ​a new global fuel scale ====+==== Calculating global fuel scale ====
  
  
-One thing that was mentioned above in the "Fuel increase at E100" section but might not have been clear is that you need to specify your global fuel adjustment on the Fuel tab assuming a 0% ethanol content. ​ So before you first enable ethanol sensor compensation,​ you're going to need to adjust your current global scale value according to the ethanol content of the fuel currently installed in your tank to make it correspond to a 0% content value.+One thing that was mentioned above in the "Fuel increase at E100" section but might not have been clear is that you need to specify your global fuel adjustment on the Fuel tab assuming a 0% ethanol content. So before you first enable ethanol sensor compensation,​ you're going to need to adjust your current global scale value according to the ethanol content of the fuel currently installed in your tank to make it correspond to a 0% content value.
  
  
-To do that, you'll manually kick the fuel pump on using the button on the Misc tab, let the fuel circulate for a few seconds and then view the FlexFuelAdj log value to see how much of an adjustment ECMLink is going to make to your global fuel scale once enabled. ​ Then you're just going to "​undo"​ that adjustment on the global fuel scale so that once the adjustment is enabled, you'll end up right back where you started. ​ This ensures a consistent transition away from having no automatic ethanol adjustment. ​ An example ​or two will surely clear this up.+To do that, you'll manually kick the fuel pump on using the button on the Misc tab, let the fuel circulate for a few seconds and then view the FlexFuelAdj log value to see how much of an adjustment ECMLink is going to make to your global fuel scale once enabled. Then you're just going to "​undo"​ that adjustment on the global fuel scale so that once the adjustment is enabled, you'll end up right back where you started. This ensures a consistent transition away from having no automatic ethanol adjustment. An example will surely clear this up.
  
  
-\\+**Example:​** Current global fuel = -40.5% before installing the ethanol sensor. Once installed and the fuel pump is run for a few seconds, FlexFuelAdj reads +35.9%. 
 + 
 + 
 +**STEP 1: ** New global = (current global + 1) / (FlexFuelAdj + 1) - 1\\  
 +**STEP ****2: ** New global = (-0.405 + 1) / (0.359 + 1) - 1\\  
 +**STEP 3: ** New global = 0.595 / 1.359 - 1\\  
 +**STEP 4: ** New global = 0.438 - 1\\  
 +**STEP 5: ** New global = -0.562 or **-56.2%**  
 + 
 + 
 +So you would change the -40.5% global fuel to -56.2% before enabling the ethanol sensor adjustment in ECMLink.
  
ethanolsupport.1394628578.txt.gz · Last modified: 2014/03/12 08:49 (external edit)