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This GM / Siemens Fuel Composition Sensor(FCS) current: GM12570260 EOL sensor: 12570250
Hard to find connector available here: [HU Webshop Ethanol Sensor Connector] or: [US Webshop Ethanol Sensor Connector] And a how-to on setting up display in VemsTune is available: [VemsTune FlexFuel Setup Guide] Sensor reads in Hz. Basic sensor testing: * Freq stability check: ** Turn on power @ 9:30 am Freq. = 69.99 Hz ** Turn off power @ 10:30 am Freq. = 69.99 Hz ** Test room temperature was steady at 67 Deg. F. * Freq. vs input voltage changes: ** 5.5 VDC power supply, Freq. = 69.99 Hz raised up the power supply voltage in 1 volt steps to 16.0 VDC power supply, Freq. = 69.99 Hz Note, sensor stops operating below 5.5 VDC. 16 VDC was the upper end of testing. *Current draw at power supply voltages from 5.5 VDC to 16 VDC: ** 25.7 ma to 25.9 ma or .026 amps! .* Connections on sensor: ** Black is GROUND (Ohm to chassis to prove). ** Pink is 12VDC. (car battery) ** White is the output signal. (A pull up resistor is needed here because the output is an open collector transistor inside the sensor so any voltage interface will work) ||Hz||gasoline|| Ethanol||Wheel Speed Reading km/h|| ||50||100||0||8|| ||55||95||5||9|| ||60 - E10||90||10||11|| ||65||85||15||12|| ||70||80||20||13|| ||75||75||25||14|| ||80||70||30||15|| ||85||65||35||16|| ||90||60||40||17|| ||95||55||45||18|| ||100||50||50||19|| ||105||45||55||20|| ||110||40||60||21|| ||115||35||65||22|| ||120||30||70||23|| ||125||25||75||24|| ||130||20||80||25|| ||135 - E85||15||85||26|| ||140||10||90||27|| ||145 - E95||05||95||28|| ||150||00||100||29|| * 50hz is 0.5v, 150hz is 4.5v 0-100% ethanol * and the pulsewidth of the input is the temperature of the fuel. * temp formula is ?C = (41.25 * pulsewidth_in_ms) - 81.25 |
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See GenBoard/VerThree/FlexFuel/HardWare for hardware specific info
Summary: Using the GM/Continental sensor directly is possible using a digital input (wheelspeed1, wheelspeed2, or from a digital on 2nd serial with appropriate adapter if desired) wheelspeed2 most typically Sensor outputs 50Hz at 0% Ethanol, 150Hz at 100% ethanol VemsTune Setup: Note: It is recommended to use 1.2.38 firmware. Several more anytrims were added in 1.3.32 which helps here. To set up adjustments based on ethanol content (example): Motorsports -> Anytrim Control Anytrim 1 = Fuel Trim, Speed2 Input Anytrim curve: Set the fuel adjustment curve. Roughly 0-30% from 50kph (0% Ethanol) to 150kph (100% Ethanol) Use additional anytrims if you want to adjust boost target, etc. |
| 170Hz is error output (self diagnostics built into sensor) |
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[external link for sensor] (config settings not relevant) |
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* Speed sensor divider : 10
* Speed Sensor Calibration : 10 |
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* Speed sensor divider : 1
* Speed Sensor Calibration : 100 (if VemsTune is in kph), 62 if VT is in mph |
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It is common to add a new symbol in VemsTune. You can edit the firmware version's calc-model-common .ini file in C:\Program Files (x86)\VemsTune-2018-01-04\config\include ex. calc-model-common-1.2.38.ini or if there isn't a calc-model-common for your firmware, edit C:\Program Files (x86)\VemsTune-2018-01-04\config\vemsTune-v3-<firmware>.ini Add a stanza that is "ethanol = speed2-50" if you use wheelspeed2 for your ethanol sensor Save and close the ini file. Start (or restart) VemsTune, and go to View -> Editors -> Add new symbol descriptor Choose "All" for a filter, and look for ethanol or whatever you named it. Choose a symbol group that makes sense. We use Fuel/Enrichments in our setups. Set a title that you like Ethanol or Flex-Fuel is sensible. Click Create. Then you can add or modify a gauge to display ethanol content. Right click an unused or un-needed gauge, "Change Gauge Data", Fuel/Enrichments, Ethanol Hopefully we can soon get this integrated into VemsTune and re-released so it's built-in (as below) |