History of GenBoard/VerThree/FlexFuel
Older Newer
2023-08-30 13:17:35 . . . . 85-238-80-124.pool.digikabel.hu [flexfuel notes, formatting]
2021-10-11 01:20:32 . . . . 178-164-238-78.pool.digikabel.hu [table formatting]
2021-10-11 01:14:59 . . . . 178-164-238-78.pool.digikabel.hu [freq and pulsewidth formula]
2020-04-06 10:20:27 . . . . 178-164-238-83.pool.digikabel.hu [configlet and VT help (check/add/update)]
2020-03-25 09:18:35 . . . . i5C7426E8.versanet.de [Flex fuel speed sensor settings added]
2016-07-13 15:20:50 . . . . MembersPage/JasonRussell [Added links to connectors and setup guide]
2016-06-05 07:37:10 . . . . catv-80-99-49-48.catv.broadband.hu [flex fuel sensor notes]


Changes by last author:

Changed:
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

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.

Deleted:
170Hz is error output (self diagnostics built into sensor)
Deleted:
----

[external link for sensor] (config settings not relevant)

Changed:
* Speed sensor divider : 10

* Speed Sensor Calibration : 10

* Speed sensor divider : 1

* Speed Sensor Calibration : 100 (if VemsTune is in kph), 62 if VT is in mph

Added:

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)