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Flex Fuel
Posted: Sun Feb 06, 2011 2:15 pm
by scnicholl
MS2 V3.0
Bench testing flex fuel sensor w/stim
MegaTune Ethanol Percentage Gauge reads
13% w/E10
-48% w/E85
E85 Correction Gauge reads
108% w/E10
70% w/E85
Any suggestions?
Re: Flex Fuel
Posted: Mon Feb 14, 2011 11:54 am
by Matt Cramer
Please post a copy of your MSQ file.
Re: Flex Fuel
Posted: Mon Feb 14, 2011 4:13 pm
by scnicholl
Re: Flex Fuel
Posted: Tue Feb 15, 2011 5:13 am
by Matt Cramer
Nothing obviously wrong that I could see - do you have any way of checking the sensor?
Re: Flex Fuel
Posted: Tue Feb 15, 2011 6:58 am
by scnicholl
Do not know how to check
It's a new sensor
Re: Flex Fuel
Posted: Tue Feb 15, 2011 7:17 am
by Matt Cramer
Do you have an oscilloscope or a frequency meter?
Re: Flex Fuel
Posted: Tue Feb 15, 2011 3:55 pm
by scnicholl
No
Re: Flex Fuel
Posted: Wed Feb 16, 2011 5:22 am
by Matt Cramer
Sorry, I can't think of another way to tell what signal it's sending, and it wouldn't be easy to set up a simulated signal.
Re: Flex Fuel
Posted: Wed Feb 16, 2011 6:34 am
by Alexander_Monday
Just a couple of thoughts for a low tech way to get a rough idea of the sensor signal.
Take it for what you paid for it.
I would think that a high impedance earbud would let you listen in to the frequency component which is related to the ethanol content.
IIRC 50HZ is no ethanol and 150HZ is 100% ethanol.
There are freebe online audio oscillator's that use your PC & sound card so you could use one of them to get close to what frequency is present from the sensor with comparison by ear.
Another possible way would be to send the signal to a sound card imput and use some open source audio oscilloscope software.
But I would probably use a resistor bridge made up of a potentiometer in series and a resistor in parallel after it between the sensor and the sound card to make sure you do not overload it.
With this method you should also be able to look at the pulse width.