Guest |361| Posted May 31, 2009 Report Share Posted May 31, 2009 Is it possible to get a fuel composition sensor (from GM) working on a V88 ? I want to make use of the ethanol fuels but want to be sure the v88 knows what mixture the engine is running.So it automatically retard timing,add fuel and rise the turbo pressure. Quote Link to comment Share on other sites More sharing options...
rayhall Posted May 31, 2009 Report Share Posted May 31, 2009 I believe these sensors output a 0 to 5 volt signal. This could be used as the axis of a fuel and ignition table. Ray. Quote Link to comment Share on other sites More sharing options...
Guest |361| Posted May 31, 2009 Report Share Posted May 31, 2009 I copied the text below from the megasquirt forum. The fuel sensor uses a microprocessor to measure the ethanol percentage and fuel temperature, which it uses to produce and output signal. The fuel sensor signal is a square-wave voltage signal. The signal varies in both frequency and pulse width: The frequency of the signal indicates the ethanol percentage. The output frequency is linear with respect to the percentage of ethanol content in the fuel. The PCM provides an internal pull-up to five volts on the signal circuit, and the fuel sensor pulls the 5 volts to ground in pulses. The normal range of operating frequency is between 50 and 150 Hertz: 50 Hertz indicates 0% ethanol, and 150 Hertz indicates 100% ethanol. The pulse width indicates the fuel temperature. The normal pulse width is between 1 and 5 milliseconds: 1 millisecond indicates -40°C (-40°F), and 5 milliseconds indicates 125°C (257°F). Quote Link to comment Share on other sites More sharing options...
rayhall Posted June 1, 2009 Report Share Posted June 1, 2009 I could make an interface box that converts the frequency in to a 0 to 5 volt signal and the temperature into another 0 to 5 volt signal, so the Vipec ECU can use them. I will start thinking about the design. Ray. Quote Link to comment Share on other sites More sharing options...
Guest Hic Posted June 1, 2009 Report Share Posted June 1, 2009 Ray there is enough information here: http://www.zeitronix.com/Products/ECA/ECA.htm But getting the sensor itself could be the problem. Can you see if you can get it? The number is on this webpage. Quote Link to comment Share on other sites More sharing options...
rayhall Posted June 1, 2009 Report Share Posted June 1, 2009 No point making one, as that will do what is needed. It has the two 0 to 5 volt outputs. Quote Link to comment Share on other sites More sharing options...
Guest |361| Posted June 1, 2009 Report Share Posted June 1, 2009 Thanks for the replies sofar Ray. So what you mean is that I have to use the zeitronix ECA to have the proper outputs? If you would make a converter box without a display ,will this be alot cheaper? As I don`t need a display because the V88 allready change the fuel mixture. I bought the sensor allready. I got it from gmpartsworldwide . Pretty expensive I must say... Quote Link to comment Share on other sites More sharing options...
rayhall Posted June 1, 2009 Report Share Posted June 1, 2009 So what you mean is that I have to use the zeitronix ECA to have the proper outputs? If you read the information on the zeitronix you will see it has two analog outputs that are 0 to 5 volts, based on the amount of ethanol and the temperature. Yes a converter without a display would be cheaper. I will look at making one. Ray. Quote Link to comment Share on other sites More sharing options...
rayhall Posted December 25, 2009 Report Share Posted December 25, 2009 I now have a working prototype of a interface for composition sensors with a 50-200 Hz = 0 to 100% ethanol and a temperature range of -40 to 150C. The interface has two 0 to 5 volt output signals and one digital. The two volt signals are ethanol % and fuel temperature. The digital output is an error signal if water or methanol is in the fuel tank. I have a question before I commit to make the production version. How important is it that the interface has a digital display, when you will be able to see the percentage and temperature in the software and data logs. Leaving out the display will make the price much cheaper. Ray. Quote Link to comment Share on other sites More sharing options...
Guest |361| Posted February 22, 2010 Report Share Posted February 22, 2010 Didn`t visit this board in a long time so sorry for the late reply.. I bought a ECA from zeitronix and got it working. Only thing to do is to tune the car on a dyno with different mixtures of ethanol. I hope I can do this in coming spring but just bought a house with a lot of work so my priorities changed. To answer your question Ray, the digital screen is not a necessary thing although it`s nice to know which blend I have in the tank. Put to be honest I rather save the extra money spend on the digital screen for other more important parts. I still have another project where I need a ECA so I`m interested in the price you can make them for. Quote Link to comment Share on other sites More sharing options...
rayhall Posted February 22, 2010 Report Share Posted February 22, 2010 The first production Vipec composition sensor interface are finished. They just need testing, then will be available. I am also trying to find a cheap source for the sensors, so I can offer them as a package, or just the interface alone. Ray. Quote Link to comment Share on other sites More sharing options...
Guest |320| Posted February 26, 2010 Report Share Posted February 26, 2010 Suscribed to this thread. Any idea when they will be ready for release? Quote Link to comment Share on other sites More sharing options...
rayhall Posted February 26, 2010 Report Share Posted February 26, 2010 If you just want the sensor interface, then they are ready to go as soon as I get someone to test one of them. If you want the sensor and the interface, then I am still looking for a cheaper supply for the sensors. Ray. Quote Link to comment Share on other sites More sharing options...
Guest |361| Posted April 26, 2010 Report Share Posted April 26, 2010 The sensors are extremly expensive at a GM dealer (were I got it...) You can get the sensor alot cheaper at zeitronix site ($359... I paid almost twice that price). Quote Link to comment Share on other sites More sharing options...
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