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Go Back   TDIClub Forums > VW TDI Discussion Areas > Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc)

Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc) Discussions about alternative fuels for use in our TDI's. This includes biodiesel WVO (Waste Vegetable Oil), SVO (Straight Vegetable Oil), BTL (Biomass to Liquid), GTL (Gas to Liquids) etc. Please note the Fuel Disclaimer.

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Old November 24th, 2018, 13:59   #16
soma56
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Quote:
Originally Posted by Vince Waldon View Post
True, although the switch does provide a easy way to go between "stock" and "a value I have determined that works".

EXACTLY.



Quote:
Originally Posted by Vince Waldon View Post
Another thing that occurs to me is the entire thing assumes the OEM fuel temperature sensor decreases its resistance as temperature goes up... if this is not the case adding resistance in series will trick the ECU in the wrong direction.

Presumably those that recommend a 2K additional resistor have confirmed this... but ya never know on the interwebs?!

That's a good point that I never considered. I suppose if one was inclined they could remove the sensor, add heat to it and see what the wire does in response to heat and/or cold although, given the number of positive responses in addition to those that have plugged in their VAG systems I'm confident they have it right.
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Old November 24th, 2018, 14:31   #17
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Quote:
Originally Posted by Vince Waldon View Post
Another thing that occurs to me is the entire thing assumes the OEM fuel temperature sensor decreases its resistance as temperature goes up... if this is not the case adding resistance in series will trick the ECU in the wrong direction.
Indeed, thermistors used in temperature sensing applications are usually of the NTC (negative temperature coefficient) type, i.e. resistance decreases as temperature rises. A PTC thermistor in a sensing application would be unusual.
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Old December 4th, 2018, 21:21   #18
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The hotter the ECU thinks the fuel temperature is, the more it retards the timing. The fuel temp sensor has always been the primary foe of the folks running WVO. There is one logic when setting up a WVO engine is to use larger sized nozzles and set the pump up advanced compared to stock at any given RPM. I used to ask some of the tuners I spoke with, "Why don't you code the ECU to not pull the timing back when the fuel heats up?" I never really got what I thought was a solid answer; I will say that was over ten years ago, so maybe I have forgotten.
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Old July 5th, 2019, 06:14   #19
soma56
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A quick update for anyone interested. I'm about 90% complete and should have it ready for a test this weekend. Here's a couple of photos working on the electrical and fuel tank I created. The display features temp gauges, an EGT gauge and a variety led indicators for various things that are powered on. The fuel tank (yes that is a little light that I installed in the tank - it makes things easier when swapping filters) was made from a mobile home water tank with a 5 gallon pail gamma seal 'affixed' to the top to allow for easy access. I have the potentiometer setup as originally discussed in this thread, however, having issues locating the correct fuel temp sensor wire to connect into (http://forums.tdiclub.com/showthread...80#post5519880).




Last edited by soma56; July 5th, 2019 at 06:31.
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Old July 6th, 2019, 10:29   #20
philngrayce
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Very interesting. You’re thinking outside the box, especially with that tank. Please keep us posted on your progress.
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Old July 7th, 2019, 11:57   #21
soma56
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The custom panel I made was installed today. I'll explain what all these leds and switches do later. Take note (as per an earlier discussion in this thread) - the potentiometer in the switch panel at the bottom left. The two indicators at the top right at temp sensors. One is immediately before the fuel goes into the injector and the second is located inside the veg fuel tank.



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