No but it was very different driving wise between the two.......analouge made my clutch slip because the power came in ALL at once....digital is much smoother

Thats more evidence. Cheers:thumbup:

All the resistor mod does is keep the glow plug/fuel pre heater on, to heat up the fuel I believe before its injected!

Not correct I'm afraid John. The fuel is cooled rather than heated.

To quote from the VAG PD130 manual -

Fuel Temperature Sensor G81

The Fuel Temperature Sensor G81 is located in the fuel return line between the

fuel pump and the fuel cooler. It determines the current temperature of the fuel at that point. The Fuel Temperature Sensor G81 has a negative temperature coefficient. The sensor resistance decreases with increasing fuel temperature.

Signal application

The signal generated by the Fuel Temperature Sensor G81 is used by the Diesel Direct Fuel Injection Engine Control Module J248 to determine the fuel temperature. This signal is needed to calculate the start of injection point and the injection quantity so that allowance can be made for the density of the fuel at different temperatures. This signal is also used to determine the timing for switching on the fuel cooling pump.

Effects of signal failure

In the event of Fuel Temperature Sensor G81 signal failure, the Diesel Direct Fuel

Injection Engine Control Module J248 calculates a substitute value from the signal

generated by Engine Coolant Temperature Sensor G62.

You get what you pay for. If you spend

Not correct I'm afraid John. The fuel is cooled rather than heated.

The sensor resistance decreases with increasing fuel temperature.

So therefore, if you increase the resistance (by adding a resistor) you fool the ECU or whatever determines the injection timing/amount into thinking the fuel is actually warmer than it is? so more fuel will be added as a warm fuel mixture is less dense than cool fuel mixture? I think i've got that right, kinda makes sense now!!

So do you recommend one then Stu?

Sensor resistance decreases as fuel temperature increases. So by putting in some extra resistance you give the impression that the fuel is cooler than it really is.

Everyone is of the opinion that these harm your car but while I can't say for sure it won't I don't really see how it can as long as you are sensible. You are really just modifying the expected parameter. The problem with Check Engine Lights coming on is that too much resistance is used causing an out of tolerance parameter and setting the ECU to default to monitoring the coolant temp sensor instead.

I would advise the use of one with a variable resistor as per the pictures and diagram I posted.

Sensor resistance decreases as fuel temperature increases. So by putting in some extra resistance you give the impression that the fuel is cooler than it really is.

Sorry im lost now, I dont see how the fuel being warmer than the ECU believes it to be can aid performance? a cold mixture being more dense the ECU would put less fuel in than would be required if it was getting the correct warm fuel signal?

Had one on my vrs.Great increase in performance but car used more fuel and I got fed up of the increase in smoke,in the end I took it off!

Anyone tried a Remap AND a resistor mod?

Anyone tried a Remap AND a resistor mod?

BANG :rofl: