Quote:
Originally Posted by COcyclist
The ScanGuage II is pretty accurate on my TDI although if I mash the pedal to the floor, it wil go to 9999 for a few seconds and I know that's not right! Arragonis, are you considering E(off) coasting out of curiosity or in the name of science? Our diesels are so much more efficient at idle than a gasser (petrol) that I haven't felt that it was worth it. Depending on my coasting speed (engine on, in neutral) my ScanGuage reads 300-450 miles per gallon Or more! and that's not too bad. I was worried about shutting off the oil supply to a hot turbo, wear and tear from bump starting so often, and on my car, disabled airbags while the key is off. I am sure it can be done safely under the right conditions. I will be following your progress.
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Originally it was just an idea but I'm taking it more seriously. I've been watching the GPH at idle which registers 0.16 after calibration. How does that compare with yours ?
I have done a few days of experimenting with Off coasting for a small section of my daily grind and apart from having cold toes the other difference was that the average mpg at the end of the queue was 40 instead of a more usual 30-33, and at the end of the journey overall the average was nearer the magic 60 target instead of a more normal 45-50.
This is at the start so everything is cold including the turbo which hasn't been mashed yet. I let it idle for a bit to get fresh oil in there before shutting off anyway.
So I wondering about using it a little more but it takes so long to go through a tank at the moment I was hoping the SG2 would give me some more feedback.
The above figures are from the on-board computer which seems to continue to calculate the average when moving and engine off but the SG2 goes to sleep and 'freezes' where it was. I use the SG2 to have an average and instant MPG figure as well as temps - e.g. my on board temp gauge only starts at 50 Deg C.
If I go 'Hybrid' I understand the SG2 keeps going when the engine stops, but I suspect my calibration may be broken.