Wish there was a logical reason why GM didn't give us the option to disable engine running due to temperature
If we so choose. Seems rather silly to me to waste gas producing additional heat I don't need when I have plenty
electric range for my commute plus electric heat.
Yes, I too am unclear on why they setup the car to auto-run the ICE when the temp goes below 35°F/26°F/15°F. What's the benefit to me or the car?
Perhaps it's a convenience idea that went too far ("they will like the extra cabin heat when it's x°F outside"), or not far enough ("nah, few will want a switch to turn it off").
Did you buy the hacked ambient air sensor with switch from Joel on ebay? By the way, hacking the sensor with a resistor to prevent or limit ERDTT was the idea of Frank J Weber, the leader of the team that transformed the Chevrolet Volt from a concept to a production vehicle. Weber was the global chief engineer for electric vehicles at General Motors during his time in the U.S.
Yes I did buy the switch from Joe. He's a member here as well. I have that French site bookmarked and have read through it a number of times.
Nice thing about having the resister in parallel is it just offsets the temperature, so after a while I was able to guess pretty closely what the actual temperature was. I wanted to find an actual chart of the GM OAT sensor, but never found one with actual values. If anyone has it, I would love to create a complete table with original and offset values for next winter.
Is yours using the original or the newer 47k Ohm version, ari-c? At what (actual) temp did ERDTT turn on for you?
For those interested, Joel has a new improved switch here: http://www.ebay.ca/itm/Sonde-tempera.../281246258931?
You're never going to get GM to comment on a hack. The location of the air temperature sensor that controls ERDTT, how it operates and the theory that adding a resistor could cause the car to see a higher temperature was originally posted on GM-Volt by our own WOT and Tboult. Subsequently others, including Frank Weber (Volt chief engineer, now BMW i3), used this information to create a mod that prevented ERDTT. See our ERDTT mod FAQ for more details: http://gm-volt.com/forum/showthread.php?105569-Chevy-Volt-Accessories-and-Modifications-FAQ-s
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