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8479 messages, Last post on Nov 28, 2009 at 12:53 AM
You are in the Automotive News & Views Forum. Your Hosts are steve_ & claires
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Replying to: nippononly (Sep 25, 2008 7:07 am) I'm still on the side that a fuel injection system cuts the fuel off while coasting in gear and I'd like to hear the Cobalt engineers expound on this. Someone please ring them up. 
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Replying to: steve_ (Sep 25, 2008 7:24 am) One other thing to consider though, even if the fuel shuts off completely when you coast in gear, the car will still coast further in neutral than in drive. So in some situations, putting in neutral might still be best.
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Replying to: andre1969 (Sep 25, 2008 7:28 am) When you pop it into neutral, you have to burn fuel to keep the motor running. Plus you have the safety issues of coasting in neutral (and it's illegal most places) and the engine won't run the water pump as fast coasting in neutral so your engine won't run as cool. If you have a carb instead of fuel injection, then the story is different. Or so I've read around here.
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Replying to: steve_ (Sep 25, 2008 7:33 am) I know that if I shut off the engine while decelerating in gear, I won't get the smooth decel I get now leaving the engine running. It will lurch and jump as it rapidly comes to a stop. Or at least, I THINK I know that! 
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Replying to: nippononly (Sep 25, 2008 8:24 am) ) they shut off the ICE at stop lights. Don't they shut down the ICE in town if you slow down to 30 mph or whatever and let the electric take over? I guess your method would work if you can juggle the ignition switch and the gearshift - and if you never need to accelerate away from a hazard quickly.
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Replying to: steve_ (Sep 25, 2008 8:51 am) I think I'd like 5 minutes of chat time with those Cobalt engineers too...
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Replying to: nippononly (Sep 25, 2008 10:08 am) Maybe they'll show up at the Chat tonight (9 ET, 6PT). 
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I think that my 2002 Seville would shut down fuel flow when going downhill with my foot off the gas. Proof that the fuel flow was at least near zero is that I had climbed up to an observation point near Mt. St. Helens, and then started back down after a period of time. The engine coolant temperature gauge showed the engine at near operating temperature before starting a long downhill grade. I put the car into second gear and coasted for some distance. The engine cooled off to the point that the temperature gauge showed the engine was getting cold. So one has to assume that there was no fire keeping it warm. I think that the primary fuel savings is from a different axle ratio for th Cobalt. |
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Replying to: steve_ (Sep 25, 2008 11:04 am)
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General Motors Corp. has reached agreement with U.S. regulators at a staff level that could result in the Chevrolet Volt range-extended electric vehicle receiving a 100-mile-per-gallon fuel economy rating, the company said. GM spokesman Dee Allen said the rating is far from set, stressing that what has been agreed to on a preliminary basis is that the Volt would be classified as an electric vehicle for the purpose of fuel-economy ratings. If that is made certain, he said, then the Volt, due out in November 2010, would likely receive a rating of 100 miles per gallon or better. So far this doesn't sit well with the EPA which considers the Volt a hybrid and expects it to complete the test cycle with a charged battery. GM and the feds have been going back and forth on this for months. Reports out this morning on Bloomberg and the Detroit Free Press indicated that GM and the EPA had reached an agreement that would potentially see the Volt as the first car classified with a 100 mpg rating are erroneous. We called spokesman Rob Peterson to get the scoop, and it turns out that GM has reached an agreement with the California Air Resources Board, (CARB) on a unique classification for the Volt. Peterson told ABG that this classification would reflect the Volt's true capability, essentially treating it as an EV. According to Peterson, "the classification helps us to optimize the Volt for what it does do, instead of being put into the category with a normal hybrid." This will potentially allow GM to run the Volt with the planned charge sustaining mode rather than having to run the engine to fully recharge the battery at the end of the test. The agreement with CARB gives GM a bargaining chip in its talks with the EPA, but Peterson cautions that the automaker and the federal agency "still have a long way to go" to finalize any agreement. The Volt may yet get that magic 100 mpg rating, but it's not there yet.
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