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oppa637
Joined: 05 Dec 2011
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 Posted: Thu Sep 26, 2013 4:47 pm Post subject: |
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| atwood wrote: |
| 12ax7 wrote: |
| oppa637 wrote: |
| This does not save gas at all. You can't just make up energy. It takes more energy to regain speed then it does to maintain a speed. |
It will save gas. I just didn't explain it properly. I hadn't done it in a while, so I did today. At the most, the speed fluctuated by 2km/h. The key is not to look at the speed, but listen to the idle of the engine. Depending on the car and the road conditions, you can coast for 5-10 seconds on flat ground before you'll notice a drop in speed. |
Much of that Wiki article was dealing in hypotheticals. And the real savings is from coasting, which a bus can't do.
The idea of running the engine in its most efficient torque range makes sense but seems difficult in practice. |
There are certain areas in the rpm range that are most efficient but to go WOT just so you can coast is not the most efficient way. If you coast, you slow down which will require a lot more fuel to push your car up to speed again. It takes more energy to speed up then to retain your speed.
Idealy though, the reason you lose most of your gas mileage is due to braking. |
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12ax7
Joined: 07 Nov 2009
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| Posted: Fri Sep 27, 2013 2:48 am Post subject: |
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| atwood wrote: |
| 12ax7 wrote: |
| oppa637 wrote: |
| This does not save gas at all. You can't just make up energy. It takes more energy to regain speed then it does to maintain a speed. |
It will save gas. I just didn't explain it properly. I hadn't done it in a while, so I did today. At the most, the speed fluctuated by 2km/h. The key is not to look at the speed, but listen to the idle of the engine. Depending on the car and the road conditions, you can coast for 5-10 seconds on flat ground before you'll notice a drop in speed. |
Much of that Wiki article was dealing in hypotheticals. And the real savings is from coasting, which a bus can't do.
The idea of running the engine in its most efficient torque range makes sense but seems difficult in practice. |
What are you talking about? A bus can most certainly coast. Inexperienced drivers do it all the time, it's call 'riding the clutch'.
http://en.wikipedia.org/wiki/Clutch_control#Riding_the_clutch |
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12ax7
Joined: 07 Nov 2009
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| Posted: Fri Sep 27, 2013 2:51 am Post subject: |
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| Threequalseven wrote: |
| 12ax7 wrote: |
| atwood wrote: |
| 12ax7 wrote: |
| drydell wrote: |
Ah the constant gas pumping driver phenomenon.. Usually more experienced in cabs... One of the more daft behaviours some Kdrivers engage in..
Why do they do it?. no idea!.. Maybe a belief they save petrol.. But even if they do - really?.. Lurching forward and back all the time - nice way to consider your passangers... |
That's it, and it will save gas if done properly. Those who pump the accelerator non-stop just that aren't bright enough to understand how to do it properly, which is to smoothly accelerate for a couple of seconds, take your foot off the gas, let the car coast and then accelerate smoothly again when the car slows down to 5km/h-10km/h below the speed you want to go. |
Can you give some evidence that that actually works? Slowing down and then having to regain momentum to get back up to speed doesn't sound like a way to save gas. |
http://en.wikipedia.org/wiki/Energy-efficient_driving#Burn_and_coast |
It is ironic how one of the main sources for this article, who says it's theoretically possible to double or even triple one's fuel economy by driving this way, happens to be KOREAN! |
Doesn't matter. My original source was a British TV show I saw a good 5 years ago. In that particular episode, the host taught a guy who owned a heavily modified car, which he used for drag racing on weekends, to drive in order to save gas because it was costing him too much to commute to and from work. |
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atwood
Joined: 26 Dec 2009
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| Posted: Fri Sep 27, 2013 5:05 pm Post subject: |
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| 12ax7 wrote: |
| atwood wrote: |
| 12ax7 wrote: |
| oppa637 wrote: |
| This does not save gas at all. You can't just make up energy. It takes more energy to regain speed then it does to maintain a speed. |
It will save gas. I just didn't explain it properly. I hadn't done it in a while, so I did today. At the most, the speed fluctuated by 2km/h. The key is not to look at the speed, but listen to the idle of the engine. Depending on the car and the road conditions, you can coast for 5-10 seconds on flat ground before you'll notice a drop in speed. |
Much of that Wiki article was dealing in hypotheticals. And the real savings is from coasting, which a bus can't do.
The idea of running the engine in its most efficient torque range makes sense but seems difficult in practice. |
What are you talking about? A bus can most certainly coast. Inexperienced drivers do it all the time, it's call 'riding the clutch'.
http://en.wikipedia.org/wiki/Clutch_control#Riding_the_clutch |
One, riding the clutch is not coasting. Two, it's not good for the transmission. three, it doesn't save gas.
Besides the drivers in the article who were saving so much gas were coasting by turning off the engine, which makes your wiki point moot.
Do you know anything about driving and cars that isn't from wikipedia? |
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12ax7
Joined: 07 Nov 2009
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| Posted: Fri Sep 27, 2013 6:50 pm Post subject: |
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| atwood wrote: |
| 12ax7 wrote: |
| atwood wrote: |
| 12ax7 wrote: |
| oppa637 wrote: |
| This does not save gas at all. You can't just make up energy. It takes more energy to regain speed then it does to maintain a speed. |
It will save gas. I just didn't explain it properly. I hadn't done it in a while, so I did today. At the most, the speed fluctuated by 2km/h. The key is not to look at the speed, but listen to the idle of the engine. Depending on the car and the road conditions, you can coast for 5-10 seconds on flat ground before you'll notice a drop in speed. |
Much of that Wiki article was dealing in hypotheticals. And the real savings is from coasting, which a bus can't do.
The idea of running the engine in its most efficient torque range makes sense but seems difficult in practice. |
What are you talking about? A bus can most certainly coast. Inexperienced drivers do it all the time, it's call 'riding the clutch'.
http://en.wikipedia.org/wiki/Clutch_control#Riding_the_clutch |
One, riding the clutch is not coasting. Two, it's not good for the transmission. three, it doesn't save gas.
Besides the drivers in the article who were saving so much gas were coasting by turning off the engine, which makes your wiki point moot.
Do you know anything about driving and cars that isn't from wikipedia? |
Missed the part where I mention inexperienced drivers do it? And, you don't know much about mechanics if you want to argue that riding the clutch maintains a strain on the engine.
Besides, I've driven vehicles that were much larger than a bus. They could most certainly coast. |
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atwood
Joined: 26 Dec 2009
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| Posted: Sat Sep 28, 2013 5:25 am Post subject: |
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| 12ax7 wrote: |
| atwood wrote: |
| 12ax7 wrote: |
| atwood wrote: |
| 12ax7 wrote: |
| oppa637 wrote: |
| This does not save gas at all. You can't just make up energy. It takes more energy to regain speed then it does to maintain a speed. |
It will save gas. I just didn't explain it properly. I hadn't done it in a while, so I did today. At the most, the speed fluctuated by 2km/h. The key is not to look at the speed, but listen to the idle of the engine. Depending on the car and the road conditions, you can coast for 5-10 seconds on flat ground before you'll notice a drop in speed. |
Much of that Wiki article was dealing in hypotheticals. And the real savings is from coasting, which a bus can't do.
The idea of running the engine in its most efficient torque range makes sense but seems difficult in practice. |
What are you talking about? A bus can most certainly coast. Inexperienced drivers do it all the time, it's call 'riding the clutch'.
http://en.wikipedia.org/wiki/Clutch_control#Riding_the_clutch |
One, riding the clutch is not coasting. Two, it's not good for the transmission. three, it doesn't save gas.
Besides the drivers in the article who were saving so much gas were coasting by turning off the engine, which makes your wiki point moot.
Do you know anything about driving and cars that isn't from wikipedia? |
Missed the part where I mention inexperienced drivers do it? And, you don't know much about mechanics if you want to argue that riding the clutch maintains a strain on the engine.
Besides, I've driven vehicles that were much larger than a bus. They could most certainly coast. |
The article you linked to said it put premature wear on the clutch, which is part of the transmission. Which is is what I posted, not "strain on the engine," as you posted.
Sure, a bus could coast but it doesn't make any sense in such a heavy vehicle because it would expend too much energy trying to get back up to speed. It also would be more difficult to control.
You didn't answer my points. That you've driven a large vehicle doesn't mean you understand much about cars and driving. |
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Savant
Joined: 25 May 2007
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| Posted: Sat Sep 28, 2013 6:19 am Post subject: |
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There should be little need to coast a car or a bus, as it removes drive from the engine. For a bus, full of people, it is particularly dangerous and any driver who coasts in a bus full of people should be fired immediately.
Riding the clutch is acceptable, at times, in slow-moving traffic or to hold the vehicle on an incline. If the vehicle is kept stationary for a long period then use the handbrake and not ride the clutch.
To ride the clutch for extensive periods of time? I love the smell of a burning clutch in the morning. |
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Weigookin74
Joined: 26 Oct 2009
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| Posted: Sun Sep 29, 2013 7:54 pm Post subject: |
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| Steelrails wrote: |
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| Oh yeah, what's with these idiots who tute their horns at you repeatedly when your at a red light and in the far right lane. The arrow on the road indicates go straight or turn right. It says both. So, I'm there to go straight. I'm not going to get behind a long long lane of single cars that takes forever to go when the light turns green. |
Because you can turn right on red. I'm not sure if your state back home had that, but mine did and anyone who was going straight but in the right lane was expected to pull up a little to let the cars behind turn right on red. People who didn't do this were considered rude and selfish.
In the future you should help improve the flow of traffic by avoiding the right lane and keeping it free for people to turn right.
Other than that, for driving I just put on really mellow music- Classical, opera, chill R&B, jazz, coffeehouse music, etc. and just drive like a grandmother. Leave 5 minutes earlier and cruise. I like the slow lane and 4 seconds of space between me and the car in front, and a smooth ride. |
I can turn right on red in Canada and if there are two lanes going straight, the cars will gather in those lanes. At some intersections, the city was smart enough to build an extra seperate right turn lane for a short distance. Other intersections don't have this. If you get behind a car going straight, wait it out and then turn. Why should 50 cars back into one lane and then end up missing the light by the time they get their slow @$$ in gear? It takes so long for the light to change. Ain't my fault there's bad road design? They should have built expressways though their cities to get from one end to other more quickly and avoid all this. |
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asylum seeker
Joined: 22 Jul 2007
Location: On your computer screen.
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| Posted: Thu Oct 03, 2013 10:04 am Post subject: |
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| I've been on one coming back from Chuncheon where the driver was talking on a cellphone (without hands-free set) for a good 10 minutes haha. |
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Steelrails
Joined: 12 Mar 2009
Location: Earth, Solar System
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| Posted: Thu Oct 03, 2013 7:49 pm Post subject: |
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| Weigookin74 wrote: |
Why should 50 cars back into one lane and then end up missing the light by the time they get their slow @$$ in gear? It takes so long for the light to change. |
In theory, with a turn on red, the more efficient method would be for drivers going straight to stay in the center lane and for drivers turning right to stay in the right lane, allowing them to turn right during a red light and thereby allowing more traffic flowing through. If there is open space when the light turns green, the drivers in the center lane can then change lanes to the right and proceed through the green light.
| Quote: |
| Ain't my fault there's bad road design? They should have built expressways though their cities to get from one end to other more quickly and avoid all this. |
Well part of this is that there just wasn't the demand for this earlier and then things exploded all of a sudden. Korea had relatively few cars owned by familys through the 1970s. By the time there was a big car culture, development had already made widening and redesigning roads an expensive proposition. It wasn't bad planning, but you are right in that the situation does need to change and road improvements should be made.
More subway lines and more "cities from scratch" which have space to design larger roads, with people moving out of Seoul, would help. Really, before they focus on the cities, they should get all the highways up to at least 4 lanes a side. |
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