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03-09-2011, 01:25 PM | #23 | |
Mario
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Yep, I am in the IT business and re-starting hardware regularly is bad, big time. But how much difference does it actually make? Difficult to quantify I suppose because it depends on how long you are standing still for. However, I am convinced that S/S is not efficient if it switches off for a few seconds only. There is a lot of unused fuel going through an engine on startup. Bit like a neon light which needs to be switched of for something like an hour before it becomes more efficient than leaving on. Interesting subject, I wonder what the break even point for an engine is?
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03-09-2011, 03:08 PM | #24 |
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I don't think wear and tear is an issue with S/S systems - I'm sure manufacturers have compensated/ factored this in. And to date I have not read anywhere about failed starters that have these systems.
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03-09-2011, 03:29 PM | #25 |
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Hi Manicm, not sure I follow. I was referring to non-S/S cars being switched off. S/S cars are a different story, they are designed for it. I do still wonder though how effecient they really are if you switch off for a few seconds only, say in slow moving, unpredictable traffic.
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"Always in motion is the future" - Master Yoda "Truly wonderful, the mind of a child is" - Master Yoda "There is no passion to be found playing small - in settling for a life that is less than the one you are capable of living" - Nelson Mandela |
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03-10-2011, 03:04 AM | #26 | |
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Another story is the real economy you make with the system. In ideal conditions, when you wait at every traffic light 5 minutes, it sure makes sense. But I noted that in normal city traffic, most of the S/S cycles last no more than 10s, so restarting the engine 10 times to spare in total about 1 minute of its running at minimum rpm seems ridiculous. |
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03-10-2011, 03:54 AM | #27 | |
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I agree with Nathan. In the long run, whether S/S or non-S/S, laws of physics still applies. There is definitely stress induced to the system during the start-stop/power cycles.
Besides, in the real economy, the so called "designed for" is only valid within the warranty period. It's ugly, but it's the truth. I guess if you are the type of person that changes cars once the warranty is over, it doesn't really matter. But if you do intend to keep cars longer than that, then I would take all these into consideration. Quote:
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03-11-2011, 05:27 AM | #28 |
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I don´t remember if it is Honda or Nissan that has a much better S&S. You dont have to switch to neutral,press down the clutch and press down the brake. You just press the brake with first gear in and the clutch down and the engine stops, release the brake and the engine starts.
That is the way a good S&S should work. |
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03-11-2011, 07:39 AM | #29 | |
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No thanks, I have a lot of complaints about the bmw S/S system but still seems much more intuitive than the one you describe. Besides, stopping with the clutch instead of the neutral gear is a good way to make the car know you DON'T want it to stop the engine. All in all, as already said, the whole system seems to me hardly useful. |
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03-11-2011, 01:10 PM | #30 | |
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Having said that, I must admit that although not a "green" person, I pay attention to a car emission level, andnot only for tax-avoidance purposes...
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03-20-2011, 08:07 AM | #31 |
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Hi Guys
Good to see so many replies. It seems most of you don’t think it is a good idea to switch off the engine on an auto transmission. On the owner’s handbook, it states that “When you stop the car for longer period, for example, at traffic light, railway crossing or in traffic jams, switch of the engine. You save fuel event if the engine is off for no longer than approximately four seconds.” So the questions is, does the above statement apply to all X1 or only to manual transmission. Thanks |
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03-20-2011, 09:35 AM | #32 |
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Yeah well it all comes down to then that if it makes you happy/efficent to do it, then do it. If it says so in the manual... Call your BMW service and ask them?
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03-20-2011, 10:58 AM | #33 | |
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Same for traffic lights... You rarely stand still for more than one minute before it goes green again, so no, you would not cut the engine. Conversely a railway crossing, unless the train is already passing as you pull up, will hold you for a few minutes at best, in which case it does make sense to kill the engine. Rule of thumb is 2 minutes. Under, you let it idle, over, you turn it off. Common sense....
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