01-13-2013, 02:48 PM | #1 |
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Stop-start question
I have purchased a 2013 X3 2l diesel. Recently I counted the number of stop-starts while travelling through town - about 20 times over a distance of less than 10km, mainly due to poorly synchronised traffic lights. As I am concerned that this is excessive, could BMW please assure me (and other members) that the starter motor assembly has been designed for so many starts over such a short travel distance on a daily basis.
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01-13-2013, 04:34 PM | #2 |
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I can only give you my opinion: the Start/Stop feature is exactly for this type of usage. Gas mileage is lowest when stop/starting a great deal- the S/S feature assists the owner of the vehicle to counteract poor gas mileage.
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01-13-2013, 04:45 PM | #3 |
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I don't believe fuel consumption isn't scottrh's primary concern... longevity of the starter is.
How much fuel do you actually save and how much does a starter cost (supplied and installed)?
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01-13-2013, 04:49 PM | #4 | |
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01-13-2013, 04:52 PM | #5 |
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Others have quoted that the BMW manual states that the start/stop feature may put excessive wear on parts.
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01-13-2013, 10:08 PM | #6 |
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Thanks for your input scotta2. If BMW regards mechanical failure from excessive stop-starting as wear and tear not covered under warranty, then there should be a way of optionally setting the system default to off. Is this possible?
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01-13-2013, 10:20 PM | #7 |
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US BMW dealers are reported to be authorized by BMW to do a one-time change of the default setting from "On" to "Remember Last Setting". You will have to ask your BMW dealer in RSA if they are permitted to reprogram it for you.
See this thread for further information: http://x3.xbimmers.com/forums/showthread.php?t=730730 |
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01-14-2013, 01:42 AM | #8 | |
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Regardless, the resulting shudder (35d) when starting it and delay (even if short) when taking off is irritating and in my opinion could be unsafe. As a result I shut it off immediately upon start-up. In the States you have the option of deactivating it but here in Europe BMW says we are stuck with it. |
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01-14-2013, 04:51 AM | #9 |
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I'm not aware of any empirical evidence which could be used to make any judgement on wear characteristics of the many engine components affected by increased stopping and starting. This is obviously new technology and car manufacturers are all squeezing as much miles to the gallon / litre as is possible to suit the green lobby (and of course our pockets). City driving will obviously dramatically increase the number of stop starts so wear will no doubt take place quicker than driving in the country. I have just gotten into the habit of switching it off manually at the start of each journey but there may be a way of de- coding it? There is a rather large thread on this topic and you may want to ask the question there, of course it may be possible for your dealer to do it FOC. There are many forum members who have came to accept and even like the system, it's just not for me and I don't want to be regretting using it one day when the starter just makes a grating noise instead of turning over the engine.
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01-14-2013, 06:03 AM | #10 |
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I have just taken delivery of my X3 and had the dealer set the default to "off". They requested I sign a form titled "Formal obligation conerning activation of MSA memory function". Which I happily complied.
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01-14-2013, 07:07 AM | #11 |
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I've coded my car to remember the last setting. I also have concerns that the ASS will have a negative impact (in the longer term) with respect to systems longevity.
I do admit that I sometime leave ASS enabled as there are only 7 stops between my home and place of work. With longer signalized intersections the ASS is sometimes appreciated.
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01-14-2013, 07:37 AM | #12 |
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Can you alleviate the wear problem by keeping the clutch in, on manual transmissions ? even in neutral, the flywheel is still connected, unless you press the clutch.
That's a really old trick for cold starts too, as it reduce the inertia needed to start the engine...
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01-14-2013, 08:25 AM | #13 | |
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The moment you touch the clutch pedal, the car will restart. It catches really quickly, but I'd have thought that by the time it starts, you'll probably have the clutch full engaged. hopefully saving some of the additional stresses. Just don't try to move the steering wheel with the engine stopped, as this will also prompt the engine to start again......
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01-14-2013, 04:37 PM | #14 | |
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