02-10-2013, 11:49 PM | #1 |
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Full stops
Hello all,
I recently purchased a 2013 328i, and I heard that at full stops, the car shuts off to save gas. I always thought that when you turn off a car, then turn on a car, it uses more gas, so why does the auto shut off, "save" gas? Has BMW changed something with the engine? |
02-10-2013, 11:55 PM | #2 |
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the quick fix to that is, dont use the ASS, always turn it off.
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02-10-2013, 11:57 PM | #3 |
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I read somewhere that the break even point is four seconds. If the car is off for four seconds than you use less gas than restarting it.
Can't remember where I read that. |
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02-11-2013, 12:24 AM | #5 |
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You will ultimately save fuel using the auto start/stop if tend to hit a lot of stop lights. It is not that bad and you get used to it quick. Sometimes it is annoying if you are getting ready to pull out into traffic, but really.. it is not that bad.
And it is not only for saving fuel, it is also for saving the environment... My guess is most cars will have ASS over the coming years. |
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02-11-2013, 12:27 AM | #6 | |
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02-11-2013, 09:06 AM | #7 |
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Personally hate the judder from the engine turning on/off from ASS. May be less noticeable in the summer, but right now it's very noticeable. Had it coded asap.
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02-11-2013, 09:15 AM | #8 | |
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02-11-2013, 09:26 AM | #9 |
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I've heard and believe this too.
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02-11-2013, 09:53 AM | #11 |
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This is what i want to know too. I always leave mine on because i get stuck at multiple traffic lights on my daily commute. Seems like it's not good for the alternator but I'm not a BMW engineer..
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02-11-2013, 09:57 AM | #12 |
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Also, do you remember the days when people with turbo cars would have a turbo timer to leaver their cars on so the turbo doesn't bake after being run hard? I don't know if this is a non-issue now but I did wonder that after I did some sprited driving and at the next stop light the engine turned off.
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02-11-2013, 09:59 AM | #13 |
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Sounds about right to me. Starting a cold engine uses much more fuel, which I think is where some confusion comes in, but cold starts are irrelevant for the ASS function (the engine should still be fully warm for ASS restarts).
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02-11-2013, 10:08 AM | #14 |
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02-11-2013, 10:10 AM | #15 |
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Saving some gas mileage is an adequate motivation for me to endure a jolt restarting. The great mileage pushed me towards the 328 rather than the 335, and this car rather than a Mercedes, Audi, or Cadillac. And I do like the silence of the motor being off when stopped. Also, I tend to consider BMW and legislators experts of how things should work for engineering and energy policy, unless it impedes me getting from here to there quickly.
Given the uncountable daily irritations, ASS doesn't even make my top 100. |
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02-11-2013, 10:50 AM | #16 |
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Me too, I'm hoping it came from BMW and not urban legend.
I think since the cars are direct injection there is less economy loss with the start/stop than if it wasn't. I'm no expert though... It also seems like I read that, while it provides for an increase in fuel economy if you sit longer than 4 seconds, it's primarily aimed at reducing emissions. |
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02-11-2013, 10:58 AM | #17 | |
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02-11-2013, 11:44 AM | #18 |
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I would have no problem using ASS but after I read in the manual that this feature will "cause additional wear to certain components" (engine?) I decided better not use it since I plan on keeping the car for over 10 years. People complain that the ASS sounds harsh on the engine when it starts up after a stop but surprisingly I found it to be very unnoticeable and quite subtle.
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02-11-2013, 11:52 AM | #19 |
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02-11-2013, 12:15 PM | #21 | |
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02-11-2013, 12:22 PM | #22 | |
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