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2010 2011 BMW 5 Series Forum F10 Traded F30 335i for F10 535d and ASS is killing me. |
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05-06-2014, 04:26 AM | #23 | |
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05-06-2014, 05:19 AM | #24 | |
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The bigger issues are not necessarily analysed to the same criteria. If they were, we'd likely be encouraged to run our cars much longer and save the emissions of building new ones. HighlandPete |
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05-06-2014, 09:06 AM | #25 | |
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A different way of looking at this issue would be to ask what good it does to keep a gasoline or Diesel engine running for periods when it is not needed, compared to the waste of resources and added pollution that the running engine causes. No one can argue, on the other hand, with your assertion that you don't like the feeling of the system. I would just say that your personal preferences are a matter of -- at best -- indifference to the rest of us. |
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05-06-2014, 10:19 PM | #27 | |
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Ok so with temperature well over +3c and engine up to temp and no A/C/Heat even on I guess the only possible problem in that list is battery charge.
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05-06-2014, 10:24 PM | #28 |
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To address those that think it makes no mpg difference...I had my 2012 F30 335i for 2 years. Both winters I averaged 3mpg less than I did in the sprint/summer/fall when the start stop was working frequently. In the winter it never turned on and I felt it at the pump and by monitoring the trip computer etc.
No doubt in my mind that it makes a difference. Plus to those that don't like the shaking sensation, it's a trade off, I love the silence of sitting a light with the car off. Music sounds better, you hear other vehicles, people on the street, sounds in the distance...I think that positive sensation or 'experience' is worth the negative 'shake sensation' on restart. Thoughts? |
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05-07-2014, 08:28 AM | #29 | |
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It's just different. Some folks can't handle change. |
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05-12-2014, 07:18 PM | #30 |
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1. So I tried disabling ASS for a few days to see if it gave battery a chance to charge. When I enabled it again I felt that the stop start worked significantly better. I'd say it went from working 50% of the time to 70% but still nowhere near the 95% of the time ASS activates on my gasoline powered 335i.
2. My 535d is at the dealer for a BMW assist problem and they gave me a 2013 535i as a loaner. It shut off (ASS worked) at the very first light even though engine was no where near up to temperature. And it has shut off at over 90% of the stops on my drive home. It's FANTASTIC! I will keep testing the gasoline 535i loaner to confirm. So is my problem the diesel engine or more likely a battery issue? Any more feedback please from diesel drivers on % frequency their diesel auto start stop works? Thank you. |
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05-14-2014, 12:04 AM | #31 | |
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Back in the dark ages (late 70's, early 80's) I owned two MB diesels. They were fantastic cars but their only flaw was the occasional battery problem. If the cars weren't driven enough at high speed their massive batteries weren't charged and therefore, failed to start the engine due to the high compression of diesel engines. I once killed two gas-powered car batteries and a tow truck battery just to start my dead car. They need significantly more battery juice than petrol cars. While times have certainly changed, batteries have changed relatively little. My 535xi ASS often re-starts in traffic if the wait is too long so the condition of the battery is probably crucial to the programming of ASS. Good luck with the problem but it may simply be the design of the diesel ASS.
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2018 640ix GT; Alpine White, Blk Nappa, Piano; M-sport, Premium (Ceramic, SIRIUS, Soft-close, Vent/Massage Comfort seats, Surround, Sunshades, Parking Ass't), Advanced Driver Ass't (Lane keep, Steering/Lane control, Cross traffic, ACC with Stop/Go), Smartphone, Tint.
Retired: 78 300D, 81 300SD, 87 190E, 88 Porsche 924, 89 260E, 93 300E, 97 Volvo 850, 98 E320, 03 BMW 325iT, 02 C230 Sport Coupe, 08 BMW 535i, 12 BMW 535i X-drive |
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05-14-2014, 12:50 PM | #32 | |
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Thanks for the feedback.
Question: Once your vehicle is up to temperature, what percentage of the time would you say it shuts off at lights/stops? Mine is well below 50% of stops even once it's up to temperature. Quote:
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05-14-2014, 10:34 PM | #33 | |
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Mine doesn't even get up to operating temp before ASS starts. I have discovered that the way I stop seems to affect ASS. If I stop with variable brake pressure it doesn't always work. Steady pressure works best. I always use AutoH as well. If the car is moving slightly so AutoH doesn't engage then ASS doesn't engage either. If I'm in Stop and Go traffic it will stop working by itself if the stops are short. I also turn it off just by using Sport on the shifter for those times that I need the engine to be on all the time, such as, left turns or residential stop signs. As I stated earlier ASS often re-starts itself at especially long stop lights. In summary, when I want it to work, I would guesstimate that it functions close to 98% of the time. There are rare times when I wonder why it didn't work. ASS re-starts are so smooth passengers don't even notice other than the noise level changes.
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2018 640ix GT; Alpine White, Blk Nappa, Piano; M-sport, Premium (Ceramic, SIRIUS, Soft-close, Vent/Massage Comfort seats, Surround, Sunshades, Parking Ass't), Advanced Driver Ass't (Lane keep, Steering/Lane control, Cross traffic, ACC with Stop/Go), Smartphone, Tint.
Retired: 78 300D, 81 300SD, 87 190E, 88 Porsche 924, 89 260E, 93 300E, 97 Volvo 850, 98 E320, 03 BMW 325iT, 02 C230 Sport Coupe, 08 BMW 535i, 12 BMW 535i X-drive |
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05-14-2014, 10:48 PM | #34 | ||
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05-15-2014, 06:50 AM | #37 | |
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05-21-2014, 02:23 PM | #38 |
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I'm seeing the same (or lack thereof). There doesn't appear to be any rationale or pattern as to when it's engaged or not. When I would expect it when I stop after a good stretch of driving, it doesn't engage. But then again, when I would not expect it (like some mornings 5 minutes out of the garage), it kicks in when I'm not at my normal engine temp. 8k miles on the car, so I'll ask when I bring it in. I am loving the 35mpg average around town and even got 52mpg on one trip!
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Current: 2018 BMW X3 30i | 2014 MINI Cooper S | 2007 VW Jetta 2.5 Retired: 2015 X3 28i | 2011 BMW 535i xDrive MSport | 2008 BMW 535ix | 2005 BMW X5 4.4i | 2002 BMW X5 4.4i | 1986 BMW 325e (275k miles) | 1983 BMW 320i |
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05-22-2014, 10:47 PM | #39 |
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Problem solved!
Dealership had my car for a week to fix an SOS error problem. Finally they replaced the TCU module that was faulty. And now the Auto start stop works flawlessly and predictably every time! I can advise it is as frequent and predictable as my 335 and the 2013 535 loaner I had for a week. Diesel ASS is no less functional. |
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