08-25-2020, 01:20 AM | #23 | |
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On my previous car, a C63S, a Senior Technician could tell something was up when he took it for a drive to identify an intermittent rattle. He could tell it felt more powerful, but couldn't prove what had been done. As we both know, this forum and its members often diagnose software issues before BMW, and they're often solved by members first too! M |
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08-25-2020, 09:32 AM | #24 | ||
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09-09-2020, 03:19 PM | #25 |
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Quick update on this. I mentioned it to my dealership service dept, and btw they call it controlled backfire (lol). They say there should still be that sound on deceleration and so am taking it in tomorrow for them to have a look.
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09-09-2020, 04:04 PM | #27 |
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Are you aware of a specific FDL in a specific ECU to code via eSysX? Or are you speaking of other tools?
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09-09-2020, 04:08 PM | #28 | |
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Others have reported that this was not an intended change by BMW and have suggested that it could be reverted in a future release but I am yet to substantiate that.
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09-09-2020, 05:40 PM | #29 | |
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09-09-2020, 05:44 PM | #30 | |
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Thanks once again for providing the LOL moment of the day as obviously we have the same sense of humor.
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I can confirm even with the neutered 11/2019.70 release when in Sport Plus or Sport Individual (with the engine in Sport Plus) you still do get some burbles/gurgles on deceleration. That said you used to get it in Sport as well but that is pretty much non-existent post neutering. Last edited by bloozemanAZ; 09-09-2020 at 08:10 PM.. |
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09-09-2020, 06:10 PM | #31 |
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bloozemanAZ, what do you make of the posts claiming this was "not an intended BMW change" and it will be resolved in future releases?
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09-09-2020, 06:58 PM | #32 |
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Going in for 1yr service, anyone know if BMW will force me to update? I've been able to request no updates in some other cars ie Jag and MB with no issues.
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09-09-2020, 08:22 PM | #33 | |
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That said I'd guess BMW is trying to normalize to the lowest common denominator just like emissions or it is a nightmare trying to limit for those states vs like here in AZ. For well over a decade all manufacturers build their cars for the US (domestic and imports) to match the lowest common denominator for emissions control with CA leading the charge initially but all states have now caught up even if still not as stringent. Bottom line is that exhaust sound is now too likely going to be a downward spiral as well with the EU leading the charge and the US along with others following. Last edited by bloozemanAZ; 09-09-2020 at 08:38 PM.. |
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09-09-2020, 08:31 PM | #34 | ||
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Well, since a software upgrade is causing it & I know Bootmod3 can resolve it, I'm hoping someone uncovers an FDL code fix for it in eSys!
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09-09-2020, 08:37 PM | #35 |
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There's no reason for BMW to retroactively reduce exhaust noise, unless it already exceeded what it should be and I do not find that to be the case at least comp'd to some other 2019 2020 perf cars. Something isn't adding up.
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09-09-2020, 11:51 PM | #36 |
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If you’re in the US and had it programmed from 11/2019 to anything newer since ownership, bring it in and tell them it’s quieter if it changed. Once warmed up, try hitting the gas in comfort while parked and see if it pops or has all valves open. They’re supposed to sound the same in comfort or sport when at idle. If not, it’s changed from normal. I’ve proven it and everyone at my dealer agrees after comparing to cars with older software. The more times it gets brought up, the more pressure they’ll have to correct it. It’s not real or critical to BMW engineers until multiple parties bring it up.
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09-10-2020, 10:58 AM | #37 | |
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09-10-2020, 12:05 PM | #39 | ||||
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Also, not this guy above but another person in the organisation with knowledge of such matters, says that basically BMW are only EVER bothered by changes to the engine mapping. Things like this and other little tweaks are not of a concern to them at all, and basically intimated that you'd be fine taking this sort of change out and they'd either overwrite at service / OS update, or otherwise wouldn't even touch it. Only when it's a mapping issue are they in the mood for proving changes were made, or even made and reset. He also mentioned someone who did this with a company that guaranteed it was undetectable, but when BMW found it and questioned his warranty, he managed to get compensation from the tuner company because of that guarantee. All very interesting, and suggests that this change can be reversed with BimmerCode or similar, and that also BMW wouldn't care. |
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09-10-2020, 02:52 PM | #40 |
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My car was purchased Dec 19 and updated once by me OTA in Jan and then hard wired with another update by the dealer in Feb of 20 with the latest SW at the time (needed to correct Connected App remote view issue) and there were no changes to the exhaust sound. after either update.
I also agree that if BMW wanted to they could locate any modifications made to the car, and if a warranty issue arose that may be related they could and may reject it depending upon the circumstances. To me these cars are fast enough for street use and no perf mods are needed.
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09-10-2020, 03:00 PM | #41 |
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For the record, this is what I mean...
Go to 3:40 - 4:10. See also this slightly cringe video, but one I watched about 20x before I got mine: Again, about 4mins in they take it to a CostCo car park to “try and scare people with the exhaust pipe”. This is what was on the demo car I had, but not my new car. |
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09-10-2020, 03:37 PM | #42 | |
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09-10-2020, 05:40 PM | #43 | |
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Well, I loved it and therefore ordered one...4 months later when it arrives, it doesn't sound anything like the car I test drove. Bit of a bait and switch if you ask me!
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09-10-2020, 08:38 PM | #44 |
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My M850i coupe had a March 2020 build date, but I don't know if it was before or after the March software update. In sport mode, the car burbles on almost every down shift and I almost never feel the need to put the car in sport plus. The exhaust, including the shotgun-like cocking sound it makes on up shifts, is one of the major reasons I ordered the car. Based on the comments in this thread, I think I will avoid any software updates when I take it in for its first service early next year.
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