09-01-2017, 06:39 PM | #1 |
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6MT Auto Rev Matching Change? (Resolved)
I have a 2017 340iX 6MT, built in October 2016, and yesterday the car was programmed (updated to latest i-step) to fix a fault.
Since I got it back, there are a few changes in behavior, and I'm not sure if this is just the way they are now, or if something is wrong. Old behavior of downshift rev matching:
Today, the only way it works is:
It only works if I'm going directly from gear to gear, going down one and only one gear. Can anyone else chime in on what year/model (and preferably build date) your car is and which way yours works? Edit: See this post for an update. BMW has acknowledged the issue, and promised a fix. Edit 2: Fixed. See here or here. Last edited by Araemo; 05-05-2018 at 07:09 PM.. Reason: Link to updates. |
09-02-2017, 01:17 AM | #2 |
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2016 - Never updated since the factory, running same version of factory software, rev matches in all the gears
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09-02-2017, 11:19 AM | #4 |
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My 6MT, built around March 2016, is like the second option you listed. Installing the MPPSK didn't change it.
I've never skipped gears on downshifting, so don't know how this behaves. It doesn't autorev for 1st gear, though, and when I push the stick left (between 1st and 2nd), it revs for 2nd gear without actually going into gear. I do this to make noise when pulling up to a red light. |
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09-02-2017, 01:54 PM | #5 | |
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SOLD: 2016 340i xDrive 6-speed DAW v2.5 turbo E40 | Dorch S2 | VRSF DP | MST intake | AWE catback | 335is clutch | CSF heat exchanger | RK Autowerks intake manifold | Orange M Perf Brake Kit | KW Street Comfort coilovers | GTS taillights V2 |
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09-02-2017, 03:23 PM | #6 | |
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09-02-2017, 03:49 PM | #7 |
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I skip gears when downshifting very regularly and it always rev matches. Took it in for an oil change a few days ago, which I think included some software updates (maybe?) and no change to the rev matching.
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09-02-2017, 07:17 PM | #8 |
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2018 4 series and just drove it home from South Carolina, and I noticed it only rev matches sometimes. I'll have to try and see if it matches your findings because I had no idea why it didn't do it sometimes. I do know it definitely rev matches every time when rowing through gears one at a time. I have a habit of shifting through the gears as I slow down and then only releasing the clutch when i finally decide to accelerate, and it was pretty annoying hearing it rev each time when i wasn't actually trying to put it into gear yet. I just like knowing it's in the appropriate gear in case I need to make an emergency maneuver.
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09-03-2017, 01:44 PM | #9 |
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They don't reprogram the whole car without a reason. Oil changes won't include it unless you had other complaints or there was a recall/service campaign or something special.
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09-03-2017, 07:42 PM | #10 |
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can confirm my car doesn't rev match unless i immediately go to the next lowest gear. even if i coast in neutral for a while then move to what would have been the next lowest, it doesn't rev match. i'm sure i'll have fun figuring this out over the next couple weeks. it was awkward enough trying to get used to not rev matching myself, and now i have to get used to when i still need to do it manually.
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09-03-2017, 09:36 PM | #11 |
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Thanks for the responses. I did call the dealership back and scheduled another visit so they can make sure it flashed right... but I suspect this is a simple programming change. Frankly, it's super annoying. I got very used to the car rev matching for me, and it still does sometimes. I think I'd rather it not do it at all than do it sometimes, because then I could just get used to doing it myself again, but if this is just a change... that's a pretty drastic change to the way the car works that I have to deal with dozens if not hundreds of times per day.
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09-15-2017, 08:10 PM | #13 |
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Wonder when they released the update. My 340 was built in May/June and the MT rev matches in every gear. It even revs in reverse and 1st if I don't push the gas when letting off the clutch. It's nearly impossible to stall when launching. Hope they can fix it!
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09-16-2017, 08:15 AM | #14 |
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Dealer confirmed that 'this is the way it is now'. They're opening an 'info case' to BMW NA now to get a reply from corporate for me. I'm fairly annoyed, in a week and a half driving this way, I still try and use this feature at least once per trip and flub it because I have to pause and think about it and then rev match myself. I shouldn't be cursing at my very new car just because they did a software update.
Note that I didn't say it doesn't rev match in every gear, only that it only rev matches in single gear downshifts not 2+, and not if you start from neutral with clutch out and then clutch in and select a gear. |
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09-19-2017, 10:23 AM | #16 |
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Just as a test, while doing ~45 MPH I shifted from 6th to 3rd, the motor revved quite a bit.
(I didn't actually let the clutch out in 3rd). I did some similar things, 5th to 3rd, 5th to 2nd, 4th to 2nd....engine revved to match each time. |
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09-20-2017, 02:26 PM | #18 |
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Mine only rev matches in single-gear downshifts, I just tried it today. No rev match from 5th to 3rd, or 5th to 2nd, or 4th to 2nd, only when dropping by one gear. But it sounds pretty good once I let out the clutch, especially if I give it a little gas!
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09-20-2017, 03:27 PM | #19 |
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Have you ever had the car reprogrammed by the dealership, or do you know your car's i-step level?
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09-20-2017, 07:39 PM | #20 | |
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I'm not familiar with i-step level. |
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09-20-2017, 10:19 PM | #21 | |
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*: Dealer told me that they couldn't update just the DME to address the fault code, the 'programming process' updates all of them to the current release all at once. That matches what I've read in coding threads too. |
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09-22-2017, 11:50 AM | #22 |
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the other thing that annoys me is i have a habit of jiggling the shifter to make sure i'm in neutral. if i'm in 3rd gear and coming to a stop, i clutch in and shift the neutral but jiggling the shifter makes it try to rev match...twice. for some reason it tries to rev match before i put it in the 2nd gear gate, and in the process of moving the shifter back and forth it'll rev the first two times it hits the left side.
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