05-07-2015, 11:01 AM | #46 | |
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As gthal said please take your car in and get the codes pulled. At least it will be documented for when it reoccurs.
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 |
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05-07-2015, 11:59 AM | #47 |
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I just dropped mine at service today and the faults read were vertical acceleration sensors and "front of car height too low". I know the car isn't too low cuz we only dropped it .75 in the front which is the same as what we dropped in the rear with my KW HAS kit.
They're going to replace the 2 sensors up front first to see if it fixes it and then do a re-initialization. I'll keep you guys informed. |
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05-07-2015, 02:15 PM | #49 |
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Lots of track time although my tires don't allow for much slip angle and I haven't fully spun the car yet so going back to Jeremey Clarkson, he must have been resetting something :P
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05-07-2015, 08:02 PM | #50 | |
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Thought you were talking about street driving. What tires are you using?
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 |
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05-10-2015, 05:01 AM | #52 |
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My m4 have h&r sport suspension, no adaptive suspension on stock tires and when a go to the drag track I get the message. "Drivetrain malfunction". I stop the car, turn off and the code was cleared.
I will go to services department and let you know what happens. |
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05-10-2015, 10:26 AM | #53 | |
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05-10-2015, 01:20 PM | #54 | |
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Nevertheless, if all DSC is turned off it should never intervene. Not understanding that for Tom, unless you mean he was running MDM (Euro?). The U.S. MDM mode is too intrusive to be used on the track, so I runn with everything completely off. I know another member that runs Carbotechs, but I believe he was smart enough to disconnect the EDC sensors for his track day. This may be the temporary solution until the problem is figured out definitively.
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 |
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05-10-2015, 07:48 PM | #55 | |
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2020 C8 Corvette | Z51 | Torch Red ... built and waiting for delivery 2016 M2 | Long Beach Blue | 6MT 2015 M4 | Austin Yellow | DCT 2012 MB C63AMG | 2011 E92 M3 | 2010 E92 M3 |
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05-10-2015, 10:54 PM | #56 | |
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I'm not sure where these sensors are? If they're at the top of the strut, seems that they should be far enough away to not be affected by the heat? Also, the other member that had this issue on track was at an autocross, so don't think his rotors would've gotten that hot with the short session? I guess I'm just grasping at straws while my M4 sits at the dealer for the third time for this. Hopefully they've got some better ideas than I do!
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 |
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05-11-2015, 09:30 AM | #59 | |
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The sensors are up top btw, if you lift the rubber covers from the strut tops, you'll see the them, the harness is exposed outside of the covers also. |
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05-11-2015, 12:22 PM | #60 | |||
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 |
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05-11-2015, 10:04 PM | #61 |
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Got the call that my car was done. They ended up replacing the right front strut and right front sensor again. Speaking with the SA when I picked it up, he said they replaced it, because that's what engineering wanted them to do. The faults that the sensor is throwing are "plausibility faults" which, when I inquired, means that "they don't know why its throwing the faults". Their latest theory is that the track tires somehow send the strut/sensor out of "bounds", but when he continued on to say "maybe they skip/skid more than OEM tires" I dismissed that theory since the R888 are much stickier actually.
I don't want to sound too critical of the dealership. Sometimes the hardest thing to do is to say "we don't know what is wrong" which that is basically what they are doing for now. The dealership has put in a lot of effort trying to figure out what exactly the issue is, but unfortunately it seems to be above their knowledge base to found the answer. A "PUMA" case has been started and they still are encouraging me to track the car more so that it might help them find an answer. Even mentioned maybe having a field engineer go with me to the track, but surely blowing smoke on that. Anyway, happy to have my car back. I might test it at an early morning test and tune on June 20th, but really nothing much going on here in Phoenix for the summer with the heat.
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 Last edited by MaynardZed; 05-11-2015 at 10:30 PM.. |
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05-12-2015, 11:29 AM | #62 |
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So I'm noticing that in the three instances reported in this thread we have:
1. Non-stock tire sizes + track tires 2. Non-stock tire sizes 3. Lowered ride height And on the other hand we have hundreds of stock m3s being tossed around tracks for almost a year now with no related stories that I know of... |
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05-12-2015, 11:54 AM | #63 |
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Seemingly related perhaps have any of you also noticed how weak a constitution the cruise control now has in corners? I used to take a corner on my commute at 75 mph in my E92 and the F82 now wants to drop 10-15 mph. It's weird how sensitive this car is to roll. Obviously you wouldn't use cruise at the track but it is indicative to how sensitive the stability sensors seem to be for this car.
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05-12-2015, 03:24 PM | #64 | |
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BTW, I think very few F8X have been tossed around the track extensively with the stock Michelin PSS. They have almost universally been deemed as a poor track day tire by anyone above beginner level.
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Road course laptimes for BMW M4 2015 6MT
WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889 Last edited by MaynardZed; 05-12-2015 at 03:41 PM.. |
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05-13-2015, 03:59 PM | #65 | |
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Of course, just because he is there with you, the error will not happen. Good they did the PUMA; seems like they're taking it to the next level |
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05-13-2015, 06:25 PM | #66 |
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