05-12-2017, 11:14 AM | #1 |
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Steering rack get heavy and contesters
Hello guys, today, after doing track day with my M3 I had a really experience.
After 5 laps, when car got hot, my steering wheel started to act weird. First, I thought, that it happened, because I forgot to turn off the Driving assistant off. I was driving in to the corner, when suddenly, I almost lost control. My steering wheel turned back in to the center position, and car started to break slowly. After few seconds, car released the steering wheel, and I could continue to drive. On the media screen, there was en error, telling me the there is/was an increased force on the steering wheel. Please drive moderately. After some seconds, this warning went away. I could not find it afterwards. After 40 minutes, I decided to go for some laps again. This time I switched traction control completely off, previously it was in MDM mode. Only this time, these steering wheel errors appeared again and again. All the errors would appear only while attacking the corner. After these events, I decided to stop my track day, and went home. No errors or driving issues happened. I did try to google this issue, but it is kind of hard to google for it. Maybe some one know where to search for the answers? These warning are really dangerous on the track, it could easily cause accident. I was lucky to have some track to let it drive straight for a while. Steering rack would not lock itself, it would counter my moves, and it is almost impossible to counter that force. Regards, Pavel |
05-12-2017, 03:50 PM | #3 |
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What setting did you have the Servotronic control (steering force) set to, Comfort, Sport, or Sport+?
I'm guessing that you had it set to Sport+, which artificially increases the steering effort. This can overheat the EPS unit and may have lead to what you experienced. This is why in the M Schools at both Performance Center East and especially at Performance Center West (Thermal, CA, in the desert!), the instructors specifically tell you not to change the Servotronic control to anything but Comfort. I know a couple of instructors from PCW and they told me that they had this problem early on when the school got the F8x. Since the steering in the F8x is electric (EPS), there is really no reason to artificially increase the steering effort, as it will never duplicate the feeling of hydraulic steering. Unfortunately BMW labels the higher settings as Sport and Sport+ and everyone thinks this makes the car's steering feel more "sporty". It may be OK for the street, but this is definitely not the setting to be used on the track, particularly when the ambient temperature is high.
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05-14-2017, 03:55 PM | #4 | |
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I did wheel alignment few months ago, after winter, so it may affect this. I will let you know. |
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05-14-2017, 06:40 PM | #5 |
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Well, that's unfortunate, as that would have been the easy fix!
Good luck in finding and fixing the problem. I hope it doesn't end up being expensive!
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05-15-2017, 02:33 PM | #6 | |
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05-16-2017, 08:39 AM | #7 |
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05-16-2017, 12:58 PM | #8 | |
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He suggested leaving the Servotronic setting in Comfort. His advice is good enough for me. Not sure what other confirmation you need.
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05-16-2017, 01:07 PM | #9 | ||
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There is no power steering pump on the F8X. As you said yourself, the F8X has EPS (electric power steering), where the steering force assistance is provided by an electrical motor that is mechanically connected to the steering rack (see picture below). Quote:
Sport+ provide LESS assist, hence it should put less strain on the EPS motor.
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05-16-2017, 01:08 PM | #10 | |
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05-16-2017, 01:26 PM | #11 | |
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I have over 40 track days with M4, I have never encountered anything like you describe and I use the Sport+ steering setting at the track.
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05-16-2017, 05:09 PM | #12 | ||
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Let me rephrase. In discussing this with my friend, on more than one occasion, he indicated that from what they saw at Performance Center West, the artificially induced steering effort of Sport and Sport+ places a strain on the EPS unit, causing it to overheat in high ambient temperature (100+ at Thermal) under track conditions. He has been an instructor at Thermal and works for BMW NA. He also has a dedicated track car and is a club racer. Some may know him from BMW forums as Southpaw. I highly value his opinions on anything BMW. This is an exact quote of his reply to the e-mail that I sent him in March last year prior to my Euro Delivery when I asked him to clarify the M button settings used at both Performance Centers: Quote:
I'm just the messenger, I'm just sharing information that I was told by people who should know, and this is what I've been told on numerous occasions. Believe what you want. YMMV.
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05-16-2017, 05:17 PM | #13 | |
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I interpret what your friend is saying that it makes the steering FEEL artificially heavy TO HIM. In my book, a heavier steering effort from a power steering system means less assist. From the F8X technical training doc (particularly highlighted section):
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05-16-2017, 05:26 PM | #14 | |
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I may see him on Sunday and if so, I'll definitely have another conversation with him about this.
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05-17-2017, 08:15 AM | #15 | |
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I was calm, after resting a bit, I decided to return on the track, switched all those assistance off... and guess what, it happened again, but this time, there was a sliding car icon on the screen, and there was something about "increased force on the steering wheel..." After 1, 1.5 seconds, all return ed to normal. I switched my DTC completely off, thinking that maybe it was because of the MDM mode... But it happened again... this time, correct icon appeared on my cluster, steering well with exclamation mark. I though, that is it, something happened, I will have an error message. But, after 2 seconds, all returned to normal. Today, I will check my car with PC tools. But until now, I am daily driving my car, and these issues never happened to me again. These issues, happened only on very aggressive corners, with some altitude changes while cornering in. I think, it will be related to wheel alignment. One of my friends told me, that, when a car gets really wrong reads from them, the motor just shuts down. That is why it gets almost impossible to turn the wheels. I will let you know, but at least now I see, why BMW M3/4 where banned from track days in US, if it is equipped with Driving Assistance . I know that it can be turned off, but things that happened if you don't, are really dangerous. P.S. I was using, SPORT/SUPER SPORT/COMFORT modes. So COMFORT on the steering wheel. Forgot to try to switch it in to SPORT or above. Regards, Pavel |
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05-17-2017, 10:54 AM | #16 | |
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Please don't continue to spread false and misleading stories that have already been addressed and resolved. Do your research first. Your situation seems to be unique and you need to address this problem with your dealer.
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05-17-2017, 02:36 PM | #17 | |
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06-16-2017, 08:01 AM | #18 |
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Guys, I have found a solution, after it did it again today, but never came back to me. Lost my steering completely in the 180 corner.
The problem was with negative cord of a steering rack. It was lose. After cleaning and fixing it back together, now all works like a charm!!! |
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06-18-2017, 06:05 AM | #20 |
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There is a grounding cord, under the right front fender. Easily accesible after removing that fender. The cord was loose. I will post a diagram when I will have access to my PC.
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11-18-2020, 08:54 AM | #21 |
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So I have the fender liner off. Can you tell me where the ground bolt for the power steering motor is?
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11-18-2020, 11:15 AM | #22 |
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