10-26-2019, 09:02 AM | #23 | |
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Is there any difference in vibration levels according to road surfaces? A bit like how tire noise changes on different surfaces, some vibrations are generated from the type of surface. Soft bushings can also be a contributor, any imbalance from rotating components doesn't get totally cancelled out, or hidden. |
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10-26-2019, 09:06 AM | #24 |
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Traditional wheel balancing only using weights is not good enough on the G30 (same thing with the F10´s I had), road force balancing done by an expert is a must! The only G30´s I have driven (including my own) that have been smooth without vibrations are the ones with road force balanced wheels, done when the tires are warm (road force increases when the tires are warmed up) and with preferably no more than 6kg of road force on any wheel assembly.
So if you want a smooth G30, my advice is to do some research and find the best tire workshop in your area and go to them. Why this isn't checked/done by the dealer before the customer takes delivery, I will never understand. |
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10-26-2019, 09:09 AM | #25 |
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Not in my opinion. Doesn’t matter if new tarmac or really rough, still does/did the same.
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10-26-2019, 09:38 AM | #26 | |
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10-26-2019, 09:40 AM | #27 |
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10-26-2019, 09:59 AM | #28 | |
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You get rid of the vibration issue with new tyres and an alignment. You then fit summer tyres. Were these new to the car, on new rims? You have vibrations? Then you refit the 'good set' and have vibrations, whereas before taking them off they were fine? Have I got that correct? |
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10-26-2019, 10:04 AM | #29 |
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10-26-2019, 10:24 AM | #30 | |
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10-26-2019, 11:52 AM | #32 |
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That indicates the wheels are involved. The good wheels must have a mounting position, where there is no vibration. You have been there! Does appear there is a tolerance issue somewhere in complete, tightened down, wheel assemblies.
Has the dealer checked for wheel assembly run-out? Like on hubs, disc faces, tried mounting a rim in several positions and measured for variable 'fitted' run-out? Other than just wheel assembly issues, you have an additional source of vibration, other rotating parts, (drivetrain components). Wheel mounting positions appear to either cancel out or retain vibrations. |
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10-26-2019, 02:16 PM | #33 | |
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Drives: '23 760ix; '23 X3; '23 MB wgn
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Current: 23 760ix (Carbon Black/Tartufo) (after first one totaled) '23 X3; '23 MB E Wagon Prior: BMWs (3,5,7 & 8 series (2x!)) X3, MB (C, E, and S), Alfa GTV, MGB, Audi (A4, A6), Saab, Volvo, Toyota, Lincoln, Chrysler, Oldsmobile, Chevy, Rambler. |
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10-26-2019, 06:58 PM | #34 |
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Road force balance on brand New tyres didn’t solve the problem so the dealer had the car for a whole day for inspection. They told me that they had aligned the wheel angles and optimized the car. Did’t ask many questions as the vibs were gone.
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10-26-2019, 07:01 PM | #35 | |
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10-26-2019, 07:05 PM | #36 | |
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Could be the case but the dealer isn’t willing to replace any further parts as they don’t have a clue. |
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10-29-2019, 02:10 PM | #37 | |
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Further observarions that might give you a clue . I have been on a business trip .. returning from the airport, the outside temperature was 1dgr. Pretty cold. .. guess what the car was almost vibration free, smooth and settled for appr 30-40min. Hard to believe !! Then the vibs came back |
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10-30-2019, 12:46 PM | #38 | |
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The old E39 front wheel 'shimmy' was often reduced with new suspension parts. But it wasn't really the bushings that were worn out, new bushes simply gave more control to the vibrations from an existing wheel assembly balance issue. |
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10-30-2019, 03:23 PM | #39 | |
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10-30-2019, 03:27 PM | #40 |
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Thinking more about it you might be right wrt several sources to vibrations, that either cancel out each other or amplify. I’m really hoping Bmw will provide some feedback...
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10-30-2019, 04:04 PM | #41 | |
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I recall one vehicle which had what appeared to be an engine vibration/stutter or stumble, at about 30mph in 4th gear on a very light load. It was getting at me, as outside that 200rpm rev range (in that one gear), the engine was fine, no vibrations into the car. I was getting frustrated, as no tweaking of the engine parameters changed it at all. While thinking where to go with the issue, I by chance replaced the front tires. Driving away from the tire shop I thought, "something's changed about the engine". Smooth as butter, left me scratching my head, how did tires give that limited engine rev range issue? And only in 4th gear at that particular road speed. I'm a pretty particular guy about tire balance, but there was nothing in running that vehicle which gave me any clue there was a problem with the tires. Something about the drivetrain/tire harmonics, clashed at that one particular set of running parameters. |
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10-30-2019, 04:38 PM | #43 | |
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As I've stated in a previous post, the F10/F11 has suffered similar issues, many threads on it since 2010. Virtually all who have reported solving the issue did so with rims, tires and/or balancing. One user I recall had a balance using the five spigot holes, rather than the centre hub. Positive solution.
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10-31-2019, 05:18 PM | #44 | |
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I have seen the thread but how is this done?? Is there a speciel tool ?? |
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