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Vibration at highway speed (doubtful related to wheel balance) - please help
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08-31-2018, 03:45 PM | #133 |
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I was satisfied with the M3 arms but after few months my car developed a nasty vibration that increases with the speed. I actually think the control arms picks up the road imperfection and amplifies the vibration. I am thinking to go back to original arms, the combination bilstein b8+ m3 arms is too hard for normal driving and the NVH has increased.
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11-14-2018, 06:00 PM | #134 |
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just started experiencing something similar to this... on 6th gear at around 75, the car gets really wobbly (front and back motion). steering wheel has no vibration. on the same speed on 5th gear, no shaking. what do you guys think - related issue?
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11-16-2018, 03:00 PM | #135 |
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My car has been doing this for years. Pisses me off because I like the car but tired of throwing money at diagnostics only to get the same crap. Mechanics keep trying to re balance, or replace my tires, rotors and brakes. Even when I tell them its been through 3 sets of tires and 2 sets of rotors.
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11-17-2018, 12:25 PM | #136 | |
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I'm assuming this is just due to the stiff suspension and bushings in the M3 arms, but I have noticed it its worse when the car is cold.
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S |
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11-18-2018, 09:18 AM | #138 | |
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11-18-2018, 09:21 AM | #139 |
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None of the mechanics notice anything wrong either. Its why its pretty much impossible to fix. You really got to get it on the highway at high speeds. If you sit there and look at the passenger seat you will see it shaking back and forth really fast. The cup holder vibrates bad if there is something in it.
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11-18-2018, 01:41 PM | #140 |
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Thats because people who dont drive the car daily cant notice such vibrations. It usually takes a lot of money and parts replaced to find the origin.
I lost fate in the mechanics so I am buying the parts and only tell them what to replace. |
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11-19-2018, 09:03 AM | #141 |
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Likely a bad tire or wheel. Road force balance will tell you for sure.
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11-19-2018, 09:20 PM | #142 |
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Everyone got rid of road force around here. Besides its had 3 sets of tires, 2 sets of rotors, 2 sets of control arms. Still does it. I would hope all of these jack ass mechanics I paid for diagnostic fees and hand me 3000 dollar quotes to replace all my rotors, pads, and tires every time would know for sure if it was a bad wheel or tire.
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11-20-2018, 08:32 AM | #143 | |
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Yes, those are typical/expected results when you don't ask the right questions. Good luck trying to find the answer to your issue if you're only reliant on bozos to figure it out for you. Tell me what the road force results were (runout of the wheel, runout of the tire, etc.) and I'll tell you whether or not either is the problem. Without getting that information from the machine/"mechanic", going through the process of road force balancing is worthless when attempting to troubleshoot a problem such as this. Use this to try and find a shop that can actually help you: http://www.hunter.com/gsp9700 |
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11-21-2018, 11:59 AM | #144 | |
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The other thing is it says tires include lifetime spin balance. I am guessing road force elite has a basic mode where they don't match the tires? So they might just use basic mode or something. |
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11-21-2018, 12:06 PM | #145 |
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Correct...either way, force matching is not required to get the road force numbers; the machine will spit those numbers out even during a "basic" balance. The unit of measure is in pounds.
I've found that any amount of road force over 9 lbs produces a perceptible level of vibration inside the cabin on this platform; the higher the number, the more severe...especially as it comes and goes with speed (meaning, you get vibration/hopping of the wheel/tire assembly at 70 mph but not 75 mph, etc. |
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11-21-2018, 12:24 PM | #146 | |
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11-21-2018, 01:57 PM | #147 |
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Well, obviously, the lower the better.
If you don't want vibration? 9 or below. I've found that anything more results in vibration/speed dependent "hop." Some cars are just as, if not more sensitive to road force as ours are (Miata, Corvette, a few Cadillacs, etc. just from what I've seen during research). Most cars don't seem to be as sensitive to road force as ours though. Given that, most road force machines won't "reject" a wheel/tire assembly until it goes over 19+ lbs of road force...so even though you might get a general "passing" grade for any given set of wheels/tires, you'll still feel vibration on this platform. I've found that Michelins tend to have better QC and therefore have a higher chance of achieving low road force numbers without having to go through multiple tires to find a set that will all output single digit road force values. Just my $0.02 |
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11-22-2018, 08:22 AM | #148 | |
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11-22-2018, 09:47 AM | #149 |
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I ordered tires from TireRack...they shipped directly to the installer. The tires that were high road force got shipped back and replacements were sent.
Another time Continental warrantied the tires directly. I must say, as frustrating as it was to go through more than a few tires until I found a proper set, Continental customer service was splendid. After that experience though, I'll likely stick with Michelins from here on out. |
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01-02-2019, 07:44 PM | #151 |
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Cobra94- how bad would the vibration be above 9lbs? I got some new tires on the front (cheap Achilles which I regret) and they were at 26 and 16 before they indexed them. After indexing they got them to 11 and 13 if I recall. Would that still result in a TERRIBLE vibration? Before the roadforce balance, it was vibrating at 60+, now, it's 80+, but it feels like the dash wants to rattle apart it's so bad. Just want to make sure it's not something else and is just bad tires.
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