05-14-2017, 09:57 PM | #24 |
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Don't think it's a wheel balance issue because I don't have any steering wheel vibration at all
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05-14-2017, 09:58 PM | #25 | ||
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Near where I live there's really bad spot. (For the Washington State locals - southbound on I-5 just south of Tulalip casino). When I'm driving that stretch of highway - there's no potholes. The road looks fine. But there's a mile or two where the Tramlining with my car is so bad that I have to put the steering on comfort mode and hold onto the wheel with both hands. First time I drove that area in my M4 I thought my electronic steering was going haywire. Completely unstable. I also never experienced it with my old 335. The thinner tires aren't as vulnerable.
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05-14-2017, 10:02 PM | #26 | ||
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05-15-2017, 03:08 AM | #27 |
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Not the tyre pressure.
If it is wheel of tyre imbalance, you'll feel vibrations at higher speed but it won't pull you in either direction. Check your wheel alignment in particular your Toe alignment. Toe in or out in either wheel or both can make the car wonder left or right.
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05-15-2017, 05:20 AM | #28 |
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Couple of points
1. Are you checking tyre pressures with cold tyres? As soon as you drive the car the air in the tyres heats up due to sidewall flexing and you will underinflate if you then inflate to the recommended pressure
2. Are your tyres wearing evenly.....check tread depth across the tyres and look for small variations (you've only done 2000 miles so differences will be minor). Any small variation indicates a misalignment 3. Get your wheel alignment checked (front and rear). The factory has quite wide tolerances and if one side is at 1 extreme and the other at the opposite extreme your alignment would still be within factory spec but you may well notice symptoms at high speeds on certain road surfaces 4. Is this instability only on 1 road? Does the road have small grooves in the tarmac in the direction of travel i.e does it look like the tarmac has had a rake pulled along it? This is absolutely the worst kind of tarmac surface for wide tyres. 5. Are all your tyres mounted correctly? Michelins are each labelled OUTSIDE which denotes tyre direction. You're car should not wander at higher speeds, although poor quality tarmac can cause tramlining. Tramlining feels like the car is following grooves and you can feel some pulling in the steering. If the car just feels vague with no pulling, its not tramlining. In German this condition is called 'Schwammig' which translates to 'Spongy' and perfectly reflects how the car feels. Last edited by SteveC; 05-15-2017 at 07:04 AM.. |
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05-15-2017, 07:30 AM | #29 |
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If it's reliably unstable on all roads probably alignment or tire pressure. If it's just a few road probably that road.
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05-15-2017, 11:19 AM | #31 |
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Would do speed limiter all the time in my m4... (and over in mexico due to going down hills occasionally.
Solid as a rock, as others said check alignment, tramlining, and play with the steering wheel controls sport plus would cause the steering wheel to become as heavy as possible. Also realize no dealership is going to help you diagnose these problems as they won't reasonably test the car under those conditions. I learned that with my e92 m3 that would have an odd vibration only from 87-93 and turned out to be a small nail/bubble in one tire lol. They of course refused to put the car to these conditions to isolate the incident, after two visits they found the bubble and nail lol. |
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05-15-2017, 11:19 AM | #32 |
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wheel alignment or tire issues.
I went over 155mph (speedo indicated) couple weeks ago playing with another car. it was the first time I went over 125 (in four wheels ;-0) in a very long time. car was so stable and smooth I didn't realize I was that fast till I bumped the rev limit and looked down. i have 265/285 tires. never had an alignment in 20k miles. |
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05-15-2017, 12:39 PM | #33 |
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no offense but 109 is nothing in these cars. I have taken my car to the limit (in mexico) many many times and at 145 and up is where the car starts to shimmy, no matter how smooth the road.
The incremental air resistance and the way the car amplifies each bump in the road when you get within 10 mph of the limiter makes the car almost impossible to handle.
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05-15-2017, 12:48 PM | #34 |
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Add one psi in the rear and you are good to go.
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05-15-2017, 12:49 PM | #35 |
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On my Euro delivery I bumped the rev limiter a number of times. The car was smooth as a train all the way up to whatever the limiter actually is. . . I think my speedo was reading 163.
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05-15-2017, 01:26 PM | #36 | |
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Sounds like you have the need to make your inch sound like a mile. No offense.
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05-15-2017, 02:00 PM | #37 |
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Mine Is Rock Solid At Warp Speed. The Car Is Planted And On Rails. If Your M Car Feels Less Solid Than Your 335 I Strongly Suggest You Take The Car To The Dealer For Service.
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05-15-2017, 02:27 PM | #38 |
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did you call me Dom? as in Fast and the Furious? If so, you win the internet, and have my full and unconditional apology.
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05-15-2017, 04:03 PM | #39 | |
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She has a 335is Coupe and I did 260 km/h (indicated, at the limit) in her car during her Euro Delivery in 2011. The M4 was a sharp contrast to her car, as it took a lot of effort to keep her car in my lane. The rear end definitely felt a bit "floaty" and squirmy. And for those talking about the "rev limiter", this has no bearing on your top end, and is different than the electronic speed limiter. When I hit top end the DCT was in 6D and the tachometer read about 6200 RPM (see photo, sorry about the glare). The electronic speed limiter is a soft limiter. You hold your foot to the floor and the car keeps accelerating until it just stops accelerating, nothing like hitting the rev limiter.
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05-15-2017, 05:28 PM | #40 |
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I've hit 150 several times and it's been solid as a rock. It's the most stable car at triple digits I've ever owned. Check your alignment, and wheel balance at a reputable shop.
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05-15-2017, 05:30 PM | #41 |
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Your autocorrect is bonkers. Better get that checked.
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05-15-2017, 09:29 PM | #42 | |
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05-15-2017, 09:38 PM | #43 |
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Agree with all that said car is solid as rock.. I have gone as far as 180km/hr with no issues (too scared to go any faster on Canadian roads)
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05-16-2017, 05:09 AM | #44 | |
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