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      05-14-2017, 09:48 PM   #23
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must be your car / alignment or something. car is solid as a rock, track driving down a front straight at 145mph
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      05-14-2017, 09:57 PM   #24
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Quote:
Originally Posted by azn_fcuk View Post
Check the weights on your wheels to see if any have fallen off perhaps they need to be balanced again.
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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Quote:
Originally Posted by michaelalex17 View Post
Should have clarified I am running the stock MPSS tires with about 2,000 miles on them. I think the issue might be tramlining, since I did about 110ish on a different road in Mexico today and the car felt very stable. The original road I was on seemed very smooth so I don't know why that would have happened.
That's what's weird about Tramlining. The road can seem perfectly smooth and you still get it. It's all about the little rut that forms from all the cars running on it - not potholes and cracks.

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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Quote:
Originally Posted by F83 View Post
Quote:
Originally Posted by michaelalex17 View Post
Should have clarified I am running the stock MPSS tires with about 2,000 miles on them. I think the issue might be tramlining, since I did about 110ish on a different road in Mexico today and the car felt very stable. The original road I was on seemed very smooth so I don't know why that would have happened.
That's what's weird about Tramlining. The road can seem perfectly smooth and you still get it. It's all about the little rut that forms from all the cars running on it - not potholes and cracks.

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 tram lining 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.
At what speed is that at though? Because there is any area of high by my apartment and whether I am going 50 or 80 I can feel the car pulling back and fourth and I can clearly see the indentations in the road and it's tramlining (happens in every car I drive over this section of road with). However, the section of road I am talking about if I am going anything under 100 the car feels perfect and smooth, but over 100 is get twitchy and darty and doesn't feel planted
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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, 10:55 AM   #30
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Thank you all for the very helpful replies. I attached a quick pick of the tire pressure when cold.
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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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Quote:
Originally Posted by dkhm3 View Post
No issues here, went 109 the other day and solid.
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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Quote:
Originally Posted by michaelalex17 View Post
Thank you all for the very helpful replies. I attached a quick pick of the tire pressure when cold.
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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Quote:
Originally Posted by frankiebones View Post
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.
Hey Dom, read the OP's post again, his car feels unstable at 100+ miles. That was my response to the OP.

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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Quote:
Originally Posted by dkhm3 View Post
Hey Dom, read the OP's post again, his car feels unstable at 100+ miles. That was my response to the OP.

Sounds like you have the need to make your inch sound like a mile. No offense.
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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Quote:
Originally Posted by frankiebones View Post
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.
Not my experience at all. As I mentioned earlier, I top-ended my M4 on the German Autobahn at 271 km/h (168.4 MPH). The car was absolutely rock solid, with no squirming, floatiness, or anything else that would remotely be described as unstable. My wife repeated this about a week later and had the same reaction about how stable the car was.

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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Quote:
Originally Posted by NewM3driver View Post
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.
Your autocorrect is bonkers. Better get that checked.
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      05-15-2017, 09:29 PM   #42
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Quote:
Originally Posted by jmg View Post
Quote:
Originally Posted by NewM3driver View Post
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.
Your autocorrect is bonkers. Better get that checked.
Lol. I wrote it with the cap lock on and was too lazy to change it. Either way.... the car is very stable
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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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Quote:
Originally Posted by michaelalex17 View Post
My 2015 M3 with active suspension feels unstable above 100mph (tested in Mexico). I am recently coming from an e92 335i and that car felt very planted all the way to 155. When I am going 100+ on a perfectly flat and straight high way in the m3 I have to make a lot of steering corrections just to keep it straight and it doesn't feel as planned. The sensation is almost like is a gust of wind were blowing the car from side to side. I have tried all the different steering and suspension modes, but the second I go over 100mph the car starts to feel twitchy and not planted. The tires are filled to 33psi all around (door insert recommended tire pressure) which honestly seems low to me would think it should be around 38 front 40 rear. I also thought it could be an alignment issue but the car tracks perfectly straight if I let go of the wheel. Any thoughts on this issue would be greatly appreciated. Thank you
I had one incident where car felt like it was swaying left to right at higher speed like you described. Like the wind was blowing me side to side. Scared the sh*t out of me. So its not an isolated incident.
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