03-28-2024, 01:33 PM | #1 |
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Car swaying at high speeds
I used to take my m3 xdrive on high speed runs a lot, over 130+ and the car has always felt planted. I changed my pzeros to PS4s and it feels terrible, the back feels delayed to the front and at high speeds there is no control over the car, no vibrations just the car swaying from left and right. This is the same thing that happend to my x6m and I can’t figure it out, it’s been more than 500 miles to the new wax is definitely off, I hate it and I can’t figure it out. Tires were heated up aswell, had an m340i before this and had same tires, no problems at all. What is going on, why only on the m’s this happens
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03-28-2024, 03:20 PM | #3 |
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Pressure are too high, especially in the back if you say you feel the back sway too much. Anything at 40 or past it will feel like that and even more so on the bs soft sidewalls of the Michelins. Lower to 36 or 38 and see how it feels.
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03-28-2024, 03:34 PM | #4 | |
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03-28-2024, 03:43 PM | #5 |
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Swaying? You might be "tramlining" a bit. Stickier or wider tires can do this. Alignment might be out of whack too. And like others stated, PSI (especially in the rear) is a bit high and will only get higher the faster you go.
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03-28-2024, 07:23 PM | #6 | |
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I was reading the CS track day front page and at the track the PS4S was seeing huge jumps in tire pressure. |
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03-28-2024, 07:42 PM | #7 |
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I went with what it said on screen to do when it gave me error it said inflate to 45 in the rear
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03-28-2024, 07:59 PM | #8 |
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03-29-2024, 12:30 AM | #9 |
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03-29-2024, 09:50 AM | #10 | |
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See if your tire setting is set to winter tires. Change it to summer and run the reset. If that doesn't work have the dealer check it next time you're in for service. |
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03-29-2024, 11:48 AM | #12 | |
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03-29-2024, 01:16 PM | #13 | |
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& no more swaying issues moving forward Rn your front end grip is considerably higher than your rear . Hence the floaty feeling at triple digit speeds
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03-29-2024, 09:19 PM | #14 |
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I like to add that you can change the setting for the tires, at the tire pressure settings, they are asking if you are driving summer tires, and even the sizes, this will affect the settings for the tire pressure.
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03-30-2024, 11:45 AM | #15 |
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Besides the pressures, if the tires are brand new, they need to scrubbed off a little first, so the initial 200-300 miles won't be optimal.
Also, check your alignment, specifically the toe settings. Mine were really off from factory, and that would create instability at high speeds.
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