FSD 14.3.2 overcorrect steering harmonic resonance

[meinnovations]

Seems only to be a matter of seconds on straight and level before steering overcorrects and goes into Gallopin' Gertie mode. Reminds me of going into a high-speed wobble at 30MPH downhill standing on my skateboard as a kid. Somehow, I survived those but as you can hear my son was a little scared. It's probably driver's rear tire 5psi below the rest and/or the #1200 camper shifting the CG rearward and FSD not knowing how to handle that, but curious if anyone else has experienced this.

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[Qixer01]

Yep mine does this also. Not as exaggerated as your video.

 

[SCTesla]

Mine does not do this

 

[TyPope]

Seems only to be a matter of seconds on straight and level before steering overcorrects and goes into Gallopin' Gertie mode. Reminds me of going into a high-speed wobble at 30MPH downhill standing on my skateboard as a kid. Somehow, I survived those but as you can hear my son was a little scared. It's probably driver's rear tire 5psi below the rest and/or the #1200 camper shifting the CG rearward and FSD not knowing how to handle that, but curious if anyone else has experienced this.

I've seen that a couple times in person. It's from when the trailer had more weight behind the axle and started whipping side to side... Put my wife straight into the guardrail with all the kids on board. I was leading the convoy pulling a large camper (we were moving). I looked up, saw the side of her trailer and thought "I shouldn't be seeing the side of that." Then, she hit the center guardrail and it looked like an explosion of car parts. Her Explorer hood survived impact but everything else in front of the wheels looked like a big toothless grin.

We were just driving over the three sisters on I-80, I believe. Anyway, it took me 1/4 mile to get my truck and 5th wheel stopped and pulled over. That 1/4 run at that altitude was the hardest 1/4 mile I have ever run. Everyone was okay. Her truck and trailer were not driveable. Two of the four trailer wheels had ... turned inside out... weirdest thing. One front one, one back one on the opposite corner.

I'd be surprised if your condition wasn't related to an improperly loaded trailer.

Another time happened at about 20 mph. We were pulling a load of plywood behind a Plymouth Reliant back in the 1900s. That car whipped side to side until we got down to 5 mph. That didn't stop my Dad from telling me the 2 ways you can stop it. 1. Use trailer brakes to make the trailer stop pushing you. 2. Accelerate to pull the trailer straight. Yeah, we had neither brakes on the trailer nor any power in that car. By the time we stopped from just 20 mph, the entire stack of plywood had slid back a foot. The WHOLE stack. Man, that was miserable... shoving a bunch of them forward and then driving. so. friggin. slow. all. the. way. home.

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