A back and forth shake on highway bumps.

[Kee_Chain]

Hello everyone, I hope you are doing well,

I noticed something today, every time I go 55-70 MPH, my car makes a back and forth shake when hitting bumps. It is not dangerously violent but subtle, it is annoying and uncomfortable. I do have the 20in Induction wheels but I highly doubt this is the cause. Anyone else with this experience?

 

[jcanoe]

Sometimes setting the tire pressure of the rear tires slightly higher or lower than the tire pressure of the front tires can reduce the forward/back pitching motion.

Start with all 4 tires at the same cold tire pressure shown on the label in the driver's door A pillar.

Add 1 to 2 lbs above the recommended tire pressure to both rear tires and test the ride.

Reduce the tire pressure of both rear tires 1 to 2 lbs below the recommended tire pressure and test the ride.

Repeat if necessary by resetting all 4 tires to the recommended pressure, then slightly increasing or reducing the tire pressure in the front tires. Test the ride and compare with how the Model Y rode with the rear tire pressure set slightly lower or higher than the recommended pressure.

For reference I have the 19" wheels and have found that my 2020 Model Y rides better when the tire pressure of all 4 tires is set 1 to 2 lbs higher than the recommended 42 PSI. I judge the ride as improved when driving over rough surfaces. I have not experienced the pitching motion you described.

 

[Kee_Chain]

Hello Jcanoe,

Thank you for the advise, I am going to try this first. If all else fails, service can always help take a look.

 

[WattsappMTL]

For what it's worth, I've been having the same problem on a particular stretch of new concrete highway. I'm a lot more aware of it if my head is close to the headrest because it keeps smacking me. The other day I was driving my Golf Sportwagen and noticed similar behaviour but with a lot less movement, probably would have ignored it if I hadn't been sensitized by the experience with the Tesla. I'll try playing around with tire pressures to see if I can damp out the harmonic motion.

 

[jcanoe]

Another thing you can try is to load up the lower storage bin in the rear hatch area with extra weight. Carrying unnecessary weight can impact your efficiency but in a vehicle that already weighs 4400 lbs before passengers and luggage it may not make a noticeable difference in range or efficiency.

 

[Stach]

For what it's worth, I've been having the same problem on a particular stretch of new concrete highway. .

I have this exact same problem on several concrete roads around here too. The Model Y is Extremely sensitive to the joints in concrete roads and rocks back and forth on some of them. The Model 3 that I used to have had no such issue on the exact same roads. I was hoping / thinking that the Model Y would have a better / softer suspension than the Model 3, but boy was I was wrong.

 

[touringsedan]

At least I am not alone. It reminded me of an ICE car with a faint cylinder misfire. The sensation of jostling back and forward at random times. 55-65 is the worst. It is driving me nuts. My model 3 never felt like this. I lowered the tire pressure to 38, but it’s not helping. Figured I should break in the car for 5K miles before I try more as I see it mentioned to give it time.

 

[jcanoe]

The ride of my LRMY with the 19" wheels, Continental Procontact RX tires improved after the first 3000 miles. I have the tire pressure set to between 43 and 44 PSI.