astrowunder
Member
I haven't heard it while driving yet. I've had several 100+ mile trips below freezing. However it happens nearly every time I supercharge- usually once or twice every 20 minutes.
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New owner of a LR AWD M3 ~1400 miles, stopped at SC today to have the sounds investigated. I, like others, hear the ‘thunk’ sound both within minutes of starting supercharging, and ~40 minutes into a drive. The SC tech asked if there are any errors/alerts on the screen when the sounds happen. I have not had any errors/alerts on the screen. The SC tech said the A/C compressor (located in front of the front passenger footwell and likely under the frunk, rear leftish area, as you look at the car from the front) turning on will cause this sound ~40 minutes into a drive as the car starts cooling down the battery. While Supercharging the same loud sound is caused by the high voltage contacts (located under the rear seat) connecting, per the SC tech. Here’s an example of the sound I found online that another M3 owner recorded Clunk On M3 P3D-
From Model 3 Owners forum (Colorado Electric) response from Denver service:
“I've also done some research on the banging sound under the floorboards, and I've found that the issue is considered normal operation related to thermal expansion of the battery pack. Due to the battery pack using a thinner steel on the top of the battery pack, temperature changes of the pack can result in an "oil canning" type noise that will be most noticeable when driving or charging.”
Exactly—another good analogy. Temperature needs to be on the chilly side. Happens frequently on mountain passes and it may also be a sealed container phenomenon because it seems to happen even with small power draws.Like thin steel trays in the oven when it flexes and makes a loud clunk after heating up? I’ve never heard it while driving but always when supercharging.
I heard the same noise multiple times while supercharging yesterday - it was 30 degrees out - I owned a MX 3 years and never heard these noises while charging even in 0 degree weather, they must be using cheaper metal around the batteries - Not acceptable for Tesla to say it is normal. It sounds dangerous to me.New owner of a LR AWD M3 ~1400 miles, stopped at SC today to have the sounds investigated. I, like others, hear the ‘thunk’ sound both within minutes of starting supercharging, and ~40 minutes into a drive. The SC tech asked if there are any errors/alerts on the screen when the sounds happen. I have not had any errors/alerts on the screen. The SC tech said the A/C compressor (located in front of the front passenger footwell and likely under the frunk, rear leftish area, as you look at the car from the front) turning on will cause this sound ~40 minutes into a drive as the car starts cooling down the battery. While Supercharging the same loud sound is caused by the high voltage contacts (located under the rear seat) connecting, per the SC tech. Here’s an example of the sound I found online that another M3 owner recorded Clunk On M3 P3D-
It's frequently referred to as "oil canning", and it has nothing to do with "cheap metal". The oil canning phenomenon is this: Have you been around some kind of metal container that is sealed airtight? And there is some kind of changing of temperature going on, so the air inside the container is getting hotter or colder. The trapped air is changing in pressure, and can be starting to push or pull on the metal bottom of the can. If the surface has a bit of a curve against that air pressure direction, it's just building up force against it. At some point, the air pressure will make a "thunk" sound as the metal gives way to be curved in the other direction. You can hear this kind of thing with sealed gas cans or oil cans or things like that that sit in the sun or maybe were sealed when it was warm and then they sit overnight and get cold.I heard the same noise multiple times while supercharging yesterday - it was 30 degrees out - I owned a MX 3 years and never heard these noises while charging even in 0 degree weather, they must be using cheaper metal around the batteries - Not acceptable for Tesla to say it is normal. It sounds dangerous to me.
Thanks I actuallyCheck out this link:
"Thunk" sound while supercharging while cold and changing altitude
Hope this help.
Having the charge stop in the middle for a few seconds OR go to a much lower level and then go higher again isn't all that uncommon. It's some sort of glitch in the SC electronics and has nothing to do with the popping sounds.