Rear of Y always dirty - why?

[Manbutter]

I’ve noticed that the rear of the Y is almost ALWAYS dirty. As a test, I washed the car yesterday so it was completely clean. 33 miles later on the interstate and there is a thin film of dirt all over the back. Nowhere else - front, sides, top is still squeaky clean. Even wheels are squeaky clean.

But the section from the spoiler down to the rear sill is very dirty for only having driven 33 miles.

There is no exhaust so it cannot be that. Something about the aerodynamics of the car that kicks up dirt on the back??

 

[nate704]

 

[Manbutter]

So this is a known issue in the Y? How about the other Teslas? Apparently, the Y sucks up dirt like a Hoover in the back. Probably cause of the high rear sill and near vertical vacuum creating the pressure suction.

My other gas cars never seem to get this dirty in the back.

 

[RedSupraT]

It is very annoying

 

[nate704]

You cannot "undo" physics (fluid mechanics/aero dynamics to be exact).

 

[brkaus]

Most cars do this to some extent. Tesla many better or worse.

You maybe noticing now because of seasonal dust, color of car, or size of back of car vs previous cars.

Our old car got terribly dirty on the back, but it mostly was a small section below the trunk and above the bumper.

 

[cmaster]

So this is a known issue in the Y? How about the other Teslas? Apparently, the Y sucks up dirt like a Hoover in the back. Probably cause of the high rear sill and near vertical vacuum creating the pressure suction.

My other gas cars never seem to get this dirty in the back.

All of the Tesla models.

 

[Tha_Ape]

I wonder if a rear diffuser would reduce the size of the recirculation zone behind the trunk? I'm guessing tesla would have done that though since it would surely increase range if it worked

 

[patmurphey]

Be glad it's not a typical SUV. The Model Y at least has a sloped back window that stays clear.

 

[dafish]

late season snow

 

[Spinkick]

My corvette is the same way, its just how physics works. A real diffuser that sticks out the back would be helpful but look funny

 

[Iron]

Get some mud flaps.

 

[Apprunner]

Or PPF the back and clean it regularly without worrying about swirls.

 

[Mr. Wonderful]

My corvette is the same way, its just how physics works.

Agreed - my 2004 Z06 would get a lot of dirt at the bottom of the tail lights even on a short drive.
The Y has that small "shelf" at the bottom of rear diffuser which acts like a dustpan.

 

[E90alex]

All of the Tesla models.

Every car ever

 

[tangible1]

So this is a known issue in the Y? How about the other Teslas? Apparently, the Y sucks up dirt like a Hoover in the back. Probably cause of the high rear sill and near vertical vacuum creating the pressure suction.

My other gas cars never seem to get this dirty in the back.

not an issue, just a basic consequence of moving a body thru air.
mixture of tire rubber and dust. NBD

 

[tangible1]

Get some mud flaps.

I have those and they don't make any difference.
but the accumulation isn't a big deal anyway.
every car exhibits this to some degree.

 

[Bikeman]

My Y gets dead bugs up at the front. And it gets dirty in the back faster than the rest of the car too. Then again, every car or van I've ever owned has had the same issues. I think the problem might be that these vehicles move quickly through filthy and buggy environments.

 

[tashtibet]

will this be Wall Street Monday FUD?

 

[Midpack]

All cars do this to some extent (post #2 above), though some cars are worse than others. That's why when you go to a drive thru car wash if there are attendants, they brush the back of the car by hand before you enter the tunnel. Mud flaps and/or spoilers may help, but nothing will eliminate the issue for a vehicle shape prone to it.

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