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Black dust on rear bumper

Joined
27 June 2021
Messages
132
Location
Canton, OH
Is this normal? (I have a white NSX so it's more visible) Everytime I drive it, I have to wipe this very fine layer of soot off the rear bumper. It's like a very dry powder and comes right off with a microfiber towel. Not a big deal, but hard to keep my a**-end clean
 
although not a new car, old nsx'ers have been dealing with this for ever..it is felt to be a combo of road/tire/exhaust particles attracted with a static charge of the bumper cover...
 
Is this normal? (I have a white NSX so it's more visible) Everytime I drive it, I have to wipe this very fine layer of soot off the rear bumper. It's like a very dry powder and comes right off with a microfiber towel. Not a big deal, but hard to keep my a**-end clean

I have a 2018 Casino White Pearl and find the same exact thing. Black fine dust on the rear and and around the rear vents. Not nearly as bad as my prior NA1 Black car though.
 
The accumulation of dust in the rear bumper is normal for a properly designed vehicle. Properly designed vehicles have zero or negative lift in the rear end, as such there is a low pressure zone that forms behind the rear end of the vehicle.

Watch the following youtube video regarding the NC1's design to help you understand what is happening.

 
although not a new car, old nsx'ers have been dealing with this for ever..it is felt to be a combo of road/tire/exhaust particles attracted with a static charge of the bumper cover...

Blame the golf clubs. Late in the design phase, the Acura marketing people came in and demanded that the trunk hold two golf club bags. This apparently was "critical" for the American customer they were targeting in their brand strategy.

So, they extended the rear of the car about 6 inches, which placed the rear bumper ledge directly in the airflow vortex. Now, we all get to wipe down the bumper after every drive. :mad:
 
Right....if they had just listened to the domestic market they would have only needed to fit ping pong paddles...
 
shades of a TR-7....
 
Right....if they had just listened to the domestic market they would have only needed to fit ping pong paddles...

The Honda "typical" NSX customer was a wealthy European man who used the car for grand touring between his homes on the continent. So, to be an "everyday" supercar, the trunk only needed to hold the weekend bags for that man and his mistress. :D

Not sure it would have looked as good half a foot shorter.

Where is [MENTION=23846]N-spec[/MENTION] when we need him?
 
mistress=lots of baggage...........
 
It is tire dust. Check you have the newer rear toe in alignment spec.
I lived this.


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Any recommendations on the best way to do a quick clean of the bumper? I was using a quick detailer, but it makes a wet/black mess (and uses up a couple MF towels). Thinking of pouring some water over the bumber first, then going over with a quick detailer second.
 
believe it or not try a California duster...
 
believe it or not try a California duster...

Thanks! I wasn't sure as I've heard mixed reviews about them (i.e. scratching paint). I do have PPF on my bumper though so maybe it's a moot point?

Also best place to buy one?
 
believe it or not try a California duster...

This was LarryB's preferred method for the bumper. Mine was the aforementioned microfiber and quick detailer. I didn't have any issues with residue/streaking etc. using the Meguiars Ultimate Quick Detailer.
 
PPF ...have at it with any of the above..thats why you payed the $...
 
Considering how many MF towels I go through to clean this black dust off (and how dirty they get), are they still safe to reuse on car after washing? Or do you pitch them or save them for your wheels and such?
 
Yep the dirtier it gets the better it works....
 
believe it or not try a California duster...

Got my California Duster and Mini Duster today...holy crap!! Literally 5 seconds and the bumper is clean! Thank you for the recommendation!
 
I don't know why its called the Cali duster but...hey it does work...:biggrin:
 
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