[ACEL]

After a 2nd dust test, not using water this time, some separation lines appeared.

Some separation edges were fabricated and tested in a 3rd dust test (see pics).

3 firsts pics: On the driver side, there is dust accumulating on the side of the bumper cover behind the rear wheel: this suggests that the air flow is already detached so the dust can stick. There is also some but less dust deposition on the metal panel above the driver side leg of the bumper cover. The wheel and/or the well need some treatment!
Also there is more dust on the side leg of the bumper cover behind the "separation edge" than immediately after.

4th and 5th pics : show dust deposited on the upper flat surface of the bumper cover. Note that there is less deposition near the separation edges: also, these area are right above the rear wheels "boat tails" which deflect some air coming from the wheel directed to the middle under the car.

6th pic shows some dust deposition on the C pillar resulting from a separation around the rear door window.

7th pic shows the passenger side separating edges and some dust deposition.

Did I get these separation edges right? Is the analysis correct?

All comments and questions are welcome. I want to do those separation edges right.

Real

3rd Test: Separation edges V.02

Separation edges location from the side panel above the tail light and on the tail light seem right: little dust deposition before the edges and no dust deposition after the edges.

Looking at the bumper cover dust deposition on the V.01 separation edges got me thinking. If dust deposits before the trialed separation edge, the edge is either forming a ridge that creates a “no flow zone” or is located too far back and flow separates before to get to the “edge”.

Then, I removed the bumper cover questionable edges and as I had to drive for errands, decided to look at the dust deposits remaining after to locate the V.02 separation edges.

From the remaining dust deposit, the bumper cover separation edges were relocated and some fabric tape was added to make a gradual transition of the flow from the side panel to the edge.

There is a few dry days to wait after some heavy rainy days to get the dust moving again to test this V.02 mod.