splotchy pressure representation on surface of a car
 

Hi

I've a newbie here, and i've take the motorBike tutorial and swapped out the geometry for an STL file. I've increased the block mesh size to 175/50/50 however have left all of the snappyhexmesh settings alone, except for changing patch names. After 600 iterations of simplefoam, i get a splotchy looking surface representation of pressure. I'm hoping someone can point me in the right direction- is this an issue with blockmesh, snappyhex mesh settings, or geo cleanup, or more iterations?

thanks for any advice..

https://drive.google.com/open?id=1e2...lLWobk2czEt5JP

https://drive.google.com/open?id=12H...bQD7z0WDbVw2eI