Since Ben brought up that the pic existed in the hood thread, I had to find it. Granted it is for a NB and there is no designation about what speed it was tested at, it at least gives us some insight into airflow. I figured that I'd post it here for reference.

 

Sorry, I knew it was of the NB, and should have mentioned that. NA and NB are close enough I think for this purpose though.

 

it appears that the first half of the hood sees the biggest pressure therefore being the best place for an opening
or am i completely wrong?

 

Actually, I should have been more clear in my description. The diagram shows air velocity not pressure. So red would be higher velocity airflow and green/blue lower velocity airflow. Which is why in theory placing a vent toward the front of the hood "should" be a good location for an extraction vent as typically higher velocity should mean lower pressure and why the back of the hood "should" be a good location for a cowl intake as it is a low velocity/higher pressure area. As another example, note the nice low flow/pressure area right where a windblocker usually makes a difference. BUT, again, this can change based on airspeed and the pic did not have any indication of airspeed.

 

So does this mean I can drive in the rain with the top down and not get wet?

 

I wonder how much of a difference a hardtop makes?

Also it seems that you would need a pretty tall rear wing in order for it to see any "clean" airflow.

 

Do you have a version of this with the top up?

 

driving in the rain with the top down at 65mph results in very little wetness..... maybe a few drops...

 

gotcha, we are on the same page

 

Needs more NA w/ hardtop.

-Mike

 

This might not have anything to do with actual aerodynamics, but I'm trying to talk autokonexion into making NA mazdaspeed Type II side skirt replicas. They look so hawt.

 

pic?

 

Go the m.net and look in the dyno section for the 28rs dyno on a 1.8. The guys 2nd post has a pic of his red car with them. They are one of the only oem side skirts made for the NA. I don't think they were ever released in the US though, and have been discontinued for a while. Only good looking skirts IMO.

 

haha does anyone have the legend for this?

(this picture is in a (my) fluid mechanics text book, and never had any legends that i could find)

 

red = fast, blue = slow. Things like this just follow the order of colors.

 

Sorry no hardtop version and no legend. I am sure that the colors indicate airspeed and not pressure as the original file was named wind velocity or something of that sort. No other versions. It was a file that RodH found on some site in the UK with no other leads.

 

wow, helpful.

Red=100000000 mph
Blue= absolute 0

 

Again, sorry, no legend. There wasn't even an annotation of what windspeed the test was done at. FWIW, this is pretty much what we have unless anyone has access to a windtunnel.

 

On no brgracer, i appreciate the effort to get he picture an everything, that was for neo, for his explanation

 

Here you go Ben