Not so much "incorrect" as not accurate enough.
We are only talking of grammes of aerodynamic forces acting on the bodies of these cars.
The difference between positive and negative lift can be as little as 4 - 5 grammes !!
Before with the Mazda 6 and Stratus 3.1 bodies I origially tested I could not
get accurate enough data to confirm actual down force or not.
Thats now changed!
With the rolling road I will also be able to get 'Airdam' effect on the cars..... ground effect.
Just to give a little insight into what real effect this can have even on our cars.
Putting on the Stratus 3.1.
Chassis ground clearence----5mm
Car in race trim with 50% fuel load.
35mph road speed with corresponding wind velocity.
Front of body was placed firstly at chassis ground clearence, then placed with front airdamas close to rolling road as possible without interference.
The front C-l went from +0.5 to -0.8 !!!
This equates to actual downforce generation!
Now get this.............. with body clips removed and everything else unchanged, C-l changed to +0.75 and -0.25 in the same test !!
I know, I'm a little bit of a geek, but if you don't want these results just say.