Originally Posted by VFX
Look at these 2 images.
The Toyota F109 design allows more air to travel further along the taller central diffuser allowing for more aero manipulation giving more downforce.
The McLaren MP4-20 diffuser cuts short the volume or air that is effected by the central diffuser compared to the Toyota design & what air mass is there doesn't have the same level of manipulation giving less downforce in comparison.
The Brawn diffuser seems even more efficient than the Toyota & the Ferrari diffuser is similar to McLarens.
Hope that helps.
Thank you for the response. But I could not see the images so I did some digging and think I have a grasp on the difference!
Kind of funny on a side note Hamilton & Kovalainen fastest in first practice with interim diffusers. How long will Brawn's reign last once the others convert and catch up.