Red Bull launched another new version of the diffuser at Valencia which featured an arched roof compared to the previous flat one . This change came to complete the Canadian spec and was possibly triggered by the revised EBD already raced since Canada .
In an attempt to reduce further the unwanted turbulence created by the rear wheel rotation Red Bull revised the diffuser outer tabs making them having pointed edges .
RB6 had new exhaust outlets and vented rear floor at Catalunya , changes that affect a lot how diffuser is functioning and so Red Bull had to revise also the diffuser itself . The new structure had a more boxy shape to the central zone and a reduced opening between the wall and the rear structure to cope better with the changes made .
A heavily revised diffuser was presented by Red Bull at last winter test at Barcelona , a structure retained for Bahrain . The new diffuser had enlarged double deck tunnels and the rear crash structure separated from the main section . The changes were made to increase the quantity of air passing from the double deck to increase diffuser’s sunction effect boosting downforce production . Finally there is a clever small duct at the side of the double deck wall to permit hot exhaust gases from the very low positioned exhaust pipe outlet to enter the second diffuser’s deck , energizing the airflow and boosting its performance further .
RB6 has a very low rear zone due to its pull rod rear suspension and a double deck diffuser . There are four large vertical fences (splitters) in total that divide the diffuser into a central section and four smaller tunnel sections . The venturi channels spotted on the outer diffuser section aim to increase the speed of air passing close to the wheels in an attempt to reduce turbulence created by wheel’s rotation .
Diffuser’s main function is to accelerate the airflow passing under the car body by pulling it, creating low pressure under the car and thus large amounts of downforce with minimum drag penalty . It is not easy for a team to copy a succesful rival team diffuser design as each design feats only to that car and its special characteristics . A brutal copy of the diffuser would probably make the car even slower ! However spying others can inspire mechanics to explore new concepts and structures .
Red Bull followed the 2010 trend for vented rear floor , pioneered by Mc Laren , and presented its own version at Spain among other chnages also launched at Spain . This vent boosts downforce production by feeding with air the diffuser side sections .