Car aerodynamics are all about balance. You can either 
set the car to run as fast as possible in a straight 
line, or go for more downforce, which improves grip 
but reduces overall speed. Try to find the right level 
of downforce for the circuit you're racing at next. On 
'power circuits' like Hockenheim go for straight line 
speed, while on winding tracks like Monte Carlo look 
for faster cornering. Also check tyre pressure and wing
balance to avoid steering problems.