The teams head to Barcelona this week for a test session ahead of next weekend's Spanish GP.
Mclaren will be hoping to find extra speed and BMW plans to build on the momentum that its car has shown in the first three races of the year.
Lewis hamilton and Heikki Hovalainen will both be on hand to test new parts and set ups.
Interestingly, Hamilton received a glowing endorsement from Kimi Raikkonen after his last race. The Ferrari Finn said: "Maybe it makes it more difficult when you do not have such a good package and you try to push more and more - especially during a race when your weekend has not been as good."
That's nice, but I reckon Lewis would rather he he could wipe the smile off Kimi's face at the very next race.
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