Jenson Button suspects that the new regulations that come into effect in 2014 will make next year's cars difficult to drive.
The V6 engines that will be used next year is expected to produce considerably more torque, but because they are also be fitted with lower rev limiters, the chances of wheelspin is increased.
Although Button has already driven the new McLaren in a simulator, the former World Champion believes the effect the higher torque will have on the cars will only become apparent during the first official testing session at Jerez in January.
"It's about getting an understanding of the power unit and how we are going to put the power down, because it's not going to be easy....
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