Surely double clutching upwards is a lot slower than normal gear changing. Why do racers do this?
by 
TomRacing
ANSWERS: 2
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First let me say that this is a very poorly worded question. If I understand you correctly, then yes double clutching is slower. It is basically unnecessary nowadays thanks to synchronizers in the transmission that bring the gears to the same speed during shifting. In a race they do not double clutch. I really do not get what your question really is. If you could clarify it then maybe you could get a better answer.
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Speed is of course relative. A racing driver will be able to double clutch faster than most people can perform a normal "Granny Shift" change. A double clutch change will also give the maximum torque straight after the change without having to wait for the gears to synchronisers. The final point is that very high performance gearboxes don't have synchronisers because they reduce shaft horsepower at the drive wheels. Synchronisers are in effect tiny clutches and therefore they limit the torque than can be put through the gearbox during the change. I hope this helps...
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