The principal regulation change in 2006 has been the introduction of the 2.4l V8 instead of the 3.0l V10 engines. This has caused a loss of power of about 200hp, so to compensate it the teams have tried to improve aerodynamic efficiency by reducing the drag. That’s the main reason why the new back-end and engine cover has being reduced to its limits.
The explanation of these and the other improvements on the new car can be read on very interesting articles you can find on these links:
Link1: http://www.formula1.com/insight/technical_analysis/team/2006/7/230.html
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