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Originally Posted by 328FTW
Only instantaneously on takeoff and its so small a difference as to be not noticable, what is noticable however is the jerking on the drivetrain and engine vibrations. Drag cars do it because they use the engine to brace the chassis somewhat and they are certainly not worried about vibrations so do whats easiest and wont tear (steel).
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Racecars use solid metal mounts because you get the most feedback from the road and less flex, meaning better wheel contact.
Also, in some racecars (i.e. Formula 1) the engine isn't used to brace the chassis technically, it actually IS a part of the chassis. In an F1 car, the engine connects to the carbon fiber front end and essentially is the rear end. It's called a stressed member when the engine and/or transmission is used as a load-bearing member in the chassis.