The flywheel basically "stores" energy. Since the steel one is heavier, it carries more momentum. It gets the car moving easier and "hits" the tires harder on the drag strip. I don't really like the way it acts on the street. I don't really know how to describe it, it's just different.
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1998 Mustang GT Coupe - World's Slowest Racecar
2005 Toyota 4Runner SR5 V8
2013 Volkswagen Jetta Sportwagen TDI
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