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no, there is no extended high revs either? you floor the car from a predetermined rpm until redline, and then the dyno's break slows the drums and wheels to a stop. actually, it is easier on the car then a full throttle run, because the drums on a dynojet dynamometer only weigh about 2900 pounds together, where as the actual car on the road is pushing near 3300 pounds plus wind resistance. on a mustang type dyno, it is different, as that works on resistance, but they aren't as accurate, and not that many people use them.

Originally posted by IStheBest:
Does extensive dynoing of the car have any negative effects on the engine due to the extended high revs or anything?
Thanks in advance for your responses...
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