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Yes, you're right. I guess I should have clarified my earlier statement. I was assuming that we were talking about intake systems. In the case of lightweight pulleys, or anything else that affects weight, you CAN have a quicker acceleration rate without any additional horsepower. Since force(horsepower) equals mass times acceleration, if you reduce the mass(either the reciprocating weight of the motor, or the total weight of the car) you can have a larger acceleration number, but with a smaller mass the force can come up to be the same. Very simplified, and using random numbers:
F=M x A
15=5 x 3 if the weight is 5 and the acceleration rate is 3
Now drop the weight to 3, and you can have a quicker acceleration rate 5 with the same amount of force, 15.
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