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[Andrew Hill]

Originally Posted by mopar jeff

So if my combo has a factor of 15.01, then I would have to add 15.01 pounds for every horsepower they assess?

No, 15.01 is the factor that determines what class your car falls in. Say the rated horsepower was 250 and the shipping weight was 3753, this would give a factor of 15.01. O/SA is the natural class for car with factors of 15.00-15.99. This means that you could in N/SA, O/SA, or P/SA at their appropriate weight breaks. This car would have to weigh (15x250) + 170= 3920 lbs in O/SA. If the horsepower rating were changed to 255, the factor would be 3753 (shipping weight) divided by 255 (the new horsepower rating) which is 14.72. This would make it a natural N/SA car and it could run M/SA through O/SA at the appropriate weights.