NHRA Announces Changes to Class Guide

Dwight Southerland · 09-14-2011, 04:27 PM

Driver weight is never considered in calculation for class. It is only added to the classification weight for weight at the scales. The minimum vehicle weight to run AA/S with a power factor of 476 is 476 x 7.5 = 3570. The 170 lb allowance for the driver weight is added to that to determine a scale weight : 3570 + 170 = 3750 That number would be placed on the side window for the people at the scale to reference.

If you want to calculate the maximum horsepower in question for the 2008 CJ, use the shipping weight of 3240 and add 500 to it (the maximum allowable ballast). That total is 3740. Then divide by the AA/S 7.5 weight break (3740 / 7.5). The answer is 498.67. That causes me to question NHRA's decision and calculations.

491 x 7.5 = 3682.5 3683 - 500 = 3183

Their claim of 610 lbs. means 3240 + 610 = 3850. I don't know where they get that.

09-14-2011, 04:27 PM	#7
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,001 Likes: 64 Liked 778 Times in 193 Posts	Re: NHRA Announces Changes to Class Guide Driver weight is never considered in calculation for class. It is only added to the classification weight for weight at the scales. The minimum vehicle weight to run AA/S with a power factor of 476 is 476 x 7.5 = 3570. The 170 lb allowance for the driver weight is added to that to determine a scale weight : 3570 + 170 = 3750 That number would be placed on the side window for the people at the scale to reference. If you want to calculate the maximum horsepower in question for the 2008 CJ, use the shipping weight of 3240 and add 500 to it (the maximum allowable ballast). That total is 3740. Then divide by the AA/S 7.5 weight break (3740 / 7.5). The answer is 498.67. That causes me to question NHRA's decision and calculations. 491 x 7.5 = 3682.5 3683 - 500 = 3183 Their claim of 610 lbs. means 3240 + 610 = 3850. I don't know where they get that.