It's always best to test the car both with driver weight in and out to get a sense of how that weight change affects the car. It's always best to test the car both with driver weight in and out to get a sense of how Scaling a Street/Strip Car Once we developed a system to generate repeatable numbers, we decided to test our Orange Peel Chevelle. We unhooked the front sway bar and installed our 26-inch-tall M/T ET Street dragstrip tires with 18 psi of pressure. We filled the gas tank and rolled the car on the scales. The Orange Peel has grown portly since our story on reducing weight ("Trim The Fat" Nov. '09), including the swap of the iron-block Lester Scruggs 404ci motor, a complete Weldon fuel delivery system, a 3-inch Flowmaster exhaust, a front sway bar, and a copper/brass radiator to combat a nagging electrolysis issue. Here's how it shakes out with the driver in the car: TEST ONE LF RF Total: 3,472 pounds 1,024 894 Front: 1,918 pounds—55.2% (29.5%) (25.7%) Rear: 1,554 pounds—44.8% Left side: 1,795 pounds—51.7% LR RR Right side: 1,677 pounds—48.3% 771 783 (22.2%) (22.6%) We were a little surprised at how much weight the Chevelle had gained at 3,472 pounds. Do they make lap bands for Chevelles? Driver weight contributes 193 pounds to the car, making it 3,279 without driver. If we put staffer McGann in the car, we can trim 63 pounds right there! We elected to retain the battery in its right-front location, but for fun we moved the 41-pound Optima RedTop to the right rear to evaluate the change: TEST TWO LF RF Total: 3,471 pounds 988 868 Front: 1,856 pounds—53.5% (-62 pounds) (28.5%) (25.0%) Rear: 1,615 pounds—46.5% (+ 61 pounds - 1.7%) Left side: 1,790 pounds—(-5 pounds) LR RR Right side: 1,681 pounds—(+4 pounds) 802 813 (23.1%) (23.4%) Moving the battery to the trunk is the classic way to redistribute weight to the rear. Consider that to run at your local dragstrip, safety rules require a remote battery shutoff switch located at the rear of the car. Moving the battery to the trunk is the classic way to redistribute weight to the rear. Con As you can see, we lost a pound somewhere, but moving that heavy battery more than 11 feet to the back in the car had a serious effect on weight distribution of 1.75 percent or 61 pounds, which is nearly 50 percent more than the weight of the battery because we moved it farther behind the rear axle than it was ahead of the front axle. The right rear gained 30 pounds, with the left rear adding the other 31. Frankly, we expected more of a change on the right rear. We also thought it would be interesting to test how ballast altered the weight distribution. First we added 45 pounds directly over the center of the rear axle. We then moved that weight 34 inches behind the rear axle and 24 inches to the left of center. Then we placed the weight in the opposite far right-rear corner and recorded the following results: « | 1 | 2 | 3 | 4 | 5 | » | View Full Article By Jeff Smith Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!