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We do not make the control arm longer, we make a ball joint that has a longer pin. It is a mono ball with adjustable length. Another way to describe the ball joint is to say the shaft the goes through the steering knuckle is longer. In effect it make the steering knuckle longer. My discriptive powers seem weak today. go to http://www.colemanracing.com and search for mono ball or ball joints. Let us revisit this after you have looked at the mono ball.
Rear roll center. For you use on a road racing a panhard bar that is parrallel to the ground at ride height is technically correct. Were the panbar passes the center line of the car normally determines the rear roll center. Lowering the bar on either or both ends will lower the roll center. A lower rear roll center will transfer the weight quicker on the outside rear tire make the car take a quicker set. Most of what you rear about roll centers is for car with much different dynamics. The science is the same we are just using it differently. A case in point. Most roll centers are at center line of the rear axle because the rear axle is also the drive axle. On a rear drive car when you acclerate the feature of anti squat cones into play appling large amounts of downward force on the rear tires. Front wheel drive does not do this. So we use the roll couple to apply that force.
The rear axle stiffner is fairly simple and allows camber to ge adjust at any time at the track. On the top center of the rear axle we weld a peice of 3/8 plate, with two 3/8 holes. Next we weld a peice of 3/8 plater to the axle uprights just below the upper trailing are mount bolt. Between the center of the axle and each upright we install a tube with a trunion on each end. One trunion is right hand thread the other is left hand thread. To decamber the rear axle say on the right we make the tube shorter by turning the tube. Same on the other side. We have found that we need less negative camber than before because the axle no longer flexs. On circle track racing we have generated enough side force in the turn to bend a stock panhard rod.
Tire width verys by what class or activitly we are running. For our last road race work we used 205/50/15 on 7" wide wheels. For circle track we normally are required by rules to use a 13" wheel with a 7" wide spec tire.
We have used 225/50/15 on circle track. For some one who does not have a 1000 laps a 205/?/? tire is the best to learn on. It will teach you to expect beakaway at a lower speed. The wider the tire the more correct the supension must be to get the most out of them.
I wish you were close by we could show you more of what is needed with a hands on approach.
Brad
posted by 24.121....
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