THE SHOP

Performance & Hotrod Business - July '15

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July 2015 n Performance & Hotrod Business n 35 that are using rack and pinion, the link- age is not adjustable (other than standard alignment). But once you get into racing, every- thing is adjustable. In a pure drag race application the parts are generally light- weight. The steering geometry is not as critical. (You're supposed to be going straight, right?) So Ackermann and cam- ber are not as important as caster and toe. Generally you would run zero camber and 7-9 degrees or more of caster for higher- speed cars, and zero to 1/16 total toe. PHB: What advice can you give about the selection and installation of steer- ing components for a new front sus- pension project? It is really specific to the type of car you're building and the requirements—as well as your budget. A rebuilt Fox body rack from a parts house might be $89; a race-specific rack might cost over $2,000. The best advice I can give would be to search out the different options, know what you need, and call the respective manufacturers to narrow down what you will need to put a system together. And, try to buy a complete "system" from one manufacturer if possible. Then if it all isn't perfect, you have one source to go back to for help and support. Kellie Colf SpeedDirect, Santo, Texas www.speeddirect.com PHB: What should shops consider when selecting a steering system for their customer's project vehicle? The first thing to consider is the vehi- cle's intended use. But whether it's perfor- Speedtech's new ExtReme chassis front suspension is used in its new chassis and sub- frames. The spin- dle is a Speedtech Exclusive 7075 forging that uses Corvette c7 hubs and brakes. (Courtesy Speedtech Performance) The slugs in the inner LCA mounting location are designed to adjust roll center height and camber curve. The shims under the rack & pinion are to adjust bump steer. (Courtesy Ron Sutton Race Technology) Another view of the inner tie rod adjustment used to adjust bump steer. It gives the option to lower the rack for a lower engine, which equals a lower center of gravity, without sacrificing bump steer. This is the system that will be used on the Speedtech ExtReme chassis that are set up for autocross and road racing. These are just a few examples of where adjustments can be built into a chassis. (Courtesy Ron Sutton Race Technology)

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