Four-Link Conversions
Air Ride's AirBar rear suspension system converts a factory leaf-spring suspension into a four-link. This begs the question: How is a four-link superior to conventional leaf springs? "A leaf spring is asked to perform several functions in the suspension," explains Bret. "In addition to holding the car up, it is expected to control the lateral, front-to-back, and pinion-angle movements of the rear axle. Obviously, trying to optimize all these functions ends up in compromise. By separating the job of suspending the car from the job of holding the axle in the car, we can optimize each job more easily."
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Musclecar Handling
The straight-line machines of the musclecar era had some shortcomings in basic suspension design, and Air Ride works hard to correct these issues using modern technology. Bret says most OEM front suspension systems, especially those in GM vehicles, were designed to tilt the top of the tire outward when compressed. This resulted in understeer when driven to the extreme. "Their thinking was that in a panic situation, most drivers would instinctively go for the brakes, which, in a pushing situation would be the safe and correct action, but this design does not offer optimal handling," explains Bret. "Ideally, the top of the tire should tilt inward when compressed to maintain maximum tire contact when cornering, and we offer a taller spindle for several applications that improves this geometry. Likewise, the large, cushy pivot bushings commonly used in the '60s lead to lots of suspension slop. We use a firmer rubber or polyurethane bushing to maintain suspension integrity."
Drag Racing
For those with eclectic tastes, an unfortunate byproduct of a tight chassis that handles well is compromised grip at the dragstrip. With the extreme adjustability of an air suspension, however, you can have the best of both worlds. "Just like any other form of racing, setting up an air-suspended car for drag racing isn't much different from setting up a traditional suspension," says Bret. "I am not a drag racing expert, but in general, we try to set the car up as loose as possible without getting into wheelhop. Loosen the extension valving on the rear to allow the rear suspension to lift the car and plant its tires. Also, loosen the front extension valving to allow the front end to come up and transfer the weight to the rear while keeping in mind that some cars like a bit more preload in the right rear spring to plant that tire better."