HOW TO'S WHAT IF'S
What you need to know to get the max from our products
Sway-A-Way has greatly expanded the Tech Room. Customers can find updated technical and application information here on our complete line of Sway-A-Way Suspension Components and accessories.
ON LINE CALCULATORS are available to calculate spring rates, wheel rates, dual spring rates, torsion bar rates and more for a variety of different suspension designs. The nature of suspension products lends them to many varied applications of one part number. Proper selection, use, installation, and maintenance may require prior suspension knowledge and familiarity with your particular performance requirements. Feel free to utilize the tools in this Tech Room and/or our experienced staff to assure the best selection and use of Sway-A-Way products.
Tool One: SUSPENSION WORKSHEET with ON LINE CALCULATORS
Tool Two: INSTALL INSTRUCTIONS
Tool Three: DIAGRAMS
Tool Four: VW GUIDES
Tool Five: ARTICLES on Technical Topics
• Off-Road Race Shock Revalve How-To
• Axle Length Measurement Instructions
Unsprung Corner Weight is the part of the vehicle weight that moves with the wheel. It is best to minimize unsprung corner weight.
Unsprung weight is the weight of the wheel, hub, upright, brakes and plus about one half the weight of the shock/spring and A-arm/I-beam assembly. For most of the rear suspensions of trucks, the unsprung weight is the tires, wheels, brakes and the whole rear end and about half the weight of the shock/spring and trailing arm.
To get this value from an existing vehicle:
Support the vehicle weight with a lift or a jack so that the vehicle is not suspended on the suspension system.
Remove shock, spring and swaybar (if any).
Make sure the vehicle is at ride height.
Place the scales (weight scales) under each tire and record the value as Corner Unsprung Weight.
Sprung Corner Weight is the part of the vehicle weight that is sitting on the suspension springs. You can also estimate this as the total vehicle corner weight minus the unsprung corner weight. Please note that the Sprung Weight is not the same as corner weight because the corner weight includes the Unsprung Corner weight.
Wheel Rate is the effective spring rate at the wheel. It is also the amount of weight (lbs) it takes to lower the vehicle one inch (per corner). You can also see it as change in the load on wheel as the wheel travels vertically.
In order to determine wheel rate, you must know the vehicles Sprung Weight, and the wheel travel.
For example if your corner wheel rate is 200 lb/in then loading 200 lb weight on that corner will lower that corner one inch. This value is very important since it tells how much the vehicle corner sprung weight will lower the vehicle with a given wheel rate, which in the end determines your ride height.
Spring Rate is the change in spring load as the spring compresses/twists. The spring rate is chosen to achieve the wheel rate desired.
Spring rate is equal to the wheel rate divided twice by the motion ratio.
Spring Rate can be calculated using the Tech Room Main Calculator.
To get this value from an existing vehicle spring either test the spring with proper equipment or measure the physical dimensions of the coil spring and enter them to Tech Room Spring Rate Calculator.