Spring Rate Calculations

When calculating your dual spring rates we request you complete the following steps with your existing setup and supply the information gathered in this process:-

NB The Driver and Co-driver should be in the vehicle when taking these measurements and the vehicle should be as close to "ready to race" condition as possible.

Step 1 - Fill in your Name, Phone and Email address in the boxes below.

Step 2 - Record the Shock Absorber Type and Shock Absorber Travel in the boxes provided.

Step 3 - Adjust the spring pre-load rings until your car sits at the ride height you want. This step is very important, even if the springs are loose when the suspension is fully extended.

Step 4 - Make sure the crossover ring (if you have one) is not pressing against the spring divider (the plastic part between the springs). This can confuse how much preload is required to reach the correct ride height.

Step 5 - Measure how long each spring is when your car is at the ride height you want - (Called Nominal length). Write these down.

Step 6 - Lift your car until the wheels are off the ground and the suspension is fully extended. Measure the length of each spring again while preloaded and write these down too. If there's a gap between the top of the spring and the preload ring, divide it by two and add half to the lower springs and half to the upper ones. This is the Installed Length.

Step 7 - Remove the springs from the shocks and write down the spring rate and how long they are this is the Free Length.

Step 8 - Spring Envelope: This is the longest possible spring that could fit. Wind the preload ring (top spring platform) all the way off and measure from the bottom side of the preload ring to the top of the lower spring platform. Record this measurement.

Step 9 - Thread Envelope: Measure the total length of the thread on the shock absorber.

Step 10 - Fill in all the boxes below.

Step 11 - Hit Send button.