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Modern race cars that utilize coil-over shocks are pretty sophisticated machines. Understanding how to make all the systems work together is often the difference between victory lane and just another night at the race track.

Modern race cars that utilize coil-over shocks are pretty sophisticated machines. Understanding how to make all the systems work together is often the difference between victory lane and just another night at the race track.

OneDirt takes a look at Intercomp Racing’s new Coil-Over Spring Rater to see how it can give you an advantage on the competition

The average racer can make most of the necessary measurements on their race car and compare them against numbers their chassis builder or a trusted racing veteran. But the savviest racers (and the ones that do the most winning) understand how all the moving pieces on the chassis work together as a whole.

For example, it’s pretty common to be able to check camber, and even camber gain as the suspension moves the wheel through its travel. But being able to account for how sidewall flex in the tire will be affected by those settings is a much rarer ability and can help you make the right setup adjustments at the track without having to resort to trial-and-error.

That seems to be the thinking behind Intercomp Racing’s new Coil-Over Spring Tester and Compressor. The company calls it one of the most versatile chassis setup tools you can use. That’s because it can do the task of evaluating several suspension components as a system.

For example, you can check your suspension springs in a spring rater. And you can compare the durometer ratings of your bump stops. But understanding how your car will react when they are activated at the same time is a different story. That, however, is exactly what this new tool from Intercomp Racing can do–and more.

The Coil-Over Spring Tester allows you to sets a complete coil-over shock and spring setup. This includes bump stops, coil bind, and even the rod pressure provided by the shock itself. This is valuable so you can change any combination of shock, spring and bump stop and bolt it all up without throwing off your ride heights.

Finally, on top of that, Intercomp says this tool is also valuable for making heim joint center-to-center measurements which can be used to help you maintain corner weights while making spring changes.

Here’s a look at how it works.

The first step when using the Coil-Over Spring Tester is to scale the vehicle just as it would be raced. With the vehicle at race-ready ride height, measure the length of your shocks from the center of each heim joint. Make sure your suspension is settled and free of bind. Document the lengths for future reference.

The first step when using the Coil-Over Spring Tester is to scale the vehicle just as it would be raced. With the vehicle at race-ready ride height, measure the length of your shocks from the center of each heim joint. Make sure your suspension is settled and free of bind. Document the lengths for future reference.

Elevate and properly support the vehicle. Remove the coil-over assemblies and measure the center-to-center “free height” of your shocks from the center of the heim joints. Record these numbers as well.

Elevate and properly support the vehicle. Remove the coil-over assemblies and measure the center-to-center “free height” of your shocks from the center of the heim joints. Record these numbers as well.

 

Once you have this information, you can load the entire coil-over assembly into the Coil-Over Spring Tester and Compressor.

Once you have this information, you can load the entire coil-over assembly into the Coil-Over Spring Tester and Compressor.

Zero both the travel indicator (A) and the load indicator (B) on the device.

Zero both the travel indicator (A) and the load indicator (B) on the device.

Measure from the flat spots on the mounting pins to determine the current center-to-center length of the shock in the Coil-Over Rater matches the free height measurement that you already recorded.

Measure from the flat spots on the mounting pins to determine the current center-to-center length of the shock in the Coil-Over Rater matches the free height measurement that you already recorded.

Compress the assembly until the center-to-center length of the shock is the same as it was installed on the vehicle at race-ready ride height. Record the value noted on the weight indicator.

Compress the assembly until the center-to-center length of the shock is the same as it was installed on the vehicle at race-ready ride height. Record the value noted on the weight indicator.

Now that we have this value and length, we can use these reference numbers to install any spring combination on that corner to maintain wheel load rates and ride heights. If you are changing to a softer spring, you will have to add preload to get the same target load number--which will give you the same ride height. Likewise, you will need to reduce preload when switching to a harder spring.

Now that we have this value and length, we can use these reference numbers to install any spring combination on that corner to maintain wheel load rates and ride heights. If you are changing to a softer spring, you will have to add preload to get the same target load number–which will give you the same ride height. Likewise, you will need to reduce preload when switching to a harder spring.

 

Source

Intercomp Racing / 763.467.2531 / IntercompRacing.com

 


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