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autocross

Tech Talk: Anti-Dive & Roll Center

ANTI-DIVE: So with tech topic about instant center and anti-squat we have the reverse to consider. The same geometry that affects acceleration, also goes into deceleration (braking). The exact opposite reaction will happen during braking. If your instant center is on the anti-squat line the car should remain relatively flat during braking. If you move forward or aft of that line, then body movement will start to happen which may or may not be ideal. As with everything in the suspension world a balance is needed. The suspension that has the right balance for the conditions will always be more…

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Tech Talk: Instant Center

A common term thrown around in the suspension and chassis world is instant center. What the heck is it and what does it mean? Instant center is located by drawing an imaginary line through the upper suspension links to where it intersects with a similar imaginary line drawn through the lower links. Think of instant center as the pivot or hinge point of the suspension at a specific given ride height. If you were to replace all the arms (say a front suspension), or all the links (in say a 4 link rear) with 1 big arm, where would that…

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Tech Talk: Springs

So now that you’ve read our tech talk on selecting a shock, you now need to match the correct springs to them for the type of driving you will be doing (daily driven road or track use). First thing you will want to know is how much does each corner of the vehicle weigh. Lets say a GMC typhoon weighs 4k lbs without a driver. On the scales we see 1200lbs on each front corner, and 800 on each rear corner. (example weights only) Clearly the front will require a higher spring rate than the rear. Springs are typically rated…

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Tech Talk: Shocks

One of the first changes most people do or think about with any vehicle suspension is the shocks. Shocks are obviously very important to the whole suspension system. When moving toward performance oriented shocks the most often talked about tend to be aftermarket adjustable versions. Many manufactures offer many solutions. From a physics side of things they all work very similar. Multiple cavities exist within the shock in which fluid is filled, and sometimes charged with gas (typically just a plastic bag not much different than packaging air bags). As the shock travels, fluid flows from one cavity to the…

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