K&C Testing Tips

Ride Height and K&C Testing

Ideally, race cars should be setup for a K&C test as if going on-track. That is, setup to the correct ride height, weight, alignment, etc. But sometimes, it isn’t feasible to set everything properly. When that happens, the ride height is the most important thing to set correct. This is because on the K&C rig, the car is clamped or bolted down at a known height. The machine will then return to this ride height all day. And it will do so independent of weight. That doesn’t sound like much of a statement on the surface, but it is exactly the opposite of what happens in real life. On the ground, the car will always weigh the same, but the ride height will vary based on spring pre-load, suspension friction, dampers, etc. This can take some time to get used to. Another oddity related to clamping the car to the K&C center table is that setting corner weights is easier in that setting one corner has little or no influence on the other corners of the car. Again, different than on the ground. So if the car is at the correct height, and clamped to the center table at that height, changes to spring pre-load, push rod length, etc may be done after clamping to achieve the correct corner weights, with no resultant change in height. You are then able to test the car at the correct height and the correct weight.

It’s important to think about ride height and corner weights before your test, and come in with a plan on how you will set and verify ride height and corner weights.

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