Ride Height
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This is one of the simpler adjustments you can make and once you have found an exceptable height, don't 'play' with it unless you have a real problem.
Ride height is the distance between the bottom of your chassis and the ground. It is adjusted by putting small spacers in-between the top of the springs and the end of the shocks, or if you have threaded collars, by rotating these to raise or lower the car as desired. For on-road cars, the approach is simple: go as low as you can. The lower the ride height, the lower the centre of gravity, which generates grip and makes the car more stable.
BUT...
Set it too low and you risk bottoming-out either under accereration, braking or cornering, making the car slide. Set it too high and you will induce grip rolling.

Setting the height:
For smooth tracks sit the car lower, for bumpy tracks raise it slightly to prevent the car bottoming-out on the bumps.

If you want to tune the handling a little, set the front and rear differently . For instance, if you set the front slightly lower than the rear, you will gain grip at the front, to encourage oversteer. Set it lower at the back to get understeer.

One final point, whenever you adjust the ride height, you affect the camber on both the wheels at that end of the car. Similarly, when you adjust the camber you affect the ride height, so when you have finished setting the ride height always re-check the camber.
Recommended ride height: 4.0 - 6.0mm
Recommended maximum variation in height front-to-rear: 2.0mm