Droop is the upward and downward travel limit of the suspension. In some contexts it can be referred to as uptravel, or downtravel. Not to be confused with upstop however. Upstop is only a physical addition to the suspension that only serves the purpose of limiting the uptravel to an extent which the suspension itself cannot.
Droop is directly affected by chassis ride height. When the car is raised off the ground (higher ride height), the droop is reduced. Traditionally there should be a compensation made in the droop setting when big changes to the ride height are made.
Droop is a crucial setting parameter of a touring car as it adjusts the weight transfer of the chassis. More droop allows for more weight transfer from side to side when cornering. Typically, more droop is more suited for low grip conditions. You can change the balance of the car very quickly this way. For example, less droop in front will increase on-power steering as less weight is transferred towards the rear when on-power. This is better suited for smooth, high speed tracks.
More front droop: More weight will be transferred from the front to the back on-power. The high speed steering is decreased. The car will be more stable when the throttle is in the neutral position.
Rear droop: Less rear droop: The rear will stay more flat off-throttle and when brakes are applied. The braking stability is thus increased. If the rear end tends to step out (loose) when entering the corner off-power, the rear droop should be decreased.
More rear droop: The rear will travel more upward off-throttle or under braking. More weight will thus be transferred to the front wheels at that part of the corner which allows for more turn-in. Most noticeable in slow corners. If your car has off-power push, an increase in rear droop will help the car to turn.
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