An overall stiffer car will have more grip on smooth surfaces because it will roll less.
It will lose grip on uneven surfaces.
On gravel and mud surfaces a softer suspension is used.
Softer suspension also allows the vehicle to gain better grip on the loose surfaces.
Altering the spring rate affects the pitch of the vehicle also.
A softer spring rate will let the vehicle pitch forward under braking and back under acceleration.
Ride height is of great importance in off road racing.
This will allow the vehicle to handle uneven road surfaces at speed and manage jumps better.
Really this setting and suspension stiffness go hand-in-hand.
Summary: for smooth surfaces (tarmac for example) you should choose harder suspension and low ride height.
For loose surfaces (mud, sand): softer suspension and high ride height.
Check your car’s drive train to better match the distribution of braking force.
Differentials
Central diff
In other words - the drive balance (also known as drive bias).
Limited Slip Diffs
Adjustments to the limited slip differentials will dramatically affect the vehicle’s handling characteristics.
In four wheel drive vehicles it’s possible for you to adjust the front and rear differentials independently.
By increasing the strength of the differential under acceleration, the traction will be increased when exiting corners.
This is because the differential will prevent the inside wheel from spinning.
Downforce
This determines how the air flows around the running vehicle.
High downforce parameters will push the vehicle down onto the road at high speeds.
It’s proper to increase the downforce on tight and twisty tracks.
Similarly to the long gearing, also low downforce proves correct on tracks with long straights.
Similarly, powerful rear-wheel drive cars tend to run with a stiff front ARB and soft at the rear.
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