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In theory lowering your car may affect wet-weather grip, but there are lots of other factors involved (tyres, tyre pressures, srings, dampers, anti-roll bars etc.).
One reason why race cars are set up softer in the wet than the dry is to do with weight transfer. For instance, on a right-hand corner you would want most of your weight over the l/h front wheel (this why you see kart racers trying to headbutt their front wheels in the wet).
By lowering your car you are lowering its centre of gravity, thereby reducing weight transfer.
However, on a FWD car this may actually help traction (less transfer to the rear).
Having said all that (and its not a very clear explanation) I would have thought you would have to lower the car by a lot to make a noticeable difference on the road.
Not strictly true. Lowering the car should give you more grip in the wet!! This is due to the ventura effect, as used on most racing cars. The high pressure/low pressure differential increases and hence so does the amount of downforce and mechanical grip.
Obviously this depends on a lot of different factors so Im not sure it would apply to a normal road going car. The major factor is tyre contact with the road.
its not so much the height of the car, but the settings your running.
in the wet, i rnu the rear track narrower than the fronts, this helps heep weight over the front wheels as your altering the pivoting point and the polar moment of inertia.
in the wet, the key to fast progress is SMOOTH!!! on everything. smooth on the throttle, brakes and steering. having asoft setup stops the car taranferring weight as quicky as it would with hard dampin/compression and spring rates. ARBs are often taken off sot he car can roll and generally slow the speed of weight transfer. This helps by not unsettling the car and loading any one tyre by a huge amount. You will never lift a rar wheel in the wet unless you have some amazing tyre that works like velcro!!
there is no one defining setting, it all depends on driver skill/style and enviromental factors.