Every kart and every driver respond differently to different conditions. If your driver drove exactly like another driver, then he could probably use the same set up but might not feel comfortable doing so.
Start off with tyre pressures. Particularly in the rain, tyre pressure is crucial. A tiny variation in tyre pressure can make the difference between complete confidence and hanging on by your fingernails. If it's cold and wet, then you are going to have to make the tyres work hard with a loose kart in order to get any chemical grip. If it's hotter and drying, then you have to worry about overheating the tyre.
A loose kart will recover better from 'out of control' situations. The faster one drives, in the wet, the more out of controls one sees because the track is not as predictable. So a quicker recovery often saves more time than a quicker kart with a more 'accurate, tighter' setup.
The ultimate driving aid in the wet is knowing the track surface. Knowing that going into this corner is safe because out there there's a tiny ridge (8 inches long, one chipping high) in the tarmac that will 'catch' you, but you have to make sure you find that ridge when you cannot even see your foot pedals. It often means riding blind, sideways and putting your foot down on faith.
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