How wet is a huge variable. I've been on tracks that where the variation was more than 4 seconds between wet and very wet. Close to 10 seconds on pretty dry vs. very wet.
Aside from all of the other variables mentioned already there's the topography of the track too. Does it puddle? Where? are there areas where water is running accross the track? Where? How rubbered in was the track before it got wet?
Long story short, there's absoluetely no way to even close to accurately guess a dry lap time by looking at a wet one.
|