Thank you all for the replies. I’ve wondered why so many situp high drivers.
The lay down seat should in all sprint karting classes be faster. It’s because the lay down seat allows for increased use of the inside rear tire. And it is fact the same grip distributed across two rear tires will go around the track more efficiently or ‘freer’, then with increased unloading of the inside tire and more use of the outside tire. Thank you for the input to my question. I was wondering why so many sprint kart drivers still sit up so tall. In addition a seat more laid down also gives an aero advantage.