Tire air pressure is something that is discussed at great length here...however, I have no idea how air pressure affects handling. Could someone please clear this up for me. Does increasing the air pressure increase or decrease grip? Can I change the balance (oversteer/understeer) of the car by changing air pressure? If so, how? Also, is there a consensus about the optimal tire pressure for this car. Thanks in advance.

 

All this Info is in one of the FAQ's see here:-

https://www.s2ki.com/faqs/showfaq.php?threadid=17418