xb4 "chassis flex settings "??

[shaun m]

Hi , can someone exsplain the chassis flex settings please , obiusly i know the less screws gives the chassis more flex for low grip , and more screws less flex etc ( i know im a bit dumb !! ) for high grip .

I normaly run my xb4 with just the 4x centre screws removed , but on sunday at the mid south reginals at torch ( my local and a cracking track !! ) i saw different cars/drivers , running different settings ..

Some had the outer front and rear screws removed , and some had the entire rear end screws removed ..

Soo at what point / track conditions would you change the flex settings ??