Tyres & pressures

[Smck74]

I'm new to sprinting and hill climbing and a I've seen loads of guys in the pits at our events playing with their tyre pressures. However they are a bit coy when I it comes to passing on info regarding what they are doing. What I do know is most of them are getting better times than me! I was hoping someone here could spill the beans with tyre pressures as I'm struggling even with google! I am planning on buying a set of 888's after seeing that's what most of the guys run with in the club. I'm racing in my mk5 golf r32 with a few mods. Appreciate any help