Tyre Pressure

[tacker]

Guys,

I have just been given a few sets of porsche cup slicks to suit the GTR anyone know a good starting point for these tyres was thinking about 24 PSI cold as a start

[hobzta]

are you using them for drag or for track ?? as this will change the pressure you want to run

[tacker]

They will be used for track days

[tacker]

Anyone have any ideas?

[hobzta]

I'd prolly look at a little higher than 24psi...but this depends on the actual size of the tyres.

Do they have sizes written on them ??

Did you ask the bloke you bought them off what he ran them at ??

[tacker]

LOL

I didnt buy them i just helped my self to the bloody great wall of used slicks the teams left behind after the Dubai 24 hr race. So i dont know who used them to ask.

The size is 240 x 640 x 18

Edited January 16, 2007 by tacker

[hobzta]

haha fair enough, I would suggest prolly starting somewhere around 28psi, once they are hot they will start to stick more, but you don't want to go too low in the pressure as the handling will become sloppy.

I would take them to a track day and start at around 28psi, as they start to warm and get sticky start letting them down bit by bit until it gets to the stage where it start affecting the in corner handling then pump them up a little bit. That's what I did to work out the pressure in my drag slicks (obviously didn't matter about cornering, but I did a pressure vs ET/Speed test). Odds are if you go to a decent track day their will be people there running slick (not nessacerily the same) but they would be able to give you a rough idea.

[T04GTR]

19psi front and rear.

thats what mine are