Tyre pressures for slicks?

[Grubbster]

I've just had my slicks fitted ready for Monday - it is really weird how they inflate and 'grow' almost like an inflatable toy

 

What pressures should I set them to for a trackday? They are Yokohama, 160/515-13 and 200/550-13. The shape seems to vary a fair bit when the pressure is changed

 

Solent Se7ens Web!

 

Edited by - grubbster on 13 Aug 2010 16:36:35

[Racing Snake]

At Cadwell my fronts were graining at 18 psi

A drop to 17 psi and all was 😬

 

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Mad Hatter Racing - Feel The Duralight R Torque 😬 Carl @ Penn 7's Caution - May Contain Nuts !

[Grubbster]

I've tried them for size on the car, the rears look huge but nothing rubs thank goodness! The garage set them to 25 psi so I can just reduce them to whatever I want - 25 psi makes them like donuts 😬

 

Solent Se7ens Web!

[Slipper man]

I use 17-18 psi hot. That relates to 13-14 cold on my car

[Jason Plato]

the yoko rears have a fair bit o sidewall flex under hard cornering, it would be wise to check the sidewalls for chassis contact during breaks between sessions

 

I've seen them flex upwards of 25mm and contact the rear radius arms

[jchasey]

Also on the Sigma the driver side intrusion bar has a new design which means part of it sticks out further, causing problems with wide slicks. Attention with an angle grinder brings things back in line.

John

[Rob Walker]

Steve,

 

Start at 18 psi cold and be carefull on them until you have done a few laps there will be little grip until they have warmed up as they have been stored . When are you on track are there any spare places ?

 

Rob

[The Pikey]

I was told to set mine at 18 all round and then do a few laps and set them again to 18. After one tame session at Castle Coombe the left tyres were 21 and the rights were 20.

 

Jason

 

 

[Grubbster]

Thanks all, I'll start at 18 and take it from there.

 

Rob - Castle Combe on Monday - YHM

 

Solent Se7ens Web!

[A10ROX]

no experience with that particular tyre

however Avon (crossply) seem to perform at 17-18psi warm and 21 all round when hot

 

Set to 17, do some laps check again and reduce to 21

Look at the trye and consider how they feel and adjust accordingly

 

ECK 16 IMHO does feel a little to low?

 

 

Palmer Sport Driver of the day 27mar10!