Tyre temperatures

[Tim Ling]

I get the feeling there may not be a precise answer to this, but here goes.

The setup guide recommends tyre temps of 90-110 deg. Should I put air in to increase the temp, or take it out? And how many....whatsits...equal 1psi?

I am trying to understand how setups work, lets just say I'm a little, um, special, and need extra help

 

[Günthar Rowe]

you´re just bragging now :wink:
BTW ... What tool is that for the temps Günthar?

GTR²-XD, that was a screenie out of GTR2 on Mangy Cours 2004 in a Saleen S7-R in prep race for the IGTO 192km race on tomorrow night...

There is a W.I.P. of GTR²-XD for GTR-E to be out soon...

 

[Günthar Rowe]

Here are some W.I.P. of GTR²-XD like apps

http://forum.racesimcentral.com/showthread.php?p=3893658

 

[Lu Chan]

* Lower pressure = Higher temperature
* Higher pressure = Lower temperature
* Higher spring rates equates to higher temperatures ( tires get "pushed" to the ground)
* More toe in (a greater - value) in the front tires causes higher temperatures
* More toe out (a greater + value) in the rear tires causes higher temperatures
* The Anti roll bar is also used for equalizing the temperatures across a set of wheels
* Higher tire pressure will get you a more responsive setup, but to much and you'll lose grip - lower pressure works the other way around
* The temperature spread across a tire should be between 5-10 degrees C (use camber to adjust temperature)
* Optimal tire pressure is somewhere around 180 psi
* The tires shouldn't get warmer than 100 c (if you want them to last a race)

* Many books have been written that covers this in great length...
* Many race technicians and race drivers never get to grips (no pun intended) with the physics of tires...
:thumb:
Kind regards,
Karl

this is good information for me. i'll copy & save it.
thx Karl.

 

[Ryan Callan]

My brain, it hurts.

This is all very useful thanks guys - I got by pretty well in Forza 1 without knowing all this, but it obviously wasn't as critical or detailed as in GTR Evo.

 

[Lee Downham]

Here are some W.I.P. of GTR²-XD like apps

http://forum.racesimcentral.com/showthread.php?p=3893658

Same dude posted same app in a thread here at RD ... http://forum.racedepartment.com/gtr-evolution-mods/7706-real-time-telemetry.html
Real Time Telemetry
... have been using it and its good!

 

[Jaius Dewing]

all very good information guys, im going to hit the track now to test this stuff out

 

[Johan Bergqvist]

Interesting reading all, Looks like I'm not too far from the truth either in my setups. I just think I have to do different setups on each side of the car.
Then my question, do I have to change the camber settins on each side aswell, or am I making it more difficult by doing that?
The toe in setings, I guess must be set exactly the same otherwise the stability must be effected.

 

[Attila Domján]

Toe you can not set independently on the right and left side, with camber you can (and should) play independently to reach optimal tyre temps.

 

[Günthar Rowe]

and don't forget Castor to guys, this allows you to decrease camber by the more castor you use, when the tire is worked/loaded up, it give more camber so to speak... why reduce camber? well it'll give you better braking on the front and better power transfer too on FWD, only some cars allow castor on the rear...

 

[Attila Domján]

Ye, therefore i use high caster (13-14) together with high camber (around -4,6-4,8 at front) for qualy set, to get the most out of the tyres. Of course race setup should be always with lower camber, the caster i do not touch to decrease tyre wear, since it effects other stability behaviour also for the car during cornering.

 

[Johan Bergqvist]

Sorry I did not quit understand mr Rowe, what does caster do?

 

[Lee Downham]

See this link for a good description of how to use caster ... http://www.race2play.com/forum/list_posts/4128

@ Atti (<--- no that is not me stuttering :lol ... I used caster setting last week (for first time) to great effect on an Aston to help both improve its handling and considerably reduce tyre wear

 

[Lee Downham]

... on the same topic and not meaning to hijack, but what temps do wet tyres run at?

Seems like somewhere in the 60's works and is all I can get outta the darn things on a mini no matter what I do ... pressures still seem OK at 180kpa though.

 

[Johan Bergqvist]

Thanks Lee very helpful info.

 

[Lee Downham]

Thanks Lee very helpful info.

Don't thank me thank Neil ... :wink:

nice little article on tyres here http://www.race2play.com/forum/list_posts/4127
as well as a few other setup tips

 

[Günthar Rowe]

... on the same topic and not meaning to hijack, but what temps do wet tyres run at?

according to the tire physics files, they have the same optimum pressure and temperatures as the Slicks... i.e.90C

 

[Lee Downham]

according to the tire physics files, they have the same optimum pressure and temperatures as the Slicks... i.e.90C

Wow ... I am stuffed then :lol:
At Laguna Seca in my mini, they quickly fall off to the 40º's to 60º's depending on setup, but never want to maintain any more heat

 

[Mikkow]

The only real way I've found to keep heat in the rainy front tires is to stress them by inducing some understeer when cornering. This means turning the wheel beyond the point of turning. Giving it some more throttle also helps. It'll make the tires squeal but at least they'll gain/keep temperature.

 

[Johan Bergqvist]

nice little article on tyres here http://www.race2play.com/forum/list_posts/4127
as well as a few other setup tips

Thanks Neil for that link, it's very helpful:thumb:

 

[David Buxton]

I'm glad I spotted this post :becky:

I always thought the higher the pressure the more heat. But when you think about it the higher the pressure the less tyre is on the road.... technically..

Cheers guys

:amen: