Tyre temp problem

[Leper Messiah]

I'm slowly getting to grips with the dark arts of setting up a car....but I'm seriously struggling to get the front tyre temps anywhere near optimum (rears seem to be ok). I've downloaded the engineers manual for GTR which I'm presuming (hopefully not falsely) has information pertinant to GTR2. It seems that peak temp for grip is around 80-105 for dunlops and michelins and 90-110 for Pirelli's. The most I can get the temp up in 20 lap test stints is 70-75. I've adjusted the pressure somewhat which had a very small effect. Is this the route I should take? If so, why is the default pressure such that it's hard to get up to optimum temp.

[Mayo]

you could also lower the front suspentions hardness (Nm). That would give you more temp, grip but also more wear on the tires.

[KarlosDaJackal]

I've had the same issue.

Its partly a setup thing, and partly management of the tires. On a Lambo or an S7, i'll run the front pressures at the minimun they can go to, then I setup the car as usual. I lean on the front a lot during braking and like the back of the car faily loose, which is fast and fun to drive but does not push the front tires.

So I try to setup the back of the car (especially the diff) so that once its got some grip it will push the front of the car harder (slight understeer). This helps the rear tyres last longer also.

For this to work depends a lot on your style, I try to brake late all the way to the apex, usually the back of the car is sliding somewhat. Then when the car is ready to where i want it to go I floor the throttle. Usually the back sticks as the diff is set to 60% and the slow bump, slow rebound on the back of the cars are both around 4. So the back grips more than the front, and the front will slide (understeer) a little which generates more heat. Effectivly your sliding into the turn under brakes and then using the throttle to make the back stick and fire the car out of the turn.

A tire that is sliding will heat up faster that a tire thats within its grip limits. Obviously your car either has to much grip at the front (so reduce it with less downforce, stiffer anti-roll bar, less camber) or the back has to little grip.

But I'm not the fastest guy out there so there may be better ways :)

[Leper Messiah]

Thanks for the info guys, I'll do some more testing with what you both suggest.

[sirnicolai]

Have you had any luck with this ?
Ive just started playing and im having the same trouble, still tuning my Lambo, but so far nothing I do seems to make a difference to the front tyre temps.

Im still learning and I dont think im braking as hard as I could be which could explain some of it.

[Leper Messiah]

I had a fair bit of success with the suggestions, finding the balance with temp and grip over a long race stint is still eluding me. I was either braking too late and locking up or being too carefull and braking too early, which won't work the tyres enough. As I've practised I've got better at judging the braking. I'm still not good enough, but this is a game that demands top skills to go fast.

[Sterling Moss]

softer compound on the front?

[Leper Messiah]

softer compound on the front?

softs don't last long enough

[SANTANA_DK]

what about using a live telemetry program ?!?!?
i set my laptop on lan with my pc while i drive and i can moniture the tyres temp, the tyre wear, L. of gas per lap, brake temp. and so on.
the program is called GTR2_PD; and after i started using this program while i drive i can see my times going down and better sutable setups for my drive style.
So i advise TO GET IT !!!!!!!!

[Leper Messiah]

what about using a live telemetry program ?!?!?
i set my laptop on lan with my pc while i drive and i can moniture the tyres temp, the tyre wear, L. of gas per lap, brake temp. and so on.
the program is called GTR2_PD; and after i started using this program while i drive i can see my times going down and better sutable setups for my drive style.
So i advise TO GET IT !!!!!!!!

All well and good if you have a laptop, but no use if you do not! But if I ever get a laptop (come on lottery win!) then I'll use that utility.

[bentfocus]

I can't seem to find GTR2_PD.
I can find GTR_PD though.
Can someone post a link?
Thanks!

[GUPSTER]

http://forum.rscnet.org/showthread.php?t=268638

:D

[bentfocus]

Thanks alot gupster!
I was at this site and found only GTR_PD...strange.
I'll be trying this out tomorrow!

[sirnicolai]

Wow, thats cool. And I just happen to have a work lappy I can use :)
But I cant seem to see a "Danger to Manifold" warning ?? I dont want to have my passenger footwell suddenly fall out of the car. :P

Also I think I just realised I should untick "Autoselect Tyres" so I can mess around with the compound.

[Freddyfartbox]

I always thought it was good to reduce the Power and Pre-load settings of the Diff to get a car to behave whilst accelerating out of a corner (mainly the Saleen S7-R, with all those horses), but I've realised, with LOTS of tinkering, that once you have the gear ratios setup so the car accelerates well without excessive wheelspin, and the rear spring rates set to absorb all that force, and the Diff Power and preloads mildly adjusted (with Power slightly increased, rather than decreased, so I've found), you can use that basic setup, with minor adjustments, for just about all circuits, as soon as you learn how the car behaves. Tyre pressures can play a (relatively) major part in the process, though remember that, for example, the Aussie V8Supercars run with about 26-27 PSI (to get PSI, times the KPA by 0.14504, so 200kpa=29 psi), although they have an extremely hard tyre compound, for a car that weighs about 1300kgm (Ithink?). And it's not just starting pressures that affect car handling, but how much the tyre heats up during a race, considering compound, race length and your driving style. My advice is to practice with one model of car on different circuits over a period of time, concentrating more on suspension setup and correct/friendly Diff settings and Gear Ratios, and finding a setup that works for you, ie, allows you to either understeer/oversteer the car the way you feel comfortable, doesn't cause excessive wheel spin while accelerating through/out of corners or when downshifting, doesn't 'drift' in a straight line and turns in well. What works for one doesn't work for all, so make sure it's comfortable for your driving style. I, for one, chew the shit out of tyres, because I push hard and tail-slide the car into corners. It doesn't make me particularly fast compared to alot of guys racing online, but it's a shit load of fun.