Issue: McLaren 650S GT3 overheating reartires

The rear tires overheat extreme fast and you have after 2 laps no more grip. Driving through corners are then nearly impossible. It can't be normal that there going up to 130 ºc. With controller this car is undriveable in my eyes.

 

it may be useful to add tyre compound and ambient temp if you can see it.

im not a fan of the GT cars but im sure I read in the PC threads that the soft compound is only good for a few laps in the right conditions.

 

The GT3 tyres are really circuit/temperature dependant. The softest compound is not always the best choice, and if the ambient temp is high or there are a lot of fast corners (mugello, silvertsone for example) and your tyres are still overheating then I suggest moving to a harder compound.

Also you might want to use TC in order to help prevent wheelspin out of slow corners, this will also help keep temps down.

 

What compound and what weather did u drive with?

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There are guys running 15 laps on softs. No idea how.. Mine only last for 5 laps average.

You can also try lowering your rear wing a notch or two and/or increasing the rear tyre pressure, changing toe, etc.
And as said, maybe increase TC and/or drive more smoothly to prevent excessive heating.

 

Hey Coincidentally I put quiet some time in the McLaren 650S.
For me it runs absolutely brilliant, smooth and no overheating even with TC off. (See here for example Silverstone or here: Spa)
After 10 laps or so the tires start to dismantle significantly. But that is normal i guess.

In basic-setup the car tends to oversteer very much. Maybe you are getting the high-temps because you are sliding too much?

 

Tire temps are after 3 laps where the car starts to lose grip on the rear
mugello 26º air temp track temp is 32º and grip is 100%
Front left 97. 94. 90
Front right 67 70 72
Rear left 113. 110. 108
Rear right 79. 81. 84
Using medium compound and basic setup

With the soft tire it's the same only the temps are higher.
No question that with a wheel you can drive much smoother.
But the other gt3 cars I drove so far where much easier to drive
And the tire temp didn't grow that fast even you have a light slide

this car shows where the limits are with controller maybe I'll find a setup that the car not oversteers too much. It can't happen on the tires itself, because on other cars I can drive much more offensive.

 

So? Adjust tire pressures? Make the car stiffer maybe? Add some traction to the rear.

 

Yeah, as mentioned Mugello is pretty much the worst on temps, the high speed compression kill tyres very fast, so this is a worst case scenario.. Your temps seem pretty normal to me, with the left hand side tyres taking massive loads at that track. Again, hard tyres might be more suitable for Mugello.

Surface temps will be very high at this part of the track, but will cool down to a reasonable level for the rest of the track.

 

Thanks to all for help. I've done a bit more downforce to the rear but the major improvement came with stability control. I'm increased it from 0 to 40 and now it's been much more easier to manage the tires
I always want to drive without any assists, but here it's really better to drive with SC

 

Never use softs in Mugello with these high downforce bends.
Mediums or even hards are must.
On the contrary Monza needs soft tyres in order to keep them heated in these long straights.

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Because of the Stability-Control the car oversteers less. But you can make the car oversteer less with other Setup-Components too. By doing this just wouldn't need to put assists on you actually don't want to put on.

 

This was the next step. To figure out how the car reacts on setup changes. And you're right. I made some changes on both differentials and increase the downforce on the rearwing. Now I can drive without tcs and stability control and I have a better feeling in fast long corners.
Tire temps now after 7 laps on medium compound
FL 94 91 87. FR. 77 80 83
RL. 84 82 80. RR. 71 73 75

So it's seem that it's only a question of the setup I'm using.

 

On Mugello in GT3 cars I usually pick medium compound when it's coldish and hard when it's warm. The left side will start to get red hot through the final sector and is good after the straight again. The front tyre is way worse than the rear. Your experiment with SC implies that you were indeed just powersloding way too much without it ;-)

 

And racing in hotlap mode isn't all and therefor I like the improving tyre model versions. Last GT3 league season I was driving with the Huracan versus a very fast Z4 in a 24 laps Mugello race. He was 0.5 to 1s faster each lap and 10s away after half the race. So I decided to not pushing too hard and take care of the tyres and not changing them in the mandatory pit stop and came out just in front of him. Battle every corner to nit let him pass and using the Lambo power at the straights to hold him behind me. Great experience

Or other example: Little Evora GTC Cup racing at Vallelunga. While others tried to find a good qualy setup for non-overheating softs for days, the better way was to focus on mediums. Result: Easy pole and awesome race pace.

Or to say it in short: very good that the compound choice isn't based only on the race distance any more. Variety in race strategy can be so much fun. If it works

 

And you've got a wheel. I expected that before release but you have with controller no chance on longer distances exept you have super left thumb it make so much difference like you turn into the corners. A bit to much angle and the car slides.
It's even with controller tons of fun but it's really hard not to turn to much the wheel. No I drive the car complete without assiste even with 0% stability control. But it's a different cup of tea to that on time trial or in race competition. Then you have to add tcs and sc.