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December 05, 2020, 09:10:45 AM


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Tyre temperature factors

Started by h106frp, June 15, 2020, 09:53:33 PM

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June 15, 2020, 09:53:33 PM Last Edit: June 16, 2020, 09:24:56 AM by h106frp
How do;
OptTemperature = 80
BelowTempFactor = 1
AboveTempFactor = 1
in the tyre file operate?

I guess that OptTemperature sets the ratio point of 1 for grip but how do Above and Below influence? I found a generic reference curve for temp/grip/wear;

So using this I would expect to use OptTemperature = 85, best compromise of wear and grip (design point)
So how do I model the Below - which is non-linear and the Above which improves the grip over a narrow range and then drops dramatically above 100 degC ?

I would expect to have to define a series of 'keys' to be able to obtain a realistic heat/grip function.

Another observation is the strange off track overheating of tyres, looking at the tyre file I am guessing that tyre heat input has been linked to 'resistance_' which is very high for 'sand' but as the front cannot spin why should it get hot? The rear might spin on a loose surface and aggravated by the media but this brief extra surface heat is unlikely to add much to the the bulk temperature.

Incidentally, does wear rate behave in a similar way to the one in the above curve as we only have single value for wear rate?

I would really like to be able to reproduce these curves in-game as it interesting to observe how, for instance the qulifier behaves using this graph - we raise our optimum temp to around 90 degC, we get a grip increase, we wear much faster, we can corner faster that increases heat (deformation) so we go into the 100 degC region and get high wear and sudden rapid reduction of grip - highside time and quite believable

Incidentaly, when does/what causes the marbles effect to activate for tyres? With the current bug that creates very high off track temps (150 degC) I would have expected the marbles animation to kick in but it is not apparent.


June 16, 2020, 12:06:35 AM #1 Last Edit: June 16, 2020, 12:09:51 AM by Manu
I think what you are looking for is this:

NumKeys = 2
Key0 = 0.9, 0.980000
Key1 = 1, 0.800000

Quote from: LOOPATELI on February 06, 2017, 04:01:54 PMI think I found what is numkeys for, it's something related to the tyre grip and the wear.
I've been doing some test and this is what I found:
NumKeys = 2
Key0 = 0.900000, 0.980000
Key1 = 1.000000, 0.800000
The first value is the tyre wear and second value is the tyre grip percentage for the specific compound. Between Key0 and Key1 the grip value is calculated using a linear interpolation I guess. And by default if you don't add a key on 0% wear and 100% wear the values are 1 and 0 on each.

Here is a Graph:

It's Easier to Fool People Than It Is to Convince Them That They Have Been Fooled.


June 16, 2020, 06:38:42 AM #2 Last Edit: June 16, 2020, 09:27:06 AM by h106frp
Thanks, but that key curve is wear/grip, I am after the grip effects of the tyre when it is above or below optimal temperature.

I would expect that this curve just shifts the unity ratio point of the temperature\grip\wearcurve