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(Grip)
(Tyre model)
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===Tyre model===
 
===Tyre model===
 
We will only focus on the 3 following parameters in this section : Radius (m), TorusRadius (m) and Width (°)
 
We will only focus on the 3 following parameters in this section : Radius (m), TorusRadius (m) and Width (°)
  +
  +
you have the following input parameters : width of the tyre (W), height of the tyre based on the ratio (R) and rim size (usually 17") (Rim)
  +
  +
Height (H) = W * R/100
  +
  +
diameter of the wheel with tyres (D) = Rim x25.4 + 2 x H
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  +
Width (in °) = atan(W/H)
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  +
Radius = D/2
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  +
TorusRadius = W/2/sin(Width in °)
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These formula may need to be changed !!! Be careful !!
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  +
   
 
For the moment, this info is still not confirmed, but based on reverse engineering we suppose this is the tyre model used:
 
For the moment, this info is still not confirmed, but based on reverse engineering we suppose this is the tyre model used:

Revision as of 20:30, January 14, 2014

Tyre model

We will only focus on the 3 following parameters in this section : Radius (m), TorusRadius (m) and Width (°)

you have the following input parameters : width of the tyre (W), height of the tyre based on the ratio (R) and rim size (usually 17") (Rim)

Height (H) = W * R/100

diameter of the wheel with tyres (D) = Rim x25.4 + 2 x H

Width (in °) = atan(W/H)

Radius = D/2

TorusRadius = W/2/sin(Width in °)

These formula may need to be changed !!! Be careful !!


For the moment, this info is still not confirmed, but based on reverse engineering we suppose this is the tyre model used:

 Radius
 <---->
><=====   : 1/2 Tyre
^^
Torus



Other view:


  /   
 /
/
\     ^
 \    | width (in °) 
  \   v 

To retrieve the width of the tyre :

  • W = Sin(Width) * TorusRadius * 2

Grip

To limit the bike angle in GPB, you need to play with the grip parameter.

Each tyre has 3 coumpounds. Right now are 6 different Tyres available (Qualify, Soft, Softhard, HardSoft, Hard, Wet).

Usually, you have the same compound use for all 3 parts (example : soft tyre, hard tyre, ...).

The Softhard and Hardsoft tyres use different compounds on the tyre (e.g. compound 0 - soft, compound 1 - hard, compund 2 - hard). They are asymmetric tyres.

Here is the compound order:

  • c0 = left compound
  • c1 = center compound
  • c2 = right compound


Each compound has its own properties on different track surfaces (e.g. asphalt1)

asphalt1
{
  dry_grip = 0.98
  wet_grip = 0.7
  max_wet = 0.5
  curve_type = 1
  resistance_dry = 1
  resistance_wet = 3
}


The lean angle is based on the lateral grip the tyres can generate.

It is based on the following paramters : compound, temperature, wear, wet, grove, marbles and road banking. 

So to limit the bike angle, you have to reduce the dry (or wet) grip.

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