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tyre wear

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Andy Higgins medal 5000
5 years 338 days ago
hi after some advice 
i noticed in yesterdays race (5 degrees) that my tyre wear started at 7% wear but as the stint went on this was reduced to 3% 
can anyone tell me why this was and how can i calculate this into my strategy 
any advice would be welcome
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Best Solution -- Selected by Ian Mason

Kevin Taylor medal 5000
5 years 338 days ago
Tyre wear isn't linear. The wear percentage each lap is a constant but it isn't 7% of a new tyre it's 7% of the remaining life of the tyre. You can get a good approximation by using the percentage figure obtained during practice inserting into the following calculation. 

Remaining life at end of lap = Life at start of lap - (Life at start of lap x Tyre wear/100)

If you insert this calculation in a spreadsheet you will find that a tyre experiencing 7% wear per lap (your example) will look like the table below. It's not absolutely accurate because iGP doesn't give you a decimal figure for tyre wear. If 6.001% to 7% are all displayed as 7% this can make quite a difference.

Example
Start 100%
1       93
2       86
3       79
4       73
5       67
6       62
7       57
8       53
9       49
10     45
11     41
12     38
13     35
14     32
15     29..... etc.
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Connor Cooper medal 4909 Super Mod
5 years 338 days ago
If the temperature remained constant, it could have been because the fuel you had in your car was decreasing so the tyre wear per lap decreased. This is what I think would have caused it, but I am not sure how you would plan for this in your strategy. 
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Andy Higgins medal 5000
5 years 338 days ago
thanks for the reply Connor much appreciated
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Kevin Taylor medal 5000
5 years 338 days ago
Tyre wear isn't linear. The wear percentage each lap is a constant but it isn't 7% of a new tyre it's 7% of the remaining life of the tyre. You can get a good approximation by using the percentage figure obtained during practice inserting into the following calculation. 

Remaining life at end of lap = Life at start of lap - (Life at start of lap x Tyre wear/100)

If you insert this calculation in a spreadsheet you will find that a tyre experiencing 7% wear per lap (your example) will look like the table below. It's not absolutely accurate because iGP doesn't give you a decimal figure for tyre wear. If 6.001% to 7% are all displayed as 7% this can make quite a difference.

Example
Start 100%
1       93
2       86
3       79
4       73
5       67
6       62
7       57
8       53
9       49
10     45
11     41
12     38
13     35
14     32
15     29..... etc.
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Connor Cooper medal 4909 Super Mod
5 years 338 days ago

Andy
thanks for the reply Connor much appreciated


No problem. Kevin has now put a more accurate response which includes how to implement it into your strategy. 
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Andy Higgins medal 5000
5 years 338 days ago
kevin
thank you that explains it brilliantly and is what i read of my data 
i will now go and place this as part of my strategy 
cheers and much apreciated
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