Back to the regular six hour races and back to the regular season way of doing BoP.

• General return to pre-Le Mans relationships
• Gains for Cadillac, Porsche and Toyota (P/W)
• Ferrari and Alpine lose out (P/W)
• BMW lose weight, but gain power.
• Proportionally bigger power changes v. weight changes.
• Changes to base performance has seen some offsets with high speed power, or maybe it is the other way around – that tweaks to the top speed needed offsetting.

Here is a look from some time ago of the performances and BoP that went into this. This will be compared to the changes later…

Here is an introduction into the approach.

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Power:Weight

Comparison to previous three races

the chart below compares the last three races performance to the relative movement in BoP for Power/Weight from those three races to the latest BoP for São Paulo. It uses the best two race performances of each car¹.

It is noteworthy that the correlation between BoP movement and performance is greater when you don’t chose the top two races for each car. There are some potential reasons for this. The top two could be defined differently by the rule markers, the rule makers will go to more effort to remove laps that aren’t suitable (here it is a simple average of Top 10 laps and top 60%).

On top of this, it is always worth remembering that this is just P/W as, depending on track, or which specific part of performance is being corrected for it could be weighted more to weight, power, or high speed power. As shown below, there is some compensation the P/W adjustments with high speed power.

On this measure Ferrari has lost out, Toyota and Aston Martin a little too. Cadillac is a big gainer.

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Weight

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Power <250kph

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Power >250kph

Comparison to previous three races

There is some compensation for the drop for Ferrari and Aston Martin in P/W in that they gain on high speed power, and the opposite direction for Cadillac. Which aligns with the Power being the bigger movement in the P/W change.

As we’ve seen before it is multiple dimensional.

Last year at São Paulo the speed trap data appeared to well before the highest speed point on the track. As such this wasn’t useful to gauge the true top speed for each car. Hopefully this is corrected for this year.

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Long Term Tables/Charts

For reference here are the BoP tables for power and weight going back to the beginning of time.

1. An introduction to how this calculation works. Note this was written before the two of three consideration was introduced. ↩︎