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Onboard at 130mph up Goodwood Hill Climb. Brace yourself.

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oritteropo says...

As far as I know you are pretty much spot on. The 919 was run in the LMP1 class with 8 megajoules of hybrid power and a turbo 4 cylinder petrol engine.

This evolution of the 919 has increased the power of both systems, by removing the fuel flow restrictions and increasing the output of the electric motors. The boost graphic is probably showing the deployment of the stored power from the lithium batteries, but it wasn't 100% clear to me (usually they will indicate when it is charging or discharging, and this didn't).

I didn't find a really good reference, but there is a bit on wikipedia https://en.wikipedia.org/wiki/Porsche_919_Hybrid

eric3579 said:

So my limited understanding is that it's a hybrid car (twin turbo 4 cyl and electric motor), and in braking, electrical energy is generated to use as boost coming out of the corner. It helps with power as there may be some turbo lag from the 4 cyl. I however could be completely wrong. Maybe @oritteropo knows for sure.

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