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That articles makes it sound like 1000 HP is sent to the powertain, but may not be utilized by the wheels. The 266 HP at 155 mph also supports that, as that's what you get with a NSX or lower end Cayman.
As for the P1 vs Veyron, they hit 300 km/h at about the same time with the SS being about 2 seconds faster. I can find a graph of P1 acceleration from MT (that unfortunately is a bit cutoff):
http://wot.motortrend.com/1403_9_ge...n_p1.html/2014-mclaren-p1-acceleration-chart/
Can't find a similar one for the Bugatti. Either way, the S7, with less power than the P1, was even up to 200 mph. The Bugatti is large (22.28 ft^2) and the CD even in top speed mode is only average. At 200 mph it's using 509 HP, leaving 491 for acceleration. The P1 on gas has 292 HP for acceleration or 468 lumping the electric motor in. I can't find a solid CDA so I'm guessing 20 ft^2 and using .34 CD which came up in a few sources.
lb/HP at 200 mph (4250 lb Veyron, 3250 lb P1)
Vey - 8.63
P1 - 11.13
P1E - 6.94
Go down to 18 ft^2 area for the McLaren and you get:
Vey - 8.63
P1 - 9.7
P1E - 6.36
This assumes the same efficiency for both powertrains though, as well as perfect gearing.
As for the P1 vs Veyron, they hit 300 km/h at about the same time with the SS being about 2 seconds faster. I can find a graph of P1 acceleration from MT (that unfortunately is a bit cutoff):
http://wot.motortrend.com/1403_9_ge...n_p1.html/2014-mclaren-p1-acceleration-chart/
Can't find a similar one for the Bugatti. Either way, the S7, with less power than the P1, was even up to 200 mph. The Bugatti is large (22.28 ft^2) and the CD even in top speed mode is only average. At 200 mph it's using 509 HP, leaving 491 for acceleration. The P1 on gas has 292 HP for acceleration or 468 lumping the electric motor in. I can't find a solid CDA so I'm guessing 20 ft^2 and using .34 CD which came up in a few sources.
lb/HP at 200 mph (4250 lb Veyron, 3250 lb P1)
Vey - 8.63
P1 - 11.13
P1E - 6.94
Go down to 18 ft^2 area for the McLaren and you get:
Vey - 8.63
P1 - 9.7
P1E - 6.36
This assumes the same efficiency for both powertrains though, as well as perfect gearing.