Gerhard Berger on a quick lap in his Benetton B186 at the Adelaide Street Cicuit in 1986.
Since it was the last race before taking effect of the boost pressure limitation it is probably the most powerful F1 car ever.
The 1500cm³ inline-four engine with up to (80psi) of single-turbo boost pressure revs up to 11500rpm with an estimated power of 1350HP.
There is no accurate information about the power because the BMW dyno was not able to messure the engine on full boost.