Mansell's first win was GP of Europe in 1985 at Brands Hatch in a Williams Honda.
Oh so they old turbo engines that used to put out near 1000bhp? I remember. Yes and that would be great to have lotus back up there and williams more prominent too!
I think the BMW had 1400 hp, but in any case at the peak most good ones had over 1200.
I remember it being closer to 1300 (under 60 lbs/4 bar of boost!!!) but they were just guesstimating anyway because I don't think anyone ever put one on a dyno. That's more HP/cu. in. on 93 octane Sunoco (plus a dollop of snake oil) than the top fuel dragsters of the day produced on nitromethane.
They only used full boost for qualy because engine lifespan was very limited under that much pressure and petrol consumption was astronomical. They turned the boost down to ~800-900 hp for the race and sometimes still had to further turn it down to prevent running out of fuel before the finish. They also had liquid-cooled brakes and the winner would pull over and stop immediately after crossing the finish line -- no victory lap -- to preserve their chances of making spec weight.