The fuels they used were crazy. They were making maz power at lambda 1.1, which is about 15:1 on that tuolene rocket fuel.
And the BSFC numbers are below 0.3!! That's crazy for any turbo engine.
I know one of the Brabham mechanics from those days pretty well. He always said that the only problem they had was the engine management was pretty crude. It was really only Honda and Ferrari that had anything decent and even that was flawed.
I've done retro fits on a pair of Ferrari F1's from that era with modern ECU's, etc. Except we ran on C16. They are fascinating engines to work on. Both cars we've done regularly do 3-4 race meetings without a rebuild running 3 odd bar. It's amazing what modern lambda control, knock control and rev limiters do for an engines life!