Sorry got that wrong didn't I. I was describing the system used in the Howmet sports/racing car which had a 3-speed auto gearbox and an enormous pair - of ceramic heat exchangers. There were two types of turbine indycar I now recollect; at least one was Lotus designed. The first had the ubiquitous Allison 250 mounted alongside the driver; the compressor turbine was kept at max rpm whilst the power turbine had a powerful braking system, thus spool up time was virtually eliminated!
Rover teamed up with BRM to produce their Le Mans car, but I don't know any details of the system used on this apart from the fact it too had ceramic heat exchangers