Eckstream:
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A twin turbo F1 engine in the mid-to-late 80's ........I can not remember the 'designation' ....... it may have been the engine prior to the the RA168(E ?) ........
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Twin Turbo 1.5L V6 .........1010 hp ............ many interesting features, but one feature that (initally) suprised me: cast iron block .....
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I believe the RA168 was similar, but had lower compression to comply with a new rule change ............. A presentation and document was prepared by the Honda engineers on the RA168 engine ....... this document is available from the SAE ........
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One of the engines - maybe the RA168 - was responsible for 15 victories (out of 16) in one season ....... I believe a crash by Senna kept them from going 16-16 ..........
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while we are on this subject ........... a not-so-well-known fact, but at one time, Honda was THE leader in turbocharger technology. They never did offer a production vehicle with a turbo ..... so that may tell you a little about how Honda felt about turbos on street vehicles ..........