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Each of those cars represents serious money. I’m not denying that they exist, but as they say, big claims go best with hard evidence. Going on the one for sale I’d imagine they cost around three times the asking price to build. Both of those you linked to are circa 800 horsepower, also- making another 300 when you are already at a big number is no joke.
IDK, maybe the postie has made a fortune in Bitcoin and does his round for the exercise.
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1,100 sounds like, how can I put this, a lot. Now, don't get me wrong - 1,500 horsepower can be had from very small capacities and a modest number of cylinders, but they only have to run for ~6 seconds at a time, typically.
It was more that in your first comment you sounded unconvinced that they could get there, then softened and said that they only had to run for 6 seconds. My point was that there are a lot of small capacity, big turbo cars running around, and unless everyone is embellishing, a lot that are fairly well used without having to rebuild after every 6 second pass. Cost isn't a issue to building suff like this and from what I've seen, a lot of the big power Scandinavian cars seem to be built by talented home-garage builders.
As you say, maybe postie made a fortune and his job keeps him out of the house. Maybe he saved up for a decent chunk of his life to buy one and got something someone else had blown a small countries operating budget on. Maybe he did all the engineering in a single garage with ebay parts on a limited budget. Maybe he managed to fudge the numbers for a one-off peak output on a dyno. Any route, Audi 5 pots are out there with that kind of power.
Try telling that to half of the guys who take their cars to Gatebil...
http://www.speedhunters.com/2012/07/you-know-that-one-audi/
http://www.speedhunters.com/2013/07/the-quattro-warrior-audi-80-like-no-other/
https://gatebil.no/for-sale-unique-800-hp-audi-80-quattro/