I can imagine VicMini13 walking to school thinking.. "A horse, a horse, my cold feet for a horse"....

Or at least some horsie poo to warm his cold feet....

They changed because Yamaha hit the market with prop-rated motors, that's why. The Yanks just had to change their test methods.
My old 70HP Evinrude/Johnson would be 60 at the prop if lucky.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Mike, I haven't seen it, but was it one like the dyno they used in their "Italian Supercar for the price of a Second Hand Mondeo" challenge? They reckoned that it measured the drivetrain drag on slow down to measure drivetrain losses, and so give flywheel horsepower. I wondered how accurate it would be. Maybe it is, I just hadn't heard of it before. If it isn't, then maybe the extraordinarily poor showing they had wasn't so bad... You see that sort of thing in MiniWorld sometimes, too, where they'll state the outputs for their dyno day are at the flywheel, not the road wheels. I'd imagine they're using something like that too? How else would they do it - without removing a heap of engines?
You're right about Jeremy and his "torques" though. If only he'd say lb.ft, so people would know what he's on about. "Torques" made me wonder why a few cars were lower than I remembered their Nm figures to be...

I think both the dyno and the "torques" thing are to make the show more commercial - they dont want to appear like car nerds and want to attract the widest audience. Lets face it TopGear was never about honest impartial reviews anyway - its about Clarkson praising every single British car as exceptional, bagging anything American (deservedly) and making jokes at the French.

Oh and in Europe all the modern cars would be using newton metres not pound/foot.

And the mini outputs at the flywheel from chassis dyno sessions you see from the UK just use some bulshit formula thats sees 1275 rovers with nothing more than a K&N filter an RC40 and a set of bonnet stripes get 110hp at the wheels.

Europe might use Nm, but Top Gear still uses lb-ft. I've checked the magazine. Kind of makes sense - if you're going to use hp, you should use its counterpart, lb-ft. Nm only works with kW - they're both metric measures. I didn't think Top Gear was having any ratings problems, though... Even if they do get kicked off air for snooker! Don't forget, Top Gear's also for praising the Monaro...
It's interesting that, while bhp/ps give roughly 30% higher a figure than kW, lb-ft is the opposite compared to Nm. 1kW = roughly 1.34bhp = roughly 1.36ps, 1lb-ft = roughly 1.35Nm.
So the dynos in England are like their award system for sportsmen..? Win two cricket tests (just!) and you get MBE's and a massive parade in London, win a rugby match in overtime and all get MBE's and a massive parade in London... Jonny didn't even kick as accurately as Flatley that day, and everyone still calls him a wonderboot... No, I'm not a racist, just an Aussie patriot! And born Irish.
It'd be interesting to see that formula for hp at the flywheel compared to hp at the road wheels...
Finally, repeat, along with Jeremy and me "Aston Martins are the greatest cars in the world. Aston Martins are the greatest cars in the world. Aston Martins...

well my car stock was meant to be 300bhp and 180atw for an auto . The reality stock is 280bhp and 170atw for an auto

well my car stock was meant to be 300bhp and 220atw for a manual . The reality stock is 310bhp and 240atw for an manual

so the calc depends on the gearbox and how much crap is hung off the engine.

Stock was factory uk, actual dyno in Aust

Bloke, those are some big losses.....power steering, A/C.....?

auto, p/s and a/c. 60 percent of the loss is the box and another 30 percent is the exhaust. That is stock.

Mine is 280bhp atw as of yesterday so god knows at the flywheel.

Also gearboxes drain more as you put more power through them due to the massive increase in friction. It gets to the point where more power at the flywheel only adds unreliability and adds very little atw.