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Old 02-23-2012, 05:40 PM   #1
maxeveland
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Pricing announced for Uk version. Question about Horsepower

This article states that prices have been released for the UK version but I have a question about a quote in the article:

http://www.motorward.com/2012/02/toy...m-24995-in-uk/

"The engine, made by Subaru, churns out 200hp, of which only 170 will actually make it to the rear wheels."

So where does the other 30 hp go, and can I still feel the power?
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Old 02-23-2012, 05:45 PM   #2
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The rest is lost through the driveline. It takes power to spin all those parts. Do some reading on "Brake Horsepower" and "Wheel Horsepower" on google.
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Old 02-23-2012, 05:45 PM   #3
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There isn't an exact formula since too many variables can affect the drivetrain loss, but a general rule of thumb is to subtract ~20% from flywheel HP to get an approximate RWHP. Again, it's different from car to car, it's a rough estimate
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Old 02-23-2012, 06:35 PM   #4
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Quote:
Originally Posted by Dave-ROR View Post
The rest is lost through the driveline. It takes power to spin all those parts. Do some reading on "Brake Horsepower" and "Wheel Horsepower" on google.
^ This. Frictional horsepower is the reason a vehicle loses a percentage (not an exact figure) of the horsepower produced at the crankshaft on it's way to the wheels. What is frictional horsepower? It's power dissipated as a result of driven components (I.E. pulley's, propeller shaft, transmission, transfer box for AWD vehicles, differential, camshafts, axles etc..).

But just to add on, you can reduce parasitic driveline loss (the term used to describe horsepower lost as a result of frictional horsepower) by either deleting certain driven components (AC compressor pulley, power steering pulley) or reducing/increasing the size of certain pulley's (Increase in AC compressor, power steering and alternator pulley size. Decrease in crankshaft pulley size.).
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Old 02-23-2012, 06:56 PM   #5
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Wait, flywheel horsepower isn't measured with accessories???
Driveline friction accounts for about 10% of power (AWD having extra diffs adds a few more percent), tires lose about 1%, the rest isn't a true "loss".
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Old 02-23-2012, 10:06 PM   #6
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I've always calculated around 15% as a fair amount based on the cars I've owned and from what I've read over the years.
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Old 02-24-2012, 12:14 AM   #7
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Anyone else think that £24,995 seems a bit high for the entry level? I know that we can't do a straight conversion for north American pricing but in current Canadian dollars that's $39,000. The miata in the uk starts at £17,995, ($28,000 from Mazda Canada) significantly less than this.
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Old 02-24-2012, 05:48 AM   #8
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Anyone else think that £24,995 seems a bit high for the entry level? I know that we can't do a straight conversion for north American pricing but in current Canadian dollars that's $39,000. The miata in the uk starts at £17,995, ($28,000 from Mazda Canada) significantly less than this.
our entry level is your top spec level - comes with sat-nav, parkins camera, biggest wheels and all that junk
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Old 02-24-2012, 08:38 AM   #9
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our entry level is your top spec level - comes with sat-nav, parkins camera, biggest wheels and all that junk
Basically the one Americans want but don't wanna pay for lol.
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