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02-23-2012, 05:40 PM | #1 |
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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? |
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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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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02-23-2012, 06:35 PM | #4 | |
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Quote:
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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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". |
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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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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02-24-2012, 05:48 AM | #8 | |
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Quote:
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02-24-2012, 08:38 AM | #9 |
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