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Old 06-25-2003, 04:14   #1 (permalink)
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taxable horse power

Hi,
I was just reading through my owners manual to my EF Fairmont, and where the specs are that state how much power its got and stuff, it says "Taxable Horsepower"

I was just wondering what it meant

Thanks

Toby
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Old 06-25-2003, 04:38   #2 (permalink)
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Re: taxable horse power

they may mean HP lost at the drivetrain.

In other words 157kw at the flywheel may only mean 120 odd at the wheels if your lucky
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Old 06-25-2003, 05:02   #3 (permalink)
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Re: taxable horse power

In my AUII manual it rates the 6 cylinders with 31.7kw as taxable horsepower and 51kw for the V8's.
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Old 06-25-2003, 05:08   #4 (permalink)
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ah ok cool thanks for that :D

Toby
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Old 06-25-2003, 07:26   #5 (permalink)
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Re: taxable horse power

Quote:
Originally Posted by XR_Strider_GuY
In my AUII manual it rates the 6 cylinders with 31.7kw as taxable horsepower and 51kw for the V8's.
interesting. So if that's the supposed loss, that would mean that a 185kw AU1 XR8 loses 51kw, to be 134rwkw. And a VCT XR6 that has 172 loses 32, making it 140 rwkw? It must mean something else because even a stock Forte V8 will flog (well, only just beat) a VCT XR6!
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Old 06-25-2003, 17:44   #6 (permalink)
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Re: taxable horse power

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Originally Posted by JCHADby2
interesting. So if that's the supposed loss, that would mean that a 185kw AU1 XR8 loses 51kw, to be 134rwkw. And a VCT XR6 that has 172 loses 32, making it 140 rwkw? It must mean something else because even a stock Forte V8 will flog (well, only just beat) a VCT XR6!
I guess the driveline loss will be dependant on what transmission is behind the engine, a manual will have less power lose than an auto.

In regards to an AU forte V8 beating the VCT it also comes down to weight. The forte being live axle would be lighter than the VCT despite the added weight of the V8.
In terms of power i would hazzard a guess that a VCT XR6 and a V8 forte would put out similar figures at the wheels.
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Old 06-25-2003, 18:34   #7 (permalink)
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Pay Your Taxes!

Occasionally, usually when reading overseas vehicle information, I find reference to taxable horsepower. Taxable horsepower is a simple mathematics calculation used to determine the taxes to be paid on the vehicle. It has very little to do with actual horsepower because it doesn't factor in key elements like compression ratios, cylinder head design, and camshaft specifications. To calculate taxable horsepower multiply the cylinder bore x cylinder bore x number of cylinders x 0.4, and don't forget to pay the tax!
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Old 06-26-2003, 01:41   #8 (permalink)
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Re: taxable horse power

actually taxable hp means the power it takes to drive the power steer pump, AC compressor, alternator, water pump etc... so with everything going flat chat (ac on, psteer on full lock, as much load on the alternator as possible etc) on a 185kw motor at full revs you only have 134kw to play with at the flywheel.

obviously the above situation would never occur so you dont have to worry about this loss, you only loose a bit here and there as you drive
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Old 06-26-2003, 02:13   #9 (permalink)
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Re: taxable horse power

WRONG Rollin, it is an old,old British calculation, you will find a low comp 200 six has the same taxable hp as a 351
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Old 06-26-2003, 02:15   #10 (permalink)
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so does this mean, if u have the stereo pumping while trying to do a burnout or race someone, it will lose hp because of the alternator??????? or is the alternator fully charged when driving anwyay?? i have no idea
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