taxable horse power - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

toby123 · 06-25-2003, 04:14

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

Ramrod429 · 06-25-2003, 04:38

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

XR_Strider_GuY · 06-25-2003, 05:02

In my AUII manual it rates the 6 cylinders with 31.7kw as taxable horsepower and 51kw for the V8's.

toby123 · 06-25-2003, 05:08

ah ok cool thanks for that :D

Toby

JC-XR8 · 06-25-2003, 07:26

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!

XR_Strider_GuY · 06-25-2003, 17:44

Quote:

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.

XC351 · 06-25-2003, 18:34

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!

Rollin · 06-26-2003, 01:41

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

XC351 · 06-26-2003, 02:13

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

crowbar · 06-26-2003, 02:15

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