How many cars rate HP at the Crank?
 

One thing that really bugged me was finding out that the real HP of my FR-s is about 174 not 200.

How many cars are rated by the company at the crank? I feel it's kinda fraudulent.

all and it's not fraudulent at all...they don't claim WHP...

Why does the number bother you? The car still feels the same, doesn't it?

Edit: it's also a more consistent measurement of power.

Car club bro

Must be the first car you've owned and taken note of the power rating figures. There's several good reasons they do this and it's covered in several threads... fraudulent? No...

Uhh pretty much every manufacturer? I can't think of any that advertise horsepower to the wheels.

all right... if that's the standard. Seems the hp and torque at the wheel is what matters.

It all matters and is all relevant, both figures tell you different stories

it's call horse power war for a reason, if u are in that game you brought the wrong car.

I thought everyone knew all OEM's rated crank HP, unless they state otherwise. But lets say a camaro has 300WHP and a Stang had 310HP people will buy the Stang although the camaro makes way more power.

Ultimately yes. But crank HP is a more consistent way for manufacturers to rate engines.

WHP has so many variables (tires, wheel size, weight over the axle, temperature, coefficient of friction of the surface, etc.) that it becomes practically impossible for a manufacturer to provide an accurate number.

You down with SAE? Yeah, you know me.

Car manufacturers follow SAE standards to measure the crank HP of an engine. Especially once SAE tightened the rules in 2005 or 2006, the numbers from manufacturers are much more consistent. It's much harder to pass an "underrated" or "overrated" engines through with the newer regulations. Also, all accessories that are standard equipment on the engine must now be on engine for the test (ex., no leaving out the power steering pump for the test to help boost HP figures).

That said, WHP is the one we care about. However, crank HP can be consistently measured in a very controlled environment (the engine is out of the car). WHP can have a lot of variables, as previously mentioned already in the thread.

Car and Driver article on the subject: http://www.caranddriver.com/columns/...olution-column

Yep, back in the day, I sort of felt "robbed" when they went from gross HP to net HP ..... :sigh:


http://ateupwithmotor.com/terms-tech...et-horsepower/



humfrz