HP question..
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HP question..
Ok, got a question.. as Audi claims the 180QC has 180hp at 5500rpm. Is this the number at the wheel? or from the engine? What would be the power 'at' the wheel? whats a rough % loss?
BHP? HP? hmm..
Thanks.
BHP? HP? hmm..
Thanks.
New Member
Joined: Feb 2001
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It stands for: Society of American Engineers. please read on>
Technically the horsepower rating has to be measured from the "crank" or "flywheel"
with all accessories needed to have the motor run unaided in order for it to be "NET HP".
There is also "brake horsepower" which is the actual horsepower from the engine minus the tranny, waterpump, alternator, excetra (measured on a Dynometer for example) In this case it would be called "BHP".
Now I am only speculating on measurement from the rear wheels. More than likely
the horsepower measured really is "NET HP".
I hope this helps a little, it has been quite a few years since I have had to recall information like this so I hope I didn't leave too much out. For the older folks out there you probably remember around 1973 the automobiles suddenly "seemed" to lose quite a bit of horsepower when in reality the automotive manufacturers where measuring by the
"SAE NET HP" instead of "SAE GROSS HP" This left quite a few people scratching their heads wondering where 50 to 80 ponies went galloping off.
And no, HACK TTHS you are not stupid, I just forgot not everyone is an automotive nut
like me.
with all accessories needed to have the motor run unaided in order for it to be "NET HP".
There is also "brake horsepower" which is the actual horsepower from the engine minus the tranny, waterpump, alternator, excetra (measured on a Dynometer for example) In this case it would be called "BHP".
Now I am only speculating on measurement from the rear wheels. More than likely
the horsepower measured really is "NET HP".
I hope this helps a little, it has been quite a few years since I have had to recall information like this so I hope I didn't leave too much out. For the older folks out there you probably remember around 1973 the automobiles suddenly "seemed" to lose quite a bit of horsepower when in reality the automotive manufacturers where measuring by the
"SAE NET HP" instead of "SAE GROSS HP" This left quite a few people scratching their heads wondering where 50 to 80 ponies went galloping off.
And no, HACK TTHS you are not stupid, I just forgot not everyone is an automotive nut
like me.
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If you want the actual HP from the rear wheels there is a better way then this>>>
I remember for a car with an automatic transmission and rear wheel drive, you can figure in as much as a 20% loss in power from SAE NET figures (if you want a rough idea of what HP gets lost/used up in the drivetrain). I don't know for an all wheel drive or "Quattro" what the percentage loss would be.
AudiWorld Super User
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Actually, that's not quite true.....
"Brake" HP is just a way of describing the method in which the HP was measured. Without going through a lot of detail here, and I'm sure that Jon(SmallTTs) can elaborate on this further, but an engine dyno measures flywheel HP by adding resistance, or <b>braking</b>, the flywheel.
Anyway, the important item here, is that, right now, no manufacturer uses drive wheel HP in their claims. All HP figures that you see released by the manufacturers are as measured at the flywheel with accessories in place as you mentioned, but without the rest of the drivetrain.
Anyway, the important item here, is that, right now, no manufacturer uses drive wheel HP in their claims. All HP figures that you see released by the manufacturers are as measured at the flywheel with accessories in place as you mentioned, but without the rest of the drivetrain.
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AudiWorld Super User
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I did read them, but misread one line, sorry dude. But, with respect to American car....
HP ratings.....they do not measure HP at the rear wheels. Right now, no manufacturer does for fear of the public perception of low HP ratings.
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And in my case, it's just way too damn early........
4:30 comes around, can't get back to sleep, nothing but infomercials on, and here I am.....dammit.
Oh well, time to think about skiing since sleep is not going to happen anymore.
Oh well, time to think about skiing since sleep is not going to happen anymore.