467hp vs 471hp
07-28-15, 12:53 PM
#2
The most common use of HP, as a unit, is to measure the power of an engine, which you can determine by hooking it to a dynamometer. What HP actually measures, is the maximum rate of acceleration and the top speed of the car.
On the other hand, Brake Horsepower measures the HP of an engine without considering the loss in power that is caused by some parts of the engine, like the generator, gearbox, water pump and other auxiliary parts.
467HP vs 471 BHP
On the other hand, Brake Horsepower measures the HP of an engine without considering the loss in power that is caused by some parts of the engine, like the generator, gearbox, water pump and other auxiliary parts.
467HP vs 471 BHP
07-28-15, 12:57 PM
#3
Lexus Test Driver
There is a third number out there as well - 477 HP
This is DIN HP (or PS). It is most commonly used in Japan and some European markets.
This is DIN HP (or PS). It is most commonly used in Japan and some European markets.
07-28-15, 01:03 PM
#4
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The most common use of HP, as a unit, is to measure the power of an engine, which you can determine by hooking it to a dynamometer. What HP actually measures, is the maximum rate of acceleration and the top speed of the car.
On the other hand, Brake Horsepower measures the HP of an engine without considering the loss in power that is caused by some parts of the engine, like the generator, gearbox, water pump and other auxiliary parts.
467HP vs 471 BHP
On the other hand, Brake Horsepower measures the HP of an engine without considering the loss in power that is caused by some parts of the engine, like the generator, gearbox, water pump and other auxiliary parts.
467HP vs 471 BHP
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10-17-15, 11:29 AM
#8
You're describing RWHP, and that difference is not 4 or 10 HP man. It's usually about 15% difference, due to drivetrain losses, but varies a lot with each car. Those small differences are just different methods of measuring CRANK HP. The US method (BHP) is the least artificial, and requires using all engine accessories, plus stock intake and exhaust systems. But result is still adjusted for ideal conditions (zero elevation, perfect temperature -68ºF, I believe-, no humidity, etc). Hardly realistic.
Last edited by JCtx; 10-17-15 at 11:38 AM.
10-17-15, 12:49 PM
#10
Indeed; no other way to measure it
. Didn't sound like he was talking about that, hence my comment. But thank you for further clarification. The difference in numbers is HOW the engine is set up. The 477 figure doesn't use a stock exhaust, including no catalytic converters, I believe. The 471 uses a non-stock exhaust manifold, but with cats, I think. All use all engine accessories and stock intake/ECU nowadays. And all correct to ideal conditions as well, just like most chassis dyno figures everywhere. I'd be nice if an expert out there could set the record straight, and point out the exact differences
.
. Didn't sound like he was talking about that, hence my comment. But thank you for further clarification. The difference in numbers is HOW the engine is set up. The 477 figure doesn't use a stock exhaust, including no catalytic converters, I believe. The 471 uses a non-stock exhaust manifold, but with cats, I think. All use all engine accessories and stock intake/ECU nowadays. And all correct to ideal conditions as well, just like most chassis dyno figures everywhere. I'd be nice if an expert out there could set the record straight, and point out the exact differences.
Last edited by JCtx; 10-17-15 at 12:53 PM.
10-18-15, 07:57 AM
#11
Lexus Champion
Easy answer. The US spec car has to take into account all of the stupid CAFE and EPA emissions garbage which puts more drag on the motor and reduces power.
Other countries don't have that garbage dragging down the motor.
Other countries don't have that garbage dragging down the motor.
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