It does not count the power loss caused by the drivetrain and gearbox. The BHP is teh aftermath of aplying a brake torque to the engine. Some people call it Crank or Flywheel horsepower but these terms are not quite similar. Wheel horsepower is measured at the wheels. It refers to the actual power available for the acceleration of the car minus the power loss in the drivetrain and all types of parasitic losses including power draining by the alternator, fans, pumps, muffled exhaust, and some other accessories.
In fact, it is the true horsepower that goes into the driving wheels. The DIN was the standard in Europe for measuring the brake horsepower. It tests the power of an engine that has connections to all ancillaries and exhaust system that a vehicle has. According to the older American standard, BHP is the power of an engine minus the power of the water pump, alternator, and auxiliary components including muffled exhaust system, power steering pump, and other related parts.
But, the new American standard counts the engine power along with all the ancillary accessories. For this reason, the BHP of the same car will be the same measured in European and new American standards. The two are the same, and they measure horsepower at the flywheel or crankshaft. A thing to note about the HP vs. When looking at the engine power, you have the one the manufacturer indicates to you.
This is the horsepower, and, as earlier mentioned, it does not account for factors like drivetrain loss and friction. On the other hand, the wheel horsepower will account for these variables and show you the energy on your wheels.
It is the value to consider to know how much power the car uses in motion. The drivetrain loss comes due to the vast effort of the engine to transmit energy to the wheels. For instance, from the engine, differentials, the prop shaft, drive shafts, then to the wheels. It is too much effort, and you will lose significant energy values.
Back to the calculation, there is the point of the drivetrain you are using and how it determines your HP to WHP value. Accounting for the loss, we will multiply it by , then divide by for the percentage. The final value is BHP.
However, 1 Horsepower is equal to 1. This value is the power coming from the engine. In this case, it is 0. It is usually less than the HP due to drivetrain loss, mostly caused by friction. There are different kinds of horsepower, such as the wheel, the braking, and crankshaft horsepower. You will find that the most powerful engines have the higher horsepower.
When the transmission system relays power from the crank or flywheel to the wheels, some of it gets lost. An automatic transmission will drain up to horsepower in the engine output, mostly due to torque converter slippage.
The value is relatively low with manual transmission vehicles. Running the hydraulic pressure pump also contributes to energy loss. On the HP vs. No, the transmission does not increase horsepower; instead, it may reduce it. It is more of a stabilizer as it relays energy from the engine to the wheels. However, modifications to the transmission unit can help increase speed or improve acceleration power.
Benefits of this are many, but the primary and most obvious is the lack of squishy tyre and lack of traction through them, particularly on big power cars. Having a mechanical connection to the car gives us repeatability and the ability to measure over wheel horsepower without shredding a brand new set of tyres. Which is important, it gives us mechanical accuracy that cannot be improved upon.
To give a BHP figure, we would have to take this accurate, measured number and multiply it by an estimated transmission loss value. As it is impossible to know precisely how much energy was lost turning the driveline because the figure will change from car to car yes, even two 'identical' brand new cars this 'transmission loss value' can only be estimated.
Unless you were to remove the engine from the car, test its power on an engine dyno before refitting it back into the car for a power test on a chassis dyno you DO NOT know how much power was lost through the drivetrain - as you might imagine, removing engines for a simple power test is somewhat impractical in the real world.
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