WHP to HP Calculator

About WHP to HP Calculator:

The WHP to HP calculator converts the wheel horsepower (WHP) to crank horsepower (HP) and vice versa. It factors in the drivetrain loss to provide you with accurate estimations for front-wheel drive (FWD), rear-wheel drive (RWD), and all-wheel drive (AWD) vehicles. It helps you to know the actual power output of your vehicle engine.

How to Use?

Using our calculator is quite simple!

1. Choose whether you want to do a “WHP to HP” or “HP to WHP” conversion
2. Enter the known horsepower
3. Select the drivetrain loss (Front wheel, Rear wheel, or All wheel)
4. Click ‘Calculate’

For example:

For a known WHP of 248 with a drivetrain loss for the Front wheel, the converted HP will be 275.56, as calculated by our who to hp calculator.

Practical Use Cases:

This calculator can be a handy tool for car enthusiasts, tuners, and mechanics under different situations, including:

Estimating Engine Horsepower from Dyno Results:

➡️ Scenario: A vehicle owner has his car dyno-tested that help measure the wheel horsepower. He wants to estimate the crank HP for the car engine.

✔️ Use Case: The person can enter the wheel horsepower (WHP) to HP using the above calculator, considering the nearest drivetrain loss percentage to his vehicle specifications.

Car Performance & Tuning Upgrades:

➡️ Scenario: A tuner wants to quantify the performance gains when making modifications to the engine, such as installing a new intake, exhaust, or turbocharger.

✔️ Use Case: The tuner can compare the WHP values before and after the upgradation. Then, he can input the value in the tool to estimate the corresponding Horsepower (HP). This way, the impact of the changes on engine power can be assessed.

Diagnosing Drivetrain Issues:

➡️ Scenario: A mechanic suspects a drivetrain problem (such as a slipping clutch or worn-out differential), which is causing a significant power loss.

✔️ Use Case: By comparing the estimated engine HP (from factory specs or previous dyno runs) to the measured WHP, the mechanic can calculate the percentage of power loss. A large discrepancy could indicate a drivetrain issue.

Predicting Expected WHP for a Vehicle:

➡️ Scenario: A car manufacturer provides the engine's HP rating. A tuner or enthusiast wants to estimate the expected WHP before conducting a dyno test.

✔️ Use Case: By applying a typical drivetrain loss percentage for the vehicle's configuration (FWD, RWD, AWD), the HP to WHP conversion helps predict the approximate WHP.

Comparing Vehicle Performance:

➡️ Scenario: Car enthusiasts often compare the performance of different cars under different situations.

✔️ Use Case: Using the calculator lets them compare the output crank HP of the vehicles, which helps to compare the efficiency of vehicles.

Predicting Expected WHP for a Vehicle:

➡️ Scenario: Suppose a car company provides you an HP rating for your vehicle, and you want to estimate WHP before conducting a dyno test.

✔️ Use Case: Our tool also works as hp to who calculator, which lets you instantly convert the provided HP to corresponding WHP for your car.

Formulas & Examples:

WHP to HP Conversion:

The equation is as follows:

\(HP = \frac{WHP}{(1 - DL)}\)

Where,

• HP - Horsepower
• WHP - Wheels Horsepower
• DL - Drive Train Loss

Worked Example:

Let's say you have a car with a WHP of 250 and a drivetrain loss (DL) of 15%!

To find the HP, you have to plug these values into the formula:

\(HP = \frac{250}{(1-0.15)}\)

Now, calculate inside the parentheses first:

\(1 - 0.15 = 0.85\)

Now, divide WHP by 0.85:

\(HP = \frac{250}{0.85}\)

\(HP = 294.12\)

So, the car's HP is approximately 294.12 when you have a WHP of 250 and a drivetrain loss of 15%. You can also try the WHP to HP calculator for such calculations pertaining to different values.

HP to WHP Conversion:

The formula is as follows:

\(WHP = \frac{EHP}{DTLF}\)

Where,

• WHP - Wheels Horsepower
• EHP - Engine Horsepower
• DTLF - Drive Train Loss Factor

Worked Example:

Imagine you have a high speed sports car with an EHP (Engine Horsepower) rating of 300 HP (Horsepower). The car's manufacturer states that the DTLF (Drivetrain Loss Factor) is 10%.

Now, let's calculate the WHP by using its formula:

\(WHP = \frac{EHP}{DTLF}\)

First, put the values to the equation:

\(WHP = \frac{300}{0.10}\)

Now, calculate the division:

\(WHP = \frac{300}{0.10} = 3000\)

So, in this real-life example, the Wheel Horsepower (WHP) of your sports car is approximately 3000 when you have an Engine Horsepower (EHP) of 300 HP and a Drivetrain Loss Factor (DTLF) of 10%. This represents the actual power that reaches the wheels and moves the car.

Drive Train Loss Chart:

Wheel Horsepower (WHP) to Crank Horsepower (HP) Conversion

Crank Horsepower (HP) to Wheel Horsepower (WHP) Conversion

FAQs:

Why is it called horsepower?

It's called "horsepower" because it was originally created to compare the power of early engines to the work a horse could do. It was named after horses because they were commonly used for work. This made it easier for people to understand how powerful these machines were by comparing them to something familiar, like a horse's strength.

Is 1 HP equal to a horse?

No, 1 HP (Horsepower) is not equal to one real horse. It's just a unit of measurement invented by James Watt in the late 18th century to describe how powerful machines are compared to the work a horse could do. It's a way to quantify engine power in terms that people can relate to, but it doesn't mean 1 HP is the same as having a horse.

References:

Wikipedia.org: Horsepower, History, and WHP.