Stall Converter Calculator Australia

Stall Speed Formula:

\[ \text{Stall Speed} \approx \sqrt{\frac{HP}{Weight}} \times K \]

Stall Speed (RPM):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Stall Speed?

Stall speed refers to the maximum engine RPM that a torque converter can reach when the transmission is in gear and the brakes are fully applied. It's a critical measurement for performance vehicles in Australia, particularly for drag racing and high-performance applications.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

\[ \text{Stall Speed} \approx \sqrt{\frac{HP}{Weight}} \times K \]

Where:

\( HP \) — Horsepower of the engine
\( Weight \) — Vehicle weight in pounds (lb)
\( K \) — Dimensionless constant that varies based on converter design and application

Explanation: The formula estimates the RPM at which the torque converter will stall based on the power-to-weight ratio of the vehicle, adjusted by a constant factor that accounts for converter characteristics.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for optimal vehicle performance. A correctly matched stall speed allows the engine to operate in its optimal power band during acceleration, improving launch characteristics and overall performance.

4. Using the Calculator

Tips: Enter accurate horsepower and weight values. The K constant typically ranges from 0.8 to 1.2 for most applications - consult your converter manufacturer for the appropriate value for your specific setup.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for street performance applications?
A: For most street performance applications in Australia, a K value between 0.9-1.1 is commonly used, but this can vary based on converter design.

Q2: How does vehicle weight affect stall speed?
A: Heavier vehicles generally require higher stall speeds to overcome inertia, while lighter vehicles can use lower stall speeds for the same horsepower.

Q3: Should I use engine horsepower or wheel horsepower?
A: For most accurate results, use engine horsepower rather than wheel horsepower, as the torque converter operates before the drivetrain losses.

Q4: Can this calculator be used for both petrol and diesel engines?
A: While the formula works for both, diesel engines typically have different torque characteristics that may require adjustment of the K value.

Q5: How accurate is this estimation?
A: This provides a reasonable estimation, but actual stall speed can vary based on converter design, torque curve characteristics, and other factors. Always consult with your converter manufacturer for precise specifications.