Stall Converter Rpm Calculator

Stall Speed Formula:

\[ \text{Stall Speed} \approx K \times \sqrt{\text{torque}} \]

Stall Speed:

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1. What is the Stall Converter RPM Calculator?

The Stall Converter RPM Calculator estimates the approximate stall speed for a torque converter based on the K-factor and engine torque. Stall speed is the maximum RPM an engine can reach when the transmission is in gear and the brakes are fully applied.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

\[ \text{Stall Speed} \approx K \times \sqrt{\text{torque}} \]

Where:

\( K \) — K-factor (rpm/√lb-ft), a characteristic of the torque converter
\( \text{torque} \) — Engine torque in lb-ft

Explanation: The formula approximates the stall speed by multiplying the K-factor by the square root of the engine torque. Different torque converters have different K-factors based on their design and stall characteristics.

3. Importance of Stall Speed Calculation

Details: Proper stall speed calculation is crucial for optimizing vehicle performance, especially in racing applications. It helps match the torque converter to the engine's power band for maximum acceleration off the line.

4. Using the Calculator

Tips: Enter the K-factor (typically provided by the torque converter manufacturer) in rpm/√lb-ft and the engine torque in lb-ft. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K-factor range?
A: K-factors typically range from 15-25 rpm/√lb-ft for street performance converters and 25-35+ rpm/√lb-ft for racing converters.

Q2: How does stall speed affect vehicle performance?
A: Higher stall speeds allow the engine to operate in its optimal power band during launch, improving acceleration but potentially reducing fuel efficiency.

Q3: Can I use this calculator for any torque converter?
A: This provides an approximation. Actual stall speed may vary based on converter design, fluid dynamics, and other factors.

Q4: What if I don't know my torque converter's K-factor?
A: Contact the manufacturer or consult the product specifications. K-factor is typically provided for performance torque converters.

Q5: How accurate is this calculation?
A: This provides a reasonable approximation but actual stall speed may vary by ±100-200 RPM due to various factors including converter efficiency and engine characteristics.