1. What is the Tremec RPM Equation?

The Tremec RPM equation calculates engine revolutions per minute (RPM) based on vehicle speed and tire circumference. This is particularly useful for gear ratio calculations and transmission tuning.

2. How Does the Calculator Work?

The calculator uses the Tremec RPM equation:

Where:

• \( speed\_mph \) — Vehicle speed in miles per hour
• \( tire\_circ \) — Tire circumference in inches
• 336 — Constant conversion factor (combines unit conversions and π)

Explanation: The equation converts linear speed to rotational speed accounting for tire size.

3. Importance of RPM Calculation

Details: Accurate RPM calculation is crucial for proper gear selection, transmission tuning, and understanding engine performance at different speeds.

4. Using the Calculator

Tips: Enter vehicle speed in mph and tire circumference in inches. Measure tire circumference by marking the ground and rolling the tire one full revolution.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire circumference?
A: Mark the ground and tire, roll the vehicle forward until the mark makes one complete revolution, then measure the distance traveled.

Q2: What's the 336 constant?
A: It combines unit conversions (5280 ft/mile, 12 in/ft, 60 min/hour) and divides by π (≈3.1416).

Q3: Does this account for gear ratios?
A: No, this calculates driveshaft RPM. For engine RPM, multiply by final drive ratio.

Q4: How accurate is this calculation?
A: Very accurate if tire circumference is measured precisely. Tire wear and pressure affect actual circumference.

Q5: Can I use this for metric units?
A: The equation is designed for mph and inches. For km/h, use 208.86 instead of 336.