Money Shifting The 2023 Nissan Z - What Happens?!

Summary by Krater

This video examines the mechanics and consequences of money shifting a manual transmission vehicle, focusing on engine over-revving, valve float, and valve-piston interference. It concludes that mismatched gear ratios during a mis-shift can dramatically exceed the engine's design limits and cause catastrophic engine damage.

From the video

Answers: What happens when you money shift a manual transmission car?

• Money shifting mechanics
• Transmission gear ratios
• Engine redline limits
• Valve float and interference engines
• Piston speed calculations
• Manual transmission lockout and skip-shift

What it concludes

• Money shifting a car into a lower gear than intended forces the engine RPM well past its redline, leading to severe mechanical stress.
• Higher gear ratio gaps between mis-shifted gears result in significantly higher over-rev speeds and greater engine damage potential.
• Exceeding the engine design RPM limits causes valve float, where springs can no longer control valve motion, leading to potential valve and piston contact in interference engines.
• Average piston speeds during severe money shifts can exceed the limits of production cars, reaching destructive velocities.
• Technologies like reverse gear lockouts and GM skip-shift can prevent certain mis-shifts, but mechanical solutions to prevent money shifts are largely unavailable.