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Gear-Ratio Selection & Shift Maps
Inside this lesson
- Define gear-ratio spread and its relation to vehicle speed range
- Explain how ratios keep the engine in its power band across shifts
- Interpret a shift map (gear vs speed/throttle)
- Contrast economy, sport, and tow shift maps
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Educational content covering topics typical of a first- and second-year automotive engineering curriculum. Not a substitute for accredited coursework, and not suitable for real vehicle design, operation, regulation, or safety decisions without review by a licensed professional engineer. References to WLTP/EPA test cycles, ISO 26262, NCAP/IIHS, or SAE levels are descriptive context only, not compliance, certification, or capability guidance.