Shift Point Calculator

Calculate the optimal upshift RPM for maximum acceleration based on engine torque curve and gear ratios.

Input Parameters

Results

--
RPM Drop at Shift
RPM
--
Optimal Shift RPM
RPM
--
Gear Step Ratio
--
Shift Window Start
RPM
Note: For maximum acceleration, shift so that post-shift RPM lands at or above peak torque RPM. Close-ratio gearboxes allow later shifts with less RPM drop. SAE paper 2008-01-0614.

Reference

Gear Step = Current_ratio / Next_ratio RPM after shift = Shift_RPM × Next_gear / Current_gear Optimal Shift ≈ Peak_power_RPM + (Redline − Peak_power) × 0.3 Constraint: Landing RPM must be ≥ Peak_torque_RPM Shift Window = Optimal_shift ± 500 RPM