Estimate turbo spool-up time based on turbine size, exhaust energy, and rotor inertia for different driving scenarios.
Input Parameters
Results
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Rotor Inertia Factor
--
Exhaust Energy Factor
--
Est. Spool Time
s
--
Full Boost Engine RPM
rpm
Note: Smaller turbine wheels spool faster (inertia proportional to r^4). Twin-scroll housings and ceramic wheels reduce lag significantly.
Reference
Rotor Inertia Factor = (Turbine Dia / 60)^4
Exhaust Energy Factor = Displacement x RPM / 6000
Spool Time = Base x Inertia / Energy x (Spool RPM / 80000)
Full Boost RPM = Engine RPM + Spool Time x 1500