Engineering tool
Engine & Turbo Airflow Calculator
Model boost, compressor outlet temperature, and airflow across the RPM range to estimate power and torque before anything is built — the same volumetric-efficiency and isentropic compression relations we use to size intakes, manifolds, and intercoolers.
Engine & ambient
RPM points
Virtual dyno
Power
Peak 601 hp @ 6,000 rpmTorque
Peak 582 lb-ft @ 5,000 rpmResults
| RPM | MAP (psi) | PR | Comp out (°F) | MAT (°F) | Airflow (lb/min) | Corrected flow (lb/min) | Fuel (lb/hr) | Power (hp) | Torque (lb-ft) |
|---|---|---|---|---|---|---|---|---|---|
| 2,000 | 14.70 | 1.00 | 75 | 75 | 11.13 | 11.29 | 53.4 | 124 | 326 |
| 3,000 | 19.70 | 1.34 | 142 | 95 | 22.84 | 23.16 | 109.6 | 244 | 427 |
| 4,000 | 28.70 | 1.95 | 227 | 121 | 42.41 | 43.00 | 212.0 | 442 | 580 |
| 5,000 | 28.70 | 1.95 | 223 | 119 | 53.12 | 53.87 | 277.1 | 554 | 582 |
| 6,000 | 28.70 | 1.95 | 231 | 122 | 59.95 | 60.79 | 312.8 | 601 | 527 |
| 7,000 | 26.70 | 1.82 | 226 | 120 | 61.42 | 62.28 | 320.5 | 583 | 437 |
This estimator uses ideal-gas volumetric-efficiency airflow, isentropic compression with an efficiency correction for compressor outlet temperature, and BSFC-derived power/torque — the same relations used to size intakes, manifolds, and intercoolers. For turbo selection, plot each row's pressure ratio against corrected flow (mass flow referenced to standard 60°F / 14.7psi compressor-inlet conditions) on a candidate compressor's map — if every point sits inside the efficiency islands across your RPM range, it's a viable match. This tool doesn't use compressor or turbine map data itself, so treat it as a sizing estimate, not a substitute for a real dyno pull or the manufacturer's published map.
Turning these numbers into a real intake or manifold? Let's scope it.