Turbo Sizer: Compressor Map

Turbo Sizer helps you pick the right turbocharger before you buy. Enter your target horsepower and boost, and it works out the airflow your engine needs, then plots that operating point on a compressor map so you can see where it lands.

Instead of guessing, you get the numbers that matter: how much air your build demands, the pressure ratio you are running, and how close the operating point sits to the surge and choke edges of the map. Dial in ambient conditions and compressor efficiency to see how altitude and heat move the point.

Everything runs fully offline on your iPhone. No account, no sign-in, and no data leaves your device.

Turbo Sizer is free to download. Every tool is open for a 14-day free trial; after that, a single one-time purchase (Full Boost) keeps the calculator, map and comparison tools unlocked for good. No subscription and no ads. If you bought Turbo Sizer 1.0, you already have everything.

FEATURES
- Required mass airflow from target horsepower (BSFC and AFR based)
- Pressure ratio from boost and ambient pressure
- Estimated compressor discharge temperature from efficiency
- Corrected airflow for a fair comparison across conditions
- Operating point plotted on a generic, editable compressor map
- Surge and choke margin readouts for the current point
- Save builds and compare several turbos side by side
- Reference tab explaining every input and formula
- Imperial and metric units, works entirely offline

The map is a generic normalized map you edit with the surge, choke and flow corners of whatever compressor you are evaluating. There are no built-in manufacturer maps.

Results are engineering estimates for planning only. Always verify against the manufacturer's real compressor map before buying.