Turbo Sizing Calculator
Turbo Sizing Calculator
HBRacing7HB Racing Turbo Sizing Calculator
Enter engine size, RPM, VE, and power goal. The calculator estimates boost pressure, turbine backpressure, and compressor/turbine suggestions.
Unit System
Engine & Power Goal
Imperial: cubic inches (CID). Metric: liters (L).
Typical: 80–90% mild builds, 90–105% aggressive / race combos.
Total flywheel power goal for the engine (flywheel HP).
We size per turbo. A twin setup splits airflow across both units.
Turbo Suggestions
Boost and turbine pressure are approximations for a well-matched turbo at your goal. Always confirm with manufacturer maps and data.
Approx. Boost Needed to Reach Goal
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Estimated pressure ratio: –
Target Turbine Backpressure (EMP)
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EMP:MAP target ratio: –
Suggested Compressor Size Range
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HP per turbo goal: –
Suggested Turbine Housing A/R
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Adjust toward smaller end for spool, larger end for top end.