Boost / FI HP Estimator
Estimate horsepower from boost pressure and base HP. Includes intercooler efficiency, minimum octane requirements, and safe compression ratio limits.
Quality FMIC; covers most street builds
Fuel:
Est. Boosted HP
571
HP Gain
+171
Pressure Ratio
1.68:1
Min. Octane Requirement
91+ AKI
91 premium
Max Safe CR (Pump 93)
9.5:1
Octane Requirements by Boost Level
0–6 PSI87Low boost OK on regular with stock-ish CR
7–10 PSI91–92Premium required; watch for knock
11–14 PSI9393 pump max; intercooler strongly advised
15–20 PSI100 / E85Race fuel or ethanol blend recommended
20+ PSI110+ / methanolRace-only; dedicated fueling system
Estimate uses: HP_est = Base HP × ((boost + 14.7) / 14.7) × intercooler efficiency. Real-world gains depend on engine VE, camshaft, head flow, and tuning. Compression limits are conservative street guidelines — not absolute maximums.