Performance Calculator
Turbo Boost HP Calculator
Thinking about forced induction? Estimate the horsepower you'd gain from a given boost level using the pressure-ratio method, with an efficiency factor for real-world losses.
Engine & Boost
Baseline crank horsepower with no boost.
Accounts for heat and volumetric losses. ~85–92% with a good intercooler.
Ambient pressure drops with elevation, slightly changing the ratio.
Estimated Boosted HP
a gain of +66 hp over stock
Power Gain
+66 hp
% Increase
+33%
Pressure Ratio
1.48
Theoretical Max HP
295 hp
Reality check
This is an idealized estimate. Real gains depend on fueling, tuning, exhaust flow, and how much boost the engine can safely handle before internals become the limit.
How it works.
Frequently asked questions.
Is more boost always more power?
Up to a point. Power rises with the pressure ratio, but heat, detonation limits, and airflow bottlenecks cap the useful boost. Beyond the engine's safe threshold, more boost mostly adds risk of damage rather than reliable power — which is why tuning and supporting mods matter.
Why is the efficiency factor below 100%?
Compressing air heats it, which reduces density, and no turbo system is perfectly efficient. A good intercooler recovers much of that loss, so real gains land at roughly 85–92% of the theoretical pressure-ratio number rather than the full amount.
Does altitude change the result?
Yes, slightly. At higher elevation ambient pressure is lower, so the same gauge boost represents a larger pressure ratio relative to thinner air. Forced-induction cars lose far less power at altitude than naturally-aspirated ones for this reason.