What's the difference between turbocharger and supercharger boost?
Turbochargers use exhaust gases to compress air, while superchargers are belt-driven by the engine. Both create boost pressure, but superchargers provide immediate response while turbos are more efficient at higher RPMs.
How much HP gain can I expect per PSI of boost?
Generally, you can expect 6-8% horsepower increase per PSI of boost. A 300 HP engine with 10 PSI boost might gain 180-240 HP, depending on efficiency and engine design.
What is atmospheric pressure and why does it matter?
Atmospheric pressure is the natural air pressure at your location (14.7 PSI at sea level). Higher altitudes have lower pressure, affecting the calculation of total pressure ratio and power output.
What affects forced induction efficiency?
Efficiency depends on intercooler effectiveness, piping design, turbo/supercharger quality, and engine tuning. Well-designed systems achieve 85-90% efficiency, while basic setups may only reach 75-80%.
Is there a limit to how much boost I can run?
Yes, engine internals, fuel system, and cooling capacity limit boost levels. Most stock engines safely handle 6-10 PSI, while built engines can handle 15-30+ PSI depending on construction.
Do I need to upgrade internals for boost?
It depends on boost level and base engine strength. Low boost (5-8 PSI) may be safe on stock engines, while higher boost typically requires forged pistons, stronger rods, and upgraded fuel systems. You might also find our Volumetric Efficiency Calculator useful.