Intercooler Sizing Calculator

Compressing a gas does real thermodynamic work on it, and that work has to go somewhere -- for an adiabatic (no heat exchanged with the surroundings during the brief compression event) process, it goes into raising the gas's internal energy, which shows up as a temperature increase. This is the same effect that makes a bicycle pump warm up during use; a turbo or supercharger compressor does the same thing to intake air, just at a much larger scale and higher pressure ratio.

Power ultimately comes from the mass of oxygen (and fuel) burned per cycle, not from pressure alone -- and air density is inversely proportional to its absolute temperature at a given pressure. Hotter charge air is less dense, so the same cylinder volume traps less air mass even though the boost gauge reads the same PSI, which is exactly why intercooling improves power at a fixed boost level rather than only mattering for detonation safety.

Higher boost pressure produces a larger compressor-outlet temperature rise to begin with (via the adiabatic compression relationship), so there's a bigger hot-to-cold temperature gap for the intercooler to work with. A fixed percentage effectiveness removes a larger ABSOLUTE number of degrees from that bigger gap, which is why intercooling matters increasingly more as boost pressure climbs -- a marginal intercooler that's adequate at low boost can become a real bottleneck at higher boost levels.

Treat them as sizing estimates for comparing options, not exact specifications -- core volume here uses a simplified rule-of-thumb ratio to airflow rather than a manufacturer's core-specific flow and pressure-drop data, and real core selection also depends on core thickness, fin density, and end-tank design. Cross-check against a specific intercooler manufacturer's flow bench data or sizing chart before committing to a purchase for a serious build.