Intercooler Efficiency Calculator
Calculate charge cooling thermal efficiency, pressure drop, and air density recovery from intercooler inlet and outlet data.
For A2A use Outside Air. For A2W use Water Temp.
At turbo compressor outlet
At intake manifold (IAT)
Testing Tips
- Ensure pressure and temp are logged simultaneously during a single gear pull.
- Heat soak is real. Efficiency on lap 1 out-lap is not the same as lap 10 of a race.
- If ambient temp rises (e.g., following another car in dirty air), thermal efficiency will drastically drop.
Methodology
Thermal Efficiency: (T_turbo - T_manifold) ÷ (T_turbo - T_ambient)
Density Recovery: Considers BOTH the temperature drop (which increases density) AND the intercooler pressure drop (which decreases density) using absolute values (psia and Rankine).
Frequently Asked Questions
Is more pressure drop always bad?
No. High-efficiency cores inherently restrict flow to force air molecules to touch the cooling fins. A 1-2 psi pressure drop is perfectly acceptable if you are getting 85% thermal efficiency. A 0 psi pressure drop means you have a hollow tube — which cools nothing.
Air-to-Air vs Air-to-Water?
A2A relies entirely on vehicle speed pushing ambient air through the core. It heat-soaks standing still. A2W uses chilled water/ice to cool the charge pipe, allowing over 100% thermal efficiency (sub-ambient IATs) for drag racing, but adds weight and complexity.
How do I measure turbo outlet temperature?
Drill and tap the hot-side charge pipe right off the compressor housing and install a fast-acting open-element thermocouple (K-type), wiring it directly to your standalone ECU or data logger.
Disclaimer & Legal Notice
All tools and calculators provided by Lapsite are for informational and educational purposes only. While we strive for mathematical precision, these results are approximations and should not be used as the sole basis for critical engineering, financial, or safety decisions. Lapsite Ltd and its creators provide no warranty, express or implied, regarding the accuracy or fitness of these calculations for any specific use.Always double-check calculations independently, especially for safety-critical components such as brakes, suspension, or structural changes. By using these tools, you agree that Lapsite Ltd is not liable for any mechanical failure, financial loss, or injury resulting from the use of this data.
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