When it comes to enhancing your vehicle’s performance, few modifications deliver as much return on investment as an efficient charge air cooling system. For forced-induction engines—whether turbocharged or supercharged—reducing intake air temperature is critical for achieving reliable power gains and preventing detonation. An Aeromotive air to water intercooler stands out as a proven solution, offering a compact, high-performance package that can unlock 60+ horsepower on many builds. This article explores how these systems work, why they outperform traditional air-to-air coolers in many applications, and what you need to know to get the most from your upgrade.

What is an Aeromotive Air to Water Intercooler?

An Aeromotive air to water intercooler (also known as a water-to-air intercooler) is a charge air cooling system that uses liquid as the primary heat transfer medium instead of ambient airflow. Unlike the large, front-mounted air-to-air coolers common on production turbo cars, an air-to-water system places a compact intercooler core close to the engine. Water and coolant are circulated through that core and then pumped to a remote heat exchanger (often mounted at the front of the vehicle) where the heat is released. This design allows for:

  • Shorter intake tract – reduced lag and better throttle response.
  • Lower pressure drop – because the core can be larger in cross-section without sacrificing aerodynamics.
  • Flexible packaging – ideal for engine bays where a large air-to-air unit won’t fit.
  • Consistent performance – less susceptible to heat soak during stop-and-go driving or on the dyno.

Aeromotive’s lineup includes bar-and-plate cores built for extreme durability and heat rejection efficiency, with tig-welded end tanks and O-ring sealed connections to handle high boost pressures. Their systems are designed to integrate seamlessly with aftermarket engine management and high-flow water pumps, making them a favorite among street and strip enthusiasts.

How Does It Work?

At its core (pun intended), an air to water intercooler is a simple heat exchanger. Hot, compressed air from the turbo or supercharger flows through the intercooler core while water simultaneously flows through separate passages. Because water has a >4x higher specific heat capacity than air, it can absorb a large amount of heat very quickly. The heated water then travels to a front-mounted heat exchanger (similar in appearance to a radiator), where ambient air cools the liquid before it returns to the reservoir and pump.

This separates the intake air cooling into two stages:

  1. First pass – heat transferred from charge air to water inside the intercooler core.
  2. Second pass – heat transferred from water to ambient air at the front heat exchanger.

The result is cooler, denser intake air entering the engine. For every 10°F drop in intake air temperature, you can typically see a 1% gain in horsepower. If a stock air-to-air system sees charge temps of 180–200°F at full boost, a properly sized Aeromotive air to water unit can drop that to 120–140°F or lower, yielding an instant power increase. Many builders report 50–80 whp gains when upgrading from undersized or restrictive air-to-air systems.

Components of an Air to Water Intercooler System

An Aeromotive kit typically includes five main components, each designed for maximum flow and durability:

  • Intercooler core – the central heat exchanger that sits between the intake and throttle body. Choose from bar-and-plate or tube-and-fin depending on flow requirements.
  • Water reservoir – holds coolant (usually distilled water with a corrosion inhibitor or water wetter). Size varies; some builds use an ice box for drag racing.
  • Water pump – a quality pump (e.g., Bosch or Davies Craig) ensures adequate flow rate to keep the core saturated. Aeromotive recommends pumps rated for at least 20 GPM on high-horsepower setups.
  • Heat exchanger – the front-mounted radiator-like unit that dissipates heat from the water. Size and fin density affect cooling capacity.
  • Hoses and fittings – silicone or rubber lines and anodized aluminum fittings for leak-free connections. Many kits include pre-formed hoses for common engine swaps.

Benefits of Using an Aeromotive Air to Water Intercooler

Upgrading to an Aeromotive system provides distinct advantages over air-to-air coolers, especially in high-performance street and track applications. Here are the key benefits:

  • Real horsepower gains of 60+ hp – In many Dyno tests, switching from a restrictive or heat-soaked air-to-air unit to an Aeromotive air to water setup frees up 50–80 hp at the wheels. Gains come from cooler charge air and reduced pressure drop.
  • Faster transient response – Because the core can be mounted right at the intake manifold, intake volume is minimized, reducing turbo lag and improving throttle response.
  • Consistent output in traffic – Air-to-water systems maintain intake temps better during low-speed driving because the water has thermal mass and the pump keeps circulating; air-to-air units heat soak quickly without airflow.
  • More efficient packaging – No need to run long, convoluted charge pipes to a front-mount core. This frees up space for fans, ducting, or even an accessory drive.
  • Easier ice-water charge cooling – For drag racers, swapping the water in the reservoir for ice water can drop charge temps another 30–50°F, delivering massive gains on the strip.
  • Higher boost potential – With less pressure drop and better knock resistance, you can safely run higher boost levels without pulling timing.

Choosing the Right Intercooler for Your Application

Selecting the correct Aeromotive air to water intercooler involves matching core size, thickness, and flow characteristics to your engine’s output. Key factors include:

Core Volume and Density

Core volume should correlate with your horsepower target. A rough rule of thumb: 1 liter of core volume per 100–150 hp. However, efficiency also depends on fin density and internal flow path. Aeromotive offers cores from 4” x 12” x 3” up to 6” x 18” x 4” to accommodate everything from 400 hp LS swaps to 1,500+ hp turbo V8s.

Bar-and-Plate vs. Tube-and-Fin

Bar-and-plate cores (like Aeromotive’s signature line) offer superior heat transfer and strength, making them ideal for high boost (30+ psi). Tube-and-fin cores are lighter and can provide lower pressure drop, but they’re more prone to damage and less efficient at rejecting heat. For serious performance, bar-and-plate is the standard.

Water Flow Rate

The pump must move enough water to keep the core saturated, especially at idle where heat soak is worst. Aeromotive recommends a minimum of 15 GPM when using their cores; 25+ GPM is common on race setups. Undersize pumps lead to localized boiling and inconsistent cooling.

Heat Exchanger Sizing

Front heat exchanger surface area should be at least twice the core face area. For a typical street car, a 12” x 18” x 2” exchanger works well. For track use, consider a dual-pass design or a larger unit with high fin density.

If you’re unsure, Aeromotive’s product page includes detailed specs and application guides. Many aftermarket suppliers also offer advice based on your specific chassis and power goals.

Installation Considerations

While the installation can be done in a weekend with moderate mechanical skills, a few critical details determine long-term reliability and performance:

  • Pump placement – Mount the pump below the water level in the reservoir to ensure self-priming. Use anti-cavitation lines to prevent air lock.
  • Reservoir location – Install the reservoir at the highest point in the system to allow air to escape. A vented cap helps.
  • Bleeding the system – After filling, run the pump with the reservoir cap off until no air bubbles emerge. This prevents vapor pockets that reduce flow.
  • Hose routing – Keep hose lengths as short as possible and avoid sharp bends. Use 1” ID hoses for the main loop on systems over 600 hp; ⅝” minimum for lower power.
  • Freeze protection – If you live in a cold climate, use a 70/30 water-to-ethylene glycol mix or drain the system before winter to avoid split cores.

For a detailed walkthrough, many enthusiasts share their builds on forums like LS1Tech and TurboMustangs, where you can see how others routed the system in tight engine bays.

Maintenance and Longevity

An Aeromotive air to water intercooler system requires minimal upkeep, but neglecting maintenance can lead to performance loss or component failure:

  • Check water level monthly – Evaporation through the vented cap is normal; top up with distilled water and a small amount of water pump lubricant.
  • Inspect hoses and clamps – After the first few heat cycles, silicone hoses can soften, causing clamps to loosen. Retighten after 500 miles and then annually.
  • Clean the core fins – Use compressed air or a gentle water spray to remove debris that blocks air passage through the core. Avoid high-pressure washers near the fins.
  • Flush the coolant every 2 years – Sediment and corrosion inhibitors degrade. Replace with fresh distilled water plus a corrosion inhibitor (Red Line, Evans, or similar).
  • Monitor engine temps – A sudden spike in intake air temperature (IAT) at full boost often indicates a failing pump or low water level. Invest in a temperature sensor and gauge.

Real-World Performance Gains

The 60+ hp claim is not marketing fluff—it’s backed by numerous dyno tests and real-world builds. For instance, a popular test showed a 65 whp gain on a 600 hp LS swap when switching from a small air-to-air cooler to an Aeromotive bar-and-plate air-to-water system. The improvement came from a 35°F drop in IAT and a reduction in pressure drop from 2.5 psi to under 0.8 psi at 18 lb boost. In another case, a 1,000 hp Supra owner reported 80+ hp after fitting an Aeromotive core with a high-flow pump and an ice box for summer drag racing.

To see technical details and dyno charts, EngineLabs has a thorough article on the physics behind air-to-water cooling. You can also browse vehicle-specific results on Yellow Bullet (a popular racing forum) where users openly share their build data.

Conclusion

An Aeromotive air to water intercooler presents a compelling upgrade for anyone serious about extracting maximum power from a forced-induction engine. The ability to lower intake air temperatures, reduce pressure drop, and package the core closer to the engine translates directly into real-world gains—often 60+ horsepower or more. With robust construction, thoughtful engineering, and a clear upgrade path from street to all-out race applications, it’s an investment that pays off in both dyno numbers and driving excitement. Whether you’re building a daily driver that sees track time or a dedicated drag car, an Aeromotive system provides the cooling headroom needed to run higher boost with confidence.