Introduction

Installing an air-to-water intercooler on a 1000 HP race engine demands precision, proper tools, and an understanding of how the intercooler integrates with the engine’s forced induction and cooling systems. The APS air-to-water intercooler is a high-flow, low-pressure-drop unit designed to handle extreme heat loads. This expanded guide covers every step from preparation through final testing, with practical tips for achieving a leak-free, high-performance installation. Whether you are a professional engine builder or an experienced racer, follow these instructions to maximize your intercooler’s effectiveness.

Required Tools, Materials, and Safety Equipment

Having the correct tools and materials on hand prevents delays and ensures proper assembly. Beyond the APS intercooler kit, you will need the following:

  • APS air-to-water intercooler kit – includes the intercooler core, brackets, bolts, silicone hose couplers, and basic hardware.
  • Metric and SAE wrench set – deep sockets, combination wrenches, and ratchets for bolts in tight engine bays.
  • Torque wrench – 3/8-inch drive, capable of 10–50 ft-lb for accurate bolt tightening.
  • Hose cutters or a sharp utility knife – for trimming silicone hoses to length.
  • Constant-torque clamps (T-bolt style) – recommended over worm-gear clamps for high-pressure systems; most APS kits include them.
  • Coolant – use a high-quality racing coolant or a mixture of distilled water and water wetter (per manufacturer specs).
  • Catch container, rags, and funnel – for draining old coolant and refilling.
  • Drill and step bits – if you need to enlarge or add mounting holes for the brackets.
  • Deburring tool or fine file – to smooth any sharp edges after drilling.
  • Measuring tape and level – to check intercooler alignment relative to the engine and chassis.
  • Safety goggles, heavy-duty gloves, and shop rags – always protect eyes and skin from debris, hot coolant, and sharp edges.

Check the APS kit contents against the packing list. If any components are missing or damaged, contact the supplier before starting the installation.

Pre-Installation Preparation

1. Work Area and Vehicle Setup

Place the vehicle on a level, well-ventilated surface. Disconnect the battery’s negative terminal to prevent accidental shorts or fan activation. Allow the engine to cool completely – touching hot exhaust manifolds or coolant lines can cause burns. Raise the car on jack stands if you need access underneath for hose routing or bracket mounting.

2. Drain the Cooling System

If your engine already has a coolant loop that will connect to the intercooler (common in air-to-water setups), drain the system first. Locate the radiator drain cock or low point on the block and capture the old coolant in a suitable container. Dispose of it according to local regulations. Opening the system prevents coolant from spilling when you disconnect hoses later.

3. Remove Obstructions

Air intake plumbing, charge pipes, and sometimes the front bumper or radiator support may need to be temporarily removed to access the intercooler mounting area. Label any removed components and store fasteners in separate bags. Photograph the configuration before disassembly to aid reassembly.

4. Review Manufacturer Instructions

Even if you are an experienced installer, read the APS instruction manual thoroughly. Pay special attention to torque specifications, hose routing diagrams, and any model-specific notes for your engine platform. The manual will also indicate whether the intercooler requires a dedicated coolant pump or a separate heat exchanger – many race setups integrate with an ice tank or a front-mounted radiator core.

Removing the Existing Intercooler

Disconnecting the Old Unit

Carefully remove the existing intercooler (whether air-to-air or a previous air-to-water unit). Start by loosening the hose clamps on the inlet and outlet pipes. Slide the hoses off and plug the pipe ends with a clean rag to keep dirt out. Next, unbolt the intercooler mounting brackets. If bolts are seized, apply penetrating oil and allow it to soak before attempting removal. Keep all old brackets and hardware until you confirm that the APS kit replaces them completely.

Inspecting and Cleaning the Mounting Surface

Once the old intercooler is out, inspect the mounting area for corrosion, paint flakes, or debris. Use a wire brush or a solvent-soaked rag to clean the surface. If the vehicle has seen extensive track use, check for cracks or distortion in the chassis attachment points. A clean, flat surface ensures the APS intercooler sits square and its brackets do not induce stress.

Preparing the Mounting Area

Modifications and Fitment

Test-fit the APS intercooler in its intended location. Hold it in place and evaluate clearance to the engine block, radiator, fan shroud, and charge piping. Many 1000 HP setups require the intercooler to be mounted as close to the intake manifold as possible to reduce volume between the intercooler and engine. Use a measuring tape and level to ensure the intercooler is parallel to the chassis and not leaning left or right. Mark the bracket bolt holes with a felt-tip pen or center punch.

Drilling and Smoothing

If your engine bay lacks pre-drilled mounting holes, use the APS brackets as a template. Start with a small pilot bit and gradually enlarge the hole to the specified diameter. After drilling, deburr each hole with a file or deburring tool to prevent stress risers. Apply a dab of anti-corrosion primer or paint to exposed metal edges.

Installing the APS Air-to-Water Intercooler

Positioning the Intercooler

Place the intercooler into the mounting location. Confirm the inlet and outlet ports are oriented correctly – they should face the direction of your charge piping and coolant lines. For example, on a typical front-engine, rear-mount setup, the water inlet is on the lower side to aid bleeding, while the charge air inlet and outlet align with the turbo discharge and throttle body.

Securing the Brackets

Attach the supplied mounting brackets to the intercooler using the provided bolts. Do not fully tighten yet – leave them loose enough to adjust the intercooler’s angle. Then position the brackets against the corresponding chassis or engine mounting points. Install the bolts and snug them by hand. Once you are satisfied with alignment (check clearance around all edges), tighten all bolts with a torque wrench to the specification in the APS manual – typically 20–30 ft-lb for M8 hardware. Use a drop of medium-strength thread locker on any bolts that will see vibration from high-rpm operation.

Final Alignment Check

Re-check that the intercooler does not contact any moving parts (fan blades, belt, or accessory drive). Also verify that there is at least 1/4 inch of clearance around silicone hose connections so that hoses can be slipped on and clamped without obstruction.

Hose Routing and Connections

Charge Air Hoses

Air-to-water intercoolers sit in the charge air path between the turbo and the throttle body. Use the supplied silicone hoses to connect the compressor outlet to the intercooler inlet, and the intercooler outlet to the throttle body. Cut hoses to length with a sharp knife so the ends are clean and square. Slide T-bolt clamps over the hose before pushing it onto the intercooler barb or bead-lock. Tighten clamps to 4–6 Nm (35–55 in-lb) – enough to prevent leaks without distorting the silicone or cutting into the hose.

Coolant System Integration

The “water side” of the intercooler must connect to a coolant circuit. For a race engine, this often includes a dedicated pump (e.g., a Davies Craig or Bosch pump), a reservoir, and a heat exchanger (radiator core or ice tank). Route the coolant hoses so they are away from hot exhaust components. Use spring-type wire-reinforced hose for suction lines on the pump inlet to prevent collapse. Clamp every connection with constant-torque or wire-tension clamps. Many APS kits include barbed fittings – ensure the ID of the hose matches the barb diameter (usually 5/8″ or 3/4″).

Bleeding the Coolant Lines

Air trapped in the intercooler jacket reduces cooling capacity. If your system has a bleed port, open it while filling. Otherwise, position the intercooler so its outlet is the highest point – tilt the car slightly if needed. Fill the system slowly until coolant flows from the outlet, then close the circuit. After initial fill, run the coolant pump with the engine off to purge remaining air.

Coolant Filling and System Pressure

Choosing Coolant

For a 1000 HP race engine, distilled water with a water-wetter additive (e.g., Red Line or Royal Purple) offers superior heat transfer compared to ethylene-glycol coolants. If freezing temperatures are a concern, use a minimal amount of propylene-glycol-based coolant. Follow the APS manufacturer’s recommended mix to avoid corrosion or lowered boiling point.

Filling Procedure

Pour coolant into the reservoir or intercooler fill port (if directly filled) until the system is full. With the engine off, operate the coolant pump (if separate) to circulate and push out air. Top off the reservoir. Crank the engine without starting it (by disabling fuel or spark) to bring coolant from the engine block into the intercooler loop. Repeat top-offs until the level stabilizes. Do not close the cap with the engine hot – always fill when cold.

Leak Check

Pressurize the coolant system to 15–20 psi using a hand pump pressure tester (available at auto parts stores). Hold pressure for five minutes and inspect all hose junctions, clamps, the intercooler core, and fittings for drips or bulges. A leak at any point can lead to catastrophic overheating in a race scenario. Fix and re-test until no pressure drop occurs.

Final Inspection and System Testing

Visual and Mechanical Checks

  • Verify all hose clamps are tightened uniformly.
  • Ensure no wires or lines are pinched between brackets or the intercooler body.
  • Reinstall any parts removed earlier (air intake, bumper, fan shrouds) while maintaining clearance to the intercooler.
  • Check that the intercooler inlet and outlet are the correct direction – air flow should be from turbo to intercooler to throttle body.

Engine Startup

Reconnect the battery. Start the engine and let it idle. Watch the coolant temperature on your engine management display. Charge air temperature (IAT) should drop significantly compared to a no-intercooler situation – expect a reduction of 30–60°F at idle with the coolant pump active. Rev the engine gently (avoid full throttle until the system is verified). Listen for any unusual whistling (boost leaks) or gurgling (air in coolant).

Road or Dynamometer Testing

Take the vehicle on a short shakedown run or load it on a dyno with a data logger. Monitor IAT and coolant temperature under moderate load. At full boost (1000 HP = roughly 30–50 psi depending on the engine), IAT should stay under 140°F (60°C) with an adequate heat exchanger. If IAT climbs rapidly, check coolant flow – a failed pump or blockage is common. Also verify that there is no boost pressure leak between the throttle body and intercooler – weak clamps can pop off under high boost.

Performance Tuning Considerations

An air-to-water intercooler changes the total volume and restriction of the intake tract. With a 1000 HP engine, you may need to recalibrate your engine management system’s air density calculation and knock sensor thresholds after installation. The denser, cooler air will allow more oxygen per cycle – aggressive timing and fuel maps can take advantage of this. Work with a competent tuner to adjust the VE table and re-check the air/fuel ratio.

Some APS kits recommend installing a heat exchanger with a fan that runs continuously when the engine is on. For drag racing, an ice water tank can drop IAT near ambient, providing a significant power gain on the starting line. Always account for the added weight of the coolant system – 1–2 gallons of water weights about 10–15 pounds.

Maintenance Tips for Race Use

  • Inspect clamps and hoses before every event – high boost and heat cycles loosen clamps over time.
  • Drain and replace coolant every three months or after severe overheating – electrolysis can damage the intercooler core.
  • Keep the intercooler core clean – debris blocking the air-side (if it uses a fan) reduces heat rejection. Use compressed air (15–20 psi) to blow out bugs and dirt.
  • Check for corrosion on aluminum castings and barb fittings – sacrificial anodes can be added to the coolant loop if dissimilar metals are present.
  • Monitor IAT sensor resistance – if the sensor is mounted in the charge pipe close to the intercooler outlet, ensure it is not wet from condensation or coolant leaks.

Conclusion

Installing the APS air-to-water intercooler on a 1000 HP race engine is a straightforward job when you methodically prepare, remove the old unit, mount the new core, and plumb both the charge air and coolant circuits. The result is a dense, cold charge that sustains power output across the entire run. By following the steps in this guide – including pressure testing the coolant loop, verifying alignment, and performing a data-backed final test – you can trust the intercooler to handle the heat load of extreme horsepower. For further technical details, consult the APS official website for product updates, and review racing community discussions on Turbo Forums for platform-specific tips. Always use quality water-wetter coolant additives and verify torque specs on the Boltdepot torque table if the manual is lost.