Why Upgrade to the AMS Alpha Intercooler on Your R32

The Nissan Skyline R32 GT-R is a legendary machine, renowned for its RB26DETT engine and advanced ATTESA all-wheel-drive system. However, decades of heat soak and aging components can rob the stock intercooler of its efficiency. The AMS Alpha Intercooler is engineered to drastically reduce intake air temperatures, increase charge density, and allow for more aggressive tuning. This upgrade is essential for any R32 owner pushing for higher horsepower or simply seeking more consistent performance in warm conditions. Factory intercoolers on the R32 are prone to inefficiency at elevated boost levels—above about 14 psi the stock core becomes a restriction. AMS addresses this with a larger, bar-and-plate core that flows up to 50% more air while dropping pressure across the system.

By replacing the restrictive factory unit, you unlock the engine’s true potential. Expect quicker spool, reduced knock tendency, and a measurable reduction in intake temperatures during sustained pulls. This guide covers everything from tool selection to post-installation verification, ensuring your R32 receives the upgrade properly.

Tools and Materials Needed

Preparation is the foundation of a smooth intercooler swap. Gather these items before jacking up the car:

  • AMS Alpha Intercooler Kit (including core, charge pipes, couplers, clamps, and mounting brackets)
  • Metric socket set (8mm, 10mm, 12mm, 14mm, 17mm)
  • Combination wrenches (10mm–17mm)
  • Screwdrivers (flathead and Phillips)
  • Torque wrench (capable of 20–80 Nm)
  • Pry tool or trim removal kit (for bumper clips)
  • Jack and jack stands
  • Coolant catch pan
  • Fresh coolant (Nissan Long Life or equivalent premix)
  • Shop towels and rubbing alcohol (for cleaning coupler surfaces)
  • Razor blade or scraper (to remove old gasket material)

Optionally, consider new hose clamps (worm-gear or T-bolt) and anti-seize compound for bolts that will need to come off again in the future. Having a helper for aligning the intercooler can save time.

Preparation Steps

Before lifting a tool, prioritize safety and access:

  1. Park the R32 on a level surface and engage the parking brake.
  2. Disconnect the negative battery terminal. This prevents accidental shorting and resets ECU adaptation, which will help the car re-learn with the new intercooler.
  3. Drain the coolant: locate the radiator drain cock, place a pan underneath, and open it. For better access, you may also drain the engine block drain bolt (located on the driver’s side of the block, below the exhaust manifold). Allow system to empty fully.
  4. Remove the front bumper. The R32 bumper is held by screws at the top (inside the hood gap), two bolts in each wheel well, and plastic rivets along the lower lip. Carefully pull the bumper forward, unplug any fog light or turn signal connectors, and set the bumper aside on a soft surface.
  5. Remove the metal bumper beam (impact bar). It is bolted with four 17mm bolts. This provides clear access to the intercooler mounting area.
  6. Disconnect the stock intake duct and any hoses that may interfere.

With the bumper off, you have a clean view of the factory intercooler and its restrictive piping.

Removing the Stock Intercooler

The factory R32 intercooler sits low in the front bumper cavity, flanked by the AC condenser and radiator. Take care not to damage the condenser fins.

  1. Disconnect the two rubber couplers that attach the stock intercooler to the intake piping. Loosen the worm clamps with a flathead screwdriver and slide them away from the connection points.
  2. Remove the two 10mm bolts that secure the intercooler mounting brackets to the chassis frame (one on each side). The brackets may be rusted; spray penetrating oil beforehand if needed.
  3. Carefully wiggle the stock intercooler upward and out of the lower support. It may be stuck due to age or dirt. Use a plastic pry tool to gently free it. The unit is heavy—around 10 kg—so have a helper support it.
  4. Once removed, inspect the rubber hoses for cracks. Even if they look okay, consider replacing them while you’re in there, as they are nearly thirty years old.

Cleaning the Mounting Area

Now is the ideal time to clean behind the intercooler. Use a degreaser and a soft brush to remove oil and debris from the lower radiator support and the frame horns. Any dirt trapped here can accelerate corrosion. Dry the area thoroughly before installing the new unit.

Installing the AMS Alpha Intercooler

The AMS kit is designed to be a direct fit with minimal modification. Follow these steps precisely.

  1. Test fit the intercooler core. Place the AMS unit in position. It will sit slightly higher and thicker than the stock unit, filling more of the bumper opening. If it does not slide into place, check that no protrusions block it—on some R32 chassis, the AC line bracket may need slight bending. Do not force the core; adjust gently.
  2. Attach the supplied mounting brackets to the intercooler. AMS provides two metal brackets that bolt to the sides of the core using M6 bolts (typically 10mm head). Do not tighten fully yet—leave some adjustment room.
  3. Position the intercooler in the vehicle. Lift the core into place and align the brackets with the factory mounting holes on the chassis. Insert the factory 10mm bolts (use new ones if rusted) and tighten to 35 Nm (26 lb-ft). If the holes do not line up, slightly adjust the bracket position on the intercooler side.
  4. Torque the intercooler-to-bracket bolts to 10 Nm (7.4 lb-ft). Double-check that the core sits centered and level, with equal gap to the radiator on all sides.
  5. Attach the charge pipes. The AMS kit includes aluminum piping that replaces the restrictive factory y-pipe and lower routes. Apply a thin film of silicone grease to the inside of each coupler for ease of assembly. Slide the coupler onto the intercooler outlet pipe, then push the charge pipe into the coupler. Tighten the T-bolt clamp to 4–5 Nm (finger tight plus a quarter turn). Do not overtighten; you want a leak-free seal without distorting the pipe.
  6. Connect the upper charge pipe that runs to the throttle body. The kit typically includes a modified y-pipe or a single 3-inch pipe that splits near the engine. Route this piping away from hot surfaces (exhaust manifold, turbo housings) and secure with the provided nylon spacers if supplied. Tighten all coupler clamps evenly.

Hose and Clamp Guidelines

  • Use only the silicone hoses supplied with the kit; they are rated for high temperature and pressure.
  • Position clamps so that the threaded part faces outward, accessible for future adjustments.
  • Reuse factory rubber grommets from the stock unit if the AMS bracket requires cushioning; otherwise, use the included foam strips to prevent metal-on-metal contact.

Reconnecting Components

After the intercooler is firmly installed, reverse the removal steps:

  1. Reconnect the silicone hoses. Some kits use a small blow-off valve hose recirculation fitting—make sure it is plumbed correctly. Use new hose clamps if the old ones are corroded.
  2. Reinstall the bumper beam. Torque the four 17mm bolts to 70 Nm (52 lb-ft). The beam provides crucial crash protection, so do not skip this step.
  3. Reattach the front bumper. Work from the bottom up: first align the lower clips, then the upper screw holes. Tighten all fasteners evenly. If your R32 has a front lip support bar, make sure it sits correctly over the intercooler—you may need to trim the bar slightly for the thicker core. AMS includes instructions for this minor modification.
  4. Reconnect the battery terminals. Tighten to factory spec (12 Nm).
  5. Refill the cooling system. Use a 50/50 mix of Nissan Long Life coolant and distilled water. Fill slowly to allow trapped air to escape. Run the engine with the radiator cap off until the thermostat opens and coolant circulates. Top off as needed.

Final Checks and Testing

Before taking the car on the road, a methodical verification ensures reliability:

  • Pressure test the intercooler system. A simple way is to use a boost leak tester (a PVC cap with a Schrader valve that fits into the intake pipe). Pressurize the system to 15–20 psi and listen for hissing. Soapy water sprayed on all connections will reveal bubbles if a leak exists. Fix any leaks immediately.
  • Check for coolant leaks around the radiator and heater hoses that were disturbed during the service.
  • Inspect the fan clearance. Verify that the intercooler does not contact the radiator fan shroud. If it does, add spacer washers to the shroud mounts.
  • Start the engine and let it idle until it reaches operating temperature (about 90°C). Observe the temperature gauge—it should remain stable. Fan cycling should be normal.
  • Test drive gently for 10 minutes, keeping boost low. Listen for any unusual sounds (whistling from a poor coupler seal). Gradually increase boost to verify improved response. Your factory boost gauge may show slightly lower peak readings due to reduced pressure drop—this is normal and indicates better airflow.

Performance Gains and Tuning Considerations

After installing the AMS Alpha Intercooler, you can expect intake air temperatures (IAT) to drop by 20–30°C during sustained runs. This reduction allows the ECU to run more aggressive timing without knock. For stock ECUs, the improvement is still beneficial—less heat soak means more consistent power. If you have a standalone ECU or piggyback tuner (like Apexi Power FC or Link), you can safely increase boost by 2–3 psi and lean out the fuel mixture slightly. Many tuners report a 20–40 whp gain on Stage 2 cars with this intercooler alone.

However, keep in mind that the larger core may increase turbo lag slightly on smaller turbos (stock RB26 twins) due to additional volume. This effect is minimal and usually offset by denser intake charge. If you are running upgraded single turbos, the lag penalty is negligible.

Regular Maintenance After Installation

  • Check coupler clamp torque every 6 months—heat cycles can cause them to loosen.
  • Inspect the intercooler core for debris (leaves, stones) that might block airflow. Clean gently with low-pressure water and a fin comb.
  • Monitor the silicone hoses for cracking or swelling over time. Replace every five years as preventative maintenance.

External Resources

For additional technical specifications and product updates, refer to the AMS website. Community experience on the R32 forum GTR.co.uk also provides real-world install tips. If you plan to purchase the kit, authorized distributors like RHDJapan offer competitive pricing and shipping support for the R32 market.

Conclusion

Installing the AMS Alpha Intercooler on your R32 is a straightforward yet highly effective method to combat heat soak, reduce intake temperatures, and support higher power levels. With careful attention to mounting, rigging the charge pipes, and verifying leaks, your R32 will reward you with sharper throttle response and greater consistency. The effort is well worth the reward—a cooler-running, stronger-performing Skyline that retains its street manners. Follow this guide, take your time, and enjoy the difference a quality intercooler makes.