Why Upgrade Your R34 GT-R with an ETS Intercooler

The Nissan Skyline R34 GT-R is already an engineering marvel, but its factory intercooler becomes a bottleneck as soon as you push beyond stock power levels. The ETS (Extreme Turbo Systems) GT-R intercooler is widely regarded as one of the best drop-in replacements, offering significantly lower intake temperatures and pressure drop compared to the OEM unit. By upgrading to an ETS core, you unlock consistent performance, reduced risk of detonation, and the ability to safely run higher boost. This guide walks you through the installation process with pro-level best practices, ensuring you get the most from your investment.

Preparation: Tools, Parts, and Work Space

Before turning a wrench, gather every item you will need. Rushing or improvising mid-installation increases the chance of mistakes. The following list covers essential tools and materials, plus optional items that make the job easier.

Required Tools and Equipment

  • Metric socket set (10mm, 12mm, 14mm, 17mm) – ratchet, extensions, swivel joint for tight spots.
  • Combination wrenches – same sizes as sockets for nuts and bolts.
  • Flathead and Phillips screwdrivers – for hose clamps and electrical connectors.
  • Pliers – needle-nose and slip-joint for spring clamps and hoses.
  • Torque wrench (ft-lb and in-lb ranges) – critical for proper bolt tension.
  • Trim removal tools – helps pop clips on bumper and undertray without breaking them.
  • Safety glasses and mechanic’s gloves – protect against sharp edges and coolant.

Parts and Consumables

  • ETS GT-R intercooler kit – core, cast end tanks, mounting brackets, bolts, washers (verify contents).
  • Silicone couplers and T-bolt clamps – if not included, purchase high-quality 2.5″ or 3″ units to match the ETS inlet/outlet.
  • New OEM or aftermarket gaskets – for any flanged connections (e.g., compressor outlet).
  • Anti-seize compound – apply to bolts that will be removed later (e.g., crash bar bolts).
  • Catch pan and coolant – if your system is water-to-air, you may need to drain and refill.

Work Area Prep

Park the R34 on level ground. Engage the parking brake and chock the wheels. Let the engine cool completely if it has been run – the intercooler pipes and radiator will be hot. Clean the front of the engine bay and the lower bumper area so no debris falls into the system during disassembly.

Disassembly: Removing the Stock Intercooler

Most R34 GT-Rs came with a side-mount intercooler (SMIC) on the passenger side. Even newer vehicles and builds may already have a front-mount, but the procedure for removing a factory-style unit is similar. Begin by disconnecting the battery negative terminal. This prevents accidental short circuits and resets the ECU for idle re-learn after the job.

Step 1 – Remove the Front Bumper and Undertray

The R34 bumper cover must come off to access the crash bar and intercooler area. First, unclip the fender liners, remove the bumper bolts (usually 10mm) at the wheel arches and under the headlights, then unclip the top edge. Support the bumper and disconnect the fog light wiring if equipped. Slide it forward and set it aside on a soft surface. Next, remove the plastic undertray (10mm bolts and push clips). This gives full frontal access.

Step 2 – Remove the Crash Bar (If Required)

Some intercooler kits, including the ETS unit, are designed to fit behind the stock crash bar. However, for easier access and to route piping cleanly, many installers remove the crash bar temporarily. Use a 14mm or 17mm socket to unbolt the crash bar from the chassis horns. Note the torque setting – typically around 70–80 ft-lb. Set the crash bar aside.

Step 3 – Disconnect Intake Piping and Hoses

Trace the intake path from the turbo compressor outlet to the stock intercooler. Loosen the hose clamps at both ends. If the stock couplers are old and brittle, cut them off carefully with a razor – replace them with silicone couplers. Disconnect any vacuum lines (e.g., boost reference or bypass valve) that run to the intercooler pipes. Label each vacuum line with masking tape to avoid confusion later.

Step 4 – Unbolt and Remove the Stock Intercooler

The factory side-mount is held by two bolts top and bottom, often accessible from below. Use a short extension and swivel socket to reach the top mounting bolt. Support the intercooler with one hand when the last bolt is removed – it will drop. Slide it out through the wheel well or from below, depending on clearance. Be careful not to damage the A/C condenser or radiator fins.

Installation: Fitting the ETS GT-R Intercooler

With the stock unit out, clean the mounting area. Check that all brackets in the kit are oriented correctly. The ETS core is typically a bar-and-plate design that offers superior heat dissipation compared to tube-and-fin. Pay close attention to alignment – a crooked intercooler can induce boost leaks or contact the bumper.

Step 1 – Mount the Intercooler Brackets

Attach the supplied brackets to the chassis using the provided bolts, but do not fully tighten yet. The bracket bolts usually go into existing threaded holes in the core support or radiator support. Apply a drop of thread locker (medium strength) if the fasteners are not self-locking.

Step 2 – Position the ETS Core

Slide the intercooler into place, fitting it between the crash bar (if reinstalled) and the A/C condenser. Most ETS kits use the factory mounting points, so the core should sit flush. Insert the supplied spacer washers if needed to center the core left–right. Hand-tighten the bracket bolts.

Step 3 – Attach Silicone Couplers and Piping

Before tightening the core fully, connect the intake piping. Use the silicone couplers and T-bolt clamps included in the kit. Slide a clamp over each pipe end, then push the pipe onto the intercooler outlet. Rotate the pipe to aim the other end toward the turbo outlet or intake pipe. Use a second coupler to join sections. Tighten all clamps evenly – do not overtighten (damage aluminum tanks). A torque of 30–40 in-lb is sufficient for T-bolt clamps.

Step 4 – Reconnect Vacuum Lines and Electrical

Refer to your photos or labels to reconnect the bypass valve vacuum line, boost reference line (if running a manual boost controller or wastegate), and any fittings for the stock boost solenoid. If your R34 retains the factory recirculation valve, the hose from the intake to the valve must be reinstalled. Use new vacuum hose if the old stuff is hard or cracked.

Step 5 – Secure Core and Crash Bar

With the piping in place, tighten the intercooler bracket bolts to the manufacturer’s spec (typically 15–20 ft-lb for 10mm bolts). Reinstall the crash bar (if removed) and torque to 70–80 ft-lb. Reattach the plastic undertray, ensuring it does not rub against the intercooler piping. Then reinstall the bumper cover, aligning all clips and fasteners.

Post-Installation Checks and Adjustments

Before reconnecting the battery, inspect the entire intake tract. Look for any loose clamps, kinked hoses, or rubbing points between piping and the chassis. A tiny gap at a coupler can cause a boost leak that costs power and fuel economy.

Pressure Test the System

The most reliable method is a boost leak test. Use a boost leak tester fitted to the turbo compressor inlet and pressurize the system to 20 psi. Listen for hissing sounds. Spray soapy water on each coupler and pipe junction – bubbles reveal leaks. Tighten clamps accordingly. This step alone prevents countless roadside frustrations.

Reconnect Battery and Prime the System

Reconnect the negative battery terminal. Turn the ignition to “ON” (engine off) and wait 5 seconds for the fuel pump to prime. Start the engine and let it idle for 30 seconds. Check for any unusual noises, rattles, or rubbing. Rev the engine gently to 2000–3000 RPM and listen for whistling that indicates a leak. Shut off the engine and re-torque all intercooler bolts after the first heat cycle.

Performance Testing and Calibration

After the installation, it’s time to see the results. An ETS intercooler can lower intake air temperature (IAT) by 30–50°F on a hot day, allowing the ECU to run more timing and make more power. However, if your R34 has a modified ECU (like a Nistune or standalone), a professional tune is strongly recommended to take full advantage of the cooler intake charge.

Road Test and Data Logging

Take the car for a gentle 10-minute drive to bring everything up to temperature. Then find a safe stretch of road to perform a few third-gear pulls from 2500–6500 RPM. Log IAT, boost pressure, ignition timing, and AFR using a scan tool or a device like the Nislog or ECUTek. Compare IAT before and after the intercooler – the ETS core should show a much slower rise in temperature during the pull, and it should recover quickly between runs.

Common Tuning Adjustments

Because the intercooler reduces pressure drop, you may see slightly lower boost at the intake manifold (the turbo no longer has to work as hard). This is normal. You can compensate by increasing the boost 1–2 psi (if within safe limits for your fuel and turbo). Retard timing slightly if knock is detected, but the colder charge often allows more timing. Always consult a professional tuner.

Troubleshooting Common Installation Issues

Even with careful installation, issues can arise. Here are the most frequent problems and how to address them.

Boost Leaks

Symptoms: Hissing, low boost, poor throttle response, high fuel trims.
Solution: Perform a boost leak test as described above. Replace any coupler that seems too small for the bead on the ETS pipe. Use T-bolt clamps over worm-gear style – they provide even clamping force.

Intercooler Hitting the Radiator or AC Condenser

Symptoms: Rubbing, dented fins, loss of refrigerant or coolant.
Solution: Verify the core is centered. Many ETS kits include offset spacers to push the core forward or backward. If the core touches the AC condenser, install thin washers between the brackets and chassis to move it a few millimeters forward. Protect exposed areas with foam strips or rubber gaskets.

Pipe Rubbing on the Chassis

Symptoms: Noise, worn paint, eventual pipe failure.
Solution: Reposition the pipe so it has at least 5mm clearance on all sides. Wrap contact points with silicone tape or use heat-shield material if near the radiator hose. Secure any loose pipes with additional brackets or zip ties.

Overheating After Installation

Symptoms: Rapid temperature rise, fan running constantly.
Solution: The larger intercooler core can block airflow to the radiator if it is not properly sized or mounted too tightly. Verify that at least 70% of the radiator surface is unobstructed. If necessary, install a slim-profile electric fan kit or upgrade to a thicker radiator.

Maintenance and Long-Term Care

An ETS intercooler is low-maintenance, but regular checks extend its life. Every few months (or after any front-end damage), inspect the core for bent fins. Straighten them with a fin comb to maintain airflow. Check all coupler clamps for corrosion – replace stainless steel T-bolt clamps if they show rust pitting. Vacuum the cooler surface with a soft brush to remove debris that could block cooling.

If you drive in winter salt, wash the intercooler and piping thoroughly to prevent corrosion on aluminum surfaces. Bare aluminum can develop white oxidation, but it is cosmetic – do not paint the core as paint reduces heat transfer.

External Resources and Further Reading

For more in-depth technical data, refer to these authoritative sources:

Always cross-reference model year and engine variant (RB26 vs. RB25 swap) when ordering parts, and do not hesitate to contact ETS support directly for fitment questions.

Final Thoughts

Installing the ETS GT-R intercooler on your R34 is one of the most effective upgrades you can perform. It directly reduces intake air temperature, giving your engine the cool, dense air it needs for reliable power. By following this detailed guide – from proper tool prep, careful disassembly, and precise mounting, through to pressure testing and data logging – you eliminate guesswork and ensure the intercooler performs as designed. The time invested in meticulous installation pays off every time you press the accelerator. Enjoy the improved response and confidence that comes from a well-cooled RB26.