Choosing the Right Turbo Kit for Your GR86

The Subaru BRZ / Toyota GR86 platform has become one of the most popular vehicles for forced induction upgrades. While several turbo and supercharger kits exist, the Edelbrock 1.5L turbo system stands out for its balance of power, reliability, and engineering. Before diving into the installation, it’s critical to understand what this kit delivers and how it compares to other options on the market.

The Edelbrock 1.5L turbo kit is designed for daily-driven cars that see occasional track use. It uses a Garrett GTX28-series turbocharger, a large air-to-air intercooler, and a dedicated ECU tune via a reflash or piggyback module. The kit is emissions-legal in many states (CARB EO pending on some versions) and includes everything needed for a complete installation. For a deeper look at the official specs and included parts, visit the Edelbrock product page.

Other kits from companies like HKS, GReddy, and Crawford Performance offer different trade-offs in cost and complexity. However, the Edelbrock kit’s comprehensive nature and support make it an excellent starting point for both professional and experienced DIY installers.

Pre-Installation: Tools, Workspace, and Safety

Proper preparation prevents wasted time and damaged parts. The GR86 engine bay is compact, so having the right tools and a clean, well-lit area is essential.

Required Tools and Supplies

  • Socket set (metric, 8mm–19mm) with extensions
  • Combination wrenches (10mm, 12mm, 14mm, 17mm)
  • Torque wrench (capable of 10–80 ft-lbs)
  • Pliers (regular and snap-ring)
  • Screwdrivers (Phillips and flathead)
  • Jack and jack stands (or lift)
  • Oil catch pan
  • Shop towels and brake cleaner
  • Safety glasses and mechanic’s gloves

Workspace Preparation

Choose a level concrete floor. If using a lift, ensure it can handle the GR86’s weight (approx. 2,800 lbs). If working on jack stands, always chock the rear wheels. Disconnect the battery negative terminal before beginning any work to avoid electrical shorts or accidental airbag deployment.

Safety First

Turbo kits involve high temperatures and pressurized fluids. Wear gloves when handling oil lines and coolant hoses. Keep a fire extinguisher rated for Class B (flammable liquids) and Class C (electrical) nearby. Ensure adequate ventilation, especially if you are working in a closed garage—gasoline fumes and cleaning solvents can be hazardous.

Unboxing the Edelbrock 1.5L Turbo Kit

Upon receiving the kit, open and inventory every component against the provided checklist. The Edelbrock kit is well-packaged, but damage during shipping can occur. Inspect the turbocharger for shaft play, the intercooler for fin damage, and all gaskets for tears.

Kit Contents (Typical)

  • Garrett GTX2860R Gen II turbocharger
  • Cast aluminum turbo manifold
  • Air-to-air intercooler with mounting brackets
  • Mandrel-bent aluminum charge piping (hot and cold side)
  • Silicone couplers and T-bolt clamps
  • Upgraded fuel injectors (usually 550cc or 700cc)
  • ECU tune module (reflash cable or handheld device)
  • Oil feed and return line kit
  • Coolant lines
  • Hardware kit (bolts, nuts, washers, studs)
  • Installation manual and DVD

Some kits may include an optional blow-off valve or recirculation valve. Verify with your specific order. If any part is missing or damaged, contact Edelbrock technical support immediately.

Preparation for Installation

Before lifting the car, remove the engine undercover and drain the engine oil and coolant. This minimizes mess when you disconnect the oil and coolant lines from the factory locations. It’s also a good time to replace the spark plugs if the car has high mileage (platinum or iridium plugs are recommended for boosted applications).

Set aside the ECU tuning module and laptop with the tuning software if you plan to self-tune or monitor data. Many installers prefer to have the car safely on jack stands before starting, as the GR86’s low ground clearance makes underside access difficult without raising it.

Step-by-Step Installation Process

1. Remove the Stock Components

Start by disconnecting the battery negative terminal. Remove the factory air intake assembly (airbox, intake tube, and mass airflow sensor). Next, unbolt the plastic engine cover and set it aside. Remove the factory intake manifold (it will be replaced or modified depending on the kit). On the GR86, the intake manifold is held by 10mm bolts; carefully disconnect the vacuum lines and fuel rail as needed.

Remove the factory exhaust manifold and front pipe. The GR86 has a two-piece manifold that can be tricky—soak the nuts in penetrating oil an hour before starting. Keep the old gaskets and bolts separate; you may need them for reuse in some kits.

2. Install the Turbocharger

Edelbrock’s turbo mounting location is on the driver’s side of the engine, near the oil pan. Begin by installing the cast iron turbo manifold using the supplied gasket and hardware. Torque the manifold nuts to the manufacturer’s specification (usually 35–40 ft-lbs in a crisscross pattern).

Mount the turbocharger to the manifold with the supplied gasket. Do not overtighten the turbo-to-manifold bolts—use a torque wrench set to the spec indicated (typically 30 ft-lbs). Install the oil feed line into the top of the turbo, and the oil return line into the crankcase (you may need to drain the oil and remove the oil pan to drill/tap for the return, or use a factory port if available).

Connect the coolant lines: typically from the engine block to the turbo and back to the heater hose or coolant reservoir. Route the lines away from the exhaust manifold and secure with zip ties.

3. Set Up the Intercooler

The Edelbrock intercooler is designed to fit behind the factory front bumper. Remove the front bumper cover (unclip and unbolt) and, if necessary, the crash bar—some kits require a modified crash bar or removal. Position the intercooler in front of the radiator and condenser. Attach the mounting brackets to the chassis using provided hardware.

Run the charge piping from the turbo compressor outlet to the intercooler inlet (hot side), and from the intercooler outlet to the throttle body (cold side). Use the silicone couplers and T-bolt clamps. Ensure no pipe touches the frame or steering components; add rubber padding where needed.

4. Install Fuel Injectors

The stock fuel injectors cannot support the increased fuel demand. Remove the fuel rail and replace the injectors with the supplied higher-flow units. Reinstall the fuel rail with new O-rings and apply a light coat of engine oil to the O-rings for a good seal. Torque the fuel rail bolts to 8–10 ft-lbs.

If your kit includes a fuel pressure regulator or additional fuel pump, install those components according to the manual. The GR86’s returnless system often requires a piggyback regulator for proper fueling at high boost.

5. Connect the ECU Tuning Module

Tuning is the most critical step. The Edelbrock kit comes with a reflash file or a standalone ECU module (often an ECUTek or Cobb device). Follow the instructions to connect to the OBD-II port and upload the base calibration. Do not attempt to start the engine without a proper tune—severe damage can occur.

Some installers prefer to get a professional street or dyno tune immediately after the base file. For a more detailed explanation of tuning options, check this FT86 Club tuning forum.

Final Checks Before Starting the Engine

Reassemble any removed body panels. Reconnect the battery. Perform a thorough inspection of every connection:

  • Oil lines: Verify no kinks and that clamps are tight.
  • Coolant lines: Burp the system by removing the radiator cap and filling until fluid flows.
  • Charge pipes: Listen for leaks—use a boost leak tester if available.
  • Fuel system: Cycle the ignition on/off three times to pressurize the rail; check for leaks.
  • Electrical: Ensure the MAF sensor, IAT sensor, and boost solenoid are properly connected.

Refill engine oil (5W-30 or as recommended by Edelbrock) and coolant. Use a quality synthetic oil—turbocharged cars require better heat dissipation. Primer the turbo by disconnecting the fuel pump fuse (or crank with injectors unplugged) until oil pressure builds, then reconnect.

Starting the Engine: First Fire and Idle

With all systems checked, start the engine. Expect a slightly rough idle for the first few seconds as the ECU learns the new parameters. Let the engine warm to operating temperature while watching for:

  • Oil pressure: should be 20–30 psi at idle warm
  • Coolant temperature: stabilizes around 190–210°F
  • No smoke from the exhaust (except condensation)
  • No unusual sounds (metal rattling, screeching, or loud hissing)

Run the engine at idle for 10 minutes, then rev gently to 2,000–3,000 RPM in neutral. Check for boost leaks by listening or using a bleeder-fill tool. If the engine throws a check engine light, retrieve the code (use the tuning software) and address it—common codes include lean mixture, knock sensor, or MAF range errors.

Break-In Procedure for the Turbo Kit

New turbos and internal engine components benefit from a break-in period. Drive the car gently for the first 200 miles. Avoid hard acceleration, sustained high RPM, and heavy boost. Vary engine speed to help seat the turbo seals and piston rings (if the engine is new or rebuilt). After 200 miles, change the engine oil and filter—this removes any debris from the installation.

Dyno Testing Your GR86

Once the kit is broken in, a dyno session provides definitive proof of performance and allows fine-tuning for safety. Schedule an appointment at a reputable dyno facility that specializes in Subaru/Toyota platforms. Bring your laptop with tuning software if you plan to log data.

Pre-Dyno Preparation

  • Ensure the car has fresh oil and coolant.
  • Check tire pressure and wheel lug torque.
  • Reset the ECU by disconnecting the battery for 10 minutes (relearns fuel trims).
  • Have the dyno operator strap the car securely (RWD dyno recommended).

What to Expect on the Dyno

A properly tuned Edelbrock 1.5L kit on a GR86 typically produces 280–320 wheel horsepower on 91–93 octane pump gas, with boost levels around 8–10 psi. Torque peaks in the mid-3,000 RPM range, making the car much more responsive than stock. Expect a 100+ whp gain over the factory 180 whp.

Monitor wideband air/fuel ratio (target 11.5–12.0 at full boost) and knock retard (less than 2 degrees is acceptable). The dyno operator will make pulls in 4th gear (1:1 ratio) for consistent results. After each pull, allow the engine to cool for 2–3 minutes to avoid heat soak.

For reliable dyno verification, consider a facility using a Dynojet or Mustang dyno. A forum resource like GR86.org’s dyno database can help you compare results.

Common Installation Pitfalls and Solutions

Even experienced mechanics encounter issues. Here are frequent problems and how to avoid them:

  • Oil leaks at the turbo feed line: Use new crush washers and torque the fitting to spec (12–15 ft-lbs). Do not use Teflon tape on AN fittings.
  • Boost leaks at couplers: Ensure T-bolt clamps are over the barb of the pipe and tightened evenly. Use a small amount of hairspray or silicone lubricant to seat the coupler.
  • Fuel trims off: The MAF sensor may need recalibration. Some tuners recommend scaling the MAF curve based on airflow. If using a blow-off valve, ensure it does not vent to atmosphere (causes rich condition) unless the tune compensates.
  • Check engine light P0171 (lean): Check for post-MAF leaks, loose vacuum lines, or an incorrectly sized fuel injector dead-time setting.

If you get stuck, Edelbrock’s technical support has a reputation for being knowledgeable. Also, local tuning shops and online forums are invaluable. A comprehensive installation guide from FT86 Speed Factory provides factory-level detail.

Maintenance After Turbo Installation

Turbocharging puts additional stress on the engine and drivetrain. To keep your GR86 reliable for years:

  • Change oil every 3,000–5,000 miles with high-quality synthetic.
  • Inspect turbo oil and coolant lines for leaks every oil change.
  • Check charge piping clamps for tightness after the first 500 miles.
  • Replace the spark plugs every 20,000–30,000 miles (step colder range is recommended for boosted engines).
  • Monitor boost levels with a mechanical boost gauge or via ECU logging. If boost deviates, check for wastegate issues.
  • Cool down the turbo: after a hard drive, idle the engine for 30–60 seconds before shutdown to prevent oil coking.

Consider upgrading the clutch if you plan to track the car or launch aggressively. The stock clutch can handle 300 whp for a while, but it will slip under sustained hard use. A stage 2 clutch kit is a popular upgrade.

Performance Expectations and Driving Experience

After installation and tuning, the GR86 transforms. The car gains usable low-end torque—around 3,000 RPM the boost builds quickly, providing strong mid-range pull up to 7,000 RPM. The package is not about peak power; it’s about drivability. The Edelbrock kit is known for smooth power delivery, minimal lag, and excellent throttle response thanks to the small-frame Garrett turbo.

On the road, you’ll notice significantly easier passing on highways and the ability to squat into corners with confidence. The added power does require respect for the rear tires—traction control intervention becomes more frequent, and upgraded tires (summer performance) are highly recommended. Many owners report 0-60 mph times in the 4.0–4.5-second range with proper launch technique.

Conclusion

Installing the Edelbrock 1.5L turbo kit on a GR86 is a rewarding project that dramatically improves the car’s character. By following a systematic approach—from verifying the kit contents and preparing the workspace to methodically installing each component and performing thorough post-installation checks—you can achieve reliable, high-performance results. The key to avoiding headaches lies in attention to detail, proper torque specs, and investing in a quality tune. Whether you plan to daily drive your GR86 or take it to the track, this turbo kit offers a proven path to unlocking the FA24’s potential without sacrificing reliability. For further reading on turbocharging the FA24 engine, the official Toyota GR performance page provides additional resources on upgrades and accessories.