The Boostane 300 HP Turbo Kit transforms the Subaru BRZ / Toyota GR86 chassis into a seriously quick machine. Designed to bolt onto the FA24 engine, this kit delivers reliable power without pushing the stock internals to the breaking point. But the difference between a smooth, dependable build and a frustration-laced garage project often comes down to how meticulously you follow the installation process. This guide covers the best practices for installing the Boostane turbo kit, from preparation to tuning, ensuring you get the most out of your upgrade.

Preparation Before Installation

Rushing into a turbo installation without adequate preparation is the fastest way to run into problems. The FA24 engine bay is tight, and every step matters. Take the time to prepare properly, and the actual install will flow much more smoothly.

Tools and Supplies Checklist

Beyond the obvious socket set, you will need specific tools to avoid stripping bolts and damaging components. Gather these before you begin:

  • Metric wrench and socket set (10 mm, 12 mm, 14 mm, 17 mm, 19 mm are most common)
  • Torque wrench (capable of reading in lb-ft and in-lb)
  • Set of hex (Allen) keys
  • Pick set for removing gaskets and clips
  • Gasket scraper / razor blade
  • Dead-blow hammer (for stubborn components)
  • Engine hoist or transmission jack (optional but helpful for heavy parts)
  • Safety glasses, mechanic's gloves, and a fire extinguisher
  • Shop towels and brake cleaner
  • Thread locker (medium strength, e.g., Loctite 242)
  • Anti-seize compound for exhaust fasteners
  • A copy of the factory service manual (or access to online resources like FT86Club forums)

Check that your Boostane kit contains every listed component. Contact Boostane or your vendor immediately if anything is missing. Missing parts can delay your project by days or weeks.

Workspace and Vehicle Preparation

Work on a level concrete surface with good lighting. Ramps or jack stands are essential—never rely solely on a floor jack. Disconnect the battery negative terminal and wait at least ten minutes before proceeding; the airbag and fuel systems retain voltage.

Drain the engine oil and coolant before disassembly. The turbo installation requires removing the oil pan and water lines, so fresh fluids are mandatory. Label every hose, connector, and bolt as you remove them—even if you think you will remember. Zip ties and masking tape with a marker are your friends.

Step-by-Step Installation Guide

Break the process into logical phases. Each phase builds on the previous one, so work methodically and never skip steps.

Step 1: Remove Stock Components

Begin by stripping the engine bay of items that block access to the exhaust manifold, intake, and fuel system. This includes:

  • Stock air intake and airbox assembly
  • Engine cover and sound tube (if equipped)
  • Exhaust manifold and heat shields
  • Front downpipe (the section between the exhaust manifold and front catalytic converter)
  • Intercooler piping (if your GR86 has a factory front-mount intercooler, remove it)
  • Oil cooler lines (if present) – cap them immediately to prevent debris ingress
  • Stock fuel injectors and fuel rails (more on this in Step 4)

When removing the exhaust manifold, soak the bolts with penetrating oil the night before. The high heat cycle makes them incredibly stubborn. Use the gasket scraper to clean all mounting surfaces carefully. Any leftover gasket material will cause exhaust leaks that hurt turbo performance.

Disconnect the battery negative cable now if you haven't already. This prevents accidental shorts while working near the starter, alternator, and ECU harnesses.

Step 2: Install the Turbocharger

With the exhaust manifold studs clean and the engine block surface spotless, it is time to mount the Boostane turbo. Follow these guidelines for a solid, leak-free installation:

  • Apply anti-seize to the exhaust manifold studs. Torque the manifold nuts to factory spec (check the Boostane manual—typically around 25–30 lb-ft).
  • Position the turbo onto the manifold. Use a new gasket (supplied with the kit) between the manifold and turbo flange. Tighten the V-band clamp or bolts to the recommended torque—over-tightening can warp the flange.
  • Connect the oil feed line from the engine block to the turbo center housing. Use thread sealant on the block fitting. The return line should run downhill to the oil pan without any low spots that could trap oil.
  • Route the water lines (if your kit includes water cooling). The Boostane 300 kit typically uses an oil-cooled only design, but verify your specific version.
  • Double-check that all oil and water fittings are tight. A loose oil line will dump engine oil quickly under pressure.

Critical: Before connecting the turbo oil feed, prime the turbo by pouring a small amount of clean engine oil into the oil inlet while spinning the turbine wheel by hand. This prevents dry starts that can destroy the bearing cartridge instantly.

Step 3: Attach the Intercooler and Charge Piping

The intercooler and piping must be installed with precision to avoid boost leaks. A single loose coupler will cost you horsepower and can cause dangerous lean conditions.

  • Mount the Boostane intercooler core in the front bumper opening. Use the supplied brackets and rubber isolators to reduce vibration. Ensure the intercooler sits straight and does not contact the radiator or condenser.
  • Connect the hot-side pipe from the turbo compressor outlet to the intercooler inlet. Use T-bolt clamps (included with quality kits) and apply a thin film of silicone lubricant to the couplers for easier assembly.
  • Run the cold-side pipe from the intercooler outlet to the throttle body. Keep the pipe away from hot exhaust components and moving belts. Use nylon wire ties to secure the pipe if necessary.
  • Bleed the system by pressurizing it with a boost leak tester. You can build one from a PVC cap and air fitting. Pressurize to 20 psi and listen for hisses. Soapy water sprayed on joints will reveal bubbles.

Do not overtighten T-bolt clamps—they can deform the silicon couplers. A snug fit is sufficient; the clamp should not fully compress the silicone.

Step 4: Upgrade the Fuel System

The stock FA24 fuel system runs out of capacity around 350–400 whp. The Boostane kit is rated for 300 hp at the wheels, so a fuel system upgrade is mandatory for reliability. Boostane includes higher-flow injectors and an upgraded fuel pump in most configurations. Here's how to install them properly:

  • Depressurize the fuel system before removing lines. Remove the fuel pump fuse, start the engine, and let it stall. Then disconnect the battery.
  • Swap the fuel injectors one at a time to avoid mixing them up. Lubricate the O-rings with petroleum jelly before inserting into the fuel rail. Torque the fuel rail bolts to the specified value (usually 8–10 lb-ft).
  • Install the fuel pump in the tank. This often requires removing the rear seat and access panel. Clean the area thoroughly before opening the tank to prevent dirt from entering.
  • If your kit includes an adjustable fuel pressure regulator, mount it in a cool location away from exhaust heat. Run a dedicated return line to the tank (some kits use a modified fuel rail with return capability).

Check for fuel leaks by turning the ignition to "ON" without starting the engine. The fuel pump should prime. Look under the hood and under the car for any drips. Use a professional fuel pressure gauge to confirm the pressure matches the tuning requirements (typically 58 psi for returnless systems).

Step 5: Reassemble and Initial Test

Now that the turbo, intercooler, piping, and fuel system are installed, reassemble the remaining components. Reconnect the battery, install the drive belts, refill coolant, and add the correct amount and grade of engine oil (Premium synthetic 5W-30 is recommended).

  • Double-check every hose clamp, bolt, and electrical connector. Pay special attention to the wastegate actuator line and the blow-off valve recirculation hose.
  • Start the engine with the hood open. Listen for any abnormal noises: ticking might indicate a loose exhaust gasket; whining could be a belt or a compressor surge. Let the engine idle for 10–15 minutes to allow the ECU to learn the new components and to cycle oil through the turbo.
  • Check for oil leaks at the turbo center section, oil pan drain plug, and oil filter area. Also inspect any water lines you installed.
  • Shut off the engine and re-tighten all exhaust bolts after the components have cooled from their first heat cycle. The gaskets will compress slightly, and bolts can loosen.

Before taking the car on the road, perform a thorough boost leak test again. Even a tiny leak at the throttle body coupler will cause erratic idle and poor drivability.

Tuning and ECU Calibration

A turbo kit is only as good as its tune. The stock ECU cannot compensate for a 100% increase in airflow and fuel delivery. Running the car without a proper calibration will cause detonation, high exhaust gas temperatures, and eventual engine failure.

Work with a reputable tuner who specializes in the FA24 platform. Many tuners offer remote tuning via data-logging with the ECUTek or Cobb Accessport platforms. Your Boostane kit may include a base map, but it is strongly recommended to get a custom tune for your specific fuel (pump gas, E85, etc.) and elevation.

Key tuning adjustments include:

  • Fuel tables: target air-fuel ratio around 11.5:1 under boost for gasoline, 12.0:1 for E85.
  • Ignition timing: reduce timing under boost to prevent knock. Typical boost targets are 8–10 psi on pump gas.
  • Boost control: set the wastegate duty cycle to achieve your target boost level without overshooting. Use a boost gauge to verify.
  • Map sensor scaling: install a 3-bar or 4-bar map sensor (if required) and calibrate the ECU accordingly.

After the tune is loaded, perform a few gentle pulls in third gear. Data-log the session and send the logs to your tuner for refinement. Never do full-throttle runs until the tuner gives the green light.

Post-Installation Maintenance and Best Practices

Once the kit is installed and tuned, your GR86 will be significantly faster. But increased power demands increased maintenance. Adopt these practices to keep the car reliable:

  • Change the engine oil every 3,000 miles or 3 months, whichever comes first. Turbos heat the oil more than a naturally aspirated engine. Use a high-zinc synthetic oil to protect the flat-tappet valvetrain.
  • Inspect spark plugs every 10,000 miles. Boosted engines can foul plugs quickly, especially if you use a rich tune. Upgrade to a colder heat range if you plan to push the kit beyond 300 hp.
  • Check the intercooler piping clamps and couplers every oil change. Vibrations can loosen them over time.
  • Monitor your wideband air-fuel ratio gauge. If you notice the mixture going lean (above 12.5:1 under boost), lift off the throttle immediately and investigate.
  • Use the highest octane fuel available. Pump gas 93 octane is the minimum; E85 is ideal for the FA24.
  • Let the engine idle for 30 seconds after a hard drive before shutting it off. This allows the turbo to cool and prevents oil coking in the bearing journal.

Common Issues and Troubleshooting

Even with careful installation, issues can arise. Here are the most common problems and their solutions:

Boost Leaks

If the car feels lazy above 3,000 rpm or the boost gauge shows lower pressure than expected, the cause is likely a boost leak. Inspect every coupler and weld on the charge pipes. A vacuum/boost leak tester is essential for diagnosis. Also check the intercooler core for cracks.

Oil Leaks at the Turbo

Oil dripping from the turbo center section usually indicates a failed oil seal. This can happen if the oil return line is kinked or blocked, causing back-pressure. Verify that the return line flows freely and is not rubbing against a heat shield. Also check the oil feed line for restrictor; some turbos require a restrictor to limit oil flow.

Fuel Pressure Drops Under Boost

If your wideband shows the mixture leaning out when you go full throttle, the fuel pump may not be keeping up. Upgrade to a brushless fuel pump (like the DW400 or AEM 340) if you are using the included pump. Also inspect the fuel filter for debris caused by the installation process.

Check Engine Light (CEL)

Common codes after a turbo install include P0172 (rich), P0171 (lean), P0300 (misfire), or P000B (cam timing). These are often due to a boost leak or improper tuning. Double-check vacuum lines and the MAF sensor location. If you relocated the MAF, the tune must compensate for the different tube diameter.

Conclusion

The Boostane 300 HP Turbo Kit is a well-engineered system that can transform your GR86 into a legitimate performance car without sacrificing daily drivability. Following the best practices outlined here—thorough preparation, precise component installation, proper fuel system upgrades, professional tuning, and rigorous maintenance—will ensure that your build is not only fast but also reliable. Invest the extra time during installation to address every detail, and you will enjoy thousands of miles of boosted driving. For further reading, refer to Boostane's official website for the latest kit revisions, and join the discussions on GR86.org for community support and shared experiences.