Introduction: Unlocking the True Potential of Your Nissan Skyline

The Nissan Skyline—whether an R32, R33, or R34 GT-R or GTST—is already a performance icon thanks to its advanced all-wheel-drive system, potent inline-six engines like the RB26DETT, and a chassis that begs for more power. Adding 100 horsepower is a transformative upgrade that changes how the car accelerates, pulls out of corners, and responds to throttle input. Among the aftermarket turbo kits available, the HKS V-Power Turbo Kit stands out for its engineering precision, reliability, and proven power gains. This guide provides a detailed, step-by-step walkthrough for installing the HKS V-Power Turbo Kit on your Skyline, aiming for a clean, safe, and repeatable 100-whp increase.

We will cover everything from essential tools and workspace preparation to removing the stock turbo, handling oil and coolant lines, mounting the HKS unit, and the critical tuning that ensures your engine survives and thrives. By the end, you will have the confidence to tackle this installation yourself or verify the work of a professional shop. Always remember: proper installation and tuning are non-negotiable for reliability.

What You Will Need: Tools, Parts, and Safety Gear

Before touching a wrench, gather every item on this list. Having everything at hand prevents mid-job interruptions and reduces the risk of mistakes.

Core Components

  • HKS V-Power Turbo Kit – Verify you have the correct version for your specific Skyline model (R32 GT-R, R33 GTST, etc.). The kit typically includes the turbocharger, wastegate, actuator, oil and coolant lines, exhaust manifold, downpipe, and gaskets.
  • Replacement gaskets and seals – Do not reuse old gaskets. Order a full set for the turbo-to-manifold, downpipe-to-turbo, and any intake manifold gaskets disturbed during disassembly.
  • Oil catch can – Highly recommended to reduce crankcase pressure and prevent oil contamination of the intake tract when running higher boost.
  • Fuel system upgrades – If your Skyline still has stock fuel injectors and fuel pump, they will likely max out with 100 extra horsepower. Plan to upgrade to at least 550cc injectors (or larger) and a high-flow fuel pump such as a Walbro 255 lph or AEM 320 lph.
  • Coolant and engine oil – Use high-quality coolant (OEM spec or equivalent) and fresh engine oil (recommended 10W-40 or 15W-50, depending on your climate and build).

Tools

  • Basic hand tools: metric socket set (8mm–19mm), combination wrenches, Allen keys, screwdrivers (flat and Phillips)
  • Torque wrench (capable of 20–80 Nm range)
  • Breaker bar for stubborn bolts
  • Pry bar (carefully used)
  • Oil filter wrench
  • Coolant funnel and drain pan
  • Safety gear: mechanic’s gloves, safety glasses, and if using a lift, jack stands (never rely on a jack alone)

Preparation: Workspace, Safety, and Battery

Choose a clean, well-ventilated area with ample lighting. Concrete floors with a drain are ideal for coolant and oil spills. If working on a driveway, use absorbent pads and a drip tray. Disconnect the negative battery terminal to avoid short circuits when handling electrical connectors near the intake manifold. Allow your Skyline to cool completely – a cold engine is safer and prevents accidental burns.

Before disconnecting anything, take reference photos of the engine bay, especially around the stock turbo: hose routing, vacuum lines, and wiring connectors. These images will save hours when reinstalling.

Removing the Stock Turbocharger

This step is critical. Any mistake here can damage adjacent components or cause leaks later. Work methodically.

Drain Fluids

Place a drain pan under the radiator and remove the lower radiator hose or drain plug to drain coolant. Then drain the engine oil from the oil pan. Reinstall the drain plug with a new crush washer.

Remove Intake and Exhaust Piping

  • Loosen and remove the intake pipe that connects the air filter housing to the stock turbo inlet.
  • Disconnect the intercooler piping from the turbo outlet. On GT-R models, the intercooler is side-mounted; on GTST, it is top-mounted. Label the hoses for reinstallation.
  • Unbolt the downpipe from the turbo exhaust outlet. The bolts are often rusted; apply penetrating oil (e.g., PB Blaster) an hour prior.
  • Support the downpipe and disconnect it from the exhaust system.

Disconnect Oil and Coolant Lines

The stock turbo has both oil feed and return lines as well as coolant lines. The oil feed line typically comes from the engine block, while the return line goes to the oil pan. Coolant lines run to and from the engine cooling system in a “water-cooled” configuration. Use a line wrench (flare nut wrench) to avoid stripping fittings. Plug the open ports on the engine immediately with clean rags or caps.

Unbolt the Turbo from the Manifold

The stock turbos are mounted to an exhaust manifold with three or four studs and nuts. Remove these nuts. On the RB26DETT, the manifold supports the turbo; you may also need to unbolt a support bracket. Carefully slide the turbo forward and lift it out – it is heavy, so have a second set of hands or a support strap. Do not let the turbo hang on the oil return line.

Preparing the HKS V-Power Turbo Kit

With the stock turbo removed, inspect the engine bay for any oil or coolant leaks that may have been hidden. Clean the manifold flanges with a wire brush and intake/throttle body cleaner. Now prepare the HKS kit:

  • Open the box and verify all parts are present against the HKS product sheet. Check for damaged compressor wheel fins or cracked housings.
  • If your kit includes a new exhaust manifold, install it now. Torque the manifold bolts to factory specifications in a cross-hatch pattern.
  • Install new gaskets on the turbo-to-manifold flange and downpipe flange. Never use old gaskets.
  • Attach the HKS oil and coolant fittings (banjo bolts, washers) to the turbo. Ensure proper crush washers are used to prevent leaks.
  • If the kit includes an external wastegate, pre-assemble it. Most HKS V-Power kits use an internal wastegate with a heavy-duty actuator. Follow the kit instructions for actuator preload (usually 0 bar at zero boost, then adjusted with shims).

Installing the HKS V-Power Turbo Kit

This is the core of the installation. Take your time to ensure alignment, cleanliness, and proper torque.

Mount the Turbo on the Manifold

Raise the HKS turbo into position. Align its mounting flange with the manifold studs. Use new locking nuts (often supplied in the kit) and torque to 30–35 Nm (check kit spec). Do not overtighten – aluminum housings can crack.

Connect Oil Lines

Install the oil feed line from the engine block to the turbo. The HKS kit typically uses a braided stainless steel line. Tighten banjo bolts to 25 Nm. Connect the oil return line from the turbo to the oil pan using a new gasket. If the return fitting does not align perfectly, you may need to cut or reposition a hose. Ensure the return line slopes downward without any loops or kinks – oil must drain freely.

Connect Coolant Lines

Attach the coolant feed and return hoses. Use constant torque clamps (not worm gear clamps) to prevent leaks under high pressure. Fill the cooling system with fresh coolant, but wait to run the engine until after all connections are secure.

Install Intake and Exhaust Piping

  • Connect the HKS intake pipe to the turbo inlet. Use a new silicone coupler and T-bolt clamps.
  • Mount the air filter away from heat sources. If using an HKS Super Power Flow filter, position it in a cold air location.
  • Attach the turbo outlet to the intercooler piping. Check that all couplers are clean and aligned.
  • Install the HKS downpipe and gasket. Torque to 35 Nm and connect to the existing exhaust system. You may need a mid-pipe adapter or aftermarket cat-back for proper fitment.

Install Wastegate Actuator and Boost Reference

Set the wastegate actuator rod length according to HKS recommendations (usually 0–2mm preload). Connect the boost reference line from the compressor housing or intake manifold to the actuator. Use a quality silicone vacuum line.

Final Under-Hood Checks

  • Install the oil catch can between the crankcase vent and intake. Route hoses securely away from exhaust manifolds.
  • Reconnect the battery negative terminal.
  • Fill the engine with fresh oil (5–6 liters for most RB engines). Fill the coolant reservoir and top off the radiator.
  • Prime the oil system by disabling the fuel pump (pull the fuel pump relay or fuse) and cranking the engine for 10 seconds in 5-second intervals until oil pressure registers on the gauge.

Startup and Leak Check

Re-enable the fuel pump. Start the engine and let it idle at 1,000-1,200 RPM. Check for oil leaks at every fitting. Listen for any exhaust leaks (whistling or ticking) at the turbo gaskets. Let the engine reach operating temperature. If all is well, turn off the engine, drain any remaining coolant from the overflow tank, and re-check fluid levels.

Do not drive the car yet. The engine management system must be tuned to handle the increased airflow and fuel requirements.

Tuning Your Skyline for 100 Extra Horsepower

An HKS V-Power turbo is a significant upgrade from the stock unit. Even with the wastegate set at base boost (e.g., 0.5 bar / 7 psi), the engine will run lean if the ECU is not recalibrated. This leads to detonation and catastrophic failure. Tuning is mandatory.

Choosing a Tuning Solution

  • Standalone ECU – The premium option for full control (e.g., AEM Infinity, Haltech Elite, MoTeC M130). Offers precise fuel and ignition maps, boost control, and safety features.
  • ECU Flash – For later-model Skylines with more modern ECUs, a reflash by a reputable tuner can work for mild bolt-on kits. However, the stock ECU’s limitations (e.g., MAF scaling) may require additional hardware (e.g., a MAP sensor conversion).
  • Piggyback ECU – Devices like the HKS F-Con or Apexi Power FC are popular. They intercept sensor signals and modify fuel and timing. The Power FC is particularly well-supported for the RB26.

What a Good Tune Addresses

  • Air-Fuel Ratio (AFR): Target 11.5-12.0:1 under full boost for safe power.
  • Ignition Timing: Retard timing under boost to prevent knock. Typical values: 10-12 degrees at max boost.
  • Boost Control: Set a safe boost level (e.g., 1.0 bar / 14.7 psi) that achieves the desired 100 hp gain without exceeding the turbo’s efficiency range. The HKS V-Power is capable of 20+ psi, but that requires stronger internals.
  • Fuel Injector Scaling: If you installed larger injectors, the ECU must know their flow rate. A tuner will adjust this along with dead times.

Find a dyno tuning specialist experienced with Nissan Skylines. A road tune is possible but less precise. Expect to pay $500–$1,000 for a professional tune. HKS offers their own programmable ECUs that integrate seamlessly with their turbo kits.

Potential Challenges During Installation

Even with a well-sorted kit, you may encounter these common obstacles:

  • Stuck bolts and studs: The exhaust manifold studs on older RB engines often snap. Use heat (torch) or a stud extractor. Replace with high-quality ARP studs.
  • Oil return line routing: The HKS kit may require modification to the stock oil pan (e.g., welding on a -10AN fitting) if a bolt-on return plate is not provided. Check before installation.
  • Intercooler piping conflict: On R33 GTST models, the stock intercooler placement may interfere with the larger HKS turbo compressor outlet. You may need a custom intercooler core or pipe rerouting.
  • Clearance to the brake master cylinder: On R32 GT-Rs, the HKS V-Power turbo on the driver’s side can be very close to the brake lines. Double-check clearance and consider heat wrapping or a heat shield.

Maintenance After Installation

With the power increase, your Skyline demands more diligent upkeep. Follow these tips:

  • Change oil and filter every 3,000 miles (5,000 km). The turbo spins at high RPM, putting extra heat into the oil.
  • Inspect the oil catch can contents every 1,000 miles. Empty or clean as needed.
  • Check all turbo bolts and intake clamps after the first 500 miles – thermal cycling can loosen them.
  • Monitor AFR and boost pressure with a gauge (e.g., AEM, Innovate). Do not rely on the factory boost gauge.
  • Consider upgrading the cooling system: a larger alloy radiator and an oil cooler help maintain stable temperatures on track days.

Additional Resources

For further reading and community support, visit these authoritative sources:

Conclusion

Installing an HKS V-Power Turbo Kit on your Nissan Skyline is a direct path to a reliable 100+ horsepower gain. By following the detailed removal and installation procedures, using new gaskets and proper torque specs, and investing in a professional tune, you transform your car into a much stronger performer without sacrificing daily drivability. The key to success lies in preparation, patience, and a commitment to doing the job correctly – no shortcuts on the oil return line, no reusing old crush washers, and no skipping the tuning session.

When done right, the sound of your Skyline spooling that HKS turbo, combined with the surge of power, is an experience every enthusiast deserves. Now get to work – your Skyline is waiting to breathe fire.