Brake System Overhaul

Braking performance on a track-prepped R34 GT‑R is the single most important safety and performance factor. Stock brakes, while capable for road use, will quickly fade under repeated high-speed braking zones. A complete brake system overhaul is required to achieve consistent, fade-free stopping power.

Brake Pads

Start with a set of dedicated track pads. Pad compound choice depends on your track use: endurance or sprint. For endurance, look for a compound that offers high initial bite and stable friction across a wide temperature range, such as the Endless ME20 or Project Mu Club Racer. Sprint racers may prefer a more aggressive compound like the Pagid RSL29. Avoid dual-purpose street/track pads if you plan to push the car—they compromise both cold and hot performance.

Brake Rotors

Larger rotors help dissipate heat and increase braking torque. A common upgrade is the Nismo or AP Racing two-piece floating rotor kit. The floating design reduces heat transfer to the hub and allows the rotor to expand evenly under high temperatures. Slotted rotors are preferred over drilled for track work, as drilled rotors are prone to cracking under extreme heat cycles. Rotor diameter should be chosen to fit your wheel size—typically 330–380 mm fronts on an R34.

Brake Lines and Fluid

Replace rubber lines with stainless steel braided lines. This eliminates the spongy pedal feel caused by line expansion under pressure. For brake fluid, use a high-temperature DOT 4 or DOT 5.1 fluid such as Motul RBF 660 or Castrol SRF. These fluids have dry boiling points north of 590°F, so you won’t experience fade even during the most aggressive sessions.

Caliper Upgrade

If you are building for serious competition, consider upgrading to a multi-piston caliper kit. The factory Brembo calipers are good, but a 6-piston front caliper from AP Racing, Alcon, or StopTech provides increased pad area and better clamping force distribution. Make sure to match the master cylinder bore to the new caliper piston volumes to retain proper pedal travel and feel.

Suspension and Chassis Tuning

The R34 GT‑R’s ATTESA E‑TS pro all-wheel-drive system provides incredible traction out of corners, but the chassis must be tuned to complement that grip. A well-sorted suspension translates to faster lap times and better driver confidence.

Coilovers

Adjustable coilovers are mandatory for track work. Look for a set that offers independent compression and rebound adjustment, such as Ohlins Road & Track DFV, KW Clubsport, or HKS Hipermax IV GT. Set the spring rates based on your track and tire choice—typically 12–16 kg/mm front, 10–14 kg/mm rear for circuit use. Don’t forget to corner-weight the car after installation to balance the chassis.

Sway Bars

Upgraded sway bars reduce body roll and improve transient response. A common setup is a 30 mm front and 25 mm rear adjustable bar from brands like Whiteline or Eibach. Adjustable end links allow you to fine-tune the bar stiffness. On the R34, increasing front stiffness slightly over rear helps tame understeer.

Bushings and Control Arms

Replace all factory rubber bushings with polyurethane or spherical bearings. These reduce deflection under load and maintain alignment accuracy. Adjustable lower control arms, traction arms, and toe links let you dial in camber, caster, and toe settings for maximum cornering grip. Aim for –3° to –4° front camber and –2° to –3° rear camber on sticky tires.

Chassis Rigidity

Add a front strut brace and a rear trunk brace to stiffen the chassis. Many builders also install a bolt-in roll bar or half cage. This not only improves safety but also reduces chassis flex, allowing the suspension to work more predictably. The R34’s body is strong, but every bit of extra rigidity helps when you are pushing the car to its limit.

Engine and Drivetrain Tuning

The RB26DETT is a legendary engine, but it has its weaknesses: oiling, heat, and stock turbo lag. A comprehensive engine and drivetrain tune will unlock reliable power that lasts through a race weekend.

ECU Remapping and Engine Management

A standalone ECU such as a Haltech Elite 2500 or Motec M130 gives you full control over fuel, ignition, boost, and boost-by-gear. This is critical for tuning around larger turbos and higher boost levels. Have a professional tuner map the fuel tables using a wideband lambda sensor. Expect to see 500–600 wheel horsepower on pump gas with conservative timing, or more with E85. Haltech offers specific plug‑and‑play kits for the R34.

Turbocharger Upgrade

Factory RB26 turbos are small and heat‑prone. For track work, a pair of Garrett G25-660 or BorgWarner EFR 7064 turbos provide quick spool and excellent top‑end flow. Ensure you upgrade the wastegates (external, 42–45 mm) to control boost precisely. New manifolds and a dump pipe are recommended to eliminate factory choke points.

Intercooler and Intake

An upgraded front‑mount intercooler with a large core (e.g., HKS or GReddy) reduces intake air temperatures. Pair it with a cold‑air intake downstream of the intercooler exit. Consider adding water‑meth injection for additional charge cooling during hot sessions.

Exhaust System

A free‑flowing turbo‑back exhaust (3 inch or larger) improves spool and power. Use a system with a high‑flow metallic catalytic converter if emissions are a concern, or go catless for maximum flow. Full titanium systems from HKS save weight and handle heat.

Fuel System Upgrades

Higher horsepower demands more fuel. Fit a 525 lph or twin 450 lph in‑tank pump, 1000 cc or larger injectors, and an adjustable fuel pressure regulator. Run a fuel pressure gauge inside the cabin to monitor the system under load.

Transmission and Clutch

The factory Getrag 6‑speed is robust but the clutch must handle the increased torque. A twin‑plate or triple‑plate clutch from OS Giken or Exedy provides a manageable pedal feel while preventing slip. Upgrade the gearbox internals with billet shift forks and a reinforced syncro set if you plan to push beyond 600 hp.

Cooling and Heat Management

Engine bay heat is the enemy of consistent lap times. The R34’s radiator and oil coolers need to be upgraded to cope with track stress. Install a high‑efficiency aluminium radiator (Mishimoto, Koyo) with a high‑flow thermostat. Add a separate oil cooler with a thermostatic sandwich plate—target oil temperatures below 230°F. For track‑only cars, a power steering cooler and a differential cooler are wise additions. Wrap header and downpipes with exhaust wrap or thermal coating to keep radiant heat away from the intake and brake fluid.

Weight Reduction and Aerodynamics

Every kilogram counts on a track car. Remove the rear seats, carpet, sound deadening, audio system, and any non‑essential trim. Replace the hood with a carbon‑fibre unit (from Seibon or similar) and swap the front bumper for a lightweight version with integrated canards for downforce. A functional rear diffuser helps stabilize the car at high speeds. Keep the stock front splitter or upgrade to a deeper one to balance aerodynamic lift.

You don’t need massive wings—a subtle rear spoiler (GT‑R Nismo or APR) is sufficient for circuit work.

Wheels, Tires, and Data Logging

Your suspension and power are only as good as the contact patch. Choose forged wheels that are 18×9.5 or 10.5 inches to clear big brakes. Enkei RPF1s, Rays Engineering TE37s, or BBS E88s are proven choices. Fit 265/35R18 or 285/30R18 semi‑slick tires like the Yokohama Advan A052 or Hankook Ventus TD Z221. Data logging is a game‑changer: an AIM MXS or Racepak IQ3 dash with GPS logging helps you identify where you lose time.

Pair it with a laptop and software like Aim Race Studio or Motec i2 for post‑session analysis. Understanding your braking points, corner speeds, and throttle application is the final key to turning your R34 into a genuine competition weapon.

Putting It All Together

Building a track‑ready R34 GT‑R is a progressive process that rewards careful planning and quality parts. Start with the foundation—brakes and suspension—then move to engine tuning and drivetrain resilience. Include cooling, weight reduction, and aerodynamics to make your car faster and easier on consumables. Finally, invest in data logging to turn your seat‑of‑the‑pants feel into objective improvements. There are countless forums and build threads on GTR.co.uk and Skyline Owners Club where owners share their track setup experiences.

Use those resources to validate your choices before spending money. With the right approach, your R34 will not only be competitive—it will be a joy to drive at the limit.