Fast Facts:

• Extensively developed HR31 Skyline GTS-X with a built RB30/RB26 engine and Precision 6870 Gen 2 turbocharger

• Currently tuned to 800 hp at 28 psi running on E85, with a previous tune offering approximately 610 hp at 17 psi

• Fresh from a ground-up rebuild, with everything from the brake master cylinder to differential and drive shafts pulled down and rebuilt or replaced

• Currently on a run-in tune, with the seller offering to have it tuned ahead of sale

The Details:

This 1987 Nissan Skyline HR31 GTS-X is a comprehensively built, competition-style example of the JDM icon, benefitting from a fresh rebuild and a list of parts a mile long.

This 1987 HR31 Skyline started life as a GTS-X, with chassis number HR31-094874 visible both on the body and factory identification plate. The latter records its original specification with the RB20DET 1,998 cc engine, FS5W71C five-speed transmission and RC43 axle. Little of that original drivetrain remains, however, following one of the most extensive builds we’ve seen.

Reportedly built by Fenick Race Engines, the engine is based on a 3.0-litre RB30 bottom end using JE pistons, Nitto connecting rods, King Racing bearings, ARP hardware and an ASR Race/Circuit sump. This is topped by an RB26 cylinder head reportedly sourced from a low-mileage R34 GT-R engine and converted to a shimless valvetrain with A’PEXi V-Max 270-degree cams, upgraded springs and retainers, bronze valve guides and OS Giken adjustable cam gears.

Forced induction comes from a Precision 6870 Gen 2 turbocharger mounted to a Full-Race twin-scroll T4 exhaust manifold and controlled by twin TiAL MVR wastegates. A Hypertune plenum, throttle body and dual-feed fuel rail form part of an extensive intake and fuel system, with the car configured to run E85. 

• We understand the car to be currently tuned to 800 hp at 28 psi running on E85, with a previous tune offering approximately 610 hp at 17 psi. Following the latest rebuild, the engine remains on a run-in tune, with the seller offering to have it tuned ahead of sale.

Cooling is handled by a custom PWR cross-flow radiator with fabricated swirl pot and header tank. Fuel is supplied from a 35-litre JAZ cell through a Carter Black lift pump, custom surge tank, twin Pierburg 360 pumps and Bosch 1600 cc injectors. An Aviaid external oil pump, large Canton Accusump, Serck oil cooler and remote filtration also feature.

Engine management is by an Autronic SM4 ECU and 500R CDI, supplemented by an AiM MXL display and AiM Evo4 data logger. The car has also been completely rewired with Deutsch connectors and a firewall bulkhead connection, together with a custom fuse and relay system and carbon fibre switch panel. The engine loom can be disconnected at the firewall to simplify engine removal.

Power reaches the rear wheels through an R34 GT-T transmission rebuilt with a PAR straight-cut 1st-4th gearset, an OS Giken quad-plate clutch and an R200 differential fitted with a Cusco two-way LSD. The suspension, steering and brakes have received similarly extensive attention, with adjustable coilovers, revised front hubs and geometry, adjustable rear arms, Alcon four-piston front brakes and Brembo R34 GT-R rear calipers.

Externally, dry carbon flares with aluminium aircraft-style hardware from Pro-Bolt, an East Bear vented FRP bonnet and mirrors and a new-old-stock GTS-R-style front bumper accompany a custom black repaint with metallic flake. The seller describes the finish as presentable, with some small stone chips and marks evident.

The competition cabin is stripped of its original sound deadening and fitted with OMP WRC fixed back seats and harnesses, an OMP quick release steering wheel, bolt-in roll cage, fabricated aluminium rear firewall and door trims and a flocked dashboard. 

The HR31 is offered fresh from a ground-up rebuild, with items including the brake master cylinder, differential, driveshafts, pedal assemblies, cross-members and numerous supporting components rebuilt, renewed or refinished. The car is offered without service history and approximately 1,000 km reported since the rebuild. 

Full specification list

• Engine – short motor

  • Fresh 3.0-litre RB30-based engine

  • JE Pistons forged pistons

  • Nitto Performance Engineering connecting rods

  • Cometic MLS head gasket

  • ARP main stud kit

  • ARP RB26 head studs; block drilled and tapped to suit

  • King Racing Bearings

  • ASR Race/Circuit sump with external pickup

  • Enlarged oil returns and oil restrictors

  • Crankshaft oil galleries grub-screwed

  • Factory water-line ports tapped and factory lines replaced with Speedflow braided hose and fittings

  • RB25 knock sensors and loom

  • Dummy oil pump arrangement

  • Tuff Mounts engine mounts

• Cylinder head and induction

  RB26 cylinder head reportedly sourced from a low-kilometre R34 GT-R engine

  • Shimless valvetrain conversion

  • A’PEXi V-Max 270-degree / 11.4 mm-lift camshafts

  • Titanium valve springs and retainers

  • Cylinder head relieved for high-lift camshafts

  • Tomei cam-cap stud kit

  • OS Giken adjustable cam gears

  • Bronze valve guides

  • Factory valves

  • Cam covers modified for -12AN Speedflow fittings

  • OEM Nissan oil filler cap

  • Raw-finish Hypertune intake plenum

  • Hypertune dual-feed fuel rail

  • Hypertune throttle body retaining OEM throttle-position sensor

  • Hypertune boost clamp

• Turbocharging, intake and exhaust

  • Precision Turbo & Engine GEN2 PT6870 turbocharger with ceramic-coated turbine housing and V-band outlet

  • Full-Race twin-scroll T4 stainless exhaust manifold with twin wastegate outlets

  • Inconel manifold-to-turbo studs

  • Twin TiALSport MVR 44 mm wastegates

  • TRUST Type R blow-off valve

  • 4-inch aluminium intake

  • 3-inch aluminium intercooler piping with Hypertune clamps

  • Blow-off-valve recirculation to intake

  • 3.5-inch stainless-steel exhaust with 4-inch muffler

  • Flexible section and gearbox-crossmember support incorporated into dump pipe

  • Twin stainless screamer pipes

  • DEI heat wrap to dump and screamer pipes

• Fuel system

  • Configured to run on E85

  • Twin Pierburg 360-series fuel pumps with Speedflow fittings

  • Carter Black lift pump with custom aluminium mount

  • Weldon fuel filter

  • Bosch 1600 cc/min injectors

  • Aeromotive fuel-pressure regulator and gauge

  • Underbody fuel cooler with custom aluminium guard/mount

  • 1/2-inch aluminium feed and 3/8-inch return hard lines

  • Speedflow PTFE braided fuel hose throughout

  • 35-litre JAZ fuel cell with mounting kit and rollover vent

  • Custom aluminium surge tank

• Cooling system

  • Custom PWR cross-flow radiator

  • Custom aluminium swirl pot

  • Custom aluminium header tank

  • Speedflow PTFE braided breather lines

  • Bleed lines from cylinder head, radiator and swirl pot to header tank

  • -10AN lower-radiator/header-tank connection

• Lubrication system

  • Aviaid single-stage external oil pump

  • Canton Racing Products 3-quart Accusump oil accumulator for pre-oiling and surge protection; Canton continues to list its 3-quart Accusump system

  • Large Serck oil cooler

  • Remote oil-filter mount with K&N filter

  • Speedflow aramid-braided oil lines

• Engine management, instrumentation and electrical

  • Autronic SM4 ECU

  • Autronic 500R CDI ignition

  • AiM MXL dash display

  • AiM EVO4 data logger

  • Ross Performance Parts crank trigger and Hall-effect sensor

  • Ross Performance Parts cam trigger and Hall-effect synchronisation sensor

  • Ross Performance Parts Gold Series harmonic balancer with trigger wheel and drive mandrel

  • Honeywell fuel-pressure sensor

  • Honeywell oil-pressure sensor

  • Oil-temperature, coolant-temperature and intake-air-temperature sensors

  • Wideband AFR input to Autronic ECU via Innovate controller

  • Bespoke engine loom with Deutsch connectors and firewall bulkhead connection

  • Complete replacement body wiring loom using Deutsch connectors; seller advises no OEM wiring remains

  • Custom fuse panel with circuit breakers and relays

  • Carbon-fibre switch panel

  • Relay-controlled electrical isolator with cabin and external buttons

  • Wiring provision for three fuel pumps and future expansion

  • Lightweight battery mounted in cabin

• Transmission and driveline

  • R34 Skyline GT-T five-speed transmission converted to push-type clutch operation

  • Transmission fully rebuilt with PAR Engineering straight-cut synchromesh gearset

  • OS Giken quad-plate clutch

  • S14 200SX clutch master cylinder

  • Nismo clutch slave cylinder

  • Nismo gearbox mount

  • Braided clutch hydraulic line

  • New clutch master cylinder

  • Two-piece tailshaft

  • R200 differential

  • Cusco two-way LSD

  • Oversize billet rear stub axles and companion flanges

  • ARP rear wheel studs

• Brakes

  • TRUST GREX/Alcon four-piston front brake calipers

  • 332 x 32 mm front rotors

  • Pagid Blue front pads

  • Brembo R34 GT-R two-piston rear calipers

  • Braided brake hoses

  • Nissan N1 brake master cylinder, freshly rebuilt

• Suspension and steering

  • Angry Industries Emotion front coilovers currently fitted

  • QA1 double-adjustable rear drag coilovers currently fitted

  • R31HOUSE track-oriented coilover set reported to accompany the car

  • Whiteline sway bars, adjustable at the front

  • S14/S15 front hubs and uprights

  • Adjustable lower control arms with spherical bearings

  • Adjustable caster rods with spherical bearings

  • Manual steering rack with spherical-bearing tie-rod ends

  • Solid steering-column bush with high-tensile hardware

  • Cusco front and rear strut braces

  • SW Motorsport adjustable rear trailing arms for camber/toe

  • Solid rear subframe bushes

  • Solid rear differential mount

• Wheels and tyres

  • WORK Meister S1 3P three-piece wheels, 18 x 10.5-inch front and 18 x 11.5-inch rear; WORK confirms the Meister S1 3P as a three-piece wheel available in these width ranges

  • Toyo Proxes R888 285-section front tyres

  • Mickey Thompson 295-section rear drag radials

• Body and exterior

  • Ground-up rebuild with brake master cylinder, differential, driveshafts and other major assemblies reportedly rebuilt or replaced

  • Pedal assemblies, dashboard support structure and crossmembers stripped and powder-coated

  • Dry-carbon fibre wheel-arch flares secured with Pro-Bolt aircraft-style hardware

  • East Bear vented FRP bonnet

  • East Bear mirrors

  • New-old-stock GTS-R front bumper, inserts and grille

  • Custom black paint with heavy metallic flake

  • Repaint described by seller as presentable but not show-quality

  • Small stone chips noted

  • No known accident history reported

• Interior and safety equipment

  • OMP WRC fixed-back front seats

  • OMP side mounts on Bride seat rails

  • OMP harnesses

  • OMP steering wheel with quick-release hub

  • Bolt-in roll cage with harness bar; front section presently not fitted

  • Sound deadening removed

  • One-piece aluminium rear firewall and parcel tray

  • Aluminium door cards

  • Flocked dashboard, door cards and rear firewall

  • Carbon-fibre panels filling unused dashboard vents and original instrument-cluster opening

• Supplied/not currently fitted or tuning equipment

  • R31HOUSE track coilover set

  • Front section of bolt-in roll cage

  • Six exhaust-gas thermocouples used for individual-cylinder tuning/data logging, reportedly not currently installed

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