1985 Nissan Skyline R31: a complete guide to the legendary JDM

If you're interested in Japanese sports cars from the 80s... Nissan Skyline R31 The 1985 is one of those models that can't be ignored. This car became a bridge between classic Skyline 70s and revolutionary R32 early 90s, combining strict design, advanced technologies for its time and legendary engines of the series RB. In 1985 Nissan presented R31 as a response to the growing competition in the sports sedan class, and today this model is valued not only for its historical significance, but also for its enormous tuning potential.

Unlike its predecessors, Skyline R31 received an entirely new platform, independent rear suspension and optional all-wheel drive - innovations that made it one of the most balanced cars of its time. The version with a turbocharged engine stands out especially RB20DET, which became the basis for many racing and street projects. But what makes this car so special almost 40 years later? Let's figure it out.

Technical characteristics of the 1985 Nissan Skyline R31

Under the hood Skyline R31 1985 could have one of four engines, but the most desirable for enthusiasts was and remains RB20DET — 2.0-liter inline six-cylinder turbocharged engine. This unit developed 180 hp as standard, but its real potential was revealed after tuning. For comparison, the atmospheric version RB20DE produced a modest 155 hp, and the diesel LD28 - only 95 hp

The transmission was offered to choose from: 5-speed manual or 4-speed automatic. The drive could be rear-wheel drive (RWD) or complete (ATTESA in top versions). Front suspension - MacPherson, rear - multi-link, which ensured excellent handling. The braking system included disc brakes on all wheels, and in versions with a turbo engine, ventilated discs were installed.

Characteristics	RB20DET (turbo)	RB20DE (atmo)	CA18ET (turbo)
Volume, l	2.0	2.0	1.8
Power, hp	180	155	130
Torque, Nm	225	181	176
Drive type	RWD / AWD	RWD	RWD

I wonder what Skyline R31 became the first in the line to receive an electronic engine management system (ECU), which greatly simplified further tuning. Also in 1985, the option HICAS - a rear steering system that improved maneuverability at high speeds, but was later criticized for being too complex.

⚠️ Attention: If you are planning to buy Skyline R31 with the system HICAS, please note that disabling or deleting it requires flashing ECU and may affect handling. Many owners prefer to completely dismantle this system to simplify the design.

Design and interior: why the R31 looks so futuristic

Appearance Nissan Skyline R31 1985 was a real breakthrough for its time. Designers abandoned the angular shapes of previous generations in favor of streamlined lines and aerodynamic solutions. The front with narrow headlights and a massive bumper gave the car an aggressive look, and the rear with a high spoiler and vertical lights made it recognizable even from afar.

Inside the cabin R31 combines a sporty character with the comfort of a premium sedan. The instrument panel was fully digital on top variants and the steering wheel had a unique four-spoke design. Seats with good lateral support and high-quality finishing materials emphasized the status of the car. Interestingly, in Japan Skyline R31 positioned as a premium family car, but in Europe and Australia it was sold as a sports sedan called Nissan Leopard or Infiniti M30.

• 🔹 Unique exterior elements: "Whale Tail" spoiler, hidden wipers, chrome moldings
• 🔹 Interior features: digital instrument panel, electric seats, climate control (optional)
• 🔹 Color options: rare shades such as Midnight Purple or Silhouette Silver, are especially prized by collectors today

One of the most memorable design elements was the rear spoiler, which not only improved aerodynamics, but also became the calling card of the model. Today original spoilers R31 in good condition can cost several thousand dollars on the secondary market.

RB20DET engine: why it became a tuning legend

If we talk about Nissan Skyline R31, then it is impossible to ignore its main trump card - the engine RB20DET. This engine has become the basis for hundreds of racing and street projects due to its reliability, tuning potential and parts availability. Standard RB20DET produced 180 hp, but after modifications this figure could be increased to 400+ hp without loss of reliability.

The secret of success RB20DET lies in its design:

• 🔧 Cast iron cylinder block with high rigidity
• 🔧 Aluminum heads with two camshafts (DOHC)
• 🔧 Turbine Garrett T25 (in later versions - T28)
• 🔧 Electronic fuel injection with chip tuning capabilities

One of the main advantages RB20DET was its compatibility with other engines in the series RB. For example, a block from RB25DET (2.5 l) can be installed in place RB20DET with minimal modifications, which made it possible to increase the working volume and power. Also a popular upgrade was replacing the standard turbine with a more efficient one, for example, Garrett GT2860 or Tomei.

⚠️ Attention: When tuning RB20DET be sure to strengthen the gearbox - standard FS5R30A can withstand up to 300 hp, but with more power it will be necessary to install a reinforced clutch and, possibly, switch to Getrag or Holinger.

Install a larger intercooler|Update the fuel system (pump, injectors)|Flash the ECU to new parameters|Strengthen the transmission-->

Skyline R31 in motorsport: from group C to drifting

Nissan Skyline R31 not only was it a successful production car, but also left a bright mark on the history of motorsports. In the late 80s and early 90s, this model actively participated in racing Group A, where it competed with BMW M3, Ford Sierra RS500 And Toyota Corolla GT. The team’s performances were especially memorable Nissan Motorsport in the Australian championship, where pilots R31 repeatedly won prizes.

In Japan Skyline R31 became one of the first cars to be used in the emerging sport - drifting. Thanks to its rear-wheel drive, good balance and powerful engine, it was ideal for controlled drifts. Legendary Drifter Keiichi Tsuchiya started his career on R31, and later switched to more modern models. Well prepared today Skyline R31 can compete with modern drift cars, especially if it is equipped with a reinforced suspension and a powerful engine.

• 🏁 Group A races: victories in the Australian and New Zealand championships
• 🏁 Rally: participation in WRC in class Group N (limited modifications)
• 🏁 Drift: one of the first cars used in professional drifting

Fun fact: in 1987 Nissan released a special racing version Skyline R31 — HR31 GTS-R, which had a lightweight body, reinforced suspension and a 210 hp engine. Today these pieces are among the rarest and most expensive among collectors.

What is the HR31 GTS-R?

The HR31 GTS-R is a racing version of the Skyline R31, released in limited edition in 1987 specifically for participation in the Group A championship. It had a lightweight body (without rear seats and with aluminum doors), a reinforced braking system, improved suspension and an RB20DET engine with an increase to 210 hp. power. Only about 800 were produced and today they are valued at hundreds of thousands of dollars.

Problems and weaknesses: what to look for when buying

Despite its legendary status, Nissan Skyline R31 The 1985 has a number of common problems that you should be aware of before purchasing. Many of them are related to the age of the car and the specifics of Japanese engineering of the 80s. Here are the main points to pay attention to:

• 🔴 Corrosion: Rust often appears on arches, sills and suspension mounting points. Check the bottom of the doors and the trunk floor.
• 🔴 Engine RB20DET: camshaft wear, oil leaks through the valve cover, problems with the turbine (Garrett T25 often requires replacement after 150-200 thousand km).
• 🔴 Electronics: The digital dashboard may be glitchy, there may be problems with the wiring (especially where it passes through the body).
• 🔴 Suspension: wear of silent blocks, ball joints and shock absorbers. Rear control arms often require replacement.
• 🔴 Transmission: in automatic boxes (RE4R01A) the weak point is the torque converter. In mechanics (FS5R30A) — synchronizers for 2nd and 3rd gears.

Pay special attention to the condition HICAS (if it exists) - this system often fails, and its repair is expensive. Many owners prefer to completely remove it, but this requires reflashing ECU and improvements to the steering rack. Also check the work ATTESA (all-wheel drive), if there is one, faults in the transfer case or viscous coupling can make the car dangerous to drive.

⚠️ Attention: Upon purchase Skyline R31 Be sure to check the car's history for any accidents. Many examples have "twisted" mileage or were restored after serious accidents. This is especially true for cars imported from Japan - there they were often driven in an aggressive style.

Tuning and modifications: how to turn the R31 into a modern sports car

One of the main reasons for its popularity Nissan Skyline R31 among enthusiasts is its enormous tuning potential. Thanks to a simple design, a large number of spare parts and an active community, this car can be turned into a real monster for both the track and the street. Here are the main directions of modifications:

1. Engine and turbo kit

Standard RB20DET can be boosted to 300-400 hp. using the following upgrades:

• 🔧 Turbine installation Garrett GT2860-5 or Tomei M82
• 🔧 Replacement of the fuel system (pump Walbro 255, injectors Nismo 550cc)
• 🔧 Reinforced cylinder head with valves Tomei or JUN
• 🔧 Firmware ECU (popular Haltech, AEM, Link G4+)

2. Suspension and brakes

To improve controllability it is recommended:

• 🔧 Installation of coilovers Tein, BC Racing or KW
• 🔧 Reinforced anti-roll bars
• 🔧 Brake calipers Nismo or Brembo with perforated discs
• 🔧 Polyurethane silent blocks and suspension bushings

3. Exterior and interior

For a modern look:

• 🎨 Wide arches and body kit Rocket Bunny or Origami
• 🎨 LED optics and tail lights LED
• 🎨 Leather sports seats Bride or Recaro
• 🎨 Steering wheel Nardi or Momo with quick release mechanism

An interesting tuning option is an engine swap. Many enthusiasts install instead RB20DET more modern engines such as RB26DETT (from Skyline GT-R R32) or even 2JZ-GTE (from Toyota Supra). However, such a swap requires serious modifications to the body, suspension and electrical systems.

How much does a Nissan Skyline R31 cost today?

Price for Nissan Skyline R31 1985 depends on many factors: condition, equipment, ownership history and region. In Japan, where these cars can still be found in relatively good condition, prices start at $5,000–$10,000 per copy with mileage and a worn-out body. However, prices for truly clean and original cars can reach up to $30,000–$50,000, especially if these are rare versions such as HR31 GTS-R.

In other countries, such as Australia or New Zealand, where Skyline R31 was very popular, prices may be higher due to demand among collectors. In Europe and the United States, these cars are less common, and their value often depends on the legality of import and compliance with local standards.

Vehicle condition	Price, USD	Notes
Project (requires restoration)	3 000–8 000	Rust, faulty engine, missing parts
Good (runs, but needs some work)	10 000–20 000	Working engine, minimal corrosion, original interior
Excellent (collectible)	25 000–50 000	Low mileage, original paint, full service history
HR31 GTS-R or rare versions	50 000–100 000+	Limited Editions, Racing History, Mint Condition

Upon purchase Skyline R31 It is important to consider not only its condition, but also the cost of spare parts. Some parts, such as original bumpers, optics or interior elements, are very difficult to find today, and their price can be comparable to the cost of the car itself. It is also worth remembering that many spare parts (for example, for RB20DET) compatible with other models Nissan, such as Laurel or Cefiro, which simplifies the search.

⚠️ Attention: Upon import Skyline R31 into your country, check that it complies with local environmental regulations. In some regions (for example, California), installing catalysts or modifying the exhaust system may be required for legal operation.

FAQ: answers to frequently asked questions about the Nissan Skyline R31

Can the RB26DETT engine from the R32 GT-R be installed in the Skyline R31?

Yes, such a swap is possible, but it will require serious modifications:

• 🔧 Changing engine and gearbox mounts
• 🔧 Replacement of wiring and ECU (usually used Haltech or Link)
• 🔧 Modification of the exhaust system and fuel line
• 🔧 Strengthening suspension and brakes

Such a project will cost $15,000–30,000 (depending on the condition of the donor motor and components). Ready-made swap kits (for example, from SOS Performance) will simplify the task, but will still require professional installation.

What kind of oil should I put in RB20DET?

For RB20DET It is recommended to use high quality synthetic oil with a viscosity of:

• 🛢 10W-40 or 5W-40 for temperate climates
• 🛢 15W-50 for hot regions or extreme loads

Popular brands among owners: Motul 8100 X-Cess, Liqui Moly Leichtlauf, Castrol Edge. Replacement interval - every 5,000–7,000 km (or once a year), since turbocharged engines are more sensitive to oil quality.

How to distinguish the original Skyline R31 from a replica?

When purchasing, pay attention to:

• 🔍 VIN code - must begin with HR31 (for versions with RB20DET) or KR31 (for versions with CA18ET)
• 🔍 Vehicle data plate (usually located on the driver's door pillar)
• 🔍 Original body parts - for example, the shape of the front bumper and radiator grille is unique to R31
• 🔍 Documents - Japanese cars often have a service book (service book)

Be careful with cars imported from left-hand drive countries (such as Australia) - they may have been converted to right-hand drive, which reduces their collectible value.

How much does Skyline R31 weigh?

Weight Nissan Skyline R31 depends on the configuration:

• ⚖ Rear-wheel drive version (RWD) — 1,250–1,350 kg
• ⚖ All-wheel drive version (ATTESA) — 1,350–1,450 kg
• ⚖ HR31 GTS-R - about 1,200 kg (due to the lightweight body)

For comparison, Skyline R32 GT-R weighs about 1,430 kg, and Toyota Supra MK3 — 1,500–1,600 kg. Due to its relatively light weight, R31 even in standard configuration it shows good dynamics.

Can the Skyline R31 be used as a daily driver?

Theoretically yes, but there are several nuances:

• 🚗 Reliability: in good technical condition R31 can serve as everyday transport, but consider its age - breakdowns will occur more often than with a modern car.
• 🚗 Comfort: Compared to modern cars, sound insulation and ergonomics leave much to be desired.
• 🚗 Spare parts: Some parts (such as electronics or interior parts) may be difficult to find.
• 🚗 Fuel: RB20DET not too gluttonous (about 10–12 l/100 km in a mixed cycle), but requires high-quality gasoline (octane number not lower than 95).

Many owners use Skyline R31 as a second car - for weekends or track days, not for daily commuting.