Nissan Skyline R31: The Legend of RB Engines and Getzer Design

When it comes to Japanese sports sedans from the 1980s, it's Nissan Skyline R31 holds a special place in the hearts of collectors and enthusiasts. This car bridged the gap between the classic Skyline era and the modern turbocharged era, introducing a revolutionary engine line-up to the series RB. The design, developed under the direction of Gunter Goetzer, looks fresh even today, combining angular shapes and aerodynamic efficiency.

For many fans JDM (Japanese Domestic Market) this model remains an engineering benchmark, where mechanical reliability is harmoniously intertwined with tuning potential. If you are planning to purchase this car, you need to deeply understand its design features to avoid common mistakes when buying a used one.

History of creation and unique body design

Presentation Nissan Skyline R31 took place in 1985, and it came as a real shock to the conservative market. In contrast to the smooth lines of the predecessor R30, the new body received sharp, angular edges, which was dictated by the desire to improve aerodynamics and reduce the drag coefficient to 0.33. This geometry allowed the car to look aggressive and futuristic, anticipating the style of the 90s.

The designers paid special attention to the optical system. The headlights were rectangular in shape with rotating elements, which was an innovation for that time. The interior trim has also undergone changes: the ergonomics have become more driver-friendly, and the dashboard has become informative and clear. Quality of materials inside the cabin corresponded to the premium segment, which made it stand out R31 against the background of competitors.

The body range included a sedan, coupe and station wagon Wagon, each of which had its own unique features. However, it was the sedan that became a symbol of the era, thanks to its versatility and sporty character. A unique feature of the R31 was the introduction of the HICAS active suspension control system, which first appeared on this model.

Legendary RB series engines

With my heart Nissan Skyline R31 became a new series of engines RB, which replaced the outdated L and F motors. The main feature of these units was a cast-iron cylinder block, providing high strength with significant overheating, and a gas distribution mechanism distributed along the top DOHC. It was this design that laid the foundation for subsequent successes Nissan in motorsport and tuning.

Basic versions were equipped with naturally aspirated engines RB20E and RB20DE, which offered excellent traction and reliability. However, the real hit was the turbocharged RB20DET, which could develop power up to 190 stock horsepower. Thanks to the system NEO (Nissan Engine Overhead), these engines had a high compression ratio and were characterized by smooth operation.

The pinnacle of this generation's engineering is the GTS-R, equipped with a motor RB20DET-R. This unit featured a turbine CT15B and the system AVCS (Active Valve Control System), changing valve timing. In combination with a manual transmission, this allowed the car to accelerate to 100 km/h in less than 7 seconds, which was a phenomenal performance for a production sedan of that time.

• 🚀 RB20DET - classic turbo engine with potential up to 400 hp without replacing the block.
• ⚙️ RB20DET-R - special version with small cross-section turbine for instant response.
• 🔧 RB25 - a larger engine, available on later versions with increased torque.

Control technologies and transmission

One of the key features Nissan Skyline R31 became a system HICAS (High Capacity Active Steering). This system allowed the rear wheels to turn a small angle in opposition to the front ones at low speeds and synchronously at high speeds. This significantly improved maneuverability in corners and stabilized the car during sudden lane changes.

The transmission was offered in two versions: manual 5-speed and automatic 4-speed with the system TESS (Transmission Electronic Shift System). Mechanics were preferable for drive enthusiasts, providing clear gear shifting and a direct connection to the road. The automatic was more comfortable for city driving, but suffered from slower response.

The suspension was built according to the scheme Double Wishbone on all four wheels, which provided excellent kinematics and traction. The shock absorbers and springs were tuned for a sporty feel, but did not lose comfort on bad roads. Braking system, especially on versions GTS, included ventilated discs at the front and disc brakes at the rear.

⚠️ Attention: The HICAS system on older vehicles may require replacing the hydraulic pump and checking the wheel angle sensors, as a malfunction of this system makes steering unpredictable.

Features of operation and typical problems

Despite the reputation of a reliable car, Nissan Skyline R31 has a number of age-related problems that must be taken into account during maintenance. The weakest part of the engine RB is the cylinder head, which is prone to overheating and subsequent deformation. Therefore, monitoring the coolant temperature is the owner’s No. 1 priority.

Body corrosion is also a serious problem, especially for vehicles that have been driven in areas with salty roads. The sills, arches, bottom and shock absorber mounts are rotting. Inspection on a lift is mandatory, as rust can be hidden under layers of paint and sound insulation. Bottom condition often determines the value of a car on the secondary market.

The electrical system can also fail: oxidation of connectors, wear of wiring and failure of control units. Original oxygen sensors and ignition systems require regular diagnostics. If you notice unstable engine idling, check the valve ISC and system EGR.

• 💧 Oil leak from under the valve cover - a common problem that can be solved by replacing the gasket.
• ⚙️ Turbine wear on supercharged versions, requiring replacement of bearings or the entire volute.
• 🔌 Mass oxidation engine, leading to charging and starting problems.

GTS-R modifications and sporting heritage

Version GTS-R was created for homologation in Group A of Japanese touring. In total, approximately 1000 copies, which makes them extremely rare and expensive collectibles today. Particular attention was paid to lightweighting the body: aluminum hoods and doors were used, as well as special sports seats.

Engine RB20DET-R this version had a unique ECU and turbine tuning, which ensured peak power in the high rpm range. In combination with shortened gear ratios in the gearbox, GTS-R showed phenomenal acceleration dynamics. It was a real racing car, adapted for public roads.

Salon GTS-R featured a sports steering wheel Nardi, turbocharger counter and special door sills. The interior was restrained but functional, with an emphasis on the driver's seat. Historical value This model continues to grow every year, making it a coveted target for collectors.

⚠️ Attention: When purchasing the GTS-R version, be sure to check the VIN number and nameplate matching, as the market is flooded with fakes and converted regular R31s.

What is the difference between RB20DET and RB20DET-R?

The main difference is the type of turbine and phase control system. The RB20DET-R uses a smaller cross-section CT15B turbo for quick response, as well as an AVCS system that varies valve timing depending on the speed. The regular RB20DET has a simpler turbo and no AVCS, making it less punchy at low revs but more reliable in the long run with aggressive tuning.

Table of technical characteristics of the main versions

For a visual comparison of the capabilities of various modifications Nissan Skyline R31 Here is a summary table of characteristics. This data will help you understand the difference between naturally aspirated and turbocharged versions, and also choose the best option for your purposes.

Model	Engine	Power (hp)	Torque (Nm)	Acceleration 0-100 km/h (sec)
GL	RB20E (2.0L SOHC)	120	172	10.5
GTS	RB20DE (2.0L DOHC)	150	186	8.8
GTS-T	RB20DET (2.0L Turbo)	190	250	7.2
GTS-R	RB20DET-R (2.0L Turbo)	210	255	6.8

Please note that acceleration figures may vary depending on vehicle condition and operating conditions. Turbocharged versions show significant performance gains over their naturally aspirated counterparts, especially in the mid-range.

Tips for restoration and tuning

If you decide to restore Nissan Skyline R31, start by diagnosing the condition of the engine and body. Replacing the timing belt and water pump is a mandatory procedure for any engine repair. RB. It is also recommended to check the condition of the crankshaft and camshaft seals, as replacing them may require removing the engine.

Tuning R31 can be aimed at both increasing power and improving handling. To begin with, you should replace the standard exhaust system with a sports one, install a larger intercooler and reflash the ECU. This will give an increase in power without radical intervention in the engine design.

The suspension can be modified by installing adjustable shock absorbers and shortened springs. To improve traction, special sports tires and camber bolts are suitable. Balancing wheels and wheel alignment must be performed with high precision to unlock the potential of the system HICAS.

• 🔩 Replacing the timing belt every 60 000 km - critical to prevent cliffs.
• 🌡️ Intercooler installation will reduce the charge air temperature and increase power.
• 🛠️ Interior restoration By replacing the upholstery and seats, the car will be restored to its former luxury.

Compatibility of spare parts with other models

Many parts of the RB20 engine are compatible with the R32 and R33 models, but there are some differences with attachments and electronics. Gearboxes from the R32 may be suitable, but will require adaptation of the driveshaft and oil seal. The R31 suspension is unique and is not interchangeable with other generations without major modifications.

Conclusion and prospects of ownership

Nissan Skyline R31 remains one of the most attractive entry points into the world of classic Japanese sports cars. Its price on the secondary market is still affordable compared to later generations, but demand for quality examples is growing. Owning this car is not just using transportation, but participating in the living history of the automotive industry.

Regular maintenance and careful operation will allow you to enjoy driving this car for many years. Unique atmosphere interior, engine sound RB and steering response create unique emotions that are difficult to find in modern cars.

If you're looking for a car with character that can be customized to suit your needs, R31 will be an ideal choice. The main thing is to approach the purchase wisely and carefully check all components and assemblies before the transaction.

⚠️ Attention: When storing the car for a long time, it is recommended to remove the battery and use anti-theft devices, since the electronics R31 vulnerable to vandalism and theft.

Frequently Asked Questions

Which motor is more reliable: RB20E or RB20DET?

Both engines are very reliable provided they are maintained promptly. Atmospheric RB20E is considered simpler and more durable due to the absence of a turbine and complex pressurization systems, but RB20DET also has a long service life when the pressure is adjusted correctly.

Is it difficult to find spare parts for the R31 in Russia?

Finding new original parts can be difficult, but the market for used parts and analogues is quite extensive. Many components are compatible with other models Nissan, which simplifies the search. Specific body and interior elements often have to be ordered from Japan.

Can HICAS be installed on the regular version?

This is technically possible, but requires replacing the subframe, rear suspension arms, steering gear and related electronics. This is a complex and expensive procedure that is often not worth the cost.

How often do you need to change the timing belt on an RB engine?

It is recommended to change the timing belt every 60 000 km or once every 4-5 years, depending on the year of manufacture and condition. Also be sure to change the tension pulley and water pump at the same time as the belt.