|RADICAL 80'S From OPTION [October, 2006]||TOP > FEATURE > RADICAL 80'S > FAIRLADY Z 200 ZR-II|
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|Contact: ULTIMATE http://www.ultimate.co.jp|
|Great balance of cost and performance|
| In the era when the VG20ET equipped ZG/ZS/Z models were released, the Z31 200ZR I/II was given birth. In these 200ZRs, the chassis was graced with the new RB series engines specifically the straight 6 cylinder RB20DET. These engines were later known to be adopted into the Nissan Skyline models. There were two body models to choose from, the 200ZRI came with the normal roof and the 200ZRII were in the T-top form.
According to an US established firm NDI (Nissan Design International), they had decided to make some changes to the 1986 model Fairlady. The exterior was attempted to be made more glamorous than their counterparts, and the 300ZR (VG30DE) was introduced.
With a long history of the Fairlady, Ultimate decided to swap in a RB25DET intro their 200ZRII for daily driving and more power.
Mr. Takakamo from Ultimate states “Investing in an RB20 series engine is great to make lots of power. However, rather spending the money to correctly build the engine and simply sticking an oversized turbo onto the motor, the engine will result in an unbalanced horsepower monster. It's a different story with the RB25. in the stock form, it has plenty of torque, and more power can be easily produced. It's also significantly stronger than the RB20, and proper maintenance produces great benefits. The cost and efficiency is intelligently balanced, making this engine a realistic setup for many enthusiasts. The straight 6 cylinder engine and the overall rigid chassis hardly ever need any modifications in the first place.”
| The RB25 was picked off of an ECR33. A Trust surge tank, HPI exhaust manifold, a Q45 throttle body and a GT2540 had been added to the motor. The compression was reset to 8.6:1 with a 1.8mm headgasket, and 0.9 bar of boost produces 300 horsepower with this setup.
The entire wiring system of the vehicle had been relined to accommodate to the stock ECR33 ECU. The regular Z31 harness will work but cannot regulate the camshaft settings so without the new wiring harness, the full potential of the RB25 cannot be achieved.
Compared to the RB25, the RB26 series engines are not so much a great candidate for a donor. Swapping this engine requires such special attention as the piping layout and body modifications, increasing the more cost. For daily use and occasional spirited driving, the RB25 should be enough with around 300~400hp on tap. To say which setup is better all depends on the person's tuning needs and the purpose of the vehicle.
One thing that the enthusiasts should not forget is that the Z31 is not exactly a new car. It gets older by the minute, and these generation vehicles require further maintenance than others. By taking care of each issue the vehicle may have, a long and prosperous relationship between this car and driver will flourish which is one of the perks of owning an 80s vehicle.
|The owner of this Z31 chose to keep the exterior simple and stock since he likes the original design of the car. Since Z31 parts are hard to come by these days, the owner finds it difficult to find good products.||The vehicle originally came with a 6 cylinder engine, so space wise, fitting the new 6 cyl wasn't an issue. The air filter, surge tank, and the front pipes were all custom made.|
|An R33 transmission and propeller shaft was used, with the stock Z31 differential. The bolting flange on the differential was modified to fit, rather than modifying the driveshaft itself.||The front and rear suspension was fitted with Ultimate's original components. The rear was entirely changed to a coilover setup. Z32 calipers and rotors including the hub was installed on the front.|
|The interior was left as simple as possible. The gauges and the fan switches were installed to keep that simplicity in good flow with the rest of the design.||A full stereo system such as the amplifier and Carozzeria speakers had been installed. The vehicle usually has a subwoofer system but since the owner is looking for a new setup, it had been taken out.|
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