Toyota 1JZ

Toyota 1JZ

1JZ

The 2492 cc 1JZ version was produced from 1990 to 2007 (last sold in the Mark II BLIT Wagon and Crown Athlete). Cylinder bore was 86 mm (3.39 in) and stroke was 71.5 mm (2.81 in). It was a 24-valve DOHCengine with two belt-driven camshafts.

1JZ-GE

Output for the non-turbo 1JZ-GE was 200 PS (147 kW; 197 bhp) at 6000 rpm and 251 N·m (185 lb·ft) at 4000 rpm.

Like all JZ-series engines, the early 1JZ-GE is designed for longitudinal mounting and rear-wheel-drive. All of these models also came with a 4-speed automatic transmission as standard; no manual gearbox option was offered.

1JZ-GTE

The first generation 1JZ-GTE employs twin CT12A turbochargers arranged in parallel and blowing through a side-mount or front mount air-to-air intercooler. With an 8.5:1 static compression ratio, the factory quoted power and torque outputs are 280 metric horsepower (210 kW) at 6200 rpm and 363 newton metres (268 lbf·ft) at 4800 rpm respectively. The bore and stroke are the same as for the 1JZ-GE: 86 mm (3.39 in) bore × 71.5 mm (2.81 in) stroke. Yamaha may have had a hand in the development or production of these motors (possibly the head design), hence the Yamaha badging on certain parts of the motor, such as the cam gear cover. In 1991, the 1JZ-GTE was slotted into the all-new Soarer GT.

The early generation 1JZ-GTEs combined the inherent smoothness of an inline 6-cylinder engine with the revving capacity of its short stroke and early power delivery of its small, ceramic wheeled turbochargers. The ceramic turbine wheels are prone to delamination in the setting of high impeller rpm and local temperature conditions, usually a result of higher boost. The first generation 1JZs were even more prone to turbo failure due to there being a faulty one-way valve on the head, specifically on the intake cam cover causing blow-by gases to go into the intake manifold. On the exhaust side, a decent amount of oil vapor flows into the turbos causing premature wear on the seals. The later second generation engines had this problem fixed and in Japan there was actually a recall in order to repair the first generation engines, though that does not apply to 1JZs imported to other countries. The fix is simple, and involves replacement of the PCV valve (2JZ); all parts are available through Toyota.

The third generation of the 1JZ-GTE was introduced around 1996, still as a 2.5-litre turbo, but with Toyota’s BEAMS architecture. This included a reworked head, newly developed continuously variable valve timing mechanism (VVT-i), modified water jackets for improved cylinder cooling and newly developed shims with a titanium nitride coating for reduced cam friction.[3] The turbo setup changed from parallel twin turbo (CT12x2) to a single turbo (CT 15B). The single turbo is in part made more efficient by the use of smaller exhaust ports in the head, this allows the escaping exhaust gasses to have more velocity as they exit the head, which in turn, spools the turbo faster and at lower RPM, but ultimately limits maximum horsepower that the head can possibly make without modification, because it cannot flow enough at higher RPM and higher boost pressures. (Most tuners report difficulty achieving more than 300rwkW on a VVT-i engine.) The adoption of VVT-i and the improved cylinder cooling allowed the compression ratio to be increased from 8.5:1 to 9.0:1. Even though the official power figures remained at 280 metric horsepower (210 kW) at 6200 rpm, torque was increased by 20Nm to 379 newton metres (280 lbf·ft) at 2400 rpm. These improvements resulted in increased engine efficiency that reduced fuel consumption by 10%. The adoption of a much higher efficiency single turbocharger than the twins as well as different manifold and exhaust ports were responsible for most of the 50% torque increase at low engine speeds . This engine was used primarily in Toyota’s X chassis cars (Chaser, Mark II, Cresta, Verossa), the Crown Athlete V (JZS170) and in the later JZZ30 Soarer, as the JZA70 Supra was long discontinued by this time.

Applications:

  • Toyota Chaser/Cresta/Mark II Tourer V (JZX81, JZX90, JZX100, JZX110)
  • Toyota Soarer (JZZ30)
  • Toyota Supra MK III (JZA70, Japan only)
  • Toyota Verossa
  • Toyota Crown (JZS170)
  • Toyota Mark II Blit

1JZ-FSE

In around 2000, Toyota introduced what are probably the least recognised members of the JZ engine family – the FSE direct injection variants. These FSE 1JZ and 2JZ engines are aimed at achieving minimal emissions and fuel consumption together with no loss of performance.

The 2.5-litre 1JZ-FSE employs the same block as the conventional 1JZ-GE; everything up top, however, is unique. The ‘D4’ FSE employs a relatively narrow angle cylinder head with swirl control valves that serve to improve combustion efficiency. This is necessary to run at extremely lean air-fuel ratios around 20 to 40:1 at certain engine load and revs. Not surprisingly, fuel consumption is reduced by around 20 percent (when tested in the Japanese 10/15 urban mode).

Interestingly, normal unleaded fuel is enough to cope with the FSE’s 11:1 compression ratio.

The direct injection version of the 1JZ generates 147 kW (200 PS; 197 hp) and 250 N·m (184 lb·ft) – virtually the same as the conventional VVT-i 1JZ-GE. The 1JZ-FSE is always used with an automatic transmission.

Applications:

  • Mark II
  • Brevis
  • Progres
  • Verossa
  • Crown
  • Toyota Mark II Blit
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