May 4, 2008
Toyota JZ Engine
Toyota JZ engines come both turbo and naturally aspirated and in two displacement variations - a 2.5L and 3.0L inline-6 cylinder configuration. Known for being the heart of the Toyota Supra, the JZ engine powers all of Toyota’s sports cars and has a wide variety of aftermarket upgrades. The JZ engine replaced Toyota’s M-series inline-6 engine and continues to be a favorite of import tuners. The Toyota 2JZ-GTE engine is seen as the rival to Nissan’s legendary RB26DETT, as both stock engine blocks can handle up to 1000 horsepower (745 kW).
The naturally aspirated 2.5 liter engine is known as the 1JZ-GE and produces 200 horsepower (147 kW) at 6000 rpm and 185 ft. lbs of torque (250 Nm) at 4000 rpm. The turbocharged 1JZ-GTE engine uses two CT12A turbos and a side-mounted air-to-air intercooler to produce 280 horsepower (206kW) at 6200 rpm and 267 ft lbs of torque (363 Nm) at 4800 rpm.
Around 1996, Toyota released a reworked 1JZ-GTE engine that featured a single CT15B turbo design. The new engine had a new head incorporating Toyota’s continuously variable valve timing mechanism (VVT-i), modified water jackets for improved cooling, newly developed shims with titanium nitride coating for reduced cam friction, and increased compression ratio from 8.5:1 to 9.0:1. Officially, horsepower remained the same at 280 hp, but torque was increased to 279 ft lbs (379 Nm) from the original 267 ft lbs (363 Nm) at 2400 rpm.
The 3.0L 2JZ engine was first released in the 1992 Lexus SC 300. Horsepower for the naturally aspirated 2JZ-GE ranges from 215 to 230 hp (158 to 169 kW) at 5800 to 6000 rpm and 209 to 220 ft lbs of torque (283 to 298 Nm) at 3800 to 4800 rpm. Two CT12B turbochargers raise the power of the 2JZ-GTE engine to the former Japanese industry maximum of 280 horsepower (206 kW) at 5600 rpm and 332 ft lbs of torque (451 Nm) at 3600 rpm.
A German engineering firm, Johann A. Krause Maschinenfabrik GmbH, originally designed the 2JZ-GTE for the Toyota Aristo. Toyota’s goal was to meet production car homogolation requirements for the former All-Japan Grand Touring Car Championship.
North American and European automotive markets received a more powerful 310 horsepower (229 kW) at 5600 rpm 2JZ-GTE engine. The power gain is due to a different stainless steel turbo shaft instead of the ceramic Japanese shaft, improved camshafts, and larger injectors at 550 cc/min instead of 440 cc/min. Since the primary mechanical difference between the exported CT12B turbocharger and Japan’s CT20A is the easily replaced turbo shaft, you can replace the Japanese-spec ceramic shaft with the steel shaft from CT12B turbo.
The 1.5JZ is not a production engine and is created by combining a 1JZ head with a 2JZ engine block. The 1JZ cylinder head will bolt directly onto the 2JZ block and allows for an additional 500cc of displacement.
Toyota Cars with JZ Engines:
Toyota Altezza /Lexus IS 300
Toyota Aristo /Lexus GS 300
Toyota Chaser/Cresta/Mark II Tourer
Toyota Soarer /Lexus SC 300
Toyota Supra MK IV