![]() ![]() The turbo setup changed from parallel twin turbo (CT12x2) to a single turbo (CT 15B). The "thirrd Generation" of 1JZs were introduced around 1996, still as a 2.5 turbo, but with a reworked head incorporating Toyota's 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. The fix is simple, and involves replacement of the PCV valve (2JZ) all parts are available through Toyota. ![]() The later 2nd Gens had this problem fixed and in Japan there was actually a recall in order to repair the 1st Gens, though that does not apply to 1JZ's imported to other countries. Also on the exhaust side a decent amount of oil vapor flows into the turbos causing premature wear on the seals. The first generation 1JZ's 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 to go into the intake manifold. 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 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. In 1991, the 1JZ-GTE was slotted into the all-new Soarer GT. 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. These motors are over square (86.0mm bore x 71.5mm stroke). 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 ft The 1JZ-GTE employs twin CT12A turbochargers arranged in parallel and blowing through a side-mount or front mount air-to-air intercooler. Yamaha badging on cam gear cover of the 1JZ-GTE ![]()
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