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The 20R head has straight ports, so can flow better than the 22R head, improving high RPM power. The 20R head is a simple bolt-on modification for the pre-1985 block, but also requires the use of the 20R intake manifold, making it almost impossible (there's a lot of matching necessary) to use with the 22R-E EFI system. [21]
Toyota Variable Induction System, or T-VIS, is a variable intake system designed by Toyota to improve the low-end performance of multi-valve engines. [1]T-VIS is intended to improve the low-end torque of high-performance, four-stroke internal combustion engines - by changing the geometry of the intake manifold according to the engine rotation speed.
The engine is a 6.2-liter (378 cu in) Callaway-modified LS3 V8, powered by an Eaton supercharger with air/liquid intercooler integral to intake manifold. Maximum manifold pressure is 50 inches Hg, absolute. (10 psi (0.69 bar)), producing 650 bhp (SAE). The engine has a cast aluminum block and heads with six-bolt cross-bolted main caps.
In North America, the 20R 2.2-litre engine was used. The high-performance 2000GT Sedan and Hardtop Coupé with 18R-G twin cam engine were only offered in Japan. Yamaha supplied the alloy head for these high performance normally aspirated engines fitted with twin Mikuni-Solex 40 mm side-draft carburettors and a compression ratio of 9.7:1.
Other manufacturers may modify the engine after it has left the Toyota factory but the engine still keeps the original Toyota designation. For example, Lotus added a supercharger to the 2ZZ-GE in some versions of the Lotus Elise and Exige, but the engine is still labelled 2ZZ-GE, not 2ZZ-GZE. Examples: 3S-GTE 3S – Third model in the S engine ...
TPI Specialties was founded by Myron Cottrell, a professional engine builder, who had bought a new Chevrolet Corvette in 1985 and was intrigued by the potential for improvement in its Tuned Port Injection fuel injection system.