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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.
The LB9 "Tuned Port Injection 5.0L" was introduced in 1985. At its core was the stout L69 shortblock and it used the same aggressive L69 camshaft profile. The induction system was unlike any system used previously by GM.
This engine is referred to as the Series I 3800, or 3800 TPI (Tuned Port Injection). In Australia, the LN3 was also replaced by the L27 by Holden who used the engine in their series 2 (1991) VN Commodore range. However, the Australian L27 retained the LN3's one piece upper intake and lower plenum.
Multi-point injection (also called 'port injection') injects fuel into the intake ports just upstream of each cylinder's intake valve, rather than at a central point within an intake manifold. [17] Typically, multi-point injected systems use multiple fuel injectors, [ 18 ] but some systems, such as GM's central port injection system, use tubes ...
In 1985 Cottrell bought a new Chevrolet Corvette and was intrigued to learn how its Tuned Port Injection system worked. After determining that the system could be improved significantly, Cottrell established his company, TPI Specialties, and began building and marketing aftermarket parts kits for hot rodders. [1]
The LB9 Tuned Port Injection (TPI) 305 was released, using a tuned runner design. The LB9 produced 210 hp, which brought it suitable attention from buyers despite being unavailable with a manual transmission.
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Also called the 'Big Doggie', the ZR2 is a concept model based on a C4 Corvette, but with a much larger 7.4 L (454 cu in) big block OHV V8 engine with multi-port fuel injection similar to the tuned port injection found on the 1985–1991 base model and a 6-speed manual transmission. [24] [25]