![]() ![]() Fuel efficiency and emissions were optimized by balancing fuel delivery to each individual cylinder. This was especially important to help meet the ever-tightening emissions laws. Unlike previous carburetors (including the computer-controlled varieties), the TPI system offered precise metering of the fuel under all operating conditions. While the earlier Cross-Fire (and TBI) injection introduced fans to the merits of electronic fuel injection, it was TPI that launched the modern EFI performance era back in '85. Fans of Tuned Port Injection will remember that the final small-block came equipped with a modern direct-port fuel injection. ![]() Prior to that, the final configuration was code named L98. ![]() Before Chevy introduced the current LS1 architecture, it offered an intermediate update to the original Mouse motor in the form of the LT1 (and more powerful LT4). ![]()
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