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In 1984, Ford Motor Company Electronics Division began to develop a version of its (production) EEC-IV electronic engine control unit that could provide the precise monitoring and command functions needed for the company's new turbocharged 1.5 liter Formula One V-6 racing engine. The electronic engine control system was necessary to allow the new engine to operate reliably at the limit of its structural integrity, while producing a horsepower/liter ratio at. least 10 times that of typical production powerplants. Ford Electronics Division is now applying the lessons learned on three generations of racing EEC-IV units, for both turbocharged and naturally aspirated racing engines, to improve the performance and durability of its passenger vehicle engines. This paper: Acquaints engineers with the electronic configuration of the EEC-IV unit. Discusses engine monitoring, control and diagnostics features traded between racing and production applications.