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Empirical rules for relating location of peak cylinder pressure to ignition advance at Maximum Break Torque (MBT) may be used to optimize either engines or fuel. Understanding the influences of several variables on overall burning time is possible by resorting to suitable instrument and data acquisition systems, non-standard on Cooperative Fuel Research engines (CFR engines). This work describes general aspects of the CFR engine instrument set updating aiming at reducing operator influence on measurement results, while also allowing overall burning time measurement and assessment of correlated variables influencing the combustion duration. A programmable Electronic Control Unit (ECU) operating under closed loop conditions, digital temperature controllers and a data acquisition system were retrofitted on a CFR engine.