![]() ![]() ![]() You'll also need an additional PCM file: $EE for the '94-'95 LT1/L99 $DA3 for the '93 LT1 F-Body or $DA2 for the '92-'93 Y-Body (Corvette), which will cost you an additional $19.95 from TunerCat. It is a great program, also known as Computer Automotive Tuning Systems (C.A.T.S.), which allows the above things to be done, all for only $69.95. TunerCat is your first step, the program I recommend to read your current PCM image, change its contents, and then reupload it to your PCM. There are three basic items necessary to tuning your own LT1 (or other GM) PCM: They can measure up to 2x the apmospheric pressure(29.4psi), so that means it can measure up to 14.7psi boost(the atmosphere is 14.7psi + 14.7psi from the turbo/supercharger).ģ Bar MAP sensors can measure up to 44.1psi, which translates to 29.7psi boost from a Turbo/supercharger.After payment, the 20+ page printable PDF of these free online tips will be emailed to you. This flexing causes a change in resistance and the circuitry inside the sensor converts this to a voltage ranging from 0.02V to 4.94V when the output is pulled up towards 5V by the ECM(Electronic control module).ġ Bar MAP sensors are used on NA(naturally asperated) vehicles.Ģ Bar MAP Sensors are used on forced induction vehicles(Turbo & Supercharged). It is mounted with a perfect vacuum beneath the chip so that the air pressure from the other side flexes the chip. ![]() It uses a silicon wafer that is thinner in the center (0.001") than around the edges (0.045"), which causes it to act as a diaphram. It is also used to help adjust the IAC(Idle Air Control) motor during idle. This information is used to determine the density of the air entering the combustion chamber (in conjunction with the IAT(Intake Air temperature) sensor), which is used when calculating the proper air/fuel mixture for the engine, especially at WOT since the system is not in closed-loop at this time. The logic module uses the manifold absolute pressure (MAP) sensor to determine the absolute pressure (not the relative to atmospheric pressure) of the air inside the intake manifold and the atmosphere (barometric pressure). ![]()
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