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Hi all, I have searched high and low on the internet for the meaning of this data pids name, I have a 94 firebird lt1 and my snap on verus shows a left and right BPW(ms) data pid, the only acronym I can find is break pulse modulation but the pid kinda is similar to my rpm pid, anyone know what this means? obd1
Base Pulse Width (milliseconds)?
GM: Base Pulse Width (BPW)Ideally, n = PV /RT and then injector pulse = n / injector flow constantGM introduce the concept of “Base Pulse Width” or BPW to reduce the “V” and “R” terms. Basically, the BPW is how long the injectors need to be open in order to fill cylinders at 100% volumetric efficiency at a standardized temperature. The BPW is then multiplied by the Volumetric Efficiency table (which is no longer a VE table in the ideal sense of the word) to determine fueling at different load and RPM conditions. This is then modified further by coolant and intake air correction tables to account for temperature. This cuts the number of math operations more or less in half. The idea behind Speed-Density is being applied in a way that is less math-intensive.
Base Pulse Width (milliseconds)?
GM: Base Pulse Width (BPW)Ideally, n = PV /RT and then injector pulse = n / injector flow constantGM introduce the concept of “Base Pulse Width” or BPW to reduce the “V” and “R” terms. Basically, the BPW is how long the injectors need to be open in order to fill cylinders at 100% volumetric efficiency at a standardized temperature. The BPW is then multiplied by the Volumetric Efficiency table (which is no longer a VE table in the ideal sense of the word) to determine fueling at different load and RPM conditions. This is then modified further by coolant and intake air correction tables to account for temperature. This cuts the number of math operations more or less in half. The idea behind Speed-Density is being applied in a way that is less math-intensive.
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