[mwebb]

photo of the setup with ATS venturi tip ,
exhaust flows thru the venturi tip and the sensor is connected to a tube that bisects , measuring flow NOT pressure
in theory anyway
with laptop and Pico 6 on the passenger's seat


zoomed screen cap , the exhaust pulses are the blue trace
at cruise , part load probably around 45mph

to the right side , blue trace , pulses are lined up well with little to no hash in this system in this car at cruise - at this load at this rpm
i am thinking that that is what is desired in the exhaust pulse train when everything is working at or near optimum efficiency .

the FLS sensor is a pressure differential sensor , it measures change in pressure
it uses a piezoelectric sensor inside -


UNzoomed , different scope and tool using a low pressure transducer
yellow trace is exhaust pulses
synced on secondary spark on cylinder 1
same car same setup

low pressure Dips are long line misfires as exhaust valve opened on vacuum because there was no combustion event