A good capture there Dario. It shows what can be done on a budget. I thought I would post up a capture using my DIY version based on an actual FLS. This link http://www.google.com/patents/US6484589 gives all the details in how to make your very own FLS and even gives suggestions on the preferred size of transducer to use. The one I have used is 30mm.
This capture is "98 Vectra C20SEL. Taken at the rail regulator. One injector disconnected. I haven't really played around with it that much and this is my first crack at a rail pressure drop. Turned out not to bad. Perhaps I should look deeper.
Fat Freddy wrote: It may not be pretty but is extremely sensitive.
FF
Hi, is not important how they look like, my DIY FLS doesn't look pretty good, but you know, as someone once upon a time said.
Looks like chicks at home :
Not pretty faces, but do the trick
Here you are another waveform sample:
Channel A is cylinder N 1 ignition voltage waveform. Channel D signal is from my DIY pressure sensor connected to the fuel pressure regulator diaphragm in order to monitor diaphragm movements as fuel rail pressure varies according to injectors switching