After I read Dario's post using a DIY FLS, instead of derailing Hexibot43 thread topic10159-20.html
I thought I would start a new one.
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.