DIY First Look Senx Sensor

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Fat Freddy
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DIY First Look Senx Sensor

Post by Fat Freddy » Sun Feb 08, 2015 6:21 am

After I read Dario's post using a DIY FLS, instead of derailing Hexibot43 thread http://www.picoauto.com/support/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. :shock:
Injectors I.psdata
(2.56 MiB) Downloaded 183 times
Cheers
FF
Injector.gif

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Fat Freddy
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Re: DIY First Look Senx Sensor

Post by Fat Freddy » Sun Feb 08, 2015 12:29 pm

Oooppps!!! Sorry didn't put up the link. It's now there.

FF

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sigoaprendiendo
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Re: DIY First Look Senx Sensor

Post by sigoaprendiendo » Sun Feb 08, 2015 10:43 pm

Hi FF:

Thanks for posting your insights

This is the guy I was talking about, My DIY FLS close up:
DIY_Pressure_Sensor_1.jpg
Easy to build and fast response enough to keep an eye on the subtle changes from the tail pipe
And this is a waveform sample from the tail pipe:
Exhaust sample.JPG
The red trace as you know is the channel B and represents the exhaust waveform, AC coupling.
Channel A is starter motor current
KInd regards and happy scoping

Dario

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Fat Freddy
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Re: DIY First Look Senx Sensor

Post by Fat Freddy » Sun Apr 05, 2015 10:20 am

Nice one Dario.

Thought I should chuck an image up of my povo pack FLS. Total cost was about $10 or €7. It may not be pretty but is extremely sensitive.
IMG_4384.JPG
Cheers
FF

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sigoaprendiendo
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Re: DIY First Look Senx Sensor

Post by sigoaprendiendo » Sun Apr 05, 2015 12:47 pm

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 :wink: :

Not pretty faces, but do the trick :D


Here you are another waveform sample:
Clipboard02.jpg
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

Kind regards and happy scoping

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