Tiny-Tach - page 2 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• #15 by fatmobile on 15 Feb, 2008 22:10
• Can you take a picture of the transducer?
   I overtightened the one on my ferret timing light and ruined it.
   The tinytach ones are cheaper than a new ferret one but they won't send me a picture of it to see if I can use it for a replacement.
• #16 by hillfolk'r on 16 Feb, 2008 12:06
• digital is a little hard to read(to me) in the heat of the moment
  i got a lil 2 inch vdo diesel tach that runs off the w terminal
  i  verified the accuracy with a diesel pulse adapter and a digital timing light/tach and adjusted it(the tach has an adjustment pot)
  
  now i got a GTECH RR and it has a shift  light
  now in the "heat of the moment" all i look for is the shiftlight on the gtech
  tach is in the middle
  
  shift light is 4 little leds on upper right side of gtech
  
• #17 by rabbitman on 16 Feb, 2008 23:28
• 
  
  
• #18 by fatmobile on 18 Feb, 2008 01:54
• Thanks for the pics.
   Pretty close to the one on my ferret 765.
   The ferret has a ground clamp that clamps to the injector line.
   Did the tinytach have a ground wire on the injector line?
• #19 by saurkraut on 18 Feb, 2008 05:00
• Quote from: "rabbitman"

  
  
  

  
  
  They sell these sepparatly for $35.
  
  Any one have ideas about running a gasser tac with this sensor?
• #20 by jimfoo on 18 Feb, 2008 06:54
• Quote from: "fatmobile"

  Thanks for the pics.
   Pretty close to the one on my ferret 765.
   The ferret has a ground clamp that clamps to the injector line.
   Did the tinytach have a ground wire on the injector line?

  
  
  Do you know what kind of signal it outputs off hand? I'm guessing a very low current but higher voltage?
• #21 by jimfoo on 18 Feb, 2008 06:56
• Quote from: saurkraut

  Quote from: "rabbitman"

  
  Any one have ideas about running a gasser tac with this sensor?

  
  I would guess there wouldn't be enough pressure for it to detect as it's close to a factor of 100 less, but you can find out for only $35. :lol:
• #22 by Vincent Waldon on 18 Feb, 2008 09:35
• It's a piezio transducer so the output will be an extremely brief pulse of several hundred (if not thousand) volts... albeit at a very very low current.
  
  It will also only give one pulse every two revolutions so will read  1/4 what a gasser tach will read.
  
  I have one on the way and will do some digging with my oscilloscope when it gets here... first priority will be to design a timing light adapter for it... but a frequency quaduplier should not be too hard ;-)
  
  EDIT: it's 1/4 of what a gasser tach will read
• #23 by rabbitman on 18 Feb, 2008 12:42
• I don't think it would work on a gasser since it senses the injection by feeling the pulse through the Injector line.
  
  There is a ground wire but it's under a valve cover nut.
• #24 by Vincent Waldon on 18 Feb, 2008 13:42
• yup... just did the math in my head... will edit the above posts for posterity !