Tach signal and EFI, Megasquirters and Subaru converters please read... |
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Tach signal and EFI, Megasquirters and Subaru converters please read... |
falcor75 |
Jul 25 2016, 01:39 AM
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#1
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia |
I'm running my 2.0 four cylinder with an aftermarket ECU.
In the settings for the tach signal I've selected 12v, 50% duty and this worked fine for a few months of testing. The day before my dyno session the tach started behaving wierdly. It would start up fine but after a little bit of running it would settle between 3k-4k rpm. Revving the engine would momentarily get it back to normal but after a few seconds at constant rpm it would return to its new favorite position. Any ideas what could be causing this? |
falcor75 |
Jul 27 2016, 08:45 AM
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#2
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia |
Did some testing today...
First i borrowed an Autometer SportComp tach from friend and hooked that up to the ECU output cable. The autometer tach is spot on what the ECU is sending out. Popped the VDO tach from the cluster and pulled the signal wire from it, it still shows 3000 rpm! (IMG:style_emoticons/default/blink.gif) So, electronics isnt my strong suite but I'm guessing one of the internal components of the tach has failed somehow? |
Series9 |
Jul 27 2016, 12:46 PM
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#3
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Lesbians taste like chicken. Group: Members Posts: 5,444 Joined: 22-August 04 From: DeLand, FL Member No.: 2,602 Region Association: South East States |
Did some testing today... First i borrowed an Autometer SportComp tach from friend and hooked that up to the ECU output cable. The autometer tach is spot on what the ECU is sending out. Popped the VDO tach from the cluster and pulled the signal wire from it, it still shows 3000 rpm! (IMG:style_emoticons/default/blink.gif) So, electronics isnt my strong suite but I'm guessing one of the internal components of the tach has failed somehow? Like I said, you can throw an Autometer tach in there and gain perfect (not bouncy) function plus a shift light if you like. A /4 VDO tach is nothing special, except that it looks like it goes there. |
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