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 25 2016, 07:18 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 |
Yeah I want to use the orginal tach. Anyone know if a signal amplifier that works? I googled some homebuilt stuff but I'd rather buy something off the shelf.
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JamesM |
Jul 26 2016, 12:27 AM
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#3
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Senior Member Group: Members Posts: 1,900 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
Yeah I want to use the orginal tach. Anyone know if a signal amplifier that works? I googled some homebuilt stuff but I'd rather buy something off the shelf. You can modify the stock tach to work without a signal amp. I do not recall the specifics off the top of my head but the info is out there if you search for it, its a very simple mod. I did that and the mod to eliminate the tach bounce about 10 years ago and its been fine triggering off my Megasquirt+MSD setup ever since. |
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