Bouncy Tach, ...I tried the fix |
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Bouncy Tach, ...I tried the fix |
yeahmag |
Apr 28 2010, 11:04 AM
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#1
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
So once I got my 2056cc built the tach could no longer keep up and just flailed around worthlessly... Especially when running an autocross. So I finally got around to trying the 2200uF trick and now it's over damped... Sigh. Maybe I'll try a different variant of capacitor and see what happens.
Anybody else have a recommended type of capacitor for the application: http://en.wikipedia.org/wiki/Types_of_capacitor |
sgetsiv |
May 10 2010, 11:48 PM
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#2
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Former 914 Owner :( Group: Members Posts: 159 Joined: 20-June 08 From: Portland, OR Member No.: 9,192 Region Association: Pacific Northwest |
If you are running carbs then...
I cured my bouncing tach by grounding the relay board in the engine bay - see the classic thread http://www.914world.com/specs/SirAndyCarbFuelPumpRelay.php Just run the wire from the driver's side front connector to ground - suggest you use black wire rather than red since it is a ground. I use the unfused +12v connection to run my fuel pump, oil cooler fan and accusump relay - with fuses of course, and red wire. I also cleaned the body ground connection next to the relay board in the engine bay. Of course, I also added a 2200 uF capacitor across the movement before solving the problem. And I got a nice clean tach glass as well. |
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