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 |
Dr Evil |
Apr 28 2010, 11:24 AM
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#2
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Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Where did you get the info on the capacitor? I thought that the capacitor changed the RPM factor (like changing it from reading a 4 cyl to an 6 or 8 cyl). A large electrolytic one is not necessary. You can get a small capacitor at Radio Shack for a few cents and that should do it. The capacitor is basically acting as a clip on the RPM wave form. Like turning down the volume. Right now you are turning the volume down too far so a lower farad cap would give you a smaller time constant thus allowing more of the RPM signal through. You can see where changing the cap could dope the signal enough to stall it and make the needle rise slowly enough to match the RPM of a 6 or 8cyl.
I would think that gutting a universal tach and putting the guts into your case with your face and needle would be a more cost effective and time wise endeavor. |
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