Lets talk tachs |
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Lets talk tachs |
Ductech |
Apr 19 2011, 12:58 PM
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#1
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Member Group: Members Posts: 356 Joined: 16-July 10 From: AridZona Member No.: 11,949 Region Association: Southwest Region |
I just finished up my ej22 subaru swap. after drag racing a rx7 in the boonies and self destructing my shifter, i have stopped to take a look at all the little stuffs. now my tach is a little bouncy compared to a nice new digital being fed by an obd2 car computer. As the wiring i used was the original tach signal wire, im wondering if a little bit of noise is most likely the issue or if the tachs on these were never that amazing in the first place. Thanks for the your help guys.
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whatabout1 |
Apr 19 2011, 07:46 PM
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#2
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Toys in Red Group: Members Posts: 403 Joined: 6-March 06 From: Charlotte, NC Member No.: 5,676 Region Association: None |
The tachs were always great but are now 30 + yrs old.
Has the tach been rebuild ? Palo Alto does great work. What is sending the signal to the tach ? Hook a O-scope to the tach input and see if it is a nice clean or almost clean 0 - 12v pulse. Allot of the newer ignitions will send a spike that may be to quick for these old tachs that are designed to work with points. Something like the MSD tach driver box may be needed. |
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