just installed celica c.o.p's and now no tach - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-19-2011, 02:49 AM   #1
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Default just installed celica c.o.p's and now no tach

i just finished installing celica cops in my BP+T MS1 v3.0 festiva and now my tach doesnt work. i wired it as per Lazzer408's diagram. its not a waste spark tach so i made a module as per a ms1 in a 323 gtx :

Name:  tachmod.jpg
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ive tried wiring it to the ms output to the coils the tach output terminals and the (1+4) wire and the (2+3) wire and neither way worked.


any thoughts?
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Old 05-19-2011, 05:12 AM   #2
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Last edited by fastivab6tg25mr; 05-21-2011 at 05:57 AM. Reason: better pic
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Old 05-19-2011, 06:12 AM   #3
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you need a zener diode in that diagram to make it work, like this:



1N5355B or a 1N5555B will work and are available at radioshack.
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Old 05-19-2011, 08:28 AM   #4
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i bet you just need to give the tach output wire a 1K pullup from 12v.
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Old 05-19-2011, 03:21 PM   #5
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Quote:
Originally Posted by Braineack View Post
i bet you just need to give the tach output wire a 1K pullup from 12v.
that works too
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Old 05-19-2011, 04:55 PM   #6
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How about making me a snazzy COP hold down clamp.
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Old 05-19-2011, 05:10 PM   #7
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Quote:
Originally Posted by djp0623 View Post
How about making me a snazzy COP hold down clamp.

sure... ill charge way more money than its worth though... took me like 4 hours to make that damn thing...

ill try the the 1k ohm resister and see if it works. does it matter how many watts it is?

thanks for the replies
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Old 05-19-2011, 05:44 PM   #8
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1/4watt works
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Old 05-20-2011, 01:38 AM   #9
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the 1k ohm pull up didnt work... ill pick up a diode tomorrow and see if that fixes it
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Old 05-20-2011, 01:44 AM   #10
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make sure its a ziener and make sure you put it with the stripe facing the over diodes like in the picture:



http://www.msextra.com/doc/ms1extra/...ev_Hivolts.GIF
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Old 05-20-2011, 02:21 AM   #11
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could it have burned up my tach circuits running it without that extra diode?
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Old 05-20-2011, 02:39 AM   #12
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no, unless they look damaged id try the ziener before 2nd guessing anything else
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Old 05-20-2011, 07:21 AM   #13
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k...i didnt disconnect the tach circuits at first and i dont think they hurt the coils but it did cause a spark break up issue above 10psi... removed the wires and it revved smoothly to 14psi.

should i remove the 100k ohm resistors from around my diodes?

edit: what spark plugs should i use?

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Old 05-20-2011, 07:54 PM   #14
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the diode thing didnt work at all... i tried both with and without the pull up and neither one makes the tach move at all. here is my crude little tester i made. i soldiered all the connections together and to the corresponding wires on the car.

Name:  tachcomponents.jpg
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Old 05-20-2011, 08:29 PM   #15
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that looks nothing like the zeiner diode i used..

and with the zeiner you do not need the pull up resistor
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Old 05-20-2011, 10:58 PM   #16
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do you hve cops on your 323? caue it worked fine on my miata coil packs hooked up to the coil driver wires coming out of the igniter
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Old 05-20-2011, 11:27 PM   #17
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I had KLg4 coils on my 323 on the KL and used the same diagram as post earlier by me.

the ziener diode i used from RS was this:

http://www.radioshack.com/product/in...uctId=2049725#
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Old 05-21-2011, 05:54 AM   #18
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does the one in that link replace the 1n4004 or the 1n5355B?
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Old 05-21-2011, 11:02 AM   #19
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the 1n5355B is a ziener..

on your diagram it appears you attached the 1n4004s to the tach input? should be the spark outputs from the MS.
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Old 05-21-2011, 04:00 PM   #20
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oh... i put them on the tach output terminals of the coils
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