fastivab6tg25mr

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 :



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?

fastivab6tg25mr

MD323

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.

Braineack

iTrader: (62)

i bet you just need to give the tach output wire a 1K pullup from 12v.

MD323

that works too

miatauser884

iTrader: (11)

How about making me a snazzy COP hold down clamp.

fastivab6tg25mr

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

Braineack

iTrader: (62)

1/4watt works

fastivab6tg25mr

the 1k ohm pull up didnt work... ill pick up a diode tomorrow and see if that fixes it

MD323

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

fastivab6tg25mr

could it have burned up my tach circuits running it without that extra diode?

MD323

no, unless they look damaged id try the ziener before 2nd guessing anything else

fastivab6tg25mr

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?

fastivab6tg25mr

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.

MD323

that looks nothing like the zeiner diode i used..

and with the zeiner you do not need the pull up resistor

fastivab6tg25mr

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

MD323

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#

fastivab6tg25mr

does the one in that link replace the 1n4004 or the 1n5355B?

Braineack

iTrader: (62)

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.

fastivab6tg25mr

oh... i put them on the tach output terminals of the coils