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Tach signal w/o ECU


Gimpin
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819/2000


Galant VR-4 org Post #: 739673 posted 12/29/08 12:49 PM     Remind Me!  Send Private Message   Edit Post      
I am getting ready to set up my Autronic but the SMC model doesnt come with tach out put. Is there anyway I can wire in the tach so that I dont need the factory ECU or an MSD box of sorts?



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Posts: 557 | From: Plant City, FL | Member Since: 06/09/07 | IP: (209.135.35.83) | Report this post to a Moderator

toybreaker Galant VR4.org Moderator
it's peace of mind at 100 mph plus
1990/2000


Galant VR-4 org Post #: 739681 posted 12/29/08 01:10 PM     Remind Me!  Send Private Message   Edit Post      
Dan, I *believe* the tach and ecu share the tach signal.

(As in the ecu doesn't "make" the tach signal.)

This means you may be good to go as is...

Just hook up your new ecu/icemaker/ronco matic engine management system, leave the car harness alone and see what happens.






Caveat Wrencher If you let any magic smoke out trying this, I'm a gonna delete this post and pretend I'm still out on the road, somewhere where there's no intraweb...


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grocery_getter
Senior Crab
836/2000


Galant VR-4 org Post #: 739688 posted 12/29/08 01:29 PM     Remind Me!  Send Private Message   Edit Post      
If you are using a 91-94 coil pack and transistor package, the tach signal can be sourced from the transistor pin out. There is a pin that is labeled "tach" on it.

If you are using 90 coil pack and transistor package, the tach signal can be sourced out of the little 3 prong 1" by 1" black box attached to the coil pack bracket.



Andre
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Gimpin
Shotgun
819/2000


Galant VR-4 org Post #: 739692 posted 12/29/08 01:40 PM     Remind Me!  Send Private Message   Edit Post      
thanks ... great info guys

next question ... do you know if these cars use "smart coils"



"a penny saved is worth two in the bush"

819/2000 = 0.4095

Posts: 557 | From: Plant City, FL | Member Since: 06/09/07 | IP: (209.135.35.83) | Report this post to a Moderator

grocery_getter
Senior Crab
836/2000


Galant VR-4 org Post #: 739693 posted 12/29/08 01:42 PM     Remind Me!  Send Private Message   Edit Post   
No, these aren't smart coils, that's why we have to run a separate transistor/igniter setup on stock coil.



Andre
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