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Tach hookup for Stratus/Subaru

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steerr(at)bellsouth.net
Guest

Posted: Wed May 13, 2009 6:44 am Post subject: Tach hookup for Stratus/Subaru

Hello all.  I recall somebody posting a note here some time ago about 

how they hooked up their tach for the standard FWF kit from Zenith.  

Larry has kindly sent me the drawing of his system, but he's using the 

TP-45 modules and I'm not (yet).  If anybody has used the standard tach 

and the unmodified engine ignition from Stratus, can you please let me 

know where your tach signal leads are connected?  Also, did you make 

your connections using the hand-written sketch Zenith supplies in their 

FWF documentation?



Thanks very much.



Bill

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tshankland(at)sbcglobal.n
Guest

Posted: Thu May 14, 2009 8:02 am Post subject: Tach hookup for Stratus/Subaru

Bill,

I used a standard VDO tach on my Stratus engine. The tach lead goes to 

the ground side of the ignition coil. I did have some problems with an 

unstable reading at around 3000 RPMs. I tracked it down to a short (2 

msec) pulse that sometimes came from the system. I used the attached 

circuit to tame the problem. Been flying over a year with a steady 

reading tach.

Tim Shankland



Bill Steer wrote:



 	  Quote: 	
		   



 Hello all.  I recall somebody posting a note here some time ago about 

 how they hooked up their tach for the standard FWF kit from Zenith.  

 Larry has kindly sent me the drawing of his system, but he's using the 

 TP-45 modules and I'm not (yet).  If anybody has used the standard 

 tach and the unmodified engine ignition from Stratus, can you please 

 let me know where your tach signal leads are connected?  Also, did you 

 make your connections using the hand-written sketch Zenith supplies in 

 their FWF documentation?



 Thanks very much.



 Bill

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sat May 16, 2009 7:20 am Post subject: Tach hookup for Stratus/Subaru

I have the original Stratus ignition system with the second backup  

system and a VDO tach from Zenith. I bought two small signal diodes  

from radio shack and hooked the tach into the negative wire from  

ignition module to the coil on each system through a diode. The diodes  

isolate the two ignition systems from each other but allow the signal  

from either to get out to the tach. My system is set up so that only  

one system will run at any time.



Here's a drawing of what I did. When I first hooked the system up, I  

had the diodes in the wrong way and had to reverse them. I think I  

corrected this drawing to reflect that.

On May 13, 2009, at 10:38 AM, Bill Steer wrote:



 	  Quote: 	
		   



 Hello all.  I recall somebody posting a note here some time ago  

 about how they hooked up their tach for the standard FWF kit from  

 Zenith.  Larry has kindly sent me the drawing of his system, but  

 he's using the TP-45 modules and I'm not (yet).  If anybody has used  

 the standard tach and the unmodified engine ignition from Stratus,  

 can you please let me know where your tach signal leads are  

 connected?  Also, did you make your connections using the hand- 

 written sketch Zenith supplies in their FWF documentation?



 Thanks very much.


	




-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

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