tachometer signal revisted

[JShadzi at aol.com]

Nah, no big secret, basically most of the Audi (and most other tachs) want to 
see a stepped 0-12v signal, once for each spark event, so in an I5, it would 
be 5 times per every 2 crank revolution.  I believe that if you set your TEC 3 
for 5 pulses per cam revolution, you'd be fine, but it may not be configured 
that way.  Of course, 034efi could easily be configured to solve your problem, 
but that probably doesn't help ;)

I guess you'll have to experiment with it, I wonder what the guy in Santa 
Barbara did with his Electromotive run V8 conversion?

Javad

In a message dated 12/1/2003 6:13:46 PM Pacific Standard Time, 
billzcat1 at hotmail.com writes:
Upon further research, the 4-cyl (3A) and 5-cyl (NG) use the same
tachometer. According to  Jim Green, this tach only responds correctly to
5-pulses per cycle.  Does the 4-cyl ECU really put out 5 pulses per engine
cycle?  Javad, I hope this isn't giving away technical secrets of the 034EFI
ecu, but what is the tach signal output like?
Thanks!
Richard