tachometer signal revisted

[Jim Green]

--- Richard Hoffman <billzcat1 at hotmail.com> wrote:
> 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?


Richard, I think you're on the right track with the
jumper/switch settings on the back of the tach.  But
one more thing on the 034EFI, the stage IIc is
wonderfull.  One thing kinda related ot this is the
use of our loved Saab APC knock lights with a DIS
system.  The APC needs and traditional coil trigger
signal like you would have for a distributer.  With
DIS you have 5 seperate ones.  Doesn't work to well:( 
Then I figured, hmm I have a few extra ign. outputs
available, right?  Luckily the software let me program
a seperate ign. output to fire every event, so it's
just like there's a regular coil there with a
distributer.  Good stuff.  I think Javad has some
screen shots on his website.

Later,

=====
Jim Green
'89 80q slow
'89 90tq fast, really fast
http://www.mswanson.com/~jgreen/car_home.html

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