tachometer signal

[Richard Hoffman]

I am using Tec3 which has tach outputs for 1-6 pulses per revolution.  It
doesn't allow me to use 2.5 pulses per rev.  I suppose I can swap a
4-cylinder typ89 tach and use 2 pulses per rev and that would solve all my
problems.
Richard
90 CQ
70 100LS
----- Original Message ----- 
From: "Jim Green" <jeg1976 at yahoo.com>
To: "Richard Hoffman" <billzcat1 at hotmail.com>
Cc: "Quattro list" <quattro at audifans.com>
Sent: Monday, December 01, 2003 2:01 PM
Subject: Re: tachometer signal


>
> --- Richard Hoffman <billzcat1 at hotmail.com> wrote:
> > This isn't going to work for me as I have no
> > distributor to take advantage
> > of.
>
> Um, what what are you doing again?
>
> > So to be clear: the typ89 5-cyl tachometer uses a
> > square wave, 2.5 pulses
> > per revolution?
>
> Correct
>
> > Or does it take an independant
> > signal from the ECU?  What's
> > going on here?  I don't have an occiliscope to check
> > this stuff out :)
>
> Nope, I've feed it from the dist, from a Haltech, I
> think some of the Crane and Msd ign boxes have tach
> outputs that would work, the 034 efi tack output works
> great, and could be configured to make the tach think
> there's 5 cyl there instead of 8 cyl if you did a v8
> swap. You really just need the 5 pulses per engine
> cycle to make it work right.  If you're not running a
> 5cyl, and you were previously, that could be tricky
> with some management systems.  Who knows, there may be
> some jumpers on the tach or something that might help,
> I've never looked.
>
> =====
> Jim Green
> '89 80q slow
> '89 90tq fast, really fast
> http://www.mswanson.com/~jgreen/car_home.html
>
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