hall sensor on a '85 4kq? (5 window type?)

[JShadzi at aol.com]

> So, if I don't want my hall signal to advance under vacuum, I should
> disconnect the advance (see question below, regarding the effect of vacuum
> advance on hall signal)?
>

Yes, or be done with it and use the NG/NF dist.  With programmable ignition you don't want vacuum advance.

> > > Does the hall signal itself change with the vacuum advance, or is the
> > > hall signal constant?

> I meant, is the timing of the hall signal affected by the vacuum
> advance, or is it just the spark that's affected?  Here I am probably
> really showing my ignorance.  I will physicaly look at my distributors
> when I get home to see what I'm asking about.
>

Mute since you won't be using it, right?

> > > I think I would still have to incorporate the timing reference pin in
> > > the flywheel for my system to function correctly.
> >

Ok, last time, use your dist hall for RPM info, and use a pin in the crank/cam/flywheel for a TDC signal..

> I can't tell if you mean I don't need the specs on the teeth
> regardless of whether or not I am using them for rpm (I can use the
> teeth for rpm but don't need the specs),
> or if I only don't need the specs becasue I can use something
> besides the teeth for rpm, like a cam mounted hall sensor (custom
> on the gear, or a stock 5 window).
>
> I hope that question was clear enough.
>

The Mac11 uses the flywheel teeth for RPM info, which you can get from the dist hall, that's why you don't need the flywheel info...

Javad