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

[JShadzi at aol.com]

> Hi Javad!
>
> Meaning they both have some form of vacuum advance, but they are different from each other?  Or, one of them has vacuum advance and the other one doesn't.  If I were to guess (here I go), I would say the 4kq has the vacuum advance, since I recall my past Coupe GT's as having that little shift light that is affected by a functional vacuum advance.
>

Yes, the NG does not have vacuum advance, this is compensated for in the ingition control unit's maps.

> Where do I tap into the hall signal?

The middle wire in the hall connector.

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

The hall signal is only an electrical pulse when one of the windows pass.

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

Only for TDC if your system is valve-timed sequential.  If it is not, then you can easily pull your RPM signal from the 5 window hall, that is what I do on the 034 systems.  If it is, then all you need is another signal that pulses for TDC which can be done off the flywheel, cam gear, crank pulley.  You could use one of the existing hall sensors for the TDC signal.

> I was thinking this morning that if I have a choice between using components from the MC-1/MAC11 ignition system, or parts from the 4kq ignition, I would prefer to use the 4kq.  That way I can retain a more complete wiring harness for the MC-1.  The idea would be to maybe use those extra parts for some kind of low-to-midrange turbo conversion on a cheap Coupe GT if I ever come across one that's cheap.
>
> I suppose since I would be using the distributor, hold it...  I just had a thought.  So, if I use the 4kq hall sensor, does that mean I'm using the distributor from the 4kq in the MC-1 long block?  I suppose it does mean that.  Are there any special considerations for doing this?
>

No, any of the 10v dist. fit any of the 10v heads..

> Someday in the future, I have the option of going with direct ignition with 5 coils.  At that point, I don't need to use the distributor for distributing spark.  But I guess I still have to have one physically in the head to provide for the hall signal, if that's where that stuff is.
>

Unless you move your hall sender to the cam gear...

> I think I may have to provide them the length of the flywheel teeth and gaps.

No you don't, see above...

Javad