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

[Orin Eman]

> I'm still researching the ignition timing reference pin location for my
> engine management system conversion.  I supposed I've
> determined that the pin is located 62 degrees BTDC for cylinder
> number 1 (?).

Correct, 63 BTDC on cyl 1.  135 teeth on the flywheel.

> Now I'm wondering how the stock 4kq hall sensor works.  I know
> the hot ticket for some EFI conversions are to use the NF/NG
> ignition system, which has a 5 window hall sensor.  Is this is the
> case with the 4kq as well?

Yes, 5 windows for 4kq.

> I remember the NF/NG system is preferred over the 4kq system,
> but that's because of the knock sensor.  My engine management
> system will have one or two knock sensors of it's own, so that's not
> important to me.  However, if it is a 5 window hall sensor as well,
> then I may be all set.  Anyone know?

A good knock control system will need to determine the compression
stroke on cyl 1.  Better make sure you can do that with the 5 window sensor
along with the timing pin.  You need to know what cyl is firing to determine
which sensor to listen to, as well as what scaling to apply to
the knock signal.

Orin.