Megasquirt and CIS III

Jim Green jeg1976 at yahoo.com
Wed Jun 11 07:57:45 EDT 2003


--- Alan Pritchard <apritchard at seaeye.com> wrote:
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> Hi all, my suspension is on its way to being sorted,
> so now im looking at
> the next mod. I am considering megasquirt efi as it
> is affordable and good
> enough for what I want, sure I'd like sequential
> injection, but can't
> warrant the price. Anyway im considering megasquirt
> for when I get a turbo
> motor sorted.  In the meantime I'd like to get it
> installed on my 90q, I
> have been considering a 10v t manifold with a vr6
> throttle body, as that
> will ease the routing for cold air. I will have to
> weld injector inserts to
> the manifold, but that's no real biggy. The vr6
> throttle body should have
> the throttle position pot that megasquirt needs.

Yea, so I take it your bolting this onto your stock
motor?

> But what can be done to
> replace the pot on the airflow metre for my ignition
> system?  Would it be

Nothing, once it's gone, the ignition will never be
the same.  You can use a MAP sensor to kind of emulate
the signal, even the one in the MS may work, but the
ignition will never be as stable.  If you are seriouse
about doing this, install a MAC-11 from a 5ktq, and be
done with it.

> possible to use the same pot on the throttle body
> and 'adjust' the values to
> something that the ignition computer is expecting?

No, the signal is just not close enough to the
original, which makes CIS-III very unhappy.  You could
go a step back and use a vaccum advance systme from a
4kq, and then use some kind of boost retard module on
it.  The easiest would be to get the distributer,
trigger an MSD ign box or similar with it, then dial
in the boost retard and your done, no ECU's to mess
with.

=====
Jim Green
'89 90tq
http://www.geocities.com/jeg1976/car_home.html

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