Saab APC + turbo I5 ?s

[Jim Green]

--- Marc Swanson <mswanson at sonitrol.net> wrote:
> I was looking at using an APC box as a way to
> implement a knock light on
> my 4ktq.  Jim, I know you've done this but in
> looking at the specs for
> the system i was curious if anyone has tried hooking
> up the boost
> control portion of the system to an I5?  Obviously
> the tach input would
> be wrong but the worst that would happen would be
> for it to limit boost
> too much.  I was just curious if someone had hooked
> it up what the boost
> behavior was like...
>
> I've also read that the boost limits can be adjusted
> by a couple of
> trimpots on the circuit board so it could be
> tweakable....

I was just looking into this the other day, the only
percievable problem is that it works the opposite of
the Audi WGFV.  It's designed for internal wastegate
turbos, so it adds pressure to reduce boost vs. adding
pressure to add boost like on our cars.  You should be
able to hook the Saab frequency valve to the lower
wastegate hose to have the same effect, You probably
will have to have the stock wg spring in place.  I'm
not too worried about hooking it up, I can just make a
quick adjustment with either the trim knob or the
laptop if I'm getting knock:)  I am curiouse to see if
it would work though.

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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