Saab APC fitted to Audi?

[Ken]

Hi Folks,

I know little about the Saab APC computer, but it seems to be a knock sensing boost controller that has been fitted to various non-Saab turbo cars.  There are modified boxes as well that do different things, apparently.  I think the stock boxes have a boost map with a taper(?).

It can be run with the pressure transducer up to like 15psi(?), above which it can be setup to rely only on the knock sensor.  Possibly a bleeder valve can be used while retaining the pressure transducer.

Anyhow, I was wondering what experience is here with one of these?

I was thinking that since the SchrapnelKnobben mod eliminates ecu-controlled boost, that adding one of these boxes between the regulator and the upper WG chamber (or however it would be fitted), would be able to have some degree of protection against knocking (more than no boost-related control?).

Perhaps this is redundant, since the ecu is still in control of ignition timing and has a knock sensor?

Here are some posts I found in the archives and on the 'net on the matter:

83 Turbo Quattro Coupe (comma more power):
http://www.audifans.com/archives/1993/06/msg00004.html

Jim's ignition problem:
http://www.audifans.com/pipermail/quattro/20020426/053209.html

New plug wires = knocking?!:
http://www.audifans.com/pipermail/quattro/20010923/034440.html

Re: Callaway Turbo Kit:
http://www.audifans.com/archives/1998/02/msg00232.html

Re: 1985 4000s knock sensor question:
http://www.audifans.com/archives/1995/02/msg00923.html

Saab APC System On B21FT (Volvo):
http://www.geocities.com/MotorCity/Garage/6776/apc.html

APC Theory by Kevin Kelleher:
http://www.dave-new.com/apc/kevinapc.html

Thanks,

Ken