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C900 DIY AID mod was easy and works great!
Posted by Saab Junkie [Email] (more from Saab Junkie) on Tue, 27 Jan 2009 13:27:41
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I know this is old news, but I thought I would post for any C900 owners thinking about this mod. Bending the AID stop was easy, and made a huge difference. I did use a mity vac to measure at what pressure the AID hits the stop (adjusted for 12-13 PSI), and it engages smoothly. I then timed it for 11 degrees with max boost (using the mityvac again).
I also found my original AID was an "on-off" type response to boost, but a junkyard AID (actually I got two) worked smoothly starting at 5PSI and fully retarded the timing by 12-13PSI. I get zero audible knocking, but the APC obviously reduced boost (max 16, steady 14-15).
With my DIY APC tweak, I can hold 14-15 PSI steady (before it was 11-12). Pretty cheap HP for my car.
~Junkie
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