Re: APC upgrade for 1988 Convert - Saab 900 Bulletin Board - Saabnet.com
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Re: APC upgrade for 1988 Convert
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Posted by JohnK (more from JohnK) on Mon, 22 Mar 2004 12:10:37 Share Post by Email
In Reply to: APC upgrade for 1988 Convert, RJB44, Mon, 22 Mar 2004 09:43:47
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SPG9 sells a box, but I would first try tweaking yourself. Very easy to get close to what they do without soldering. A 10 year old could do this.

It's not brain surgery, just a brain adjustment.

All you have to do is unscrew the box mounting bracket from the fender and unplub the APC computer. Then unscrew the box halves and pull the cover off. You will see a printed circuit board and be able to locate 3 holes in the board. In these holes, you will see potentiometers(variable resistors) with screw slots. One is labeled P, one F and one K. Leave the k pot alone so you retain knock sensor protection.

With a small screwdriver, turn the F pot clockwise about 90 degrees(1/4 turn). Then by trial and error bump the P pot clockwise, say 10 degrees at a time. Take the car for a test drive after each adjustment and see how it goes. This whole process only takes about 10 minutes.

The f pot controls max boost and the p pot controls boost rise and sort of a default boost setting. Anyway, if you turn up the P pot too much, you will get boost overrun. So you turn up the P pot just enough to get a rapid and smooth boost build to the max setting and not much beyond. If you get too much knock sensor intrusion at max boost, you can cut f and p back a bit.

Before you do this, you should set your base boost to 5-6psi. Will make a world of difference, if it hasn't been done in awhile.

posted by 208.208.152...

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