Re: APC - Saab Saab Model 99 Bulletin Board - Saabnet.com
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Saab Model 99 Bulletin Board
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Re: APC
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Posted by Richard Cooper (more from Richard Cooper) on Thu, 19 Aug 2004 10:44:08 Share Post by Email
In Reply to: APC, Rowan Atalla, Wed, 18 Aug 2004 15:22:11
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You rang? :)

Yup, All installed ont eh original B engine block. It took me ages to find somewhere to mount he knock sensor - which if you have a alter engine isn't pa oroblem at all as you'll already have a boss machined and the threaded hole to fix it. The rest was basic plumbing and wiring. Straight away it's picked up knock and reduced to boost to suit. I'm thinking I have a fuel pressure problem which I'm working on now. Some pictures:

http://www.nutcase.pwp.blueyonder.co.uk/APC_knock.jpg
http://www.nutcase.pwp.blueyonder.co.uk/APC_solenoid.jpg
http://www.nutcase.pwp.blueyonder.co.uk/APC_transducer.jpg
http://www.nutcase.pwp.blueyonder.co.uk/apc_wired.jpg

The car has lost some of the "thrown back in your seat" feel of the 99T, but I think I can restore some of that by tweaking the rise rate pot in the APC. I've also had to change teh overboost fuel cuttout as it doesn't appear to be adjustable, and I kept hitting it :( A bit of tweaking of the wastegate helped there, but when it is running well, it just wants to keep boosting, sitting solid on 0.9bar all the way up to redline in fourth. I love it!

I'm with Geoph on installing the whole thing rather than just the knock sensing portion. However, you may find you have to reduce the APC's original max boost setting as with the high CR pistons, you won't be able to boost as much as a true turbo engine. Well, you might on full blown racing fuel!

I found the various bits for the APC system really cheap (I got most of them for helping someone part out they're spares car. It cost me $8 for the APC controller as well (patience is a virtue - as well as being a good haggler!). Total cost for me was in the region of $50 including a couple of genine saab bushes to fit the pipe, and silicone vacuum tubing of the right bore. Even the LED I used for the knock sensor output was from a T16 alarm :)

Feel free to ask any questions or if you want more pictures etc.

posted by 82.34.51...

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