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Alternate approach
Posted by Notnoel [Email] (#23) [Profile/Gallery] (more from Notnoel) on Thu, 2 Nov 2017 06:57:36

In Reply to: Modified retard capsule., Acejed, Wed, 1 Nov 2017 15:53:24
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This worked very well> I placed a small, linear spring on the little arm that extends from the capsule so that you do not have to cut open the capsule (got the idea from a hand-held fishing scale I once owned). I also removed and ground down the stop into a cam to make setting the max retard position adjustable. The link below will take you to the thread on how I did it.

I sent a picture to Jak who put it in his photo gallery (and it seems to still be there). Please note that there are two little springs in parallel there. You will need to experiment with how many coils you need in order to get the retard rate to where you want it (a smooth nearly linear retard to about 9-10 degrees at 1 bar of boost is where I set mine). Once you get it set up, place a small dab of epoxy at either end of the where the springs attach to the body and to the lever to keep them in place.

Also, note which side of the lever the springs are on. I first tried putting the springs on either side of the lever arm, but one side interfered with the casing, so I had to move both over to one side. Also, after about 4-5 years, I noticed my performance drop off suddenly. When I examined the capsule, I found that the springs had broken. They weren't meant to be opened and closed thousands of times, and the process of cutting and bending them to the task likely weakened them as well. It only took me about an hour to fix (and for a $0 performance mod, I wasn't really too broken up about it). This is one of the most satisfying improvements to performance that I've done.

I now have a Group9 AID on my car, largely because a NOS one came up on FleaBay. But honestly, I think mine worked just as well and I put on the Group9 unit because it looked cool, was part of Saab 900 history, and I would have never figured out to do this in the first place if there hadn't been such a through discussion of what the AID would do and how it worked. I probably would have gone with the MSD electronic solution to this problem instead (at considerably higher cost).

Home-made DIY

->Posting last edited on Thu, 2 Nov 2017 07:12:24.
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