Problems plotting ignition with MSD. Help! - Saab Performance Bulletin Board - Saabnet.com
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Problems plotting ignition with MSD. Help!
Posted by johniemi (more from johniemi) on Fri, 17 Sep 2004 23:32:17
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as anyone plotted the ignition curve that is achieved with the vacuum capsule (either a self-modded one or original vac capsule)?
I am having problems with knock now that I installed a MSD BTM6.
I used to run the original vac capsule setup, making the timing curve like this:
0 bar - 16degrees
0.3 bars up till 1.0 bar - 10degrees
It worked perfectly. Ok, It had a little sluggish behavior on off-boost & low boost but on boost the thing flied. No knock.
Now I have tried the following settings with the MSD+pressure relief valve (limits the amount of boost the MSD unit senses), and I always get knock at 1.0 bars with the MSD: http://cc.joensuu.fi/~john/MSD_chart.jpg
Also, here is a small poll for you ;) Please tell me which one of these ignition curves is closest to the optimal curve I can achieve with an MSD unit and a pressure relief valve: http://cc.joensuu.fi/~john/MSD_poll.jpg
Thanks!!
-John
posted by 83.245.1...
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