Okay, so I have been monkeying with my MSD-BTM-6/Homemade dawes device/basic ignition timing for the past few weeks, and Am starting to get an idea of how this all works together, but I wnated to run my settings by you fellow SAABers...

1987 SPG:
Ignition timing: 8degrees (runs fine)
MSD BTM-6: anywhere from .47 to .75 on the dial
homemade bleeder (dawes) device set to about 4-5 threads showing.
I made the valve using the following website: http://www.thedodgegarage.com/ -> turbo database -> 17. Map Sensor modifications to prevent overboost shutdown


Now, the bleeder is in-line from the throttle body (tee's off from the
vac line going to the VA on the distributor) and is about 4 inches from the BTM. Should I plug it into the white vac canister on the passenger side for less wild pressure fluctuations? THe issue is that when I get up to about yellow/red line on the boost guage, the engine will start bucking and stumbling abit thus keeping boost levels right in that area, and I can only assume that it's because of
EITHER too much advance (from bleeder) or too much retard (from BTM).

I am also assuming that the optimal boost vs. ignition retard graph is a curve using a fixed or logarithmic ratio. With that assumption, I have learned that the BTM's retard curve is a straight line (1:1) graph, so I'm trying to intercept as many points between these two lines RIGHT????

NOW THEN, with all this techno-babble out of the way, am I close to the proper settings here? I have tried a red APC box and my original black APC and am getting similar, if not the same results with both.

HELP?! & Thanks in Advance for your time!
-ROb

posted by 68.142.6...

• MSD-6 BTM tuning (it's better but still need help) LONG, saabrobaz, Wed, 13 Sep 2006 14:57:12 <-- Viewing This Message
  • I think yo have a fuel or spark delivery problem, jak , Thu, 14 Sep 2006 20:32:11
    • Re: I think yo have a fuel or spark delivery problem, Simon S, Fri, 15 Sep 2006 10:06:08
      • Interesting..., saabrobaz, Wed, 20 Sep 2006 09:29:07
        • Re: Interesting..., Simon S, Thu, 21 Sep 2006 08:40:39
  • Re: MSD-6 BTM tuning (it's better but still need help), Simon S, Wed, 13 Sep 2006 15:39:48
    • Message to Simon S, Landjet , Wed, 13 Sep 2006 20:00:24
      • Normal?, Jonathan Scupin , Thu, 14 Sep 2006 13:24:06
      • Re: Message to Simon S, Simon S, Thu, 14 Sep 2006 10:54:03
        • Re: Message to Simon S, Landjet , Thu, 14 Sep 2006 15:52:43
    • MSD-6 BTM tuning (more info as requested :) ), saabrobaz, Wed, 13 Sep 2006 16:06:19
      • Re: MSD-6 BTM tuning (more info as requested :) ), Simon S, Wed, 13 Sep 2006 18:06:15
        • My BTM settings, and RPR and orifice update, saabrobaz, Thu, 14 Sep 2006 09:42:03
          • Re: My BTM settings, and RPR and orifice update, Simon S, Thu, 14 Sep 2006 10:58:06
            • Relieving pressure regulator - pipe size, saabrobaz, Thu, 14 Sep 2006 12:27:09
              • Re: Relieving pressure regulator - pipe size, Simon S, Thu, 14 Sep 2006 17:09:52
    • Re: orifice, Simon S, Wed, 13 Sep 2006 15:51:28
      • Re: orifice, lms, Fri, 15 Sep 2006 09:20:33
      • Re: orifice- didn't install, saabrobaz, Wed, 13 Sep 2006 16:11:53
        • Re: orifice- didn't install, Simon S, Wed, 13 Sep 2006 17:29:33
          • Base boost is 3/7ths into the yellow on my car..., saabrobaz, Wed, 13 Sep 2006 17:43:06
            • Re: Base boost is 3/7ths into the yellow on my car..., lms, Fri, 15 Sep 2006 09:23:15
              • true dat. nm, Simon S, Fri, 15 Sep 2006 10:06:34

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