[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Rationale not applicable to DI equipped saabs Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by SLAAB [Email] (#1275) [Profile/Gallery] (more from SLAAB) on Sat, 31 Jul 2004 20:15:33 In Reply to: Why a properly setup MBC is better than APC, Henry, Sat, 31 Jul 2004 19:01:24 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

T5 and later Trionic systems do NOT utilize a separate sonic knock sensor as indicated by Henry.

The Saab Trionic system analyzes the combustion process by using the spark plugs for measuring ionization within the cylinders. A weak voltage is applied across the gap of every spark plug after each combustion stroke. The current flowing back to the control unit is dependent on the number of ions that have been formed, which provides a measure of the combustion in each cylinder. Ionization measurement reveals whether the fuel/air mixture has ignited and burned correctly. Knock or detonation results in anomalous ionization readings. This method is extremely sensitive to the characteristics of the installed spark plug and has nothing to do with the way your car sounds. For this reason, only NGK BCPR6ES(-II) or BCPR7ES(-II) plugs can be used in these cars and must be gapped to spec.

MBC allows faster boost response and will override boost limiter in 1st and 2nd gears. MBC does NOT have the APC capabilities of adjusting boost in response to bad gas and temperature.

An MBC alone will not allow you to increase ultimate boost limits much beyond stock settings. Too high and the ECU fuel map will hit cut off. To allow higher boost, you need a modified ECU with a fuel map supporting high boost or modified MAP sensor.

Ideally, stacking SMBC and modded ECU delivers the best performance.

posted by 24.170.136...

• Why a properly setup MBC is better than APC, Henry, Sat, 31 Jul 2004 19:01:24
  • FOLKS BE SPECIFIC ON MODELS YOU ARE COMMENTING ON., SLAAB , Mon, 2 Aug 2004 12:03:18
  • translation ..., Kevin K , Sun, 1 Aug 2004 20:34:27
    • ah I see, DI/APC and base boost problem, steveC, Sun, 1 Aug 2004 22:44:07
      • Re: ah I see, DI/APC and base boost problem, Henry, Mon, 2 Aug 2004 16:21:05
  • Re: Why a properly setup MBC is better than APC, steveC, Sun, 1 Aug 2004 12:22:07
    • Re: Why a properly setup MBC is better than APC, Henry, Sun, 1 Aug 2004 16:48:48
      • Bah!, Simon S, Sun, 1 Aug 2004 20:34:27
      • Re: Why a properly setup MBC is better than APC, steveC, Sun, 1 Aug 2004 17:58:00
        • Re: Why a properly setup MBC is better than APC, Henry, Sun, 1 Aug 2004 18:30:26
      • Ive seen on several ocaisions, jak , Sun, 1 Aug 2004 17:04:37
        • Re: Ive seen on several ocaisions, steveC, Sun, 1 Aug 2004 18:02:40
          • Re: Ive seen on several ocaisions, Henry, Sun, 1 Aug 2004 18:52:31
            • I put about 240HP to the ground & run an APC, jak , Sun, 1 Aug 2004 19:10:06
              • mandrel bent 3 inch exhaust pic, jak , Sun, 1 Aug 2004 19:17:14
          • Id recap & conclude by saying...., jak , Sun, 1 Aug 2004 18:19:32
  • Keep repeating this untill even you believe it :-), Andrew , Sun, 1 Aug 2004 06:24:22
    • I agree with Henry..., Andy E, Sun, 1 Aug 2004 10:54:31
      • the deal is in my opinion....., jak , Sun, 1 Aug 2004 16:23:40
        • engine louder question, steveC, Sun, 1 Aug 2004 18:05:30
          • Re: engine louder question, jak , Sun, 1 Aug 2004 18:25:22
            • Re: engine louder question, steve, Sun, 1 Aug 2004 20:30:47
  • Rationale not applicable to DI equipped saabs, SLAAB , Sat, 31 Jul 2004 20:15:33 <-- Viewing This Message
    • I'll go along with the stacking bit..., StanleyB, Mon, 2 Aug 2004 06:08:27

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