In Reply to: the turbo can only....., jak [Profile/Gallery] , Thu, 26 Sep 2002 00:13:20

Don't know whether the mods you're planning to the APC eliminate the active duty cycle where it takes control of boost. If not, this may be helpful:

Beaudreau, Kevin K and others posted suggestions that using a Dawes Device style manual boost controller (MBC) in-line between turbo and boost control valve can "hide" boost from the APC until it reaches a minimum threshold. MBC should be set to open at a pressure well below any possible knock but higher than the 4 or 5 lbs where APC otherwise will begin to allow some boost to escape (thus avoiding boost spikes which are upsettling and potentially hazardous to unprepared or inattentive drivers). Knock control remains active once the boost pushes past the ball and spring valve and APC wakes up.

This worked EXTREMELY well for me. I set pressure at 8 lbs. Results: MUCH faster initial boost rise. By the time the APC "sees" the boost and switches to active duty cycle, she's already starting to fly.

Mods are listed below. The MBC was the last added engine mod and seemed to bring everything to life.

Good luck.

Jim Watts
The Stealthbomber: 87 SPG, Modestly Modified
(Open K&N, 24 lb injectors, 3.0 bar FPR, sport exhaust,
rewired APC, SPG9 AID, MBC in-line between turbo and
BCV, recently rebuilt motor and tranny with upgraded
pinion, solid SD motor mounts, braided s/s brake lines.)

posted by 209.46.11...

• Hey Marko , Jak.... APC Question Last one, Mohammad, Wed, 25 Sep 2002 21:54:38
  • Re: Hey Marko , Jak.... APC Question Last one, Marko A, Wed, 25 Sep 2002 22:46:32
    • Well with my mods will the spool up change???, Mohammad, Wed, 25 Sep 2002 23:30:28
      • lowering comp will increase......., jak , Thu, 26 Sep 2002 14:05:15
      • the turbo can only....., jak , Thu, 26 Sep 2002 00:13:20
        • Well can a 85 box work with the 2.4 system???, Mohammad, Thu, 26 Sep 2002 15:22:15
          • I think you can ........., jak , Thu, 26 Sep 2002 17:59:14
            • mohammad, jak , Thu, 26 Sep 2002 18:26:14
        • What about MBC between turbo & BCV?, Stealthbomber, Thu, 26 Sep 2002 10:34:51 <-- Viewing This Message
          • Ive not tried the MBC which......., jak , Thu, 26 Sep 2002 13:58:45
            • check prior posts, Stealthbomber, Thu, 26 Sep 2002 16:33:06
              • Re: check prior posts, jak , Thu, 26 Sep 2002 18:05:34
                • Re: check prior posts, Kevin K , Thu, 26 Sep 2002 23:11:41
                  • hey kevin......, jak , Fri, 27 Sep 2002 07:20:34
                • still disagree, but such is life, Stealthbomber, Thu, 26 Sep 2002 21:32:35
                  • OK OK Ill make one & try it, jak , Fri, 27 Sep 2002 07:13:48
                    • Re: OK OK Ill make one & try it, Zac, Thu, 26 Aug 2004 23:47:38

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