BPV stands for the By-Pass Valve, or "hooter" valve, or "dump" valve or "diverter" valve, or "atmospheric" valve. Although these terms are supposedly synonymous and are used on this board to refer to the same component (medium-sized cylinder-looking thing that is in the upstream aluminum intake pipe coming out of the intercooler, with a small vacuum hose going into it), they actually are two different types of valves that are used. The type used on Saabs divert the extra/unused cooled boost into the air cleaner box, whereas other vehicles use an atmospheric type which just opens up and dumps the boost out of itself. The oem Saab style do make some noise (more of a whistle), but nowhere near what a dump/atmospheric style makes (like a hooting owl).

BPC stands for Boost Pressure Control, which is the *very* expensive piece of black plastic that is mounted on top of the radiator shroud and has 3 hoses coming out of it with an electrical connector at the bottom. This component is how the ECU "talks" to the turbocharger, allowing the wastegate to open up and let all exhaust pass by the turbo and into the downpipe.

Hope this helps!

Joe

posted by 12.111.48...

• Another observation w/continuing low-boost saga..., Joe98, Wed, 12 Nov 2003 08:45:29
  • Something else..., Joe98, Fri, 14 Nov 2003 07:05:03
    • Another idea on Oxygen sensor, Bill Homer , Fri, 14 Nov 2003 09:23:24
      • Re: Another idea on Oxygen sensor, Joe98, Fri, 14 Nov 2003 09:44:39
  • Dumb question but..., David Ingram, Thu, 13 Nov 2003 13:26:29
    • Not a dumb question at all, David..., Joe98, Thu, 13 Nov 2003 14:12:20
      • Maybe it still is a dumb(er) question..., David Ingram, Fri, 14 Nov 2003 05:46:14
        • Here's your clarification:..., Joe98, Fri, 14 Nov 2003 06:31:07 <-- Viewing This Message
  • Don't know who has been following my many posts..., Joe98, Thu, 13 Nov 2003 07:58:06
  • Two points on similar issue with my 98, John Adams, Wed, 12 Nov 2003 20:41:46
  • Re: Another observation w/continuing low-boost saga..., mike9k, Wed, 12 Nov 2003 12:53:55
  • have you checked for air leaks..., Chuck, Wed, 12 Nov 2003 12:42:41
    • Good Idea! We have just about run out of other..., TonyJ , Wed, 12 Nov 2003 20:32:22
  • Re: Another observation w/continuing low-boost saga..., Kappy, Wed, 12 Nov 2003 08:51:28
    • O2 sensor is a "new" new one..., Joe98, Wed, 12 Nov 2003 09:11:11
      • Re: O2 sensor is a "new" new one..., Kappy, Wed, 12 Nov 2003 09:21:03
        • More..., Joe98, Wed, 12 Nov 2003 09:42:11
          • Manifold Absolute Pressure (MAP) sensor ..., Bill Homer , Wed, 12 Nov 2003 09:58:36
            • Re: Manifold Absolute Pressure (MAP) sensor ..., Dan Y, Fri, 14 Nov 2003 06:10:55
          • That's not an AMM it is a ...., jj, Wed, 12 Nov 2003 09:52:57

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