oops hit wrong key. I have been discussing this with Bill J under Sully's query near end of this page. "Base boost" is positive pressure above ambient barometric pressure established by the engine boost management system. It is basicly set by a spring in the turbo wastegate motor and monitored by the manifold pressure sensor to smooth thing out (depending on YM car) and adjusted as required by many inputs from various sensors. "Base boost" can be measured easily by disabling the speed sensor (safest method) or by disabling the BPS function- removing the connector. Removing the connector to the Boost Pressure Solenoid(BPS) prevents any modulation by boost pressure or the removal of compression on the spring in the Wastegate motor. The performance getting there could be a little "lumpy" because the system isn't in control of the modulation. You should reach approximately the mid range of the solid yellow before the red stripes and yellow zone - This depends on your altitude operation because of pumping efficiencies and turbo equipment.

The capability is there even when the engine isn't running but "boost" is a function of exhaust gas flow, waste gate position and turbo pumping resistance driven by the turbine in the exhaust stream. One must reach approximately 2500 RPM T25 or 2300 RPM TD04 before base boost is exceeded.
Hope this answers your question

• Aero B-b-b-boost Question! Please Help!, Brian, Fri, 20 Jul 2001 11:20:39
  • A bit of a shot in the dark..., BillJ, Fri, 20 Jul 2001 18:37:04
  • Re: Brian, the problem you are describing is fuel interruption, aero guy, Fri, 20 Jul 2001 14:51:58
    • AG, can you elaborate on how one would do the tests you..., Bill Cannastra, Fri, 20 Jul 2001 15:22:50
      • Re: Bill, I am a little confused are you Bill J in London or ano, aero guy, Fri, 20 Jul 2001 16:42:44 <-- Viewing This Message
        • Thanks, AG. Is it possible for a novice to measure base..., Bill Cannastra, Sat, 21 Jul 2001 14:13:45
          • Bill- it could be a bad bpc valve, James, Sun, 22 Jul 2001 09:48:55
      • Re: Bill, I am a little confused are you Bill J in London or ano, aero guy, Fri, 20 Jul 2001 16:06:14
        • Bill Cannastra: London, Ontario, Canada ; not Bill J..., Bill Cannastra, Fri, 20 Jul 2001 16:39:08
          • Re: Sorry I just got confused working three places same problem, aero guy, Fri, 20 Jul 2001 20:20:04
  • Re: Aero B-b-b-boost Question! Please Help!, Jim in VA, Fri, 20 Jul 2001 12:08:41
    • I am in this boat as well, and it is taking on water!, chudzik, Fri, 20 Jul 2001 13:42:04
      • Are you hitting the boost cut-off? That's a really, jj, Fri, 20 Jul 2001 14:09:01
        • Re: Are you hitting the boost cut-off? That's a really, Brian, Fri, 20 Jul 2001 14:18:54
  • It could be ignition, try a new set of correctly, jj, Fri, 20 Jul 2001 12:04:45
  • Re: Aero B-b-b-boost Question! Please Help!, sully, Fri, 20 Jul 2001 11:28:46
    • I thought I was the only one..., Bill Cannastra, Fri, 20 Jul 2001 11:57:32
      • Bill, you really don't want to experiment with, jj, Fri, 20 Jul 2001 12:13:47
        • I'll be carefull, JJ., Bill Cannastra, Fri, 20 Jul 2001 14:19:46
          • I'm not sure I follow your logic on using a MBC to, jj, Fri, 20 Jul 2001 14:56:32
            • JJ, perhaps I'm off base, but my understanding of the MBC..., Bill, Fri, 20 Jul 2001 15:10:18
              • The only way to bleed off boost is to make the, jj, Fri, 20 Jul 2001 16:38:37
    • Sully..., Brian, Fri, 20 Jul 2001 11:52:29
      • Re: Sully..., sully, Fri, 20 Jul 2001 16:22:41

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