Date: Wed, 30 Mar 2005 16:21:29 -0500 From: Malt_Hound <Malt_Houndnospamm*yahoo.com> Subject: Re: 9000 turbo - no power
Per Laursen wrote: > Malt_Hound wrote: > > >>If the waste gate actuator was disconnected it would never open and you >>would develop too much boost. This would be seen as lots of pep until >>it hits an over boost state and the ECU then shuts down the fuel >>injection and ignition. >> > > > Are you sure about this? I thought the wastegate was left _open_ when the > actuator was disconnected (i.e., all the precious engine fumes bypass the > turbo). > > My '95 9K LPT experienced exactly this (felt 'ordinarily aspired' and lacked > power). Looking first here in the NG and then under the turbo conformed the > diagnosis: locking pin gone, rod disconnected. Hmmm, you may be right. From the SAAB WIS: "The wastegate is a flap valve which opens and closes the bypass channel at the side of the turbo wheel. The flap valve is operated by a lever from the diaphragm unit which is located by the compressor housing. The diaphragm is operated by the pressure in the compressor and a spring in the diaphragm unit has the function of closing the flap. During low and normal loads the wastegate is closed. When the load increases and the turbo pressure comes close to the maximum permitted, the force of the spring is overcome and the wastegate opens the bypass channel, which reduces the pressure." Perhaps when the clip falls off and there is no connection to the diaphragm spring the wastegate is then free to flap around willy-nilly. Sorry about the confusion. -Fred W
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