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ivanuf 02-23-2018 03:29 PM

No Boost is this the cause?
I am getting no boost. My first check is the waste gate. I aplied about 15-20 psi thru the lower port and have air blowing around the blue circle area of the photo.

Is my wastegate shot, is this the cause of the no boost condition or this is normal?

'76 911S 3.0 02-23-2018 04:40 PM

Does the wastegate valve open when you apply pressure to the bottom port? If that were leaking, I would suspect you would have the opposite issue and be overboosting since the wastegate would not be opening.

Pat RUFBTR 02-24-2018 03:21 AM

When the rubber internal membrane is pierced that causes(provokes) a big pressure, we check(control) nothing more, the flight(leak) of air in your blue circle causes(provokes) maybe the opposite, anyway the wastegate never has to have of flight(leak) of air, you have to change the fibrous joint which is towards(at the place of) the blue circle. :)

ivanuf 03-01-2018 06:56 AM

Thanks for the help. I will install my Tial for now and put this on the to do list.

reclino 03-02-2018 02:17 PM

Looks like your gasket is blown between the hot and cold side. I was unable to purchase these new so made a small batch of gaskets, valve guides, and spring shims to make it possible to rebuild these wastegate's.

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