Thread: boost bleed off
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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,564
K-Jet injector seals shouldn't leak. I never pulled 930 ones but on other cars there was a rubber O-ring around each. If those leak idle speed will go up and you'll spend ages scratching your head and trying to adjust it. You'll turn idle screws and fiddle with CO-settings but nothing will help. (Isn't this exactly what you did buy the way? )You can use standard O-rings in appropriate dimension. Fix those leaks.

You are lucky that you didn't drive longer with that kind of leaks. If you had so many leaks that turbo started going down in boost then turbo was probably overspeeding trying to compensate. Turbochargers are made to pump air acording to certain mass flow/pressure ratio. It's those fancy island-like graphs.

If you try to force it to push air at high mass flow and low pressure ratio (=off the chart "eye") all kind of bad things can happend. Impeller might start to cavitate at the same time as shaft is overspeeding = impending danger to compressor blades and bearings.
Thank you for your time,
Old 12-19-2007, 02:22 PM
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