S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Homebrew Stage III Experts needed for help: I have been fighting overboosting issues

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Old Mar 19, 2008 | 04:13 PM
  #11  
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The hole in my mbc is plugged~
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Old Mar 19, 2008 | 04:15 PM
  #12  
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Default I have tried 3 different N75 valves that I know work. I will double check my plumbing

but I am 99% sure it is correct. I have the diagram and went right off that. Whats up Carter, Psyched about the wheels!!!
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Old Mar 19, 2008 | 04:29 PM
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basically you shouldn't hear any air escaping
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Old Mar 19, 2008 | 05:04 PM
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ditch the HB and get a custom tune.
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Old Mar 19, 2008 | 05:26 PM
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Default Was it plugged when you ran MBC only?

I suspect (as others) you have a leak in the WG line.
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Old Mar 19, 2008 | 05:50 PM
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Default no it wasn't plugged when running MBC only. I put epoxy on it last night,

plus I have a spare that has a check valve as well. I tried them both. What does plugging the hole do anyway?
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Old Mar 19, 2008 | 05:52 PM
  #17  
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Default I agree, but unfortunately I don't think that woudl fix my overboosting problem,

especially if I have a boost leak on a WG Line.
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Old Mar 19, 2008 | 05:52 PM
  #18  
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If I had a WG leak would I hear it from under the car if I did a pressure test?
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Old Mar 19, 2008 | 05:53 PM
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yes!
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Old Mar 19, 2008 | 06:02 PM
  #20  
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Default Awesome, I will put it on the rack tomorrow and let you know. 20psi enough for stage III pressure

test?
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