[s-cars] air leak....poor performance

[Charlie Smith]

Earlier, Bill Clancy wrote:
> 
> Hello all
> 
> I have had what sounds like an air leak for a couple months or so.    
> I have looked for it a few times but I cannot seem to find it.    
> The performance is poor -- feels like 75% of what I used to get, 
> and I get shitty gas mileage too.    
> 
> Can anyone suggest a place to look for it?   
> 
> I think I have ruled out:
> - the bypass valve (new again)
> - the michelin man hose (replaced with Samco and appears in tact) 
> - the plastic hose before the michelin man hose (appears in tact)
> 
> What other typical failures can cause an audible hissing noise at WOT?   

I chased this around and around last year, and it turned out to
be the plastic crossover pipe, which was split lengthwise on top
of the pipe.  I couldn't see the split until after I removed the
crossover pipe.  I had put on Samco hoses, and had double checked 
the metal insert in the end of the plastic crossover pipe.  All 
looked good, but it still leaked when boost was over about 10 PSI.

I put on one of the aluminum replacement pipes, and it did the job.
Expensive as I recall, but it holds up.

    - Charlie


  Charlie Smith  charlie {at} elektro.cmhnet.org  614-471-1418  
  http://www.elektro.com/~charlie          Columbus Ohio   USA
  http://www.elektro.com/~audi         photos & technical info

  95 S6 Quattro  -  24 PSI, RS2 6 speed, and other features  
  97 Dodge Ram   -  40 PSI, 4x4 w/Cummins turbo diesel