[s-cars] RE: Baffled over boost

[Bill Clancy]

I had a (very) loose clamp on the lower turbo hose where it met the 
crossover pipe.   When the pressure built up to a certain point, it 
would blow out suddenly.   There was enough of a seal to hold it for a 
few PSI and it would hold at 1/4 throttle, but blow out if I pushed on 
the gas pedal too far.    
As others suggested, I would have thought the bypass diverter valve 
too.   Are you sure the one that is in there is strong enough?    I had 
to replace mine with a forged one from ECS, although I didn't have 
exactly the problem that you describe.

You are talking about the bypass diverter valve right?   not the 
wastegate bypass regulator valve?    As a test you can disconnect the 
vacuum from the wastegate to that valve.   And if you have a boost 
gauge, you could watch it to see if there is a difference with the 
vacuum to the valve disconnected.   





Mock, Bruce J (Bruce) wrote:

>Whoops again - update to my update  (Sorry)
> 
>I checked and replaced the Bypass valve.  It was bad - but did not solve this boost issue
> 
>I have also pulled a vacuum on the Waste Gate - the diaphragm holds a vacuum
> 
>Thanks
> 
>Bruce
> 
>
><[Mock, Bruce J (Bruce)] snip> 
>
>
>Hi Guys:
> 
>This list is truly priceless.  I've been on this list almost since its humble beginning and have soaked-up immeasurable bits of wisdom to the point where I feel like NO matter what goes wrong with my '93 S4,  (and at 175,000mi it really has not been much at all! )  I can tackle the problem.  I know most all of us would agree about the great worth of this virtual community.  Thanks guys.
> 
>This little problem has me completely stumped:
> 
>Again:  '93 S4 w/ 175,000mi stock expect for MTM stage 1 chip and RS2 Ex. manifold.
><snip>
>
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