[s-cars] Vacuum leak

Cory Pio cpio921 at gmail.com
Fri Dec 11 23:07:32 PST 2009 

I appreciate the reply and am constantly learning but was told at idle  
under vac the wastegate was open and pulled shut by the pressure  
changing than is opened again to bleed off boost. Thanks guys... I has  
a fresh n75 h. Correct spark plugs and fuel filter and got the coils a  
new bpv and stiffer wastegate spring coming. Pretty soon I'll be  
getting rid of the maf which could have been toasted from being close  
to exhaust manifold. It was pretty much hitting it sometimes. It can't  
wait until I get suspension all redone and a speed density standalone  
vems. I will probably just buy an evc6 from his to have nice boost  
control and gauge until than

Sent from my iPhone

On Dec 12, 2009, at 1:26 AM, djdawson2 at aol.com wrote:

> With all due respect, I don't think you understand the fundamentals  
> of how a turbo system works at all.  The wastegate doesn't open  
> under any circumstances until the pressure within the exhaust  
> manifold reaches a certain point, and/or pressure is applied via the  
> n75 to the wastegate.  As such, there is no possibility that your  
> wastegate is "hesitating to shut."
>
> The BPV, on the other hand, is always open when there is a vacuum  
> present in the intake manifold.  It closes as soon as you open the  
> throttle off idle.  This can be a point of failure for achieving  
> boost, and very easy to test.
>
> Replacing your ecu, your ignition coils, getting rid of your MAF,  
> blah blah blah with "shiny new parts" isn't going to do squat... you  
> need to figure out what's wrong with your system as-is, and fix it.   
> I'd suggest you try and learn a little bit before you start throwing  
> parts at a problem you don't understand.
>
>
> -----Original Message-----
> From: Cory Pio <cpio921 at gmail.com>
> To: Robert Myers <bob at chips-ur-s.com>
> Cc: s-car-list at audifans.com <s-car-list at audifans.com>
> Sent: Fri, Dec 11, 2009 11:04 pm
> Subject: Re: [s-cars] Vacuum leak
>
> I guess I'm asking is it possible my wastegate or bpv are hesitating
>
> to shut quickly on off throttle because of a vacuum leak?
>
>
>
> Sent from my iPhone
>
>
>
> On Dec 12, 2009, at 12:57 AM, Robert Myers <bob at chips-ur-s.com> wrote:
>
>
>
> > *This message was transferred with a trial version of CommuniGate(r)
>
> > Pro*
>
> >
>
> >
>
> > Cory,
>
> >
>
> > If you hear air escaping --- YOU HAVE A LEAK!  Period.  You simply
>
> > must find it and fix it or the car won't run worth crap until you
>
> > do.  Yeah, finding a leak isn't glamorous but you simply have to do
>
> > it or you're just pissing into the wind.
>
> >
>
> > Bob
>
> >
>
> >
>
> >
>
> >
>
> > At 12:49 AM 12/12/2009, Cory Pio wrote:
>
> >> *This message was transferred with a trial version of CommuniGate
>
> >> (r) Pro*
>
> >> Yeah I'm thinking it could be my retarded intake setup Inherited  
> from
>
> >> the PO. I'm getting a fuel trim code adaptation limit exceded. I
>
> >> already replaced the plugs and fuel filter. I have HO coils  
> coming in
>
> >> from 034. I'm thinking of just switching to a 1.8 bar spring
>
> >> getting a
>
> >> bpv and going with vems ecu to get rid of the maf which seems to be
>
> >> tied into my n75 valve. Hopefully going big turbo and redoing  
> alot of
>
> >> stuff this problem will go away. Just tedious annoying things like
>
> >> vacuum leaks piss me off when troubleshooting in the freezing  
> cold. I
>
> >> rather be bolting in some shinny new parts. The wastegate or bpv is
>
> >> de
>
> >> staying open when I give little throttle.
>
> >>
>
> >> Or for a better example when I get into boost and let off throttle
>
> >> boost goes bye. Well when I get back into it at higher rpm it  
> hardly
>
> >> comes out of vacuum and I can still here air escaping. Hmmmmmm
>
> >>
>
> >> Sent from my iPhone
>
> >>
>
> >> On Dec 11, 2009, at 9:57 PM, Robert Myers <bob at chips-ur-s.com>  
> wrote:
>
> >>
>
> >>> *This message was transferred with a trial version of CommuniGate 
> (r)
>
> >>> Pro*
>
> >>>
>
> >>> The "vacuum pump" under the rear seat operates the pneumatic  
> locking
>
> >>> system and has nothing to do with your boost or lack thereof.
>
> >>>
>
> >>> If I read your complaint correctly I think you are complaining  
> that
>
> >>> your engine is showing turbo lag.  This is 100% normal for a
>
> >>> turbocharged engine,  If boost is not coming on as early as it  
> used
>
> >>> to and/or it isn't getting as high as it used to then you may well
>
> >>> have a leak in the induction system.  There are several cute  
> tricks
>
> >>> to locate such leaks.  Some work in one case but not in others.
>
> >>>
>
> >>> If you have a leak while idling (the leak is open at low  
> pressures)
>
> >>> try spraying ether based starter fluid over the plumbing while the
>
> >>> engine is idling.  If ether hits the leak some of it will be drawn
>
> >>> into the system and the engine rpms will pick up.  This can help
>
> >>> find such a leak.
>
> >>>
>
> >>> You can construct a simple gadget from a 4-6" piece of 3" PVC  
> pipe,
>
> >>> a 3" cap, some PVC glue, and a tire valve.  Use this gadget and  
> some
>
> >>> shop air to pressurize your induction system to perhaps 7-10 psig.
>
> >>> Listen for a hiss sound from the plumbing and track it down.
>
> >>>
>
> >>> Of course if you have a BIG leak you can't get enough air in the
>
> >>> system to inflate it even a little.  Start looking for likely
>
> >>> leaks.  The very first place to look is the Michelin Man hose  
> (from
>
> >>> the crossover pipe to the intercooler inlet) and closely inspect  
> it
>
> >>> for leaks - take it out and flex/bend/twist/etc to expose and
>
> >>> potential leak. if it isn't there then do the same with other
>
> >>> portions of the system.
>
> >>>
>
> >>> Do not ignore the small tubing connected to the water trap.   
> Earlier
>
> >>> s-cars look for the trap high on the engine side of the firewall
>
> >>> near the rear of the engine.  It is a little larger than a 35mm  
> film
>
> >>> cannister.  Later models have the trap located under the carpet  
> near
>
> >>> the ECU.  Trace the MAP hose back from the ECU to find the trap.
>
> >>>
>
> >>> Bob
>
> >>>
>
> >>>
>
> >>> At 09:36 PM 12/11/2009, you wrote:
>
> >>>> *This message was transferred with a trial version of CommuniGate
>
> >>>> (r) Pro*
>
> >>>> Alright guys
>
> >>>>
>
> >>>> Im thinking a vacuum leak might be giving me wastegate/ bpv
>
> >>>> problems. My car pulls about -15 hg in.  When fully warmed up. It
>
> >>>> used
>
> >>>> to do 20. So my question is my car locking system and the vacuum
>
> >>>> pump
>
> >>>> under my rear seat a good place to start looking for leaks?
>
> >>>>
>
> >>>> My symptoms are my car doesn't go into boost right away . The
>
> >>>> wastegate or bpv seems to be staying open unless you really get  
> on
>
> >>>> it.
>
> >>>> Any help would be much appreciated.
>
> >>>>
>
> >>>> Thank you
>
> >>>> Cory pio
>
> >>>> _______________________________________________
>
> >>>> S-CAR-List mailing list
>
> >>>> http://audifans.com/mailman/listinfo/s-car-list
>
> >>>> http://www.audifans.com/kb/List_information
>
> >
>
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