[s-cars] stumbling

[serge]

Sound like a fuel issue to me. How old is the fuel filter? Next in line is
the Fuel Pressure Regulator, and finally the pump itself.


Serge Filanovsky

95 S6 Avant



> Today my 95 s6 started hestitating, especially under harder acceleration.
> Idle is a bit rough but no stalling.  Under light acceleration there is an
> occasional miss.  If I get boost up to 5 psi it misses like crazy.  To get >
> 5psi I have to really put my foot into it (much more than usual).  Vacuum is
> normal at 18-19 " hg.  At constant rpm without acceleration it drives almost
> normal.  Any ideas on where to start diagnosing?
> 
> The car drove fine when I first started it after work.  On the way home I
> stopped for 1/2 hour in a store and when I started it up it was 'broken'.
> It's the first really cold day of the year so I topped the tank with fresh
> gas and tried gas drier, to no avail.
> 
> I'll start snooping the archives, but since this is my first driveability
> issue I'm not really sure where to start...
> 
> Thanks for any pointers!
> 
> Ed
> -----Original Message-----
> From: s-car-list-bounces+eestabrook=syntheticnets.com at audifans.com
> [mailto:s-car-list-bounces+eestabrook=syntheticnets.com at audifans.com]On
> Behalf Of Trevor Frank
> Sent: Tuesday, December 02, 2003 7:09 PM
> To: Joseph Pizzimenti; Lewis, Gary M; s-car-list at audifans.com
> Subject: RE: [s-cars] Bypass valves - Which one?
> 
> 
> So I just got an email from someone and I realize I forgot to mention
> the most significant difference.
> 
> A diaphragm style valve has a larger surface area on the vacume side,
> and smaller on the plunger side.  This also effects the speed of opening
> and force that is generated, plus with such a diferential you should
> need less spring, you also have much more force holding the valve closed
> this again would require less spring relative to a plunger style.
> 
> Of course this is all on the chalk board.
> 
> -----Original Message-----
> From: Trevor Frank
> Sent: Tuesday, December 02, 2003 12:20 PM
> To: Joseph Pizzimenti; Lewis, Gary M; s-car-list at audifans.com
> Subject: RE: [s-cars] Bypass valves - Which one?
> 
> 
> So I really like the diaphragm style, 2 reasons.
> 1) it takes a bit of engineering and capitol to manufacture a good
> diaphragm style bypass valve.  Otherwise I could make it.
> 2) Low inertial mass, quicker response, the bosch is really the epitome
> of this all others are degree's worse.  Big aluminum, plastic slugs are
> pretty serious offenders, the worse being brass.
> 
> -----Original Message-----
> From: Joseph Pizzimenti [mailto:pizzoman at yahoo.com]
> 
> Sent: Tuesday, December 02, 2003 12:02 PM
> To: Lewis, Gary M; s-car-list at audifans.com
> Subject: Re: [s-cars] Bypass valves - Which one?
> 
> Bailey stinks, especially for that cfm you're flowing,
> Gary.  The internals are still rubber/plastic.  The
> TXS 34mm is too big for our plumbing, unless you have
> the 2Bennett Samco?  I used the TXS H-25 on my RS2
> turbo, clean as a whistle.
> 
> Joe
> 
> --- "Lewis, Gary M" <gary.m.lewis2 at BOEING.COM> wrote:
>> I'm running:
>> RS2 MAF, RS2 Exhaust Manifold, RS2 Injectors, Custom
>> Turbo (K26 Turbine, Factory K26 Cold side (Audi
>> Works '999' P/N) with 50mm intake and custom
>> Innovative Turbo compressor wheel, life begins at
>> 3,400 rpm)= RS2 Comp++, and 26 psi VMAP-D software.
> 
>> Call it 375hpish.
>> 
> 
>> I've looked at Hyperboost, Forge, Bailey, and the
>> TurboXS H34.  The Bailey looks the best, but
>> opinions?
>> 
> 
>> Thanks,
>> Gary Lewis
>> 
> 
>> 1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust
>> Manifold, RS2 Injectors, Custom Turbo (K26 Turbine,
>> Factory K26 Cold side (Audi Works '999' P/N) with
>> 50mm intake and custom Innovative Turbo compressor
>> wheel), Bilsteins, Eibachs, Big Reds, Spec II
>> Clutch.
>> 
> 
>> _______________________________________________
>> S-CAR-List mailing list
>> S-CAR-List at audifans.com
>> http://www.audifans.com/mailman/listinfo/s-car-list
> 
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