[s-cars] stumbling

[Gabriel Caldwell]

How old is the O2 sensor?

Gabriel Caldwell
Tsunami Solutions Ltd.
#202 - 2055 Boundary Road
Vancouver, BC Canada V5M 3Z1
voice: 604.299.5855
fax: 604.648.8158
e-mail: gabriel at ts.bc.ca
url: www.tsunamisolutionsltd.com

-----Original Message-----
From: Edward Estabrook [mailto:eestabrook at syntheticnets.com] 
Sent: December 2, 2003 6:03 PM
To: s-car-list at audifans.com
Subject: [s-cars] stumbling

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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