WOT boost

[Bernard Littau]

You have eliminated most of the obvious problems with the new ignition
stuff, and having checked the control pressure.  Figuring out how to monitor
the O2 sensor would be a good next step.  If the O2 sensor oscillates around
0.5V in normal driving and at idle, then it is likely working correctly.  At
WOT, if it shows rich, then the problem is likely ignition.  If it shows
lean, then fueling is likely the problem.

An analog volt meter with a 2V scale should do it, as long as the road is
smooth and you have a buddy doing the reading.

Some of the old Idle/WOT switches are supposedly flaky, even if they test
correct on-the-bench.  You may want to wire up a switch that lets you set
WOT from the passenger compartment, and see what happens if you have a good
WOT signal.

Best,

Bernard Littau
Woodinville, WA
'88 5ktq

> -----Original Message-----
> From: Brandon Rogers [mailto:brogers at terrix.com]
> Sent: Friday, March 08, 2002 12:28 PM
> To: Bernard Littau
> Cc: quattro at audifans.com
> Subject: Re: WOT boost
>
>
> Thanks for the input-
> I don't know if I can monitor the O2 sensor while driving--it is however,
> new.  I should have set Duty Cycle is set at 43-50% when
> idling--those words
> escaped me when I posted.  I wonder if the fuel pump is aging.  My system
> and control pressure are fine, however maybe at high rpm they are low.  ??
> Other ideas??
>
> Brandon
> '84 ur
> '98 A4
>
> ----- Original Message -----
> From: "Bernard Littau" <bernardl at acumenassociates.com>
> To: "Brandon Rogers" <brogers at terrix.com>; <quattro at audifans.com>
> Sent: Friday, March 08, 2002 11:21 AM
> Subject: RE: WOT boost
>
>
> > Sounds like you may be going lean at higher throttle.  Can you monitor
> your
> > O2 sensor in any way?
> >
> > WOT switch tends to activate at 60% or so throttle position, and is easy
> to
> > test with an ohm meter and the engine off.  Like you said, unlikely.
> >
> > Not sure what you mean by "Frequency valve set to apprx 43-50%
> range".  Is
> > this set statically, or is this what you are monitoring when you are at
> WOT?
> >
> > [snip]
> > > When I give it WOT, the boost does not feel quite as strong and
> > > there are a
> > > couple hiccups as the tach continues to 6000 rpm.  The hiccups are
> minor,
> > > but they do not occur at less than WOT.  FYI, patient is '84 urquattro
> w/
> > > k24 turbo, 268/270 cam, IA chip.  I live in Denver at 5300 feet
> > > and I have a
> > > modded wastegate with a stiffer spring(IA?).
> > [snip]
> >
> > Best,
> >
> > Bernard Littau
> > Woodinville, WA
> > '88 5ktq
> >
>
>