[s-cars] Found 10 PSI Fuel Pressure and .8 Volts

[Dave Forgie]

Sean:  Can you describe you apparatus for that test?  I remember that you
had to get some fittings from Force 5 or Shokan or somewhere. (??)

Dave F.

Sean Douglas wrote:

> Good point Cody, I'm not sure if the injectors running makes a
> difference.
>
> It would be interesting if you could do the test using the same
> methodology as I did to eliminate the variables.
>
> Cheers.
>
> Sean
>
> > -----Original Message-----
> > From: Cody Payne [mailto:cpayne at bconnected.com]
> > Sent: Sunday, November 06, 2005 7:59 PM
> > To: Sean Douglas; Dave Forgie; s-car-list at audifans.com
> > Subject: RE: [s-cars] Found 10 PSI Fuel Pressure and .8 Volts
> >
> >
> > Hey Sean,
> >       Thanks for your data.
> >
> > At idle w/ vac I am at 62 PSI.  Under WOT around 5200 RPM my
> > boost gauge reads around 25 PSI...so I should see 87 PSI on
> > my fuel gauge..but only seeing ~70 PSI now vs. ~60 PSI before
> > the new relay.
> >
> > So I am still short ~17 PSI.  So really the difference
> > between my test, is that my injectors are running high duty
> > as well as the loads on the alternator.  I would expect that
> > your expected and actual pressures would be slightly
> > different due to those 2 variables...but I could be wrong?
> >
> > Cheers
> >
> > cp
> >
> >
> >
> > -----Original Message-----
> > From: Sean Douglas [mailto:quattro20v at telus.net]
> > Sent: Sunday, November 06, 2005 8:41 PM
> > To: Cody Payne; 'Dave Forgie'; s-car-list at audifans.com
> > Subject: RE: [s-cars] Found 10 PSI Fuel Pressure and .8 Volts
> >
> > Cody:
> >
> > When you measured your fuel pressure at WOT, what manifold
> > pressure are you seeing? I only ask because the fuel pressure
> > is dependent on the manifold pressure and is controlled by
> > the fuel pressure regulator.
> >
> > I did this last year, but did the test differently. After
> > relaying the fuel pump as per Dave Forgie's instructions, I
> > put a pressure gauge inline on the supply line, manually
> > jumped the fuel pump so it was on (engine off) and
> > disconnected the vacuum / boost line to the fuel pressure
> > regulator and pressurized this with regulated compressed air.
> > Starting at 0 PSI and going up in various steps to 28 PSI, my results
> > were:
> >
> >
> > 0 PSI, 57 PSI
> > 10, 65
> > 15, 70
> > 20, 75
> > 22, 77
> > 25, 79
> > 28, 83
> >
> > By my calculations, I was 4-5% below the target fuel pressure
> > across all values. The voltage at the pump was 12.4 volts,
> > perhaps when the engine is running, the voltage will go up
> > and hence the fuel pressure.
> >
> > The reason I did all this testing was because with the RS2
> > mods, I was running lean (pinging) and wanted to see if I had
> > enough fuel pressure. In the end I decided it was a software
> > issue and switched software (to
> > Dahlback) and now the pinging is 99% gone.
> >
> > Sean Douglas
> >
> > > -----Original Message-----
> > > From: s-car-list-bounces at audifans.com
> > > [mailto:s-car-list-bounces at audifans.com] On Behalf Of Cody Payne
> > > Sent: Sunday, November 06, 2005 6:21 PM
> > > To: Dave Forgie; s-car-list at audifans.com
> > > Subject: Re: [s-cars] Found 10 PSI Fuel Pressure and .8 Volts
> > >
> > >
> > > For those who have a fuel pressure gauge on their
> > cars...what sort of
> > > pressure have you seen from your stock fuel pump?
> > > Can you get 86+ PSI WOT?
> > >
> > > Granted the set-up I had today was great as I could drive
> > and view the
> >
> > > fuel pressure gauge mounted on the hood.  But on the dyno
> > works great
> > > too ;)
> > >
> > > My stock fuel pump is about 3 years old.
> > >
> > > Thx
> > >
> > > cp
> > >
> > > -----Original Message-----
> > > From: s-car-list-bounces at audifans.com
> > > [mailto:s-car-list-bounces at audifans.com] On > Behalf Of Dave Forgie
> > > Sent: Sunday, November 06, 2005 7:10 PM
> > > To: s-car-list at audifans.com
> > > Subject: [s-cars] Found 10 PSI Fuel Pressure and .8 Volts
> > >
> > > You're welcome Cody.  But at 70 psi you are still down at
> > least 16 psi
> >
> > > from the minimum 86 psi you need at 28 psi relative boost
> > (58 psi (4
> > > bar) plus 28 psi boost).  I suspect that your 091G is got a problem
> > > -either its weak or its inlet is clogged.
> > >
> > > Dave F.
> > >
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