turbo and WOT injector

[David G]

Isn't the problem reversed with the single injector?  Fuel is heavier than
air and that would tend to make it richer in the rear cyl's if the fuel is
in the airstream at/near the TB.
  Dave G


> I disagree,
>   Ask any engineer.  There is a reason they exist.
> Doint it right IS the Best way.  But yours may be
> fine.  Maybe the difference wont be enough to make it
> dangerously lean, just a little leaner than the front
> cyl's.  THe RS-2 and 3B motors have the same problem.
> Audi did an even Better job of compensating than in
> the CIS cars but it still exists.  THey tried to fix
> it by tapering down the air at the rear.
>   THis is why in my 20vt conversion using an AAN I
> plan to build my own intake and have it flow matched.
> With the TB entering towards the front but making an
> effort to balance flow out.
>   ANyhow, I'm sure your 10 injector system will be
> fine for a while.  But try going to 25psi or in the
> real High HP reign and you may have troubles.  But
> that would require a different Intake anyhow.  BUt at
> 13 PSI you can run all day likely and be fine.
>   l8r
>      Todd
>
> --- JShadzi at aol.com wrote:
> >    Theoretically, what you say may be true regarding
> > dist. between cylinders-But, BTDT may prove better
> > than theories at this point.
> >    Since I do have an injector in each runner (and
> > the car is running very well), untill it blows up
> > (its been over 10k miles including track days at 13+
> > psi), I will assume that the way I have chosen to
> > execute the solution is a good one...
> > Javad
> >
> > In a message dated Thu, 24 Aug 2000  5:50:53 PM
> > Eastern Daylight Time, "Buchholz, Steven"
> > <Steven.Buchholz at kla-tencor.com> writes:
> >
> > << The one thing that I have not seen discussed here
> > is the relative
> > distribution of air and fuel to the individual
> > cylinders.  While Audi has
> > tried to even out the flow to each with the large
> > air reservoir in the
> > intake manifold, it remains true that at high flow
> > rates on the WX and MC
> > engines (which have the TB mounted at one end of the
> > reservoir and aimed
> > rearward) there will be more air flowing to the rear
> > cylinders than the
> > front ones.  Given that you have a system that
> > provides the same amount of
> > fuel to each cylinder you will naturally find that
> > the mixture in the
> > rearmost cylinders is on the lean side, while the
> > mixture in the front
> > cylinders will be rich.  Adding pulsed injectors
> > into each intake runner
> > could be used to address this variation, but it
> > would require either
> > individual measurement and control of the mixture at
> > each cylinder or a
> > compensating algorithm that would apportion more
> > fuel to the rear and less
> > to the front.  The thing I've always kinda liked
> > about the sixth injector in
> > the flow is that it actually would tend to
> > distribute the fuel in a similar
> > manner to the distribution of the air.  In this case
> > we are not talking
> > about an injector mounted in the CSI location, but
> > something in the airflow.
> > I forget the manufacturer, but I've seen this sort
> > of setup installed in an
> > urquattro that had bumped up boost.
> >
> > Steve Buchholz
> > San Jose, CA (USA)
> >