[Vwdiesel] [Audi-VW-Diesels] Turbo conversion

Fri Aug 4 14:06:43 EDT 2006

The number is 068 130 107 A which according to more
than one conversation on the list is indeed a yellow
dot.

If a non-yellow dot has a normal setting of about .9
but can be set to an advance of 1.00, is there an
advance setting capability for the yellow dot?  I've
only ever heard 1.15mm mentioned.

David

--- James Hansen <jhsg at sasktel.net> wrote:

> What is the number of the pump?
> As in, are you sure it is a yellow dot pump, not
> just has yellow paint 
> marker sealing the threads on stuff? They are not
> common...
> 
> timing is more advanced on a YDP.
> -J
> 
> David Cook wrote:
> > Thanks James-
> > 
> > I was planning on probably just replacing the volt
> > gauge on the Cabby (doesn't work all that great
> > anyway...) with an EGR if I did the conversion.
> > 
> > I do know about the fuel screw and adjusting it,
> > though I haven't practiced with it a whole lot. 
> > (Haven't needed to really.)  
> > 
> > I do have a yellow dot pump, does that change
> > anything?
> > 
> > David
> > 
> > --- James Hansen <jhsg at sasktel.net> wrote:
> > 
> >> Start with the injectors you have.  No big
> >> difference from a performance 
> >> perspective from what you will see running
> >> essentially a detuned td.
> >>
> >> As far as pumps go, there is no difference in
> >> operation between the TD 
> >> and NA pumps aside from the boost aneroid on the
> td
> >> pump.  What it does, 
> >> is add additional fuel when the engine is under
> >> boost, and limit fueling 
> >> when there is no boost.  How much and how fast it
> >> comes on is 
> >> adjustable, but only adds fuel up to the amount
> set
> >> by the max fuel 
> >> screw.  For starters, you can try this setup
> without
> >> a TD pump, but the 
> >> differences are when you have a mechanical pump
> set
> >> up to provide the 
> >> right fuel under boost, in off boost conditions
> >> (like between shifts) 
> >> you will see a puff of smoke until boost comes
> on.
> >> A pump that has higher max fuel setting and no
> >> aneroid will outperform 
> >> the one with the aneroid, but will smoke when off
> >> boost.
> >>
> >> Just a note about boost pressures.  The
> difference
> >> between a diesel with 
> >> a turbo to add air to increase the VE (volumetric
> >> efficiency), and hence 
> >> efficiency overall, and one that is adding
> >> additional fuel to take 
> >> advantage of the extra O2 that is there under
> boost
> >> conditions is huge.
> >> More fuel initially may smoke, but the boost
> >> pressure rises very 
> >> quickly, is very driveable, has no discernable
> lag. 
> >> This is not how you 
> >> would set things up if shooting for fuel mileage
> for
> >> instance.  No 
> >> aneroid and no puff of smoke will give you an
> engine
> >> that is only a tad 
> >> better than you have, but will run cooler, and
> get
> >> better mileage.
> >> Bear in mind, mileage is largely controlled by
> your
> >> right foot in a 
> >> diesel anyway, so if you can drive for mileage,
> you
> >> will get it.  If you 
> >> can't, you won't.
> >>
> >> Some internal differences...
> >> heh...., yeah well, those internal differences
> are
> >> what makes it a 
> >> turbocharged engine versus a non-turbocharged
> >> engine.
> >> There are surprisingly few differences between a
> >> triathlete and someone 
> >> with good cardio but carrying twenty extra
> pounds.
> >> Only one will do triathlons.  that is kind of the
> >> difference here.
> >>
> >> Do not ever delude yourself that you can always
> >> drive it with less 
> >> throttle, or that the ONE time you borrow the car
> to
> >> a friend it will 
> >> not melt a piston going up that long grade in one
> >> gear too high unless 
> >> you take steps to prevent that entirely.  It's
> not a
> >> big deal to 
> >> accomplish, but exhaust gas temperature is
> >> controlled entirely by the 
> >> maximum allowed fueling, and that is what you
> have
> >> to setup with some skill.
> >>
> >> It would be monumentally foolish to lose an
> engine
> >> over not buying a 
> >> fifty buck exhaust temperature gauge.  Install
> this
> >> pre-turbo when you 
> >> install the TD components.  Then you know for
> sure
> >> what you have, you 
> >> know the amount of fueling required to attain
> >> performance without 
> >> decreasing longevity.   Once this is installed,
> you
> >> can do some WOT runs 
> >>   and see what it gets to.  If the pump is set to
> >> factory spec for an NA 
> >> engine, you will very likely see low temps to
> start
> >> with...  So... to 
> >> attain better performance and mileage, you are
> most
> >> likely going to have 
> >> to increase fueling.  Not to be an ass, but if
> you
> >> don't know which 
> >> screw this is, or how to do this, buy a book
> about
> >> Bosch fuel injection 
> >> systems,  specifically one on VE pumps.  You will
> >> never regret this.
> >>
> >>   Once the pump is set to give a max EGT of
> >> 1000-1100, you should be at 
> >> a point of best state of tune and longevity-
> (with
> >> pump timing at 1.00mm)
> >>
> >> Need timing tools, ZDMAK is pretty economical,
> and
> >> he has treated me fairly.
> >> -James
> >>
> >>
> >>
> >> David Cook wrote:
> >>> Hey all-
> >>>
> >>> I know where I could get a kit of parts off a
> >> turbo
> >>> diesel Jetta to install on my Cabby's engine.  
> >>>
> >>> I know the general concensus is that there are
> >> some
> >>> internal differences in the engine, but as long
> as
> >> I
> >>> don't go crazy on the accelerator it should be
> >> okay.
> >>> Here is the question:  Do I need a different
> >> injector
> >>> pump and injectors, or can I continue to use the
> >> ones
> >>> on the motor right now?  I know that the pop
> >> pressure
> >>> on the td injectors is a little higher, but how
> >> much
> >>> difference does it really make?
> >>>
> >>> Thanks,
> >>>
> >>> David
> >>>
> >>> David Cook
> >>> Red '86 Cabriolet Diesel Powered
> >>> Red '90 g60 Corrado 
> >>> Brown and White '78 Westy Campmobile "Bear"
> >>> and others in various states of disrepair
> >>> Pictures here:
> >> community.webshots.com/user/superdave5599
> >>>
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> > 
> > 
> > David Cook
> > Red '86 Cabriolet Diesel Powered
> > Red '90 g60 Corrado 
> > Brown and White '78 Westy Campmobile "Bear"
> > and others in various states of disrepair
> > Pictures here:
> community.webshots.com/user/superdave5599
> > 
> > __________________________________________________
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> 

David Cook
Red '86 Cabriolet Diesel Powered
Red '90 g60 Corrado 
Brown and White '78 Westy Campmobile "Bear"
and others in various states of disrepair
Pictures here: community.webshots.com/user/superdave5599

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