[Vwdiesel] Need Some Clarification !

[Nate Wall]

That would make sense from what Chris reports on the
injector size. Since the Auto Tranny TDI models have a
larger bore pump and SMALL diameter injector holes,
then you'd get about the same fueling, but it would be
higher pressure and a finer spray in the automatic
models. Hense slightly reduced emissions
(particulates, mainly)

--Nate
--- TexasTDI <texasvwdriver at hotmail.com> wrote:
> Interesting.
>
> Learn something new everyday.  }:o)
>
> Chris Thornton
> 1991 VW Jetta 2 Door 1.6 Diesel - 237k miles
> 2000 VW Golf 1.9 TDI (turbo diesel) - 82k miles
> Amsoil Synthetic Lubricants Dealer #1098500
> http://texastdi.com/6/ubb.x
> http://www.amsoil.com
>
> ----- Original Message -----
> From: "Nate Wall" <natewall1 at yahoo.com>
> To: "TexasTDI" <TexasVWdriver at hotmail.com>; "Shawn
> Wright"
> <swright at zuiko.sls.bc.ca>
> Cc: <vwdiesel at vwfans.com>
> Sent: Wednesday, May 21, 2003 9:22 AM
> Subject: Re: [Vwdiesel] Need Some Clarification !
>
>
> > The larger bore pump in the automatics is soley
> for to
> > meet emissions standards. In order to do this, the
> > injection pressures have to be higher on the
> automatic
> > tranny TDIs, hence the larger bore pump
> >
> > --Nate
> >
> > --- TexasTDI <TexasVWdriver at hotmail.com> wrote:
> > > That's the way VW made them.  The 5 speed gets a
> > > 10mm pump and .184mm
> > > injectors.  The automatic gets an 11mm pump and
> > > .158mm injectors.
> > >
> > > The automatic TDI gets less fuel mileage because
> of
> > > the transmission.
> > > Automatic cars always get less mileage than 5
> > > speeds.
> > >
> > > Chris Thornton
> > > 1991 VW Jetta 2 Door 1.6 Diesel - 237k miles
> > > 2000 VW Golf 1.9TDI (turbo diesel) - 82k miles
> > > Amsoil Synthetic Lubricants Dealer #1098500
> > > http://www.amsoil.com
> > > http://texastdi.com/6/ubb.x
> > >
> > > ----- Original Message -----
> > > From: "Shawn Wright" <swright at zuiko.sls.bc.ca>
> > > To: <vwdiesel at vwfans.com>
> > > Sent: Tuesday, May 20, 2003 6:54 PM
> > > Subject: Re: [Vwdiesel] Need Some Clarification
> !
> > >
> > >
> > > > Larger fuel pump? Why is this? My Dad's
> noticed
> > > his '02 auto gets worse
> > > > mileage (about 45-48mpg imp)  than his '01 5sp
> > > (50-55mpg imp) (both
> > > > Jettas), but I'd have thought this wouldn't
> matter
> > > to the fuel pump...
> > > >
> > > > On 20 May 2003 at 18:46, TexasTDI wrote:
> > > >
> > > > > Yes, if her's is an automatic.  5 speed is
> to be
> > > changed at 60k.  The
> > > reason for
> > > > > this is the timing belt runs the fuel pump.
> And
> > > the automatic TDI has a
> > > larger
> > > > > fuel pump than a 5 speed (11mm vs. 10mm).
> > > > >
> > > > > Chris Thornton


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