Re: Snorkel boy (stirring the pot)

["Chris DeLong" <green536@hotmail.com>]

Alright there Mr. Mycarisinpiecesforever.

Base parameter settings is what the computer takes its BASE settings from.
When the throttle goes off idle the airflow potentiometer gives the computer
info as to the position of the airflow sensor plate. The computer then
calculates (with input from the O2 and temp sensor) the correct power needed
to feed the DPR. If the BASE setting is incorrect then all other inputs to
the computer will be null as  the input is incorrect anyway. The DPR only
controls what it can within certain parameters. IF it (the computer) doesnt
have the correct BASE settings then everything will be off. Hence, lack of
power.

So, story is as follows: Shannon adjusts his fuel mixture, Shannon notices
more power. Cant argue with that.

Not mention the fact that a CIS-E car can run with the computer disconnected
(provided the adjustments are done). That would mean NO DPR control.

Hmmmmm time to check that Haynes(underwear) manual gain there Mr. :)



> BBBBZZZZTtttttttttttt
>
> We aren't talking about the function of the fuel distributor and I just
read
> the section you refer to which clearly covers only the function of the
idle
> mixture screw adjustment as it relates to adjusting the C0 content of the
> exhaust at idle.
>
> This discussion originated talking about Shannon's 16v and how he found a
> "dramatic" increase throughout the rpm range after adjusting the IDLE
> MIXTURE SCREW.....I believe with you and a test harness close at hand.
>
> So that would mean that the discussion should focus on CIS-E cars where
> 99.9% of the mixture is controlled by the Differential pressure regulator
> and the Oxygen Sensor circuit whenever the system is "off idle"
>
> As I do happen to be sitting here with my early cis bentley on hand and my
> Haynes (ack) covering all the fuel systems I feel I must speak first about
> the early cis system
>
> It is quite clear from the diagram in the Bentley that turning the IDLE
> mixture screw changes the position of the control plunger, allowing more
or
> less fuel to enter the system at idle.  Reason states that if this plunger
> moves, there should be a change throughout the rpm range dependent on the
> position of the airflow plate.  However, and you should all be digging out
> yer Bentleys by now because this is the most on topic thread on this list
in
> 6 months, you can clearly see that there is a large "notch" in the plunger
> that allows fuel to flow to the injectors when the metering plate is
lifted.
> Therefore, the miniscule amount that the idle mixture screw adjust the
> plunger at idle will be negated by the massive changes in position as the
> metering plate rises.
>
> Now, the basic function of the system is the same for CIS-E equipt cars.
> However, because this system incorporates the idle switch on the throttle
> body which lets the computer and then the DPR know when the system is at
> idle and the fact that the DPR operation off idle (and not at WOT) is
> controlled by the 02 circuit and the temp circuit, any changes to the
system
> are automatically adjusted for when the system is off idle.  It would
stand
> to reason that the idle mixture setting would have little to no effect on
> anything but idle.
>
> I'm not doubting that the changes the Shannon made to his system greatly
> improved drivability.  He stuffed in the 2.0 with a PP head and then went
> about adjusting the system.  Any number of things from a sticking idle
> switch on the TB to bad contacts on his temp circuit or fuel
> module......could have been shaken loose and began working at the same
time
> he cranked the shit outta that adjustment screw.
>
> It's all in fun guys, but if we are going to poke fun at each other and
make
> blanket statements, lets back them up with facts.
>
> Brian Honnold
> 78 2.0 16v Turbo (third engine swap and 4th fuel system going in)
> 99 Passat GLX
>
>
>
>
>
>
> > -----Original Message-----
> > From: owner-scirocco-l@scirocco.org
> > [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Chris DeLong
> > Sent: Friday, September 22, 2000 8:05 PM
> > To: bhonnold@pac-cap.com; scirocco-l@scirocco.org
> > Subject: RE: Snorkel boy (stirring the pot)
> >
> >
> >
> >
> > Ok dude I will tell you how I "KNOW".
> >
> > Although I do not have the Bentley in front of me that covers
> > MKII Scirocco
> > I do know that the structure and function of the fuel
> > distributor/air flow
> > plate assy does not change with CIS cars.
> >
> > In the Bentley manual that covers '80-'84 Rabbit/Jetta/Scirocco
> > on page 44
> > of the Fuel and exhaust systems there is a perfect explanation
> > and picture
> > of the geometry and function of the fuel distributor.
> >
> > Feast on that. :-P
>
>
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