Differential Pressure Regulator - just the facts

[Ben Swann]

Brady,

I'm not trying to support what was written in the Factory Service manual,
nor refute anything you are saying.  In other words - I don't know, and can
only speculate.

Ben
----- Original Message ----- 
From: "Brady Moffatt" <bradym at sympatico.ca>
To: "Ben Swann" <benswann at comcast.net>; "Marc Boucher"
<mboucher70 at hotmail.com>
Cc: <antar at comcast.net>; <suffolkD at aol.com>; <quattro at audifans.com>
Sent: Tuesday, February 03, 2004 10:34 AM
Subject: RE: Differential Pressure Regulator - just the facts


> Hi Ben/All,
>
> Obviously, the CISE and CISE3 DPR's are physically similar. I can't see
how
> they can be functionally identical though. The ECU can't tell the
> difference, but how is it supposed to compensate when it thinks it's
aiming
> for 10mA if it should really be aiming for 0mA.
>
> The nominal adjusting point you refer to is essentially the position of
the
> metal film in the DPR at that amperage (right?). CISE requires 10mA to get
> the film to the point where it allows the same amount of fuel to flow past
> as the CISE3 would at 0mA.
>
> How can this be the same?
>
> Cheers,
> Brady
>
> -----Original Message-----
> From: Ben Swann [mailto:benswann at comcast.net]
>
> Brady,
>
> I am only reporting what is printed in a factory  Audi Service Training
> manual for CIS-E3/2.3l
> engines.  I think the part no. changes more to reflect year rather than
> actual major differences in the part.  I found one cis-e DPR with the same
> part no. as on the CIS-EIII's I checked.
>
> Here is what the manual says. "The regulator and its operation is the same
> as used on CIS-E fuel injection.  The operating range during closed loop
or
> oxygen sensor regulation has, however, been changed.  The operating range
is
> now +10mA to -10mA.  The nominal CO adjusting point is now 0mA.  This
helps
> to insure better engine operation if an electrical failure should occur by
> providing a fuel mixture which is in the range of the nominal setting."
>
> I did check resistance for several(6), incl. cis-e, cis-e3and resistance
> typically between 18 and 22 ohm.
>
> Just reporting my findings - you may interpret them as you like.
>
> Ben
>
>