[s-cars] RS2 Injectors

[Calvin & Diana Craig]

Mihnea,

I don't understand the "can't say too much" thing.  I guess I thought the
whole point of the list was so people could learn from each other and save
each other the time and effort of re-inventing the wheel, so to speak.

--Calvin


-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Mihnea Cotet
Sent: Friday, June 27, 2003 5:12 PM
To: Russ Panneton; Mark Strangways
Cc: Christopher Gharibo; * S List
Subject: Re: [s-cars] RS2 Injectors


Hi guys,


I can't say too much here because there are too many eyes open that
shouldn't read that but during part throttle the ECU uses direct feedback
from the O2 sensor in order to have a clean mixture, however that mixture
depends on the programming. At WOT, the ECU still uses feedback from the O2
sensor but differently and at different cyclings, meaning that it doesn't
adjust the mixture as it does in "closed loop".. Actually, closed and open
loop are pretty much BS IMHO, it's more like part and full throttle and 2
different ways of interpreting the O2 sensor output but too few people know
that and I'd can't say too much either.

Anyway, RS2 injectors run a lot better with chips programmed accordingly,
when run on stock chips they can run pretty fine under part throttle but
the mixture will be way too rich at WOT.


HTH,

Mihnea


At 12:58 27/06/2003 -0600, Russ Panneton wrote:
>--
>[ Picked text/plain from multipart/alternative ]
>Mark,
>
>In light throttle cruise, I believe our cars run closed loop and the ECU
>will eventually trim the A/F ratio to something clean at the tailpipe.
>  But I also bet it runs open loop when the HP demand goes up because our
>"narrow band" O2 sensors don't indicate usefully when the mixture gets
>rich enough to produce good power.  Once the ECU goes open loop, all the
>parameters better be correctly matched or else.  What I continue to
>wonder is if the ECU "trim" values it adaptively computes are applied
>during open loop operation?
>
>Russ
>
>Mark Strangways wrote:
>
> >This brings me to another question then.
> >Do our ecu's not adjust the duty cycle of the injectors based on a closed
> >loop feedback from the O2 sensor ?
> >Should then the ecu not be able to compensate for the different CC's of
the
> >injectors ? Provided of course that it doesn't force the duty cycle outta
> >range and throw errors.
> >The whole concept of a computer control and all these sensor is to give
the
> >engine some intelligence, or does it just follow lookup maps ?
> >
> >Mark S
> >----- Original Message -----
> >From: "Mihnea Cotet" <mik at info.fundp.ac.be>
> >To: "Christopher Gharibo" <cgharibo at usa.net>; "* S List"
> ><s-car-list at audifans.com>
> >Sent: Friday, June 27, 2003 7:04 AM
> >Subject: Re: [s-cars] RS2 Injectors
> >
> >
> >
> >
> >>Chris,
> >>
> >>The RS2 injectors don't have any disadvantages other than the fact that
> >>you'll need to have your ECU rechipped in order to take advantage of
them
> >>and of the RS2 turbo. They are a direct replacement. Depending on what
> >>
> >>
> >else
> >
> >
> >>you install in your car along with your RS2 turbo, you can have up to
380
> >>HP, but the RS2 injectors aren't really necessary before 350...
> >>
> >>
> >>HTH,
> >>
> >>Mihnea
> >>
> >>At 06:52 27/06/2003 -0400, Christopher Gharibo wrote:
> >>
> >>
> >>>I have Stage I upgrade on my S6 and may go for RS2 turbo in the future.
> >>>
> >>>What are the performance improvements and disadvantages of RS2
injectors?
> >>>
> >>>
> >Are
> >
> >
> >>>these injectors a direct replacement?
> >>>
> >>>Thanks,
> >>>Chris
> >>>
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