[s-cars] RS2 Injectors

[Russ Panneton]

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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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