[s-cars] Alternatives to RS2 Injectors - related Q

[Calvin & Diana Craig]

Maybe I am wrong here but if this is having to do with the trip computer,
doesn't the trip computer just get a signal from the ECU representing
injector duty cycle and then calculate mpg?  If this is the case then
changing the chips in the ECU that control the fuel curve would not affect
what the trip computer "thinks" the injector size is, i.e. stock.  I am just
speculating here but this is my guess.  mYou certainly didn't get a 20&
increase in fuel economy, that would violate one of the fundamental laws of
physics, the Conservation of Misery.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Mark Strangways
Sent: Monday, February 23, 2004 3:06 PM
To: otw185; s-car-list at audifans.com
Subject: Re: [s-cars] Alternatives to RS2 Injectors - related Q


You show better gas mileage because the ECU is using a shorter duty cycle
with the larger injectors.
Since you have not had your injector size value in the ecu changed (Mihnea
enter here) your ecu is calculating the fuel economy based on what it thinks
the injector size, and it's duty cycle. So it feels as if it is not nearly
burning the same amount of fuel.

What to do ?
a) Talk to Mihnea about setting your injector size into the software,
or
b) Enjoy the illusion that your getting really good fuel economy.

Fill the tank, reset the tripometer, and log how many miles you get to that
tank. Then calculate the real fuel economy

Mark S
----- Original Message -----
From: "otw185" <otw185 at yahoo.com>
To: <s-car-list at audifans.com>
Sent: Monday, February 23, 2004 11:16 AM
Subject: [s-cars] Alternatives to RS2 Injectors - related Q


> I forgot to mention I did indeed change to new timing
> and boost chips created with this in mind when making
> the injectors/cam change as well.  Still surprise to
> see significant fuel economy improvement....
>
>
>
> Message: 9
> Date: Mon, 23 Feb 2004 06:47:49 -0800 (PST)
> From: otw185 <otw185 at yahoo.com>
> Subject: [s-cars] Alternatives to RS2 Injectors -
> related Q
> To: s-car-list at audifans.com
> Message-ID:
> <20040223144749.74921.qmail at web41211.mail.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> The talk of injectors has reminded me about an
> observation of mine.
>
> About a month ago I switched to 37#/hr. injectors and
> somehow my (92's) computer is telling me I'm now
> getting avg. MPG of about 21.5.  In the past with
> stock injectors and RS2 turbo, I was seeing more like
> about 17 all-around MPG.  All other factors are more
> or less constant except I also switched out the
> exhaust cam to a 7A type at the same time.
>
> Any explanation for why I'm showing better fuel
> economy given I should be burning more fuel with the
> larger injectors -- or is it a calibration issue with
> the Motronic ?  I haven't yet just calculated my
> mileage by actual fuel volume used vs. miles which I
> keep forgetting to do.
>
> Scott S.
> Columbus, O
>
>
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