[s-cars] water injection

[Philip Mische]

I was addressing only impeller erosion - my early experience water & fuel
injection involved cars without intercooling.

For maximum cooling it's always all about where you get the highest
temperature drop and therefore the highest heat transfer; water injection is
like another heat exchanger in series with the intercooler.  Which has the
capacity to exchange more heat?  Put that one first, then take what you get
with the second one.  And if you do add water to the air first, some of it
will likely revert back to liquid as the charge cools in the intercooler.

----- Original Message -----
From: "Trevor rice" <trevorricetemp at hotmail.com>
To: <s-car-list at audifans.com>
Sent: Monday, October 25, 2004 12:30 PM
Subject: Re: [s-cars] water injection


> Not sure if anyone's mentioned it yet, but yes you will see benefits in
> cooler charge temps & cooler running of the turbo by injecting before the
> turbo. However you will also coat the internals of your intercooler with
> water, thus reducing its efficiency. Whether the benefits outway the
> drawbacks?? I dunno.
>
> The recomended practice is to place the injector as far from the throttle
> body & plenum as possible but after the intercooler.
>
>
> From: "Philip Mische" <pmische at comcast.net>
> To: <s-car-list at audifans.com>
> Subject: Re: [s-cars] water injection
> Date: Mon, 25 Oct 2004 08:04:49 -0400
>
> I have some experience with regard to the question about whether it's ok
to
> put the water injection nozzle ahead of the turbo.  In my misspent youth I
> worked for a shop that did a lot of turbo development work.  We designed &
> manufactured a separate supplementary fuel system which we also used for
> water/methanol injection.  The supplemental injectors were (gasp) ahead of
> the turbo - we never saw any excess wear on impeller blades.
>
> And don't forget that back in the very old times, before fuel injection
> ruled the earth, carburetors (remember them?) were more often than not out
> ahead of the turbo, drawing the fuel and air right past the impeller...
>
> Phil
>
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