[Diy_efi] Argon turbo assist.

[Grant Beaty]

> Injecting water into the exhaust upstream of the turbine has the
equivalent
> effect of a temporarily smaller A/R ratio turbine housing.

Very interesting... Is there any info online somewhere about this? In the
achives? (I've searched, but the problem with the achives is that most
posts' subject matter deviate from their subject quite a bit, much like this
one).

I take it water injection also has the same effect? Or almost anything that
will vaporize?

Thanks,
Grant Beaty

----- Original Message -----
From: "Greg Hermann" <bearbvd at mindspring.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, December 27, 2002 3:02 PM
Subject: Re: [Diy_efi] Argon turbo assist.


> At 4:11 PM 12/27/02, William Shurvinton wrote:
> >Water expands when vapourised. This does lower temps a little, but the
> >increased velocity/mass flow rate more than makes up for it.
> >
> >Better minds than mine have done the sums  and they do stack up.
>
> Injecting water into the exhaust upstream of the turbine has the
equivalent
> effect of a temporarily smaller A/R ratio turbine housing. It will
> definitely speed up spooling, at the cost of some additional backpressure
> on the motor. That this is true is WELL proven (in the real world, not
just
> in calculations) in a number of tractor pulling diesels !! (Which have
been
> known to use _FAR_ larger, slower spooling  turbos than what are found on
> (most) cars !!)
>
> Ideally, one wants to mooodulate (reduce) the water flow as the turbine
> speed picks up, and shut the water off completely once the turbine is
> operating in the range where the nozzle is the ideal size. At that point,
> the H2O in the exhaust would be detrimental to performance.
>
> Greg
> .
> >----- Original Message -----
> >From: "Grant Beaty" <gbeaty at ufl.edu>
> >To: <diy_efi at diy-efi.org>
> >Sent: Friday, December 27, 2002 9:47 PM
> >Subject: Re: [Diy_efi] Argon turbo assist.
> >
> >
> >> The water would increase the mass, but lower the temp and velocity.
Isn't
> >> velocity more important?
>
>
>
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>



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