[Diy_efi] Argon turbo assist.

[Greg Hermann]

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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