water injection question

[Jim Green]

B writes;

> Be prepared to buy a new exhaust with regular
> frequency; high 
> temperature steam is extremely corrosive.  Also, you
> need to use 
> rather pure water or you can expect a lot of mineral
> buildup in all 
> the wrong places, and it's a LOT harder to get off
> than carbon 
> deposits and such.  You will get fantastically clean
> exhaust valves 
> and combustion chambers though!

No worries here, use washer fluid, 50% distilled
water, 50% methanol.  Works perfect.  If your worried
about your exhaust you might as well never start your
car.  All that crap that comes out in the morning is
what you need to worry about, not the occasional WOT
blast on a boiling hot exhaust.  I use about 1 gallon
for every three tanks of gas.

> Also, you need to make absolutely sure you don't
> have any drips/leaks 
> when the engine is shut off, or you will have a very
> nasty surprise 
> next time you go to start it up!  Another problem is
> condensation; if 
> it's not finely sprayed enough, it'll condense on
> the walls of the 
> intake system and pool somewhere.  

Those are valid points, and why you need a solenoid in
the mix, and why not to ever use the Spearco system.

> Freezing is
> another consideration, 
> so now you need to add something to the water to
> keep it from 
> freezing.

All weather washer fluid, good for -20, you arctic
folks might need a little extra help.

> >With WI, you
> >could probably increase the boost without getting
> into
> >knock, then you wouln't be in the dangerouse
> situation
> >of having your knock sensor control your timing for
> you.
> 
> Proper engine management doesn't use knock sensors
> to "control" 
> timing nor boost.  It is only designed to prevent
> engine damage; a 
> very important distinction there.

Just like I said, but how many hacked type 44's are
running around out there with no timing re-mapping? 
Tons, the only way they're staying out of knock is
because the ECU is probably pulling timing from some
small knock counts that no one ever notices.  By using
WI, the ECU may never see any hits and will think
everything is normal which equals good power.

 
> I believe Corky Bell's book states that "a properly
> designed 
> turbocharger system does not require water
> injection".  I got the 
> distinct impression he considered it a hack.  Could
> have him confused 
> with someone else though.

True, but a properly designed turbo system doesn't
look like the one in a 5ktq, but more like one in a
20vt....

Later,

=====
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html

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