WClark

Has anyone with an A4 installed an intercooler water spray? They are quite common on rally prepared turbo Subaru. I know they are banned on most race tracks but for the street A4 I would guess they would do a nice job of keeping peak air inlet temps down either automatically or on driver demand.

nwong

Are you saying spray water on the outside of the air-to-air intercooler to reduce inlet temps? How cold does the water need to be to provide a significant decrease in air inlet temps?
I've heard of using water injection to curve detonation as a heat soak, but that's distilled water injected into the intake manifold.

CARYB

and very flammable!!!<p>CaryB, '99 1.8T
<img SRC="http://pictureposter.audiworld.com/AudiWorldPics/2000/Audi-Signature-3.jpg

nwong

I've also heard this and the results can be catastrophic if used incorrectly. I've noticed a lot of drag racers spary the outside of there intercoolers with nitrous/compressed CO2 (anything cold) prior to launch to get that extra edge.

Wedge

Yes, some rally cars have used such a system; they top off the water tanks between special stages. So has aircraft (the P-51, F8F, Sea Fury, to name a few) racing in the unlimited classes at the Reno Air Races (but they use a water spray bar system on radiators for aerodynamic reasons). The idea is to use water in addition to air to remove heat from the intake charge via the intercooler. Thus, improving the ability of the intercooler to lower the temperture of the intake charge. It would work in theory, but how well I wonder...

adc

The water itself is held in a plastic container, similar to the one for the windshield washer (maybe it's the same one . It doesn't have to be cold in itself.

I'm not an expert, but that's my understanding.

adc

berkel

Hello,

I have a Nitrous Oxide kit in my 95 GSR sedan...

First, the gas is Nitrous Oxide or N20. NOS is a brand, like Qtips.

N20 is NOT FLAMMABLE. I repeat, it is NOT FLAMMABLE. N20 is an oxidizer, it adds O2 to the combustion process. It also greatly cools the intake charge.

However, it is not to be taken lightly. Anytime you have a compressed gas, you need to be careful. On top of this, you have to be very careful to use it with your car to avoid breaking things: Enough fuel, very good ignition, colder plugs, retarded timing, forged pistons, etc. etc. Not for the faint of heart or careless. I was fairly careful and still managed to burn a valve in my GSR.

The cases people have seen where someone "blew up" their car with N20, such as the infamous Nissan Maxima incident, are due to user error/stupidity... In that instance, the brilliant guy decided to keep the bottle heater on (increases pressure so get more HP) ALL the time. This still would have been ok, although not ideal, since there is a "dump tube" to release contents if pressure gets too high. However, the guy also decided to plug up that tube. The results were ugly, like something Wil E. Coyote would have tried with an ACME explosive...

BTW, just because N20 isn't flammable, it could still cause problems if, for example, your car caught on fire. It is very efficient and cooling the intake charge though. Remember PV=nRT...

FB<ul><li><a href="http://members.tripod.com/DecalFree/DFH.html">DFH~Decal Free Hondas Website</a></li></ul>

CARYB

<p>CaryB, '99 1.8T
<a href="http://131.107.68.28/a4.org/registry/details.asp?car=2176">
<img SRC="http://pictureposter.audiworld.com/AudiWorldPics/2000/Audi-Signature-3.jpg" BORDER=0></a>
Click on image for my registry.

Raoul

Come stock on Mitsubishi Lancer Evo 6 (2.0 liter turbo, 0-60 4.4 sec)

jasyn³

not that i know of .. but i've been thinking the same thing for past few weeks. shouldnt be dat hard