[s-cars] Air to Liquid Intercoolers - Comments??

[Kenneth Hayes]

my random thoughts

you could build a secondary system that was a liquid loop that went through
a newly designed intercooler that utilized the liquid as a coolant for the
turbo air, but you'd have to cool that secondary system with another heat
exchanger that was air to liquid.  liquid is much more difficult to cool
even though water is a great moderator which means I agree with your
supposition on size.  It'd have to be much bigger to do an equivalent amount
of cooling, but the consistency would be there.

so if we jumped to purpose built race cars why aren't they doing something
like this?  not much gain for the effort maybe.  But how about an electric
a/c pump & system (closed loop) that keeps the setup air to air and utilized
an a/c type system to standardize the temp of the heat exchange?  this could
be used down stream of the normal intercooler to allow the normal crossflow
of air to cool the turbo air then further cool it by the second heat
exchanger.  Not only bringing the temp down, but also standardizing the
temp.  So why aren't they doing this in purpose built race cars?

Ken



-----Original Message-----
From: s-car-list-admin at audifans.com [mailto:s-car-list-admin at audifans.com]On
Behalf Of Lewis, Gary M
Sent: Friday, September 12, 2003 12:19 PM
To: s-car-list at audifans.com
Subject: [s-cars] Air to Liquid Intercoolers - Comments??

No one seems to talk about them on-list.  Seems like a great way to dial in
boost/timing maps when intake temps are nearly certain, or at least in a
tight range.

My suppostitions...

Downsides:
Weight  - gotta add water and pipes
Space/Package  - gotta be bigger than a air to air intercooler
Throughput  - I'd think with the bigger packaging, you are sacrificing some
IC size, and size equals density

Upsides
Packaging  - "But you just said..."  Yeah, but these keep the air cooler
than the same size air to air.  If you can put in the same size core, you
should have more density.
Air Temp Certainty  - Should make software programming easier

And of course, the twist.  Use an air to air intercoler, then water inject.
I believe this is the best solution.  I nearly did this on the 200 TQA, but
I found (and bought) the S6 TQA

Comments welcome...

Gary Lewis

1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust Manifold, RS2 Injectors,
Custom Turbo (K26 Turbine, Factory K26 Cold side (Audi Works '999' P/N) with
50mm intake and custom Innovative Turbo compressor wheel), Bilsteins,
Eibachs, Big Reds.

1990 200TQW, K24 Turbo, 1991 TQ Intercooler, 1.8 bar, Bypass Valve, Euro's,
Bilsteins, Redline in tranny and diffs, FOR SALE


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