Location: ...

For water spray, there's a very neat way to do it.  An outfit called
Labtronics, in Adelaide South Australia, has a microprocessor controlled
spray unit.  It's called the Autospeed / Labtronics Intelligent Intercooler
Water Spray.

It's a very well done unit that monitors ambient temperature and
intercooler temperature on the BACK of the intercooler, and knows
when you've got a load on the engine by watching the duty cycle
of an injector.  Both load and temperature sensitivity are adjustable
so it can figure when to close a relay controlling a water spray pump.
This really helps conserve whatever fluid you are using.

There's an article about it here:

It seems to me that this was around $100US by the time it was shipped here.
You can email labtron@chariot.net.au or spary@labtron.com.au for more info.

And if you are going this way, I'd highly recommend the Davtron Intercooler
Temperature Gauge.  It shows before / after / differential temperatures
via thermocouples in the intercooler.  An address is:

You will have to call and ask for the intercooler differential temperature
gauge, it's not listed on the web page.  Try (650) 369-1188 or email
to davtron@aol.com  As I recall, this was about $150 and it's not always
in stock, you may have to wait until they produce a batch.

    - Charlie

- Charlie Smith Top of Charlie's Audi home page
Mail to Charlie