For the people that are running turbo charged engines with intercoolers ie Vrs.

This is a mod that the Audi S4 b5 2.7 V6 twin turbo guys used to do, to give them just a bit more power when caining the car into Intercooler heat saturation.

get a set of washer nozels and place them in front of the intercoolers, to give a nice overal spray into the matrix.

use another water bottle and pump from anything you can find/fit.

also fit a switch in the dash use a spare slot.

hey presto water cooled intercooler on the cheap, and it works!

the downside you can get through a lot of water

Yes mate - done it- used an intelligent autospeed setup (DIY solder kit from an Aussie company called Jaycar electronics) and the headlight washer pump/bigger bottle. Only fires water mist when both IC temps above ambient by 10 deg and you are above 3,000 rpm (both levels adjustable) . The water mist drops temps approx 12 deg with the OEM SMIC, compared to my Forge FMIC which drops them about 30 deg.

Have to use a fine mist nozzle to maximise temp drop, it's about how fine the spray is, not how many GPH you can flow..

As a note, the above Jaycar kit works fine with petrol engines - for diesel ones, you have to get a MAF flow sensor kit or tachometer kit from the same people to tell when you're booting it - Diesel signals are different.

I've also got a kit, but from a different company and not quite so advanced...

Mine has a 10 second timer and three jets. It seems to work well in the summer.

There's a lot of good stuff at Jaycar Electronics, not just for cars. They supply complete kits containing instructions, circuit boards and quality components. If you know which end of a soldering iron to hold, lots of nice relaxing evening projects - everything from a turbo timer, tachometer triggered relay, MAF flow triggered relay, intelligent waterspray controller, fuel richness monitors, etc. Pretty cheap too. Only compaint is that they don't respond to emails after you place the order, silly so-and-so's.

Worth a look.