Hi we have a 52 sti with waterspray. We only use it on the road. What I`d like to know having never tried it does the waterspray make a noticeable difference when used.
When I bought the car there was like white water marks over the engine I cleaned the engine bay and the marks have never returned was this residue from the waterspray?
If you use it is it possible to over use it?
Any advice on this feature of the car would be appreciated

 

The waterspray cools the air in the intercooler making it more dense, that in turn means you get more power, so yes it does do something and those white marks, chances are that they are chlorine in the water.

Tony

 

buuut....probably not a noticable difference in performance. certainly doesnt seem to be one on my bros evo anyway. my scoob doesnt have a spray.

 

Your brother has a front mounted intercooler, it has the maximum ammount of air flow available to it, the Subaru on the other hand uses the top mounted intercooler, this doesnt quite get as much air across it, so they use the water spray on the STI's, it does improve performance, by how much? 5-10bhp? who knows, so if your car isnt a new age or an RA or type R STI,then the chances are that it wont have it fitted.

Tony

 

Thanks Tony next question is the amount of performance gain worth the pain of cleaning up the white marks.
Or if I use filtered or boiled water ( after it`s cooled down of course ) or deionised water would that prevent the white marks anybody any advice.
We don`t use the car everyday so experimenting could be a long process any wise owls out there who have been there got the t shirt so to speak.

 

I thought you were only meant to use deionised water
I'm sure it says that on the cap of the bottle.

 

Sorry to do a holy hijack here, but would waterspray be worth fitting to a standard UK Turbo? is it boost activated or manually pumped via switch on the dashboard?

Cheers!

 

Hi mate I think on the uk STI its operated by a manual switch and jdm on boost.
There is a kit that you can fit so it works on boost I think its about £140

 

Hi Greatgonzo I`ll have to check out the handbook I just thought people on here would know what`s best to use as experience is often better than print.
And yes my Uk sti has a manual switch not sure if pressing it emits water just while it`s pressed or whether it`s a timed affair.

 

Im pretty sure the later EVO have waterspray as well.

Gains probably 1 or 2 %