As I am new to Scooby`s, can someone expain to me what the Water injection actualy does, and how and when it should be used. Cheers

 

bttt

 

On the rally cars the ECU senses air temperature after the intercooler and turns on the water spray when the sensible cooling of the evaporating water on the outside of the cooler would be beneficial by reducing the air temperature inside the intercooler thus increasing the density of the air feeding the cylinders, adding more oxygen thus allowing the addition of more fuel to liberate more power.

On the road car the water spray allows you to boast down the pub that you have an intercooler water spray. The only time it would be of benefit is when you're on full boost struggling for grip with lots of things to worry about. At this point pushing the water spray button is the last thing to worry about.

But the rally car isn't allowed water spray unless the road car has it so the road car has it.

So on a road car it's bollocks.

It's called homologation.

 

"Intercooler water spray" and "In-Cylinder water injection" are 2 different things. Which one are you asking about?

 

Thanks for that chelspeed.

sorry it is the waterspray that i mean

 

so for the benefit of the rest of us what is "In-Cylinder water injection" all about then please ??

 

Check out http://www.aquamist.co.uk/ for a good explantion on water injection.

 

Taken from the Aquamist link above:

The main function of these systems
is to suppress detonation caused by
high temperature and pressure developed
within the combustion chamber when
the effective compression ratio has
been taken beyond the auto-ignition point
by either a turbo or a supercharger.
Water, with its high latent heat content,
is extremely effective for controlling
not only the onset of detonation but also the
production of oxides of nitrogen in
the modern leanburn engines.


Iain.