[91TB78]

Headers

Can anyone help me out with this one?

What exactly is water injection?
Is it important/worth the money?
Does it add any power?

Are there any drawbacks?

 

[turbobuick]

It's not exactly water injection. It sprays the top of the intercooler from the outside to cool down the intercooler and the air travelling through it. As i'm sure you know, the colder the air moving through a turbo motor, the more power it makes. The advantage of it is more power through colder air and suppression of detonation.

 

[prost893]

If you are talking about the STi intercooler than you have your answer. If you are talking about real water injection, not just spray, then you might find some useful information here

http://www.aquamist.co.uk/

 

[jbhebert]

I think 91TB78 was refering to something other than the intercooler sprayer. There are systems that actually inject water into the combustion chamber. 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.
A similar system was used on P-51 Mustangs using alchohol instead of water, since at higher altitudes the water would freeze. That's the only drawback I can think of.

Hope that helps.

 

[91TB78]

I think 91TB78 was refering to something other than the intercooler sprayer. There are systems that actually inject water into the combustion chamber.

Exactly. Thanks guys. So, basically, this is just for highly powered forced induction cars and not something a stock car could benefit from?

 

[jbhebert]

It's something to combat detonation, which a stock car running correct gas shouldn't have a problem with. As you turn up the boost and/or advance the timing on a modified car, it becomes something that you may want to consider.

 

[turbobuick]

Oops, my bad, wrong topic. But yeah, in the turbobuick world we either run denatured alcohol or the new thing is propane injection. You keep it a resevior and set it to come on at say 10 lbs. of boost. There is a line that runs up to the throttle body that sprays a constant mist. You can tune your car with your race chip and race gas, and then go back to pump gas keeping the alcohol setup. Its great at suppressing detonation since those cars have about a 17lb limit on pump gas. It's nice running 22lbs on the street with 93 octane

 

[JJ]

Moving this to STi Power...

 

[yxan2]

okie, how many showers can u do with one tank of water? and where is the shower button located?

 

[jbhebert]

Not sure how many sprays you get on a tank. Probably quite a few, as it's just a misting. The tank looks to be around 2 liters. The button is located on the dash to the left near the foglight switch and cruise control switch.

 

[yxan2]

okie so then i think ive seen what looks like the water sprayer button, cool thanks

 

[m ben]

Not sure how many sprays you get on a tank. Probably quite a few, as it's just a misting. The tank looks to be around 2 liters.

I believe the trunk-mounted tank is around a gallon/4 liters. in earlier (prior to bugeye) STi's the tank was mounted in the front corner of the engine bay & was something like 3.7l IIRC.

the Spec-C tank is a full 12 liters, which sounds much better to me, esp for extended use on the track



Ben

 

[yxan2]

would be cool if the regular STi sprayer would be 12 liters, if not wonder how hard it would be to updgrade to a spec C water tank.