help with activating water injection valve

[jbod]

I am trying to figure out how to use the water injection on my gtfour.. There is a valve that supposidly governs the water supply to the engine, in my project thread the last two post explain it, the second to last post is how i suspected it worked from what i was told, and the last post is how i now think it works and still not having luck . Please have a read and add your 2c worth as to how to get this valve to function
viewtopic.php?p=898281#898281

[gt4dude]

pic so we dont have to swap threads



ok my impression from looking at the picture, that looks like a FPR on a miniature fuel rail, the banjo being the feed for the single injector. the boost feed to the fuel reg possibly giving it a 1:1 rising rate.

i heard somewhere along the way alot of those wrc things are blocked off and require some drilling.

im interested to know, if these things are catered for in the factory loom, where the other ends of the wires go...

[jbod]

I'm told that the water recirculates from the pump through the two fittings in the middle of the assembly and boost is used to push a piston or watever in that regulator to close off one of the middle inlet fittings so the water is then forced to over come the ball and spring valve on the other end and thus go into the engine. Altho if I try pump water into it the water goes no were. It can barely overcome the ball and spring valve,...just dribbles past at the best.

Hmm maybe the regulator works on vacuum and the water is meant to always overcome the valve and the injector in the plenum spray it when necessary . Then when u let off boost the vacuum pulls back the piston or watever in the regulator allowing water to go through the Other fitting recirculating into the tank.. Hmm idk, my initial though of working on boost may be more right? Idk possibly should try on another one of my valves see what results I get

[gt4dude]

where u gonna find a source of vacuum when the water is actually helpful ? (under boost)

find p/n for valve ask Mark?

maybe it's just seized and corroded, can you dismantle that thing and clean it out with crc?

[DeeCee]

The water injection is a dummy system, much like the anti lag system, that was only put there for homologation purposes. It's not suppose to work as far as I know.

[XS1V]

The water injection is a dummy system, much like the anti lag system, that was only put there for homologation purposes. It's not suppose to work as far as I know.

It works but you need to enable the valve etc (open it up and get it working) and have the electronics to have it work which you will need an aftermarket ECU to do (could do it with pressure switches but wont ever work too well.

Brad

[DeeCee]

And there lay the issues - hence why its not suppose to work.
Do you know if anyone has actually documented a working water injection system? I know that Redmist had got it working from what I remember.

[jbod]

I don't think dummy is the word, " difficult to get working" yes, brad you've got the antilag going from memory? I will use a cylinder leak down tester to apply some pressure to see if it opens up, I have 3 of the valve assemblies and two of them appeared blocked when water is pumped through.hmmmm they are not corroded or anything they are shinny and like new on the inside. Looks like it's not worth the hassle tho I'd like to figure the valve out it's very interesting. Alternatively you can buy those aquamist systems they're suppost to be the bussines

[RedMist]

I know that Redmist had got it working from what I remember.

Nope, dumped it and went large external tank, and aquamist. The stock injector isn't reliable in terms flow or atomisation and the small tank in the engine bay was simply a header for the 20l in the back of the WRC rally cars (which they burned through every stage)
If you do manage to free up a 18 year old injector that has never fired and then maintain pressure to it you'll need a huge amount of intelligence to drive it and a good deal of well filtered water to keep that large injector fed.

However I believe your assumptions are correct. The basic research we did on the WRC water injection, prior to dumping it, pointed to it replicating a fuel system. Tank, pump, injector, regulator, return.