Hey guys,

Stumbled across a whole subculture on the forum talking about water injection.

I've got absolutely no idea what they are doing, but it seems pretty interesting.

Is anyone able to give me the cliff notes and let me know if it's something that should be investigated further?

Edited August 2, 201412 yr by Rab

Long story short

Yes

It's brilliant

My Christmas present is a water injection kit

Essentially

Highly vaporized water goes in (nozzle can be pre or post turbo) lowers IAT, raises octane. So more boost, more spark and a cleaner engine.

It's just brilliant

So needs to be tuned for it?

Is it something that can be on or off or is it a full time commitment?

Windscreen wiper size bottle you need to keep full all the time or a 50l tank?

Does it work with LPG?

Remember - this is for dummies

haha

For the full advantages

Yes it will need to be tuned. you can add spark but ill be just removing some fuel

I want it for having a 91 E10 tune. With water injection it'll behave similar/better than 98.

Yes it will work on lpg

Remember Rab

Questions are good, Questions means thought and questions means learning

In a piston engine, the initial injection of water cools the fuel-air mixture significantly which increases its density and hence the amount of mixture that enters the cylinder. The water (if in small liquid droplets) may absorb heat (and lower the pressure) as the charge is compressed, thus reducing compression work.^[1] An additional effect comes later during combustion when the water absorbs large amounts of heat as it vaporizes, reducing peak temperature and resultant NO_x formation, and reducing the amount of heat energy absorbed into the cylinder walls. This also converts part of combustion energy from the form of heat to the form of pressure. As the water droplets vaporize by absorbing heat, they turn to high pressure steam. The net result is a higher octane charge that will support very high compression ratios or significant forced induction pressures before onset of detonation.

Wikipedia does a pretty good job of explaining it

great info , Matty

If and when I get the wife's FG tuned then the water meth route will be something I'll be looking into.

I'll be doing it for similar reasons to MattyP , running E10 94 and a safe tune!

Ok that's all the good stuff, what disadvantages or possible issues can it present.

Besides one more thing to go wrong and another tank to fill , I don't think there are any real disadvantages provided it's set up correctly!

These systems have been around for about as long as the internal combustion engine has, so they should be relatively reliable.

Their operation is pretty simple.

I seriously looked at a water meth system about 20 years ago when I was running a high compression cleveland but after a camshaft change (more duration) solved some of my issues.

A lot of people frown upon them as a "bandaid "solution but they do have merit IMHO !

Would be interesting to see what gains can be made on a stock car with a tune given it's relatively cheap to set up compared to new cooler ect.