Has anyone here done it?

For how long?

Any damage to the turbine impeller blades?

Yep, but not on a diesel. On a TT ~500ci gasser running a pair of T-04 .96ar 76GTS turbos.

The key to saving the compressor wheel is very VERY fine atomization of the water/meth and strategic nozzle placement. If you don't get a very even spray pattern and a VERY fine mist, it will tear the wheel up.

Done right the benefits are HUGE.

So... why not just inject post turbo? Are there benefits pre-turbo that just can't be obtained post turbo?

Is there any issue of having the water mist inside the intercooler?

So... why not just inject post turbo? Are there benefits pre-turbo that just can't be obtained post turbo?

Is there any issue of having the water mist inside the intercooler?

Pre-turbo injection makes the turbo more efficient. That means that if you're getting 10psi at 2000rpm, you'd get more.

If you have a small turbo, you don't have to upgrade to a larger one, you just improve the efficiency.

As far as i know, water mist in the intercooler is not good. But you're not going to inject load of water pre-turbo. The rest of the water can be injected after the intercooler.

On my car, a '92 Mercedes 190D with a 2.5 liter 5 cyl idi turboengine, I don't have an intercooler. I'm hoping water injection might make up for it + a 1gph nozzle for pre-turbo spraying.

Yes, there are huge flow/efficiency gains by injecting the water pre-compressor. You're basically using the evaporative cooling of the water to prevent any heating while being compressed, thus flowing a denser air charge through the compressor.

The mist is so fine, and a relatively low volume you would never get any water build up inside the IC.

I trust that I won't see anyone copy/sell this around here. Then again, you can't see the most important part so I guess it's not a big deal.
http://i26.photobucket.com/albums/c141/ohhhnoes/12.jpg

Wow this is very interesting I have a water meth kit that I haven't installed yet. :idea:

That thing is SWEET Rogue.

Wow this is very interesting I have a water meth kit that I haven't installed yet. :idea:

If you try to adapt a standard water/meth setup to inject pre-turbo, you'll destroy the compressor wheel in no time. They don't come anywhere close to the atomization needed to keep it alive.


Thanks Hut, will hopefully have some pics of a setup hidden on a TT Viper shortly. ;)

If you try to adapt a standard water/meth setup to inject pre-turbo, you'll destroy the compressor wheel in no time. They don't come anywhere close to the atomization needed to keep it alive.


Thanks Hut, will hopefully have some pics of a setup hidden on a TT Viper shortly. ;)

O wow... thanks for telling me. The kit I have has a 1gph nozzle so I was just thinking....:o: Already blew the new turbo up once, don't need it a second time!!!

Doing this will over time erode the compressor wheel.

Doing this will over time erode the compressor wheel.

Done properly, no it won't. Done much research on nozzle designs, fluidynamics, spray patterns, pumping pressures etc?

I've done it and proven it to work. Have you? If you're tearing up the wheel then you're not atomizing the liquid properly, aka, you failed.

Anytime you have water droplets no mater what the size moving across a surface you will have erosion. Yes you can combat this with smaller droplet size but it will still happen.

Anytime you have water droplets no mater what the size moving across a surface you will have erosion. Yes you can combat this with smaller droplet size but it will still happen.

Remember what I said about "fluidynamics"... well you see, anytime you have airflow there is what is called a boundary layer. On a car, this can be as much as an inch thick across the surface of the leading edge of the hood, frontal area, etc. In this "layer" the air is virtually still and is in sorts a buffer over the vehicle. Thus why if you watch wind tunnel testing with the smoke stream, it never ever comes in contact with the vehicle. :idea:

Thus, if you atomize the droplets correctly, and thus they vaporize quickly, they will never come in contact with the compressor wheel. This is one of the tell tale signs that you "got it right"... there is no visible change in the compressor wheel after pumping gallons upon gallons of fluid through it.

Remember what I said about "fluidynamics"... well you see, anytime you have airflow there is what is called a boundary layer. On a car, this can be as much as an inch thick across the surface of the leading edge of the hood, frontal area, etc. In this "layer" the air is virtually still and is in sorts a buffer over the vehicle. Thus why if you watch wind tunnel testing with the smoke stream, it never ever comes in contact with the vehicle. :idea:

Thus, if you atomize the droplets correctly, and thus they vaporize quickly, they will never come in contact with the compressor wheel. This is one of the tell tale signs that you "got it right"... there is no visible change in the compressor wheel after pumping gallons upon gallons of fluid through it.
ROGUESTS, this is very interesting. Perhaps you can share your knowledge with us as I would be very interested in running a setup like you describe.

Thanks!

Yes, there are huge flow/efficiency gains by injecting the water pre-compressor. You're basically using the evaporative cooling of the water to prevent any heating while being compressed, thus flowing a denser air charge through the compressor.

The mist is so fine, and a relatively low volume you would never get any water build up inside the IC.

I trust that I won't see anyone copy/sell this around here. Then again, you can't see the most important part so I guess it's not a big deal.
http://i26.photobucket.com/albums/c141/ohhhnoes/12.jpg

That looks like the aquamist part. Am I mistaken?

I'd be more worried about the nozzle coming loose and going through the compressor wheel than erosion personally...

I've also seen people try to inject too much fluid too soon and the drag on the compressor wheels increases so much that boost begins to drop.

I would think the main concern would be thermal shock to the turbine...sounds like a recipe for disaster to me. Also how would you inject the water into the manifold or uppipes without it boiling before it enters the gas stream? You would have a nozzle connected to the manifold/uppipe and it would be conducting a serious amount of heat to the water source. There would need to be some type of buffer to not allow the water to be superheated before entering the exhaust gas.