If you have the 2d kit up and running I was wondering what water injector size you are using? Also what fuel injectors are you using?

I am running 550 primary and 1600 secondary fuel injectors.

I have choices of .5, .6, .7, .8 and .9 mm water injectors.

Thanx,

Ken

 

not an answer to your question, but here is a an idea.

Find out how many GPH each of the nozzles you are looking at. Take your fuel flow, if you have 2 1600 CC injectors and 2 550 CC, you have damn near 4300 CC. You need to convert the 4300 CC to GPH. So take your 4300 X .016 you get 68.8 GPH.

That should be close to what you use at 100 pct duty cycle. Having said that, you can drive your car a specific boost/load and see your duty cycle. Lets say your duty cycle is .49 at your boost level. .49 X 68.8 is roughly 34 GPH.

I have no idea what the flow rate of the nozzles you are refering to. But once you have the nozzles converted and you know the GPH you can get your pct right. I have done alot of research and found that people use from 12 PCT to 30 pct.

I may be wrong on this, but I think we can use a much higher concentration of water and alcohol because our cars run so rich. I did some figuring with my DIY system and I am rougly 25 PCT and my car seems to really like it. Now, I'm running about 70 pct water to 30 pct alcohol, so its not like its a full 25 pct water.

this probably didn't help but nobody is helping you out, so thought I'd chime in.

 

Thanx,

.7mm injector is 260cc/min x .016 = 4.2 GPH?

4300 x .8 duty cycle = 3440.
So, that would be 3440 fuel at 80%duty cycle with 260 of water injected or about 7% water injected.

Right?

I'll be running a peak of 85% duty cycle. My Commander has had highs of 76% at 15 psi boost. I'll be running more boost but leaner.

 

Does this aquamist system vary the water based on BOOST? or is it like my system that comes on full at a specific boost?

I hope some others give there opinions too. All I can do is tell you what I have researched. If your system is only having a 7 pct , I think you need to get a bigger nozzel. I would recommend atleast 12-15 pct. Mine is set to come on at 8 PSI. My pump runs from 40-60 PSI depending on load. So at times mine nozzle is 6.32 at other times my nozzel is at 8 GPH. On average its about 7.2.

My system is on the twin turbos with ported engine. I have 550's +1200's for 3500 CC's of fuel. This equates to 56 GPH. at 8 lbs of boost I am at merely .49 for my fuel (On my first turbo anyway). So thats about 1715 CC or 27.44 GPH. That equates to about 26 PCT water to fuel. Keep in mind that I'm running alcohol with the water (about 1/3). I figured when I am at WOT, from my drag racing experience My car will be atleast .70 which is 2450 CC or 39.2 GPH. Taking 7.2/39.2 I end up with about 18 pct water to fuel, and again I have 1/3 alcohol, so im probably in the 12-15 pct at full boost.

Thats how I did mine. I do *NOT* have the aquamist system. My pump varies the PSI, the nozzle I have is different than yours and it varies the GPH based on the PSI. You need to factor all these in when you do yours. I think if you get a ball park figure you are ok, Just dont do to little water since you are going to run your car leaner.

 

The 2d kit dumps fuel in as a ratio to the amount of fuel you are dumping in. It comes on at whatever boost you want to start injecting water. The ratio of water to fuel is governed by the water injector size. So from what I understand the pump goes from 2-10bar pressure and the .7mm injector gets 260cc/min at 5bar pressure.
So I guess at 10bar pressure it would be 520cc/min injected.

I'm just learning this and hope to have it installed end of August. I think I'll start water at 5 psi boost. That's what Brad at KCSAAB recommended.

Thanx again,

 

if you already have the jets , start with the largest and work down (or up ) from there , you would know when you are running too much , from that point just go to the next lower size.

 

Anyone have install pictures of the 2d kit?

Can e-mail them to me at:

LUV94RX7@AOL.COM

Thanx,

 

http://www.teamfc3s.org/forum/showth...&threadid=9692

 

Thanx, good information, but it was on the 2c kit hooked to a Haltek ecu.

Ken

 

Yes you are correct in that is was a 2C kit. But if you are ambitious enough to read through the whole thread... it took me an hour.

The system was then upgraded to a 2D kit by buying the fuel injector mapping electronics, which allows the water injectiion to be mapped according to the fuel injectors on the secondaries, and only activated when there was boost via a boost switch/pressure sensor.

What i gathered from the thread was to use around 3 to 4 gallon tank to hold the distilled water. Use the biggest water injection nozzle so that your car litterally floods out.

At that point you can start dialing the fuel back so that you can run less fuel and get the full potential of water innjection.

I think you can get most of the info by reading the last 4 pages.

 

KEN,
One thing to note here

when the pressure doubles the flow does not. It is not a linear relationship. this is true for fuel injectors as well as water nozzles and turbo's too.

so your assumption above that at 10 bar you are flowing 2X the 5 bar flow rate... is wrong.
since you are using aquamist stuff.... you should look on teh webpage where they flow rate their nozzles.
ill look for the link

 

just look here

http://www.aquamist.co.uk/sl/plist/pic2/jets/jets.JPG

or go to this page and click on any of the red arrow things under the PICS column for more info.

http://www.aquamist.co.uk/sl/plist/plist4.html

 

I attached some pictures of the 2d install.

I am using the .9mm water jet at this time.

We set it up to inject water starting at 5 psi.

As you can see by the pictures everything needs to be cleaned up and made look nicer. This was right after we got done.

Steve Kan missed his flight out of Dallas. He had to scramble around for another flight and he was 7 hours late. We arrived at my brother's home for the install and we started at 10:00pm. We were done at 2:00am. Steve did a fine job considering he never saw the kit before or installed water injection on anything.

The next day did some more work on another person's car and I lead them to the dyno site for tuning on the other person's car. In the drive to the dyno I was cruising along and my intake air temps as measured by the PFC Commander was 51C. The other guy passed me for fun, I guess, and I had to kick it in to catch up. I boosted to about 10psi and the air temps dropped to 30C, so water was working.

Here again thanks to all involved.

Ken Francis

http://mywebpages.comcast.net/luv94rx7/AQUA1.JPG
http://mywebpages.comcast.net/luv94rx7/AQUA2.JPG
http://mywebpages.comcast.net/luv94rx7/AQUA3.JPG
http://mywebpages.comcast.net/luv94rx7/AQUA4.JPG
http://mywebpages.comcast.net/luv94rx7/AQUA5.JPG
http://mywebpages.comcast.net/luv94rx7/ENGINEBAY.JPG
http://mywebpages.comcast.net/luv94rx7/FUELCELL.JPG
http://mywebpages.comcast.net/luv94r...AN-INSTALL.JPG