Help for Evo 6 Water Direct Port Injection
 

Goodmorning to everyone,

I'm Paolo and I am a tuner .

We are looking to build a evo 6 for a friend.

Our ecu is Emtron Kv8 and it can support water injection so i need only to buy the hardware part for make all running fine.

https://scontent-mxp1-1.xx.fbcdn.net...eb&oe=591D33A8

We plan to run 4 nozzle into the intake manifold but i have some question regarding the fittings and strategy.
My pump will be a 200psi pump from Aem which i already had from the past so i prefear to use it since is new.

1) Can nozzles be mouted upside spraying water from bottom to up?

2) I suppose to run only water, my boost will be max 30psi accross all the powerband. I have 4x1050cc injectors and max duty cicle will be 85% for safety reason.
According to your calculator , i'll need 1050cc*4*85%* (12.5% water proportion) =
So doing maths 446cc's . Rounded for excees according that there will be some losses so... 500cc divided between 4 nozzles.

http://www.focusst.org/forum/attachm...ate-compd3.gif

looking here i need 4x0.4mm B nozzle type.

Can you confirm this for the moment?



Then i do a Basket list with
I also added items to my basket

4 nozzles with check valve
7meter 4mm hose
4 way hex manifold
and a fitting to permit my 4way manifold accept 6mm (1/4") hose from aem pump
https://i.imgsafe.org/fc3c0b0544.png
Do i need more?



Waiting for your fast reply

Thanks a lot

Paolo

Re: Help for Evo 6 Water Direct Port Injection
 

Hello Paolo,
I cannot comment on everz question you asked, but on a few.

The nozzles themself spray in any direction you point them.
For a direct port set-up, you need to place the nozzles close to the fuel injectors and on the same side as the fuel injectors.

The spray does not like to take any turns. If you mount them on the bottom, you end up with most of the spray on the front side of the intake valves and with it very unevenly in the cylinder on the side pointing towards the intake plenum. This negates a lot of the effects.
You want the nozzles to mimik the fuel injector location (in line and same side) and idealy also direction. The latter is not as important as the location.

See also my postings in this forum:
Timed Duty : Direct Port Injection. Last page
And
JET PLACEMENT FOR AIR FLOW (POST-MAF)


The nozzles you have choosen are too small in my opinion.
I am using 4x 0.4mm Typ c jets on a engine with injectors half the size.

You are likely in the 500 to 800 HP bracket with these huge injectors depending on fuel type. I'd more look into 0.6 or even 0.7mm nozzles. It is easy to regulate flow down a bit using a fast acting valve FAV, a Aquamist product. It is controlled like a fuel injector using pulse width modulation leading to a rather linear delivery behavior. I myself use the older version calld HSV or high speed valve.

Finally I would consider working with a 50/50 by weight methanol water mix unless you run e85. For e85, the methanol won't do to much anymore in a direct port set-up.

It is easier to tune, more effective and performs at rather normal AFRs.
With a 50/50 mix, you tune to lambda 0.8 to 0.85 or a indicated AFR of 12-12.5.
Any richer than 11.8 and you lose power.
With pure water, you rather want to be a tad leaner than that, so 12-5 to 13.
Otherwise effective flame speed (speed + initial delay) drops a lot, and you lose power

Re: Help for Evo 6 Water Direct Port Injection
 

You can calculate your flow requirement easier by the formula below:

1cc/hp for 100% water
1.5cc/hp for M50/W50
2.0cc/hp for 100% methanol.

Once the flow is calculated and pick the jet form the chart. Don't forget to subtract the boost pressure.

What system do you have? AEM?

Re: Help for Evo 6 Water Direct Port Injection
 

I have 200psi fuel pump from Aem but i want to order all stuff from Aquamist, more reliable parts.

Our target is 500bhp, so with only water we need 500cc's.

using 4 nozzles and doing maths 500cc/4nozzle=125cc/nozzle


Running 30psi using the chart

I am between 0.4C and 0.4B

which will you suggest me?

is right my calculation?

thanks a lot

Re: Help for Evo 6 Water Direct Port Injection
 

I'd go for at least the 0.4mm Typ c jets. That's what I was using on a way less powerfull engine.
For 500HP you should consider 0.5mm jets. Just ensure you can properly control the flow in case your ignition system can't cope.

Don't run too rich either. At any AFR (indicated on gauge as petrol equivalent, not true fluid flow) below 11.8 or indicated lambda of around 0.79 power will drop rather quickly with the water doing its thing.

If you get knock issues before hitting MBT at lambda 0.8 to 0.85, add more water/meth.