Water Injection Calculator !

scheides · Oct 15, 2008, 01:37 PM

http://www.customperformancesolution...injectioncalc/

I'm running a single 1.0mm jet on my max'd out IX turbo and recently switched to E85 and saw some performance gains. This is a great tool to help you (and me) figure out what different jets should be used for optimal fuel percentages. I'm thinking of adding a 2nd jet (.5mm) to bring it over the top.

dudical26 · Oct 15, 2008, 01:43 PM

hey thats really neat.

nice find

VividRacing.com · Oct 15, 2008, 03:26 PM

Great find!

Vigman · Oct 29, 2008, 10:00 PM

Hi guys,
If someone need an offline version, I made a replica in XLS format...
Hope you will envoy it...
Any improvement to original file will be appreciated!
Version 1 is HERE
Cheers!

RunThat · Nov 29, 2008, 11:53 AM

what is the fuel pressure at the fuel rail in an Evo VIII?

esevo · Dec 3, 2008, 10:41 PM

^^^ About 4 bar or a little less... expect 45 psi or more on the stock evo.

According to that calc one of my customers is running a 56.121% to fuel ratio with 2 x 1.0mms!! lol. That car is just plain fast!!!

Evan Smith

Ultimate CC · Feb 24, 2009, 06:01 PM

excellent find...

vroomevo · Feb 26, 2009, 11:10 AM

+1

OrthoDoc · Mar 16, 2009, 10:21 AM

I have question on Fuel pressure.
My fuel press at Idle is 2.8 bar and 4.5 bar at wot.
Should I use 4.5 bar to calculate the injector size?

kkarim · Mar 16, 2009, 02:07 PM

i used the calculator and got some weird results...

aquamist calculations.PNG

It's saying i need about 1000cc of meth flow to have 20% MFR...

seems a bit high, don't u think?

scheides · Mar 17, 2009, 02:59 PM

Nope, that's about right

2x 1.0mm nozzles should get you close!

These are ideal circumstances though, I think my setup only runs about 10-11% meth/water and I get great results. This is with a single 1.0mm jet.

LetsGo82nd · Jun 21, 2009, 07:40 PM

I have been reading thread after thread on selecting the correct Jet and restrictor size but don't seem to be getting it. I am running a IX turbo with stock injectors and will be setting up an HFS-6 system with a 50/50 mix. I am a little lost on how to know what my Injector/Fuel Rail pressure are and what the duty cycle will be? Can someone give me a how to determine jet and restrictor size for dummies?? Thanks for the help.

scheides · Jun 30, 2009, 10:20 AM

Most of those values you leave as-is. Stock injectors flow 560cc's and you have 4 of them. You need to log your car to see what your peak IDC is but if you have a walbro and all the mods listed in your sig, you're prolly running about 100% IDC peak pretty easily (not bad, I ran mine up to 127%

).

Anyways, decide how much meth/water you want to inject and set that percentage, or guess at what jets you want to run and work your way backwards. Last week I switched from a single 1.0mm jet and added a second jet. I was going to add a .8mm, but all I had was a .9mm so I just went with it. That adds up to 967cc/min based on the chart listed on that page. I'm using 2 injectors, so divide that in half for 483.5cc/min per injector target (average). With my setup and some rough numbers, that gives me about 22% of my fuel ratio being water/meth. Since I'm going for max power out of the setup, this is a good % to be at

I attached a screenshot of the settings I used. Again, rough numbers but they work.

tephra · Sep 14, 2009, 09:46 PM

Hrmm...

So I entered my stats:

560/95%/4/20%/160/25

and it reckons I need 2x 0.8 jets...

But when I used the included chart from Aquamist it says I only need 1 jet?!?

Richard L · Sep 15, 2009, 12:22 AM

Tephra,

The chart on the HFS-6 is the maximum size jet without a tune. I don't think if will suit you.