BlackVert's DIY water injection thread

BlackVert · Feb 28, 2006

i plan to to screw one of these nozzles backwards into one of these bushings:

and then screw that into my intake. there is already a fairly good sized hole in the intake for the bushing. i am hoping the head of the nozzle isn't too big to fit through the hole in my intake.

for the pump, i'm going to try using a windshield washer pump at first.

i will turn it on and off by hand (at least for now) with a little switch in the cabin.
*edit* i think i should use the above hobbs switch instead *edit*

i will try attaching the pump to the nozzle with a rubber hose and a zip tie.

sounds pretty ghetto, huh?

costs so far:

Code:

$17 - universal windshield washer pump
 11 - 2 nozzles (McMaster-Carr, #s 3178K63, 3178K75)
 24 - hobbs switch (ATP turbo, #ATP-BCS-003)
  5 - 5 feet of rubber hose
  2 - switch from Radio Shack
-----
 59 - within my budget, so far.

haulbalz · Feb 28, 2006

I WANNA KNOW HOW THIS TURNS OUT

tmoss · Feb 28, 2006

what will activate the Hobbs?

BlackVert · Feb 28, 2006

tmoss said:
what will activate the Hobbs?

boost pressure from the blower

tmoss · Feb 28, 2006

give it a shot, good old fashioned shade tree mechanic stuff. Be sure you know how much water is being injected (flow into a measuring bowl) and about what the rate should be.

94TURBO5 O · Feb 28, 2006

LOL I was ready to inject that blower and tap the nozzles 2 days before it came off. Do you already know where to tap the nozzles?

Don 95Vert · Feb 28, 2006

Yellow95 over at the Corral (Gary Gant) and I designed a DIY water injection setup years ago - if you need some tech about that, check out my web page (http://www.lasotaracing.com) and go to the tech articles - I moved the tech article over there.

The McMaster Carr nozzles work very well - I think I used a 5M for my KB when I had it. I also used a bushing, but I made it myself. Its called a 'hex nipple' and you can get it in any hardware store - get a 1/4" hex nipple, then tap the inside part for 1/8" NPT thread - the sprayer will screw right in - I ALWAYS used red Loctite so it never came apart. I also show on the website where we found one of the best areas to inject before the blower. Since then a couple of people have injected in the discharge manifold with good results. The 5M nozzle at 14# of boost dropped my ACTs from probably close to 300* to just under 200*.

Hope this helps you all out.
Don

BlackVert · Feb 28, 2006

i probably should include a solenoid ... add $13 more to the total ..

http://www.poweraire.com/products/valves/solenoidvalves/valve-mini.php

Code:

$17 - universal windshield washer pump
 13 - Solenoid (PowerAire #2MS10/3212DC)
 11 - 2 nozzles (McMaster-Carr, #s 3178K63, 3178K75)
 24 - hobbs switch (ATP turbo, #ATP-BCS-003)
  5 - 5 feet of rubber hose
-----
 70 - within my budget, so far.

if i get to $100, then i might abort and decide it's not the savings. in that cas, i'd get the stage 2 system from snow performance and be done with it.

donkey_punch · Mar 1, 2006

this should help you out some. http://members.cox.net/stevemonroe/AlcoholInjMod.html
i hope to one day put something together.

take pics and let us know how it turns out.

later
joe

BlackVert · Mar 2, 2006

The nozzles got here from McMaster-Carr in 1 day

The nozzle is 1/8" NPT and it fits in the 1/4" x 1/8" bushing (in the first picture) that fits in the port on the blower, but the threads don't go all the way through, so I can't put it in backwards yet. Also, the head of the nozzle is too big to fit thru the hole, so I'll have to grind it if I want to use it in the blower.

94TURBO5 O said:
LOL I was ready to inject that blower and tap the nozzles 2 days before it came off. Do you already know where to tap the nozzles?

There is already a 1/4" NPT threaded tap on the vacuum side of the blower. I'm hoping to use that. I'm using it now for the PCV, but I can TEE that into either the tree or the emissions vacuums that are using the other 2 ports.

haulbalz said:
I WANNA KNOW HOW THIS TURNS OUT

It turns out that Eades (Chris) is selling his Snow Stage 2 kit, and the price is good enough that I have decided to take his and be done with it. And the Snow nozzles don't have the problem with the heads not fitting through the hole, so I won't need to machine the nozzle either

I still plan to complete my kit as time permits though, installing it before the throttle body for fun and to compare it to the Snow Kit. I might end up using mine for cooling (water only) under normal driving and the Snow kit (with methanol) for when it is under boost ...

BlackVert · Mar 3, 2006

it's alive!

BlackVert · Mar 8, 2006

My goal for my DIY injection system is to cool the intake charge under normal driving conditions (not WOT).

To that end, I want to be able to have it inject my "liquid of choice" under the following conditions:

- when the voltage from the ACT is over some value I can control with a dial (e.g. - 3.2 volts)
- when the voltage from the MAF is over some other value I can control with a dial (e.g. - 1.6 volts)

I am working on the circuit for that, and I think I am pretty close, but I am still messing around with it.

So far, here are the components in the circuit:

- 1 POTENTIOMETER for the ACT threshold dial
- 1 POTENTIOMETER for the MAF threshold dial
- 2 OP-AMPs (in a single IC) to detect when the ACT and MAF voltages reach their thresholds
- 2 NPN TRANSISTORs to AND the signals from the OP-AMPs together
- 2 RESISTORs to force the current across the TRANSISTORs to the RELAY (not thru the bases)
- 1 RELAY to provide power to the secondary circuit (with the pump)
- 1 LED to tell me when the PUMP is activated

I am currently using POTENTIOMETERs to simulate the outputs of the MAF and the ACT.

I have it turning on the LED at the right time , but I have no confidence in it yet.

I'll post a schematic later when I can ...

tmoss · Mar 8, 2006

cool stuff - keep it comming.......

BlackVert · Mar 8, 2006

Here's the schematic:

The 2 POTs are how you adjust the trigger voltages for the ACT and MAF

So far, I have burned up one op-amp and a potentiometer on my breadboard ...

tmoss · Mar 8, 2006

cool - remove the ground symbol from your POS will ya

BlackVert · Mar 8, 2006

lol, i'm not up to par on the symbols yet.

BlackVert · Mar 8, 2006

This one is more accurate ...

BlackVert · Mar 10, 2006

geez, i thought at least one EE type would have a comment or two

Zero Signal · Mar 10, 2006

Yeah too bad my brother isn't on these boards. I can't wait to see how it works out!

tmoss · Mar 11, 2006

How finicky is the pot adjustment? How many turns pot did you use - 1 turn, 10 turn,?

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