Water/Meth injection. All in or progressive with multiple nozzles?

[Krochus]

I’m in the process of wiring my little blow through 1600 single port for a Snow performance stage 1 water meth kit. Right now I have one solenoid and one nozzle just above the 30 pict 3 carb in my charge pipe. This is going to be switched on via my Megajolt ignition box and one of the user defined outputs. Probably somewhere around 5 psi with 10 being max boost.

This setup uses a little gt15 turbo for instaspool so I can be at 5 psi with very part throttle at times when accelerating. My question having not sprayed any boost juice yet is would I be better served spraying progressively using two nozzles and two solenoids with a much smaller hit on the low end of my boost so as to not drown the engine down?

OR is it one of those things that just doesn’t matter?

[Chip Birks]

I think this is something Clonebug could comment on. Pretty sure he used to have a single stage system, but found that it caused the motor to blubber and run funny during those part throttle low boost times. I think he ended up building a 2 stage setup, allowing him to jet down a bit for the low boost, but then still supplying enough when the boost got high.

[Clonebug]

Twice I had a big long answer typed up but ended up not posting since it just seemed like a bunch of rambling.

Page 100 in my build has the start of my staged W/I build with the cheap solenoids. I switched to quality solenoid due to the vacuum sucking water through them once I installed one on the vacuuum side of the TB.

It comes down to a matter of preference...If you like the progressive controllers they would probably work fine. I don't trust them and would rather have a simple on/off mechanical setup that pumps a measured amount of water.
YMMV

The staged system has been working great for me and I can see the temp drops in my log when the second nozzle kicks on.
I also have a switch that turns off boost control to 6.0 lbs. and I can drive across the U.S. at that setting without even using water while having 112 whp and 133 lb. ft. of torque.

[Krochus]

Thanks guys.

I guess an update is in order.

I don’t know if I’m just lucky selecting parts or and actually kind of good at this.

I’ve gone on a couple of drives now and got back from a rather vigorous one through the mountains a few minutes ago.

I fully expected to be able to tell when the water meth kicked on in the form of a brief drop off in power. But as it turns out the transition is invisible with my 175mp per min nozzle

The spray comes on at 135kpa and my boost is topping out at 175ish.

Now it’s kinda cool out and it may be that in summer I might get some detonation below where my activation is now. I ran the wires to run two solenoids and should that be the case I will split the current amount into two. stages.

After a fairly spirited 40mile drive half of which was on twisty mountain roads I only used roughly 2 ounces of boost juice.

So far it’s been a huge success. Zero detonation even in 4th at max boost uphill. I have already added two degrees of timing at max boost which is apparently enough to power now to overpower the clutch even in a 1400lb rail. I think Saturday I’m going to make an appointment to put it on the dyno and hope that 3rd gear will hold the power to get some good numbers.

[Krochus]

One “problem” that I have that I’m not sure even needs addressed is I have my nozzle mounted fairly close to my Bosch bypass valve. So when it releases after letting off the throttle it does put out a little juice through the filter onto the fan shroud.

[seabeebuggy]

I have multiple nozzles, controlled by independent pressure switches. easy setup.

[Krochus]

I have multiple nozzles, controlled by independent pressure switches. easy setup.

This is good info to know! How many ml per min or GPH are you spraying

I am able to switch up to four I believe with my Megajolt box.

[seabeebuggy]

If i remember correctly i have 2 total. at 7lbs boot it is 400cc and 10 another 300 i believe. total of 700. I would really need to go look at my build thread to see what it was for sure.