Water injection problem....HELP!!!!!

[fwdeclipse]

I finished installing my water injection and now the car will sputter once it hits higher boost.I thought maybe it was cause I was using windshield washer fluid,so I changed it to just distilled water and it still does it.Could the injector be to big?I mounted in the injector probably4-6 inches away from the tb.I disabled the water injection and the car stopped sputtering so I know for sure its the problem.Any suggestion would be appreciated thanks.

 

[awdrst]

I had that problem the very first time i went out to tune with alky injection. You need to pull some fuel out of the top end it ends up making you very rich. When the injection starts my wideband used to read 9.6 (before i tuned it) which was as low as it would go i ended up pulling a decent amount of fuel on the top end and the sputtering went away.

 

[fwdeclipse]

Well Im just running a custom stage3 keydiver chip with a 11:5:1 afr.I dont have an safc or anything like that.If im running rich then what would I need to do to have it stop sputtering.Maybe get a smaller injector?

 

[awdrst]

Turn it off until you get something that can control fuel or you may be able to get a chip made that will pull out fuel on the top end. Only problem that i see with that is you are not burning them yourself so you would tell them what to try then you put it in your car. It doesn't pull enough out or pulls too much out then you call and have them burn a new one so on an so forth. The best way in my opinion is to get a afc or something similar.

 

[fwdeclipse]

Man there has to be a easier fix than that.I dont wanna an safc there useless when I already have a custom afr and timing map burned into my chip.Im not sure if he can pull fuel out up top or not.If I get a smaller injector that should work am I wrong in thinking this.

 

[ericbev]

Your injector is probably too big and you are drowning your fuel mixture. Is it spuddering when the injection is activated? What kind of kit is it? What size nozzle etc? Lets get some details.

 

[fwdeclipse]

It starts to spudder a little after its activated and only over 20psi of boost.Its from aquastealth.com and the injector size is 300cc.If I only run 18psi of boost it wont spudder.

 

[Sivad87]

Man there has to be a easier fix than that.I dont wanna an safc there useless when I already have a custom afr and timing map burned into my chip.Im not sure if he can pull fuel out up top or not.If I get a smaller injector that should work am I wrong in thinking this.

honestly that is the easy fix, just get an afc, dsm link or any other tuning device to lean out your a/f. all your going to do is screw something up if you try and do it any other way. and no they are not useless when you allready have a custom chip. it can take you farther on top of the chip. you can add/subtract fuel on top of the chip to get the absolute best tune for your car that you can. if they were that useless when why do so many people have them?

 

[force it in]

Check your nozzle fitting inside the throttle body. Make sure that you are getting a fine mist and not a dribble. You can activate the system by grounding NO3 on the boost pressure switch. If the water is leaking past the threads on the nozzle it could drip out. I put silicone on the TB elbow where the nozzle is installed to prevent boost leaks. I'm running the M5 size nozzle (6.0 GPH @ 150 psi) with an MHI Evo 3 turbo @ 22 lbs. Methanol & water mix with 91 octane. System activates at about 8 lbs. I hope this helps you out.

 

[fwdeclipse]

Check your nozzle fitting inside the throttle body. Make sure that you are getting a fine mist and not a dribble. You can activate the system by grounding NO3 on the boost pressure switch. If the water is leaking past the threads on the nozzle it could drip out. I put silicone on the TB elbow where the nozzle is installed to prevent boost leaks. I'm running the M5 size nozzle (6.0 GPH @ 150 psi) with an MHI Evo 3 turbo @ 22 lbs. Methanol & water mix with 91 octane. System activates at about 8 lbs. I hope this helps you out.

Yeah I have it siliconed in there also.Ill check to make sure its a mist and not a dribble tomorrow.I think the nozzle might be to big.The thing that is not making sense is it only sputters at boost over 20psi so thats where im confused.

 

[Slippi84]

Your problem is you don't have a progressive setup so when you hit your boost activation setup it is flowing the full amount of water or mix that you have it set to(whatever size injector your using) So if you want to fix your problem by going with a smaller injector go for i but you won't see as good performance. The problem with your chips is it's not going off a wideband so it's not ass accurate as a setup like the new Gen2 MAFT would be at controlling your a/f ratio. So in a nut shell you can get a progessive controller which is sold threw most companies that sell water injection kits or you can like they said get a safc or such and take fuel out up top either way those solutions will solve your problem and keep the benefit of using water injection intact.

 

[GSTdude06]

I didnt think 300cc injectors could handle 18psi.... is that just me?

 

[force it in]

Did you wire in a light to let you know when your system activates? This could help you troubleshoot the problem. I have an LED that comes on when my solenoid energizes. I use this LED to adjust the boost control switch. Also when I ran straight distilled water I used the M4 size nozzle & activated the system around 12 lbs. Any lower any the car would bog when it came on. Now I use a water & methanol mix with 91 octane. I went up 1 nozzle size (M5) and turned up the pump pressure (1 complele turn on a 100 psi pump). It now turns on at 8lbs. of boost. It keeps my knock in the single digits. Heres a link with info on nozzle sizes.
http://www.enginerunup.com/parts/injector-nozzles/prod_9.php

Another link. Search for misting nozzle
http://www.mcmaster.com/

 

[Slippi84]

I didnt think 300cc injectors could handle 18psi.... is that just me?

What psi your running doesn't detemrin how big the injector should be most people say 80% of one of your injectors.

 

[force it in]

What psi your running doesn't detemrin how big the injector should be most people say 80% of one of your injectors.

Maybe GSTdude is thinking fuel injector size instead of water injector nozzle.

 

[Slippi84]

Maybe GSTdude is thinking fuel injector size instead of water injector nozzle.

Oh well in that case whne the guy said the injector is 330cc he meant his water injection nozzel not his cars fuel injectos.

 

[fwdeclipse]

Well Im probably going to be getting dsmlink here in the near future,so until then I guess I will probably get a smaller nozzle.Does anyone know why its only sputtering above 20psi and not under.I would think it would sputter worse at lower boost.Thanks for the help guys.

 

[Bohrn]

I run 2x 0.4mm Aquamist nozzles and with no fancy progressive controllers or anything, just turn em on with a pressure switch at around 4 or 5 psi. Works seamlessly. I nearly had a 108mph pass last nite (107.66) and I am running 22psi on a 14b. And I run blue bug juice. I say this to let you know you don't need anything different in your water injection setup.

As you say your setup sputters with higher boost and water injection on, I am going to call ignition. I'd say specifically spark plug gap is too big or plugs are worn. Also could be weak ingnition system not delivering enough spark energy. Now, saying that, I don't mean for you to put fancy MSD boxes or anything in, just make sure your stock system is up to par.

Pull your plugs and replace em if any rounding of electrodes is present. Gap them to 0.28 no bigger. And don't rely on the factory gap, they are often incorrect. See, my theory is that your spark is on the verge of being blown out at your higher boost setting, and when you add the water, it just helps blow it out.

 

[fwdeclipse]

I had a problem with sputtering awhile back before I ever got the water injection and I gapped my plugs to .26 and that made it go away.Maybe Ill change the plugs and see if there fouled or something.There is no way I could go lower on the gap is there?I have some bpr6es I could use,I dont know of anywhere local that sells 7s.

 

[Bohrn]

pull em out and make sure they are still gapped at 0.28 or maybe a tad closer. with age, they will wear, increasing the gap.

 

[fwdeclipse]

I went ahead and put in my other plugs and it seemed to help.So Im gonna order some brand new ones and I think ill be alright.Thanks alot for the help.

 

[fwdeclipse]

Well now I dont think the water injection has anything to do with it.After I put the other plugs in it seemed to run good but then went back to bad.I unhooked the water injection and its still doing it.So could my wires be bad if it only sputters above 21psi.It runs great anything below that.

 

[DJ23GSX]

Sounds exactly like my 1g maf overrun problem i had. It would studder at high rpm's over 18psi of boost but run great under 18psi. I assume by your mod list your still running your stock 2g maf and 21psi shouldn't overrun it but every car is different.

 

[GSTdude06]

Ya I was thinking injectors for fuel... I had stutter when i tried boosting 18+ on my stock 450's.... my bad yall