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Min Jet Pressure Question

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Old 04-10-2005   #1 (permalink)
Water Injection Newb
 
Join Date: Apr 2005
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Default Min Jet Pressure Question

Just curious as to what the min pump pressure you need to keep the jet from dribbling? Reason I am looking into it is because I currently run a 3.4 and never really plan on going much smaller than a 3.2 so obvioulsy that large pump will be overkill, but since I am not seeing much KR with the 3.4 I wanted to use the system to kill what I do have for my day to day driving.

I know initially you were referring to a T5 jet? correct me if Im wrong...
Just not sure if I will ever take full advantage of the T15 (or whatever designation you call it) Or does it matter? Meaning I dont want to run a T15 at lets say 30psi and have it dribble into the intake if I should be running a T5 at 30psi

Thoughts?

Oh, BTW I just dug up this page based on your sig on clubgp and figured I would post my questions here so I dont confuse everyone buying your kits ;)
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Old 04-11-2005   #2 (permalink)
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Default Re: Min Jet Pressure Question

For a 3.4 pulley a M15 at 60psi should work nicely. the pumps can acctually go below the 60psi factory pre-set just turn the allen head counter clock wise. When you decide to go with a 3.25 just take it up to about 80psi.



M10 @40PSI = 6.32 @100PSI = 10.0GPH


M15 @40PSI =9.49gph @100psi = 15.0
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Old 04-11-2005   #3 (permalink)
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Default Re: Min Jet Pressure Question

Would the mixture actually atomize at such a lower pressure?
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Old 04-11-2005   #4 (permalink)
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Default Re: Min Jet Pressure Question

Actually, my 3.4 is on my Comp-G which I hear is the equivalent of a 3.25 on the GenIII since we push out more boost stock.... But lets say I am only getting 2kr at the top of a gear (Im getting more than that but just for the question heh).... Now obvioulsy you dont want to spray much water into your system to tune it out which is what I am concerned with... So with that in mind would you A. go to a lower PSI at the pump until its tuned and possibly have problems with atomizing the water properly with the M15 or B. Go to a smaller nozzle like a M10 or M5 to keep the spray proper....

Just trying to figure out the best setup since I never plan on dropping pulleys too much and will be using the W/I with the 3.4 for the most part... Just dont want to have the water dribbling out of the M15 nozzle if I set the pump to lets say 10psi.....

Or are these static volume nozzles? I was thinking that theyre not since I see no regulator and increasing pump PSI increases output of the water....

Oh, and thank you very much for all this R&D for those of us not wanting to shell out $$$ for intercoolers... It will help the mild/med modders like myself very very happy :D
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Old 04-11-2005   #5 (permalink)
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Default Re: Min Jet Pressure Question

These nozzle will mist even a low volume, they do not dribble.

And yes increasing the PSI of the pump increases your water amount, that's pretty much the whole point of a progressive system.

If you have a 04 with a 3.4 I would recommend 60psi and up, every car is different so it's all about the tune when you get the kit on the car.
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Old 04-12-2005   #6 (permalink)
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Default Re: Min Jet Pressure Question

Thanks for answering my concerns..... Ill be ordering a kit when its available ;)

Going to have to set up a trip to MI after this summer to get tranny work done after I put this on.... I have a feeling Im gonna need all the help I can get to keep the car from snapping bad things
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