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Old 08-14-2006, 04:35 PM   #1
BadTrip
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Default 150psi Pump vs 100psi Pump?

For a relatively low hp application (~300whp) single stage system....why would one want a 150psi pump as opposed to a 100psi pump?
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Old 08-14-2006, 04:57 PM   #2
hippy
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More pressure generally means better atomization of the liquid with a given nozzle. Imo, atomization should be fine at 100psi, and with a staged system, it shouldn't really matter if the pressure is 100 or 150psi(course the nozzle you use could be different). Course if you ever think you'r gonna want to change the system to have adjustable flow, higher pressures should allow you to have a wider range of flow with a given nozzle. I think there are companies out there which have the 150watt shureflo pump pushing 220ish psi......

The shurflo 150 watt pump is rated to run 10F higher then the 100watt pump(before it's "too hot"), and can run longer before it gets to the point where the temp is too hot. The overheating part shouldn't matter though, since if the setup is used correctly, it should take over a half hour of constant flow for the pump to overheat. The 100 watt pump weighs less and uses less amps at 100psi then the 150 watt pump.

peace

Last edited by hippy; 08-14-2006 at 05:18 PM.
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Old 08-14-2006, 05:17 PM   #3
BadTrip
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And if you wanted to move to a dual stage system? Would the 150psi pump be what you'd want/need?
I'm never going to be into the 400whp range or anything like that. ...............unless I get that engine swap. So it probably would never even come into play.
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Old 08-14-2006, 05:26 PM   #4
hippy
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With a dual stage system, I'd think it would probably be better to run lower pressure, because that would allow you to use better flowing nozzles which might not clog as easily(as nozzles which don't flow as well). You could use a dual stage system with a lower power setup, but the nozzles would have to be some of the ones which don't flow as well, and ya might run into the problem of them clogging more then ones which flow more. From what I've heard, navybluesubaru uses a 2gph nozzle, and a 3gph nozzle. One turning on at a lower pressure then the other. I don't really think this is necessary, but it could possibly help perfomance in certain situations by making it easier to keep the water/fuel ratio more consistent.

peace

Last edited by hippy; 08-15-2006 at 01:27 AM.
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Old 08-15-2006, 08:37 AM   #5
BadTrip
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Thanks for the insight!
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Old 08-21-2006, 08:17 PM   #6
orthojoe
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I've got an STi that gets 400whp with an FP3065 turbo running water injection using the coolingmist older 100psi silver pump. I'm planning on getting the car re-tuned with methanol injection. Is it worth it to upgrade to the new 150 psi pump? Or should I stick with the original pump? I have the M5 injector.

While I am at it, the kit I bought came with the electric solenoid. Should I seriously consider replacing it for the regular checkvalve?

Thanks
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Old 08-21-2006, 08:46 PM   #7
hippy
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With a staged system, I'd leave the pump you have on there. Your m5 nozzle will be fine, but while running 100% alc you can generally run more injection then if you run water. This would mean that you could get away with running a bigger nozzle, and it would probably help performance if tuned for correctly. How big is debateable, and bigger will obviously cost more in alc over time. Imo the solenoid is fine, and I would rather use a solenoid with a system that has full pressure all the time, then a check valve with a system that's activated by electricity to the pump. Course that's just me.....

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