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Old 07-14-2003, 10:34 PM   #1
Trizzle
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with EJ25 Power

Default Safe max fuel pressure on stock RS injectors?

I'm running an EJ22T w/EJ25 SOHC heads (eric's old car). Recently replaced some leaky vacuum lines to the RRFPR and saw a big jump in fuel pressure as a result. Now it is usually near 90 at full throttle/boost, and sometimes can go over 100 psi. Before it was usually maxing out around 60 psi. Replacing the vacuum lines also completely cured the hesitation/stumbles i was experiencing.

What is a safe max level for the stock RS injectors?
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Old 07-15-2003, 08:35 AM   #2
Revision
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Try a Search..

Here is an example which has your answer tho.

Good Reading
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Old 07-15-2003, 03:17 PM   #3
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Stock Subaru turbocharged vehicles are supposed to deliver at 40psi idle (360cc's FPR). Not sure about WOT but 100psi is not something you should be running.
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Old 07-15-2003, 09:04 PM   #4
Avenger
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I think it was somewhere around 70 to 80 psi. But leaving the idle pressure to about 40 is good.. I once had it at about 50 and the car ran really bad.
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Old 07-15-2003, 10:50 PM   #5
Trizzle
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ok, i've got it backed off to where it peaks at around 80 and sometimes 85, i will probably back it off a little more... it seems like it lost a noticeable amount of power compared to when it was up around 90-100 unless it was just my imagination, but i don't think it was.

I need to get some better injectors so i can get more fuel to that thing, it was really feeling strong at that high fuel pressure. Would wrx injectors be big enough or should i get something bigger? I'd like to eventually be able to run maybe as high as 20 lbs of boost if my turbo will produce it.
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Old 07-17-2003, 03:40 AM   #6
STi-Nismo Dood
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if you have side-feed injectors, yes, WRX injectors will work but thats only 380-400ccs, in the meantime, back off as much the with high fuel pressure, because I am running a 1.8t w/ 6psi and am already using 360cc injectors which is noticably bigger than ur stock 2.5's. If you are running piggy backs and fit side feeds, get the 550ccs, anything bigger than that I would imagine that your ECU wouldn't handle. For 20psi, 550cc injectors should be maxed out on high fuel pressure for sure.
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Old 07-17-2003, 10:50 PM   #7
Trizzle
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So i talked to Sean (Shaun?) at RalliTek today and he said i don't really need to worry about the fuel pressure much. This is contrary to a lot of things that i've heard but he seemed to think it was ok up around 90 or so and that my engine was safe. He just said the main thing i should keep an eye on is the A/F ratio.

We talked for quite a while about engine management possibilities and other topics and he seemed very knowledgeable.
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Old 07-20-2003, 11:30 PM   #8
Trizzle
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*bump*

Does anybody disagree with the stuff from the last post?
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Old 07-21-2003, 07:41 AM   #9
QfactorRS
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well, i don't know about disagreeing with a professional on the matter.

I am running the same setup as you are, at least motor wise.

EJ22 T with stock heads.

I am only running 5psi at the moment for break in, i have about ~500mi on the block and heads, so 1000 more to go.

For fuel, i am still running the setup that i was on the 2.5L, higher fpr and rrfpr (10:1 ), the rate on the rrfpr is ridiculous, i am looking for a vendor that sells the vortech plates for the rrfpr.

anyway, i max @ 95psi when WOT and max boost. I dunno whether it is safe or not for the injectors, i wanna tune down to 80psi, just in case.

on the other hand, my idle is still at 55~60psi!! and i dunno why

Q

good luck with your setup as well.
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