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Subject: "fuel pressure for stock injectors" Previous topic | Next topic
BoostedEclipseOct-27-06 03:41 PM
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#101611, "fuel pressure for stock injectors"


          

I have a 97 eclipse rs-t. I rebuilt my car with the forged pistons, rods, and upgraded valvetrain. I had a holley fuel pressure regulator and walbro fuel pump running my car before the rebuild. When I did the rebuild I upgraded to blue top 450cc injectors and a safc 2 and a sfmu . Now I wish I would have just left that crap alone. I've had problems with it running right and I don't want to f-up my car with the new engine. I'm thinking of throwing my stock injectors back on without the safc2. Now that I have an sfmu rather than my old holley fuel pump, I need to know what I should set my static fuel pressure at with stock injectors. If anyone could give me some info I would deeply appreciate it.

  
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Replies to this topic
RE: fuel pressure for stock injectors, Moderatorcs82685, Oct-27-06 04:19 PM, #1
RE: fuel pressure for stock injectors, BoostedEclipse, Oct-28-06 05:41 PM, #2
      RE: fuel pressure for stock injectors, Moderatorcs82685, Oct-28-06 06:28 PM, #3
           RE: fuel pressure for stock injectors, BoostedEclipse, Oct-29-06 09:06 AM, #4
                RE: fuel pressure for stock injectors, BoostedEclipse, Nov-02-06 11:40 AM, #5
RE: fuel pressure for stock injectors, boosted60trimrst, Oct-29-06 09:01 AM, #6
RE: fuel pressure for stock injectors, BoostedEclipse, Oct-29-06 09:14 AM, #7
RE: fuel pressure for stock injectors, Moderatorcs82685, Nov-02-06 12:49 PM, #8
      RE: fuel pressure for stock injectors, BoostedEclipse, Nov-02-06 01:44 PM, #9
           RE: fuel pressure for stock injectors, boosted60trimrst, Nov-05-06 07:10 PM, #10
                RE: fuel pressure for stock injectors, Moderatorcs82685, Nov-06-06 04:30 AM, #11

Moderatorcs82685Oct-27-06 04:19 PM
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#101612, "RE: fuel pressure for stock injectors"
In response to Reply # 0



          

umm, I don't remember static, but idle should be between 47-55. Use the largest disc for the sfmu.


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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BoostedEclipseOct-28-06 05:41 PM
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#101631, "RE: fuel pressure for stock injectors"
In response to Reply # 1

          

Ok, say if I wanted to run bigger injectors than stock like 310cc. What disc would I put in my sfmu? And would that lower my fuel pressure or would I still run the stock fuel pressure? See I want to boost higher than stockers can support safely, but, I don't want to go so big that the sfmu and injectors alone can't handle them.

  
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Moderatorcs82685Oct-28-06 06:28 PM
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#101632, "RE: fuel pressure for stock injectors"
In response to Reply # 2



          

Originally posted by BoostedEclipse
Ok, say if I wanted to run bigger injectors than stock like 310cc. What disc would I put in my sfmu? And would that lower my fuel pressure or would I still run the stock fuel pressure? See I want to boost higher than stockers can support safely, but, I don't want to go so big that the sfmu and injectors alone can't handle them.


310's the 2.72" disc with largest ring and dark spring should be just about right with idle fp around 20-22psi. You can also stay with the largest disc and no ring and a bleed valve. This is what I remember off the top of my head. Do a search for sfmu and 30# or 310's or 330's or even 440's and read up a bit you will find plenty of information, there are a couple threads in which people posted how they had their sfmu setup and with what injectors.

Also, if you have a -4an return line, you are probably not going to be able to get your idle fp down to 20-22 psi. I couldn't get mine under 28-30 psi until I upgraded to a -6an return line.


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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BoostedEclipseOct-29-06 09:06 AM
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#101641, "RE: fuel pressure for stock injectors"
In response to Reply # 3

          

How much boost could I run with the 2.72 disc and ring before maxing out the injectors.

  
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BoostedEclipseNov-02-06 11:40 AM
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#101739, "RE: fuel pressure for stock injectors"
In response to Reply # 4

          

Oh and where should my afr be with this setup?

  
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boosted60trimrstOct-29-06 09:01 AM
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#101640, "RE: fuel pressure for stock injectors"
In response to Reply # 0



          

im running big disk no reing with bleedvalve and it works great for 30lb injectorw.

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
http://imageshack.us>


http://www.2gnt.com/index.php?d=boosted60trimrst
My contribution to the wiki
http://www.2gnt.com/index.php?d=crank%20arm%20spindle%20mod%20to%20fit%20power%20panels

  
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BoostedEclipseOct-29-06 09:14 AM
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#101642, "RE: fuel pressure for stock injectors"
In response to Reply # 0

          

All I want is a temporary fuel setup without an safc 2 that can boost up to 10 psi without maxing out injectors for my car while I research and decide which megasquirt kit I want.

  
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Moderatorcs82685Nov-02-06 12:49 PM
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#101740, "RE: fuel pressure for stock injectors"
In response to Reply # 7



          

Originally posted by BoostedEclipse
All I want is a temporary fuel setup without an safc 2 that can boost up to 10 psi without maxing out injectors for my car while I research and decide which megasquirt kit I want.


310s or 330's are perfect for this

Originally posted by BoostedEclipse
Oh and where should my afr be with this setup?


not positive, but I think you wanna tune for 10.5:1 under boost, you should be able to find it with a quick search (hint, hint these are all pretty easy answers to find)


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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BoostedEclipseNov-02-06 01:44 PM
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#101741, "RE: fuel pressure for stock injectors"
In response to Reply # 8

          

I appreciate the help. I have searched, but I guess I haven't typed in the right thing yet.

  
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boosted60trimrstNov-05-06 07:10 PM
Member since Sep 10th 2005
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#101777, "RE: fuel pressure for stock injectors"
In response to Reply # 9



          

actually tune for 11.5 under boost . 10.5 is too rich

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
http://imageshack.us>


http://www.2gnt.com/index.php?d=boosted60trimrst
My contribution to the wiki
http://www.2gnt.com/index.php?d=crank%20arm%20spindle%20mod%20to%20fit%20power%20panels

  
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Moderatorcs82685Nov-06-06 04:30 AM
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2007 posts, 		Click to send email to this author Click to send private message to this author Click to view this author's profile Click to add this author to your buddy list
#101778, "RE: fuel pressure for stock injectors"
In response to Reply # 10



          

Originally posted by boosted60trimrst
actually tune for 11.5 under boost . 10.5 is too rich


oops, I knew it was one of those


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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