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Subject: "Fuel Pressure" Previous topic | Next topic
gilee_8Dec-12-03 05:46 PM
Member since Jun 11th 2002
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#62124, "Fuel Pressure"




          

Hi, I been asking this questions awhile back.
But today, I use the search and read alot of the old SFMU tuning post.
And many people say different setup for my current mod.

My current Mod: SFMU, Walbro 255HP, 30lb injectors, boost 5.5PSI, with FMIC, Silver Spring & largest (3.72") disk in SFMU.
My current Idle Fuel Pressure is 22-23PSI
No Bleed value setup yet.

I just have a few questions:
1) When cold and warming up, my idle fuel pressure goes to ~27PSI but after warm up, the gauge reads ~22PSI. Is that normal?
2) Should I use 3.72" disk with silver disk? or should I use 2.92" (the 2nd largest) disk with ring and black spring? which is better?
3) When I boost to 5.5PSI, my fuel pressure is around ~65PSI but then if I WOT it (push it more) it stay at 5.5PSI but my fuel pressure jumps up to around 80-90PSI. Is that normal for no bleed value setup?

Thanks alot.
Gil

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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Replies to this topic
RE: Fuel Pressure, gilee_8, Dec-13-03 08:14 AM, #1
RE: Fuel Pressure, ryan_siefring23, Dec-13-03 09:57 AM, #2
RE: Fuel Pressure, turbo8u, Dec-13-03 10:03 AM, #3
      RE: Fuel Pressure, grain, Dec-13-03 10:44 AM, #4
RE: Fuel Pressure, gilee_8, Dec-13-03 11:08 AM, #5
RE: Fuel Pressure, grain, Dec-13-03 12:12 PM, #6
      RE: Fuel Pressure, gilee_8, Dec-13-03 12:17 PM, #7
           RE: Fuel Pressure, gilee_8, Dec-14-03 05:33 PM, #8
                RE: Fuel Pressure, Global Ruler Of All ThingsDarkOne, Dec-14-03 06:31 PM, #9
                     RE: Fuel Pressure, Eclipse2NR, Dec-15-03 07:33 AM, #10
                     RE: Fuel Pressure, Eclipse2NR, Dec-15-03 07:33 AM, #11
                          RE: Fuel Pressure, gilee_8, Dec-15-03 10:33 AM, #12

gilee_8Dec-13-03 08:14 AM
Member since Jun 11th 2002
1441 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
#62131, "RE: Fuel Pressure"
In response to Reply # 0



          

No Body?
How come everytime I ask about fuel problems, no one can give me some solid answers? I know and I did "SEARCH" it's been close to 1 month ok.... I search and read alot, I just need some direct solid answers!
Thanks.
Gil

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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ryan_siefring23Dec-13-03 09:57 AM
Member since May 18th 2003
37 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
#62134, "RE: Fuel Pressure"
In response to Reply # 0

          

Originally posted by gilee_8
Hi, I been asking this questions awhile back. But today, I use the search and read alot of the old SFMU tuning post. And many people say different setup for my current mod. My current Mod: SFMU, Walbro 255HP, 30lb injectors, boost 5.5PSI, with FMIC, Silver Spring & largest (3.72") disk in SFMU. My current Idle Fuel Pressure is 22-23PSI No Bleed value setup yet. I just have a few questions: 1) When cold and warming up, my idle fuel pressure goes to ~27PSI but after warm up, the gauge reads ~22PSI. Is that normal? 2) Should I use 3.72" disk with silver disk? or should I use 2.92" (the 2nd largest) disk with ring and black spring? which is better? 3) When I boost to 5.5PSI, my fuel pressure is around ~65PSI but then if I WOT it (push it more) it stay at 5.5PSI but my fuel pressure jumps up to around 80-90PSI. Is that normal for no bleed value setup? Thanks alot. Gil



i would use a smaller disk, the 2,75" one will work better. i ono about the fuel pressures. i'm haveing the same problem now too. i only have limited experance tunning cars. the idle fuel pressure sounds about right. i will be running mine at 21,22 pis,
and i'm running 30#'s too

i will be trying to tune my car here in the next week.
lata

i have an avenger, needs a turbo though.

  
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turbo8uDec-13-03 10:03 AM
Member since Jun 15th 2003
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#62135, "RE: Fuel Pressure"
In response to Reply # 2
 Dec-13-03 10:04 AM by turbo8u



          

22psi at idle and about 80psi at 10psi of boost.

why do you have 310's if you're only pushing 5psi....?

edit: without a bleed valve the fuel pressure rises to fast. you sir are running pig rich
_________
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san clemente, ca

DarkOne> Screw you guys, i'm going home.
chrysler kid> and fyi i have never HAD to shave.
DR1665> I'm sure your Talon and my Talon are all there needs to be, since we're the only two Talons that really matter around here

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grainDec-13-03 10:44 AM
Donating 2GNT member
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#62140, "RE: Fuel Pressure"
In response to Reply # 3

          

holy shit, no bleed valve with the 3.** disk? you must have fuel spraying out your exhaust!

  
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gilee_8Dec-13-03 11:08 AM
Member since Jun 11th 2002
1441 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
#62142, "RE: Fuel Pressure"
In response to Reply # 0



          

Originally posted by gilee_8
1) When cold and warming up, my idle fuel pressure goes to ~27PSI but after warm up, the gauge reads ~22PSI. Is that normal?

So is it normal that idle fuel pressure is higher before warm up?

Originally posted by gilee_8
2) Should I use 3.72" disk with silver disk? or should I use 2.92" (the 2nd largest) disk with ring and black spring? which is better?

I use 30lb injectors for future upgrades after rebuilt. SO I should use the second largest disk 2.75" with largest ring and black spring. Correct? (with a bleed value?)

Originally posted by gilee_8
3) When I boost to 5.5PSI, my fuel pressure is around ~65PSI but then if I WOT it (push it more) it stay at 5.5PSI but my fuel pressure jumps up to around 80-90PSI. Is that normal for no bleed value setup? Thanks alot. Gil

So Is this how the fuel system works normally? it goes higher as soon as I do WOT after I reach 5.5PSI - 6PSI...??

Thanks all

P.S.
SO should I keep my current setup of:
1) 3.72" disk & silver spring with no bleed value?
2) 3.72" disk & silver spring but add a bleed value?
3) changinng to 2.75" disk, ring, & black spring with bleed value??

Thanks guys.
Gil

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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grainDec-13-03 12:12 PM
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#62143, "RE: Fuel Pressure"
In response to Reply # 5

          

run the 3.** disk. dark spring. bleed valve.

  
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gilee_8Dec-13-03 12:17 PM
Member since Jun 11th 2002
1441 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
#62144, "RE: Fuel Pressure"
In response to Reply # 6



          

Does anyone make a cheap kit of bleed value?
THanks.
Gil

So no need for ring and 2.75" disk?

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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gilee_8Dec-14-03 05:33 PM
Member since Jun 11th 2002
1441 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
#62209, "RE: Fuel Pressure"
In response to Reply # 7



          

No More Inputs?

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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Global Ruler Of All ThingsDarkOneDec-14-03 06:31 PM
Donating 2GNT member
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#62210, "RE: Fuel Pressure"
In response to Reply # 8



          

Everything is perfectly normal. You're set up just fine. Thanks emoji

______________________________
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'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



Factory Service Manuals: http://nawdu.de/files/

  
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Eclipse2NRDec-15-03 07:33 AM
Member since Nov 25th 2002
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#62224, "RE: Fuel Pressure"
In response to Reply # 9

          

Damnit Gil I sent you a link a long time ago in one of your several hundred threads about fuel systems. Me and DSMRoadster figured out everything you need to buy to cheaply make a good bleed valve. Search for it. Type "SFMU Bleed Valve" and find the one with me as the author.

  
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Eclipse2NRDec-15-03 07:33 AM
Member since Nov 25th 2002
581 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
#62225, "RE: Fuel Pressure"
In response to Reply # 9
 Dec-15-03 07:34 AM by Eclipse2NR

          

Double Post Edit

  
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gilee_8Dec-15-03 10:33 AM
Member since Jun 11th 2002
1441 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
#62233, "RE: Fuel Pressure"
In response to Reply # 11



          

LOL..I know I know.
sorry guys..>I feel stupid ok.
After all the engine rebuilt and turbo charging....I tell everyone how easy things are...
but I just DON"T KNOW how the STUPID fuel system works.
SORRY..
And yes...I made my own bleed value yesterday already.
Thanks thou!

I hope I won't have to ask anymore fuel problem related issues later ok!
Gil:thumbsup

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior


$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

  
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