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Author
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Topic: enough fuel for 10-12lb of boost?
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Glenn
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Member # 520
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posted
 
 
I currently have a 255lph in tank, and I am going to be adding a blower soon. I am stepping up to 42lb injectors. Now will that be enough fuel delivery for 12lb's of boost? Stock rails, and lines. I have all the bolt ons, 306/ H,C,I. Thanks.
[ February 23, 2004, 11:35 AM: Message edited by: Glenn ]
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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Coyoteswapfox92
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Member # 4057
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posted
Do you bolt-ons?
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1992 Coyote project under construction.
Posts: 1051 | From: Yuba City, Ca | Registered: Jan 2004
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Glenn
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Member # 520
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posted
yes
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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the50ho
THE50HO
Member # 73
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posted
I would seriously consider using an inline pump of some sort.
Many people use a t-rex pump, others prefer bosch inlines.
I will be using a t rex on mine, where as rob (5lvenom) has a different route in mind.
Either way I'd DEFINATELY consider using a nice inline, if for nothing else, safety. 12psi is a healthy amount of boost man, the last thing you want to do is not have enough fuel under boost.
Also, is your 255 standard or the high pressure model??
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Too many motorcycles...and now a destroyed arm from Motocross...brrraaappp
Posts: 4056 | From: Roseville, Ca (Sacramento) | Registered: Nov 2000
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Glenn
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Member # 520
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posted
quote:
Originally posted by the50ho:
I would seriously consider using an inline pump of some sort.
Many people use a t-rex pump, others prefer bosch inlines.
I will be using a t rex on mine, where as rob (5lvenom) has a different route in mind.
Either way I'd DEFINATELY consider using a nice inline, if for nothing else, safety. 12psi is a healthy amount of boost man, the last thing you want to do is not have enough fuel under boost.
Also, is your 255 standard or the high pressure model??
high pressure
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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Glenn
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Member # 520
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posted
what would be beter the t rex, or bosch.
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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1SLOWLX
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Member # 558
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T-rex= ![[BS flag]](graemlins/bs_flag.gif) mine blew out in like 500 miles or so. I wouldn't use a T-rex
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Built Tuff with your stuff ;)
Posts: 5231 | From: bay area | Registered: Nov 2001
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Rob [5LVENOM]
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Member # 2282
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posted
I think it is a misconception to use a T-Rex inline, unless you have a stock in-tank. I know alot of people use them in conjunction to a larger in-tank pump, and it works for some, but it didn't for me. I believe the T-Rex actually became a restriction in the fuel system up top, and the HP255 couldn't push enough fuel through it. I will be going with just the HP255, 42s no FMU, stock lines and stock 95 rails, next dyno, but I do think I'm going to have fuel issues, we'll see, if so its ALL getting replaced. BTW I plan on seeing 14-16 psi.
[ February 23, 2004, 12:03 PM: Message edited by: 5LVENOM ]
Posts: 421 | Registered: Jan 2003
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Glenn
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Member # 520
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posted
quote:
Originally posted by 5LVENOM:
I think it is a misconception to use a T-Rex inline, unless you have a stock in-tank. I know alot of people use them in conjunction to a larger in-tank pump, and it works for some, but it didn't for me. I believe the T-Rex actually became a restriction in the fuel system up top, and the HP255 couldn't push enough fuel through it. I will be going with just the HP255, 42s no FMU, stock lines and stock 95 rails, next dyno, but I do think I'm going to have fuel issues, we'll see, if so its ALL getting replaced. BTW I plan on seeing 14-16 psi.
cool, i think I will stick with the 255 in tank for now, and see if that is enough. thanks.
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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AaronC
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Member # 86
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posted
I've been told the T-Rex is a 190 lph fuel pump. In that case it would be a restriction with a 255 high pressure in tank pump. If you get an inline pump get the 255 lph inline ![[Wink]](wink.gif)
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1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers
12.23 at 112.99
Best MPH 113.97
Posts: 776 | From: woodland | Registered: Dec 2000
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98slowhoe 'FIFTYLX'
Uncle Frank
Member # 895
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posted
quote:
Originally posted by AaronC:
I've been told the T-Rex is a 190 lph fuel pump. In that case it would be a restriction with a 255 high pressure in tank pump. If you get an inline pump get the 255 lph inline
Exactly! go with a 255 inline and you will be good to go man!
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AKA Franky Freaking 5 liter
Advanced Engine Development
SCT dealer
Dynotuning
Engine building
916*275*8212
88 4runner on 42's
Posts: 4206 | From: Folsom | Registered: Feb 2002
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93PONY
Mr. Valve Events
Member # 60
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posted
Walbro GSS392 255 high-pressure in-line pump is what I use along with a GSS307 Standard pressure 255 in-tank. With -6 fuel lines & aftermarket rails, this setup has no problems keeping up with the demands of my motor.
These 2 pumps with stock lines/95 rails would be good for 500RWHP at up to 60psi FP.
BTW, 2 pumps does NOT mean twice the flow! It's insurance for lack of volume at high RPM. By most online fuel calculators, 190lph flow is all that is required for 500RWHP.....but typically a 190lph in-tank pump can not be pushed that hard. I've seen 190lph in-tank + T-rex setups push over 500RW with aftermarket fuel lines.
It's all about the restrictions in your system & how much volume your setup can flow at the fuel presure needed.
Anybody ever check the stock-type fuel filter inlets/outlets? Typically they measure .190 (less then 1/5th inch) Inner Diameter. There are several other resrictions like this in the stock setup. Eliminate these restrictions & you'll be able to push more fuel to your injectors.
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000
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jmcclesk
Moderator
Member # 1355
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posted
![[patriot]](graemlins/patriot.gif)
[ February 23, 2004, 04:53 PM: Message edited by: jmcclesk ]
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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4RS FED
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Member # 2067
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posted
or you could put an external pump and buy my sumped gas tank ![[Whoo Whooooo!]](graemlins/woowoo.gif)
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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THE King Cobra
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Member # 2011
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posted
I learn something new everyday...thanks 93PONY ![[Big Grin]](biggrin.gif)
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RPM Racing Team
-96 Cobra. HCI MOTORSPORTS block
-More cops in the family = more write-offs
508 RWHP @10.0lbs @6100 RPM..wait till I hit 8K RPM's
Posts: 315 | From: Bay Area, CA | Registered: Oct 2002
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jmcclesk
Moderator
Member # 1355
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posted
Actually the biggest restriction (smallest size) is in the fuel block just past the the inlet on the fuel rail. i cut one open once and is in the area of .110-.120 if i rember correctly.
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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93PONY
Mr. Valve Events
Member # 60
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posted
quote:
Originally posted by jmcclesk:
Actually the biggest restriction (smallest size) is in the fuel block just past the the inlet on the fuel rail. i cut one open once and is in the area of .110-.120 if i rember correctly.
Yep!
I knew it was the biggest restriction....just didn't know it was THAT bad! ![[Eek!]](eek.gif)
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000
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AaronC
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Member # 86
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posted
Hey Jon, have you ever measured a 94/95 rail opening? I've heard they're bigger. A lot of blower guys use this as a cheap rail swap. Just wondering how much bigger they are.
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1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers
12.23 at 112.99
Best MPH 113.97
Posts: 776 | From: woodland | Registered: Dec 2000
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jmcclesk
Moderator
Member # 1355
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posted
Never cut one open. The general thought is that the 94-95 is a better rail. (Bigger openings) not sure how much biger though.
[ February 24, 2004, 06:08 PM: Message edited by: jmcclesk ]
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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