Welcome to the North American Subaru Impreza Owners Club Sunday July 13, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-19-2005, 07:19 PM   #1
calib17a
*** Banned ***
 
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default repost: My Twin Walbro 255 Fuel Pump Set up. Pictures and Info

Originally posted in 2.0 powertrain by STEALTH-WRX , but it's important enough to post in 2.5 forum.
Link to original post: http://forums.nasioc.com/forums/show...0#post10785850
I was thinking about doing this since I'll be installing my gt35r. Anyone have any updates or tips?

Here are pics from the origional post:





* Registered users of the site do not see these ads.

Last edited by calib17a; 08-19-2005 at 07:29 PM.
calib17a is offline   Reply With Quote
Old 08-19-2005, 07:23 PM   #2
djerickd
Scooby Guru
 
Member#: 3782
Join Date: Jan 2001
Chapter/Region: South East
Location: Tampa B*tch!
Vehicle:
02 WRX WFC#040
Clean on 19's

Default

Got fuel? Jeez!

At what point do you need that much fuel? 500/600hp?
djerickd is offline   Reply With Quote
Old 08-19-2005, 07:26 PM   #3
calib17a
*** Banned ***
 
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default

I had talked to Clark @ Kingpin a while ago and he had told me gt35r setups with a single walbro 255lph ran out of steam when reaching the upper limits of 500+ hp range, so they recommended running twin 255 lph walbros to compensate for the needed fuel delivery. You don't want take chances with fuel starvation at those power levels.
calib17a is offline   Reply With Quote
Old 08-19-2005, 09:24 PM   #4
mavrick
Scooby Newbie
 
Member#: 78477
Join Date: Dec 2004
Location: Under the hood...
Vehicle:
04 Element block
Hydra pwrd t67

Default

dumb question they both feed one fuel line??
Dustin
mavrick is offline   Reply With Quote
Old 08-19-2005, 09:57 PM   #5
import111
Scooby Specialist
 
Member#: 24447
Join Date: Sep 2002
Chapter/Region: SWIC
Location: Tucson, Arizona
Vehicle:
2010 Evo GSR
GG

Default

Isn't there a single fuel pump that flows more than 255lph so you would only need 1 pump instead of 2?

Ryan
import111 is offline   Reply With Quote
Old 08-19-2005, 09:59 PM   #6
calib17a
*** Banned ***
 
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default

I believe Walbro has a 310 lph fp, but two 255 lph fps flow more.
calib17a is offline   Reply With Quote
Old 08-19-2005, 10:53 PM   #7
949
Scooby Specialist
 
Member#: 58906
Join Date: Apr 2004
Default

so i guess fuel prices isnt a factor here.

wouldnt you run out of gas at about 120 miles/per tank? our tanks are not that big. i do about 240 miles with almost stock and conservative driving.
949 is offline   Reply With Quote
Old 08-19-2005, 11:09 PM   #8
StiDreams
Scooby Specialist
 
Member#: 26315
Join Date: Oct 2002
Chapter/Region: BAIC
Location: On the grassy knoll.
Vehicle:
07 Outback
Silver/Silver

Default

I'm guessing that gas prices is not one of your concerns when building a 500+ hp car.
StiDreams is offline   Reply With Quote
Old 08-20-2005, 01:15 AM   #9
mpj_becks
Scooby Specialist
 
Member#: 6265
Join Date: May 2001
Chapter/Region: BAIC
Location: Hayward, CA
Default

You'll need to sort the voltage supply out before you'll need dual pumps but your right you'll need more fuel than a single Walbro will provide on a solid GT35 tune.
mpj_becks is offline   Reply With Quote
Old 08-20-2005, 01:17 AM   #10
offset
Scooby Guru
 
Member#: 32636
Join Date: Feb 2003
Chapter/Region: MWSOC
Location: Dayton, OH
Vehicle:
2004 Impreza STi
Silver/Silver

Default

I am also guessing that you don't plan on using any sort of WI/AI?

offset
offset is offline   Reply With Quote
Old 08-20-2005, 03:06 AM   #11
calib17a
*** Banned ***
 
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default

I'm injecting propane.
calib17a is offline   Reply With Quote
Old 08-20-2005, 01:12 PM   #12
x99percent
Scooby Specialist
 
Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
Vehicle:
2004 STi
2004 A4

Default

Quote:
Originally Posted by 949
so i guess fuel prices isnt a factor here.

wouldnt you run out of gas at about 120 miles/per tank? our tanks are not that big. i do about 240 miles with almost stock and conservative driving.
The number of fuel pumps has little to do with how much fuel is actually used.
x99percent is offline   Reply With Quote
Old 08-20-2005, 02:47 PM   #13
AntiochCali
Scooby Specialist
 
Member#: 30185
Join Date: Nov 2002
Location: Antioch, California
Vehicle:
2003 320 whp
on a heatbreaker dyno

Default

Mike, tuner at Gruppe-s did this recently.

I think it is post #68

i-club.com/forums/showthread.php?t=70100&page=4&pp=20
AntiochCali is offline   Reply With Quote
Old 08-20-2005, 09:44 PM   #14
offset
Scooby Guru
 
Member#: 32636
Join Date: Feb 2003
Chapter/Region: MWSOC
Location: Dayton, OH
Vehicle:
2004 Impreza STi
Silver/Silver

Default

Quote:
Originally Posted by calib17a
I'm injecting propane.
How are you tying in the propane? I would think with that you could get away with a lot less fuel than what two pumps could push. What injectors are you going with also?

offset
offset is offline   Reply With Quote
Old 08-21-2005, 12:24 AM   #15
calib17a
*** Banned ***
 
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default

I'm using Utec's auxilary solenoid control. I have it set at 2300 rpms @ -4 psi of boost to turn on propane solenoid. I'm using Perrin 816cc modified sti injectors. I might as well do it before the tune.
calib17a is offline   Reply With Quote
Old 08-21-2005, 10:54 AM   #16
awilson529
Scooby Specialist
 
Member#: 38867
Join Date: Jun 2003
Location: Houston, Tx.
Vehicle:
11 Mazda

Default

Why not just do an H2O or meth setup and run leaner EGT & have more power?
awilson529 is offline   Reply With Quote
Old 08-24-2005, 05:46 PM   #17
SLPRSTI
Scooby Newbie
 
Member#: 94355
Join Date: Aug 2005
Location: 750cc injectors
Vehicle:
2004 STI
JAVABLACK

Default

i just went through the same question in my mind. yes you will have to refuel all the time with the stock tank. the 255 pump as a twin will work but its kinda hokie. what i did was put a summit 22gallon foam cell and a sx 1200 to 1000 hp inline pump in with dash 12 hard lines to the perrin rails. hey awilson529 you are rite meth2water injection is worth every penny. when you dont want to pay for C16 fuel or even the cheaper epa legal 100 at 76 station you can make the methanol compisate for the loss of octain. thats what i do on ecutek. i post pics soon since the car is apart.
SLPRSTI is offline   Reply With Quote
Old 08-24-2005, 06:00 PM   #18
8Complex

Moderator
 
Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
Vehicle:
04 FXT
Red

Default

Why not do the intelligent thing and run a single external pump that CAN flow enough for your setup?


BTW, interested in hearing more about the propane setup. I've loved the idea for a while now.
8Complex is offline   Reply With Quote
Old 08-24-2005, 07:30 PM   #19
StiDreams
Scooby Specialist
 
Member#: 26315
Join Date: Oct 2002
Chapter/Region: BAIC
Location: On the grassy knoll.
Vehicle:
07 Outback
Silver/Silver

Default

I'm going to go out on a limb here and guess that an SX1200, 20 gallon foam fuel cell and -12 hard lines plus fittings are not in the same cost arena as putting in a walmart pump, slapping together a couple of fittings and some lines or better yet just swapping the return and supply line. Cheap is not always right but sometimes itís good enough. But for this hobby right is almost never cheap.
StiDreams is offline   Reply With Quote
Old 08-24-2005, 07:41 PM   #20
Nixlimited
Scooby Newbie
 
Member#: 86730
Join Date: May 2005
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2005 STi
460 WHP @ 28 PSI

Default

OK, I am stupid, what are the pillow looking things at the bottom of the pumps. My guess is some sort of sponge to keep sloshing from starving the fuel lines, but I have no idea.
Nixlimited is offline   Reply With Quote
Old 08-25-2005, 12:07 AM   #21
metoo
Scooby Guru
 
Member#: 4764
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston
Vehicle:
2004 STi sold :(
forizzle

Default

Quote:
Originally Posted by Nixlimited
OK, I am stupid, what are the pillow looking things at the bottom of the pumps. My guess is some sort of sponge to keep sloshing from starving the fuel lines, but I have no idea.
Filters. These are not the main fuel filter.

When I changed my pump, I saw lots of metal flakes built-up on the filter. It really worried me until I figured where the flakes came from......fuel pumps nozzles at the gas station.
metoo is offline   Reply With Quote
Old 08-25-2005, 01:09 AM   #22
AZScoobie
Scooby Guru
 
Member#: 8785
Join Date: Jul 2001
Chapter/Region: SWIC
Vehicle:
02 c_turner@ix.
netcom.com

Default

Hey guys. Yes.. we run Dual pumps. The main reason is simple. I dont need Double the flow of twin walbros. What I need is more fuel at high boost pressures. I need more fuel at 60-80 psi of fuel pump pressure. Most intake pumps really die off up here. In this situation you can do several things..

Larger injector ... Not an option for us with Utec
Larger fuel lines... Do not believe in doing this on a street car
Larger pump... Have not been able to find one that bolts in.

The HKS 310 pulls ALOT and if you search the net you find that it really does not fit our needs. I do not believe in running external SS lines all the way up on a customers street car. I believe the stock lines are safer and built and run in a manner to not break in a sever crash. You might be ok with this but I am not. Its just like I dont believe in running R compound tires on a car without a roll cage and I dont believe if driving in a car with a roll cage without a helmet. I guess I am a scaredy cat. The solution I came up with was simple and cheap.. Add a second walbro. A walbro pulls 7 amps. A supra pump or HKS pump pulls 14 amps or twice a walbro. Add two, problem solved, you spent a little cash and your car is safe.

Clark
AZScoobie is offline   Reply With Quote
Old 08-25-2005, 04:13 AM   #23
Gruppe-S
Former Vendor
 
Member#: 23216
Join Date: Aug 2002
Location: Lake Forest, CA | 949-457-1234
Vehicle:
2006 949-457-1234
949-457-1234

Default

Quote:
Originally Posted by djerickd
Got fuel? Jeez!

At what point do you need that much fuel? 500/600hp?
At about 440whp on our dyno.

Cheers,

Gary
Gruppe-S
Gruppe-S is offline   Reply With Quote
Old 09-18-2005, 09:54 PM   #24
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

subscribe
silver arrow is offline   Reply With Quote
Old 09-18-2005, 10:07 PM   #25
tino
Top Scoob 019
 
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:
2004 GT40R-built 2.5
604 whp @1.8 BAR on VP109

Default

Quote:
The HKS 310 pulls ALOT and if you search the net you find that it really does not fit our needs. I do not believe in running external SS lines all the way up on a customers street car. I believe the stock lines are safer and built and run in a manner to not break in a sever crash. You might be ok with this but I am not. Its just like I dont believe in running R compound tires on a car without a roll cage and I dont believe if driving in a car with a roll cage without a helmet. I guess I am a scaredy cat. The solution I came up with was simple and cheap.. Add a second walbro. A walbro pulls 7 amps. A supra pump or HKS pump pulls 14 amps or twice a walbro. Add two, problem solved, you spent a little cash and your car is safe
Clark was wondering will the increase in amps cos a fuse to blow? Have u found any problems with overheating of the pumps over long bursts?

Have u seen any pumps fail? Wot would be needed to remedy this?

I was wanting to go down this path but im a lil unsure now
tino is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
565cc blue injectors and Walbro 255 fuel pump for my 02 WRX 02wrxroger Factory 2.0L Turbo Powertrain 9 04-09-2010 05:33 PM
For Sale RC Engineering Injectores 440cc and Walbro 255 fuel pump blaznc Engine/Power/Exhaust 4 02-10-2007 11:45 PM
My Twin Walbro 255 Fuel Pump Set up. Pictures and Info STEALTH-WRX Factory 2.0L Turbo Powertrain 14 02-09-2006 03:22 PM
FS: STI pink injectors and Walbro 255 fuel pump nimaxpro Private 'For Sale' Classifieds 9 10-19-2005 11:05 PM
Walbro 255 fuel pump and a header for a STI bottlediger Private 'Wanted' Classifieds 0 03-26-2005 10:51 PM


All times are GMT -4. The time now is 09:24 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.