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Old 03-10-2007, 08:39 AM   #1
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Fuel Pump FAQ

What are the OEM fuel pump sizes?
2002-2005 WRX fuel pump 130 lph
2006-2007 WRX fuel pump 145 lph
2008+ WRX fuel pump 155 lph
2004-2007 STI fuel pump 145 lph
2008+ STI fuel pump 175 lph

What is the best fuel pump? The most commonly used fuel pump is the Walbro 342 fuel pump. It is a drop in unit that supports most aftermarket turbo fueling requirements. Other fuel pumps that are commonly used are:
a. Walbro 341 fuel pump. Functionally identical to the 342. Requires slight modification for use.
b. DeatschWerks
d. Aeromotive fuel pump. Generally for high HP applications only though.

Can I use XXX brand fuel pump? Most likely yes, but you should refer to the manufacturer's website for sizes and compatibility as the above listed brands are the commonly used ones today in the Subaru community.

What about the 08+ WRX/STI? There have been changes to the fuel pump on these models over to the Legacy style pump, so they are no longer "plug and play" swaps like previous models. There is a DIY option to do this as well and it can be found via this link.

Is there anything to look out for with fuel pumps? When using aftermarket fuel pumps, many re-use the stock WRX fuel pump filter. This filter contains a hard plastic skeleton inside to prevent the pump from ingesting the soft "bag filter". Aftermarket pumps do not have the hard plastic part, and many users enjoy the additional safety that the OEM filter provides over the aftermarket fuel pump's filter.

Do I need to tune for a fuel pump? No.

Can I run an aftermarket fuel pump by itself without new injectors/turbo/management? During the turbo upgrade path, it may be easier to purchase and install a fuel pump ahead of time. It is cheap, easy to install, and removes an eventuality from the upgrade chain ahead of time. You can run an aftermarket fuel pump with no other modifications. Adding a fuel pump will not give you more fuel (i.e. richen your car), it simply allows for more fuel to be delivered if you run higher boost or larger injectors. The stock RRFPR keeps the pressure at the stock 43 psi + manifold pressure no matter how much fuel may be available from the pump.

How hard is it to install a fuel pump? Allow around one hour for install time. Professional installation, depending on your area, is around $75. This is one vehicle modification that is very simple and can be successfully accomplished by even the greenest shade tree mechanic. Kroger Ad and its subsidiaries have got the best offers of digital coupons.

How do I install a fuel pump? Refer to the fuel pump manufacturer's instructions. For fuel pumps without instructions, below is are some links to some of the better known fuel pump installation instructions:

scoobymods.com instructions
scoobymods.com instructions
scoobymods.com instructions
TurboXS's instructions
Quantum Racing's instructions
Fuel pump install for 08+

Injector FAQ

What are the best fuel injectors? Fuel injectors should be purchased based on the best possible match between the flow rating and needs of your aftermarket turbo. This should be a determination by your tuner to provide the best possible match. It is better to opt on the side of too large if there is any possibility of maxing out the injectors with your upgrade plans. Bigger is not always better with injectors so it is always best to purchase injectors best suited for your application and upgrade as need as opposed to starting off too large. This online calculator may assist you in the decision process. This post by hotrod will also help. As well, ask your tuner for his recommendation on brands. It will be cheaper to buy the brand he is familiar with rather than wasting dyno time + tuner fees while he fiddles around with your rogue brand/size injectors! ALWAYS take your tuner's advice on these matters no matter what the internet tells you!

What type of injectors do I need? Aside from matching the injector flow for your turbo/tuning needs, you need to get the correct type for your vehicle:

02+ WRX uses high impedance top feed injectors
04-06 STI uses high impedance side feed injectors (also called bottom feed)
07+ STI uses high impedance top feed injectors

What is the difference between low and high impedance? Low impedance injectors need to be electrically adapted to work properly, and usually come with the required electronic components for this.

Do I need to consult with my tuner about injectors? Yes. Items in your car that can be tuner specific: manual boost controllers, electronic boost controllers, upgraded wastegates, restrictor pills, wastegate helper springs, external wastegates (type/size/brand), and injector types/brands/sizes. ALWAYS take your tuner's advice on these matters no matter what the internet tells you!

Can I run a aftermarket injectors without tuning? No. You MUST have your car tuned during the installation process. Most tuners can send you a "limp map" based on your mods to tide you over during the break-in period or to get you to their shop for a tune days or weeks later. This map will be safe, but you should drive like your car is a 1990 Ford Escort until your final tune.

The map notes from XXX tuning company say pinks, but 06 injectors flow the same so can't I use them? No. Don't think you can out-think a tuner. If you have a question, ASK FIRST. As above, don't trust the internet, trust your tuner.

Are there any cautions with injectors? UTEC (older engine management system) users should be aware that they should not use low impedance injectors.

What are IDCs? The injector duty cycle is the proportion of time that the injector is open, squirting fuel. When choosing injectors, many try to choose an injector size to place IDCs in the 85-90% range. This assures proper fueling with a little bit of headroom.

Is there a list of top feed injector sizes for the 2002+ WRX and 2007+ STI?

OEM 2002-2005 WRX 420 cc
JDM STi "pinks" 550 cc
OEM 2006+ WRX 560 cc (also known as "blues")
OEM 2007+ STI 560 cc
DeatschWerks 565 cc
DeatschWerks 650 cc
RC Engineering 650 cc
Fuel Injector Clinic 650 cc
Injector Dynamics 725 cc
DeatschWerks 750 cc
RC Engineering 750 cc
Fuel Injector Clinic 775 cc
Modified Stock WRX 850 cc
DeatschWerks 850 cc
Injector Dynamics 850 cc
Fuel Injector Clinic 900 cc
DeatschWerks 1000 cc
Injector Dynamics 1000 cc
Fuel Injector Clinic 1050 cc
Fuel Injector Clinic 1100 cc
DeatschWerks 1300 cc
Injector Dynamics 1300 cc
Injector Dynamics 2000 cc
Fuel Injector Clinic 2150 cc
DeatschWerks 2200 cc

Is there a list of side feed injector sizes for the 2004-2006 STI?

OEM 2004-2006 STi 535 cc
RC Engineering 650 cc
Fuel Injector Clinic 650 cc
Injector Dynamics 725 cc
DeatschWerks 740 cc
RC Engineering 750 cc
Fuel Injector Clinic 775 cc
Modified Stock Injectors 817 cc
DeatschWerks 850 cc
Injector Dynamics 850 cc
Fuel Injector Clinic 900 cc
DeatschWerks 1000 cc
Injector Dynamics 1000 cc
Fuel Injector Clinic 1100 cc
Injector Dynamics 1300 cc
Injector Dynamics 2000 cc
Fuel Injector Clinic 2150 cc

Can I use XXX brand injectors? Most likely yes, but you should refer to the manufacturer's website for sizes and compatibility as the above listed brands are the commonly used ones today in the Subaru community.

Who manufactures injectors?

DeatschWerks (also known as DW Injectors)
Fuel Injector Clinic (also known as FIC Injectors)
Injector Dynamics (also known as ID Injectors)
RC Engineering

Can I modify stock 02-05 WRX injectors for increased flow? Yes, though this route requires additional research, thought, time, and care than purchasing larger injectors.

600 cc injectors
740 cc injectors (Though this is the thread title and commonly known name, these modified injectors actually flow 850 cc when tested at the normal static fuel pressure of 43psi)

Can I modify stock 06+ WRX injectors or STi pinks for increased flow? Yes, but that would be a dumb move. These babies go for like $300 used. Sell them, buy 02-05 WRX injectors for like $150 and have them modded.

Are there any other mods to increase flow? Yes, you can modify your stock FPR when using an aftermarket fuel pump to increase the cc rate of your existing injectors. View this thread or this thread for details.

How hard is it to install fuel injectors? Allow around two hours for install time. Professional installation, depending on your area, is around $150. This vehicle modification more difficult and time consuming than most "bolt on" installations.

How do I install fuel injectors? Refer to the fuel injector manufacturer's instructions. For fuel injectors without instructions, below is a link to one of the better known fuel injector installation instructions:

TurboXS's instructions
Useful NASIOC thread
2011 WRX injector install instructions


Fuel Rail FAQ

What are fuel rails? Aftermarket fuel rails are designed to increase the internal diameter of the stock fuel lines as well as convert the OEM fuel rail set up from series to parallel. The theory behind these two changes is to increase fuel flow and equalize fuel distribution.

When are fuel rails needed? This is a very hard question without a clear answer as it varies from tuner to tuner, but GENERALLY speaking, once you are on the road to over 400WHP, fuel rails become a viable option, but consult with your tuner for the best answer. Additionally, if you are a show car type person, you may find that fuel rails improve the look under the hood as a reason for this modification, which is fine, but do know that they require tuning to operate.

Are there any fuel rail myths? Yes. Many years ago, it was theorized by some that the stock serial layout fuel lines caused a lean cylinder condition which carried away the #3 or #4 piston (depending on what story you believe) and that fuel rails with their parallel layout would cure this. After time though, this theory has been generally disregarded save for a few curmudgeons.


Who manufactures fuel rails?

Aeromotive
Crawford Performance
Fuel Injector Clinic
Perrin Performance
Rocket Rally Rails
TurboXS
Ultimate Racing
Boomba Racing

Can I use XXX brand fuel rails? Most likely yes, but you should refer to the manufacturer's website for sizes and compatibility as the above listed brands are the commonly used ones today in the Subaru community.

Is there a "fuel rail mod"? Yes. Many have modified their stock fuel rails into parallel fuel lines and/or parallel with bigger lines.

scoobymods.com instructions
supporting/supplemental NASIOC thread
supporting/supplemental NASIOC thread

How hard is it to install fuel rails? Allow around six hours for install time. Professional installation, depending on your area, is around $400. This vehicle modification is more difficult and time consuming than most "bolt on" installations.

Do I need to tune for a fuel rails? Yes, due to the change in fuel rail diameter they will flow more to your injectors than the stock rails.

How do I install fuel rails? Refer to the fuel rail manufacturer's instructions. For fuel rails without instructions, below are some links to installation instructions:

Perrin's instructions
Perrin's instructions
APS's instructions
Vishnu's instructions
Mike Egan's instructions
Jorge's instructions

Editors Note

This post was created because I wasn't able to find a good FAQ on these parts. I came up with the text based on LOTS of searching here. Upon reading this you should have an idea of what type of fuel supporting modifications best suit your needs. The types and manufacturers are up to you.

If you find an error in this FAQ, please PM me with factual details and I will update this post. Responses such as, "I have XXX's injectors and they are great!" or "XXX's fuel rails cracked after 1 month" are not appreciated here, that is what the Car Parts Review Forum is for.
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Old 03-10-2007, 08:39 AM   #2
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This post has been broken out of the old Turbo FAQ based on your input to make it easier to find. I'm going to update it slightly today and check all the links, then add this to my Manifesto and delete the old Turbo FAQ post with something bigger and better.
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Old 03-10-2007, 10:43 AM   #3
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I have said it before and I will say it again... this site rocks! Excellent write up. This is exactly the info I needed. Many thanks.
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Old 04-11-2007, 01:56 AM   #4
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Something that is left unclear is the diference between side-feed and top-feed injectors.

Can I use STi pinks on my 05 wrx even if one is SF and the other TF?
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Old 04-11-2007, 02:12 AM   #5
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Great info ...missing a little like the nismo740's side feed, but then we could go on all day about whose injectors and sizes. Overall I give this FAQ a thumbs up
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Old 04-24-2007, 05:49 PM   #6
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Excellent FAQ!!

Quote:
Originally Posted by blindstuff View Post
Something that is left unclear is the diference between side-feed and top-feed injectors.

Can I use STi pinks on my 05 wrx even if one is SF and the other TF?
I also am unclear of the difference between side-feed and top-feed injectors.
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Old 04-24-2007, 06:37 PM   #7
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Quote:
Originally Posted by Nilesh View Post
Excellent FAQ!!



I also am unclear of the difference between side-feed and top-feed injectors.
Its the relation of the fuel rail attachment. There are ways to convert side feed to top feed since generally top feed as the easiest to find in large sizes. But I havent seen anyone on this forum do it, dont know if its possible but on some vehicles it is...

WRX's have top feed STI's have side feed.
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Old 04-24-2007, 11:29 PM   #8
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does anybody know if i can use a STI fuel pump when going to the vf39 upgrade on my wrx rather than buying the walbro. u can find used sti pumps for around 50 bux...while walbro's are double that. thanks
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Old 04-24-2007, 11:48 PM   #9
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No you cannot. 15 more lph is not going to cut it and the STI fuel pump is NOT considered an upgrade whatsoever over what you have.
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Old 04-26-2007, 01:05 PM   #10
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Hey, I was just googling Walbro pumps and found this interesting article about forgeries that are being made overseas!

http://www.exelife.com/blog/automoti...-who-knew.html

A little FYI
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Old 04-26-2007, 05:10 PM   #11
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Default Do i need upgrades

I have a 02 wrx with a header, up pipe and full 3 inch exhaust, aps intake with k&n, deadbolt tdo5 16g turbo and just recently bought a turbo xs boost controller and i was wondering how much boost i could run with out leaning out my motor or if i should get injectors and fuel pump next...? Anyones opinions or expieriences would help thanks...!
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Old 04-26-2007, 05:17 PM   #12
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tuner's tend to know this info... u are tuned, correct?
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Old 04-27-2007, 12:13 AM   #13
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thanks unabomber. i didn't think so but just thought i would ask.
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Old 04-27-2007, 01:23 PM   #14
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Quote:
Originally Posted by Rfred View Post
I have a 02 wrx with a header, up pipe and full 3 inch exhaust, aps intake with k&n, deadbolt tdo5 16g turbo and just recently bought a turbo xs boost controller and i was wondering how much boost i could run with out leaning out my motor or if i should get injectors and fuel pump next...? Anyones opinions or expieriences would help thanks...!
Has your car been tuned? Cuz you should definately get one with those mods. Also you should get injectors and a fuel pump
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Old 04-27-2007, 10:26 PM   #15
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No it hasnt yet im going to get the fuel pump and injectors then i will have it tuned..
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Old 05-15-2007, 05:48 PM   #16
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regarding the sti fuel pump unabomber if an sti dyno tuned with over 300whp is fine with a stock pump why wouldn't a ej205 wtih a vf39 with the same mods be more then enough. Im not arguing what your saying just would like to question your reasoning of a 2.5ltr motor and vf39 not needing the bigger pump but a 2.0 and the 39combo needing it? thanks in advance.

Scott
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Old 05-23-2007, 12:23 AM   #17
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what about my stock FPR.... do I need to upgrade ?

sti? ......I have heard the SVX regulator is a good one to use for us old school Impreza guys...
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Old 05-23-2007, 11:17 AM   #18
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Might want to add a note about Power Enterprise 650cc and 800cc injectors being a little different to tune with, since they have a dual-stage feed system. Would probably be worth double-checking with your tuner to make sure he is comfortable tuning with them before selecting them, although they're supposed to idle better than some of the other big injectors.
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Old 05-30-2007, 04:17 PM   #19
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this thread found below perked my interest in knowing whether or not a tune and/or EM is necessary on an otherwise stock WRX when installing rails, particularly when done to help rid one's self of the cold raw fuel smell issue:

http://forums.nasioc.com/forums/show....php?t=1274333

the different opinions in both post 3 and post 8 are what bring my question about.
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Old 07-08-2007, 06:08 PM   #20
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I'd put this in one of the Scoobymod DIY's but I can't add a reply to them for some reason. They must be locked or something.

In my WRX wagon, there was no need to remove the back seat. The fuel pump access cover is located just behind the back seat. Fold the pass. side back seat down and remove the trim piece that's located directly behind the back seat. You'll then see the access cover.

Also, as Unabomber mentions in his the original post, the Walbro 342 is pretty much plug n play. No cutting necessary as far as I am concerned. It installs in the same configuration as the stocker but since it's longer, it's output nipple pushes up against (and slightly inside) the hard metal line (nipple). Seems like a perfect fit to me. Fuel should shoot right out of the pump up into the hard metal line. The stock rubber fuel line and hose clamps work just fine for sealing it up or use the hose and clamps that came with the pump.

Oh and one last suggestion. If you let the car die by unplugging the white plug on top of the access cover, crank it over for like 5 seconds afterward. I had hardly any fuel come out of the hoses and I attribute that to waiting a minute and then trying to start the car again after letting it die.
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Old 08-04-2007, 09:23 PM   #21
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if I put an JDM STi Spec-C intake with fuel rail on an 06 WRX TR will I need new injectors?
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Old 08-15-2007, 05:14 AM   #22
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I'm also curious as to the diff between side- and top-feed injectors.

I understand the differences mechanically (i.e. where the fuel comes from and how they're set up, etc.), but my concern is whether one type may be a better choice than the other, and why.

If it helps any for my personal case, I have an 02 WRX sedan with no mods currently, other than a lightened flywheel. I plan to do basic bolt-ons and upgrades (UP and TBE, EM, and maybe a turbo upgrade). But it would be greatly appreciated if you could include something to help us make a choice (ie for street and light track, maybe up to 300-350whp, use ______, and use ______ for balls-to-the-wall drag or other high hp apps).
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Old 09-13-2007, 11:27 PM   #23
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correct me if im wrong but wouldnt an injector hitting a duty cycle of 85-90***37;not have proper cool down time and lead to failure? all the research ive ever done have put duty cycles at max 80-85%, anything more than that would require an up size. not trying to say your wrong just wondering. I can give where i got the info if anyone is wondering.
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Old 09-14-2007, 11:42 AM   #24
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Excellent job as usual. I do have one question on the STi pinks though. You've got them listed as 550cc and on Cobb's map page they're listed as 565cc. Are there 2 different top feed models? Or, is the 15cc just within the tolerances?
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Old 09-14-2007, 02:38 PM   #25
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There is no possibilty that the OEM 07 injectors are 535cc.

These injectors supported an 18G at 19PSI on my 07 FXT (which uses the same injectors) without a problem.

The 07 top feeds (no idea if the 06 are the same) are the largest Subaru has made here in the states.
And pinks are 540cc from the tests I have seen.
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