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Old 06-03-2017, 12:45 AM   #1
whiterabbitrexy
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Default ej20k side 2 top feed fuel rail,hose,fpr set up

so yeah im wanting to upgrade to the v7 sti top feed injectors that my freind gave me for free with only 86thousand km on it......

but i have a ej20k with side feed set up and wanting to change to top feed...

the fuel rails are abit hard to find specific for my intake manifold and i wanted to know is there really any bad fuel rails to stay away from ?? so much cheap fuel rails online its not funny and i dont want to buy somthing that looks good but dosnt even fit ...


can you guys who have done a side to top feed conversion show me your set up ....

only thing im confused is the hose set up config ....so manny diffrent set ups where u have 2 fpr and others with 1 fpr and more returns from the fuel rails....
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Last edited by whiterabbitrexy; 06-03-2017 at 12:52 AM.
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Old 07-30-2017, 10:13 PM   #2
i10scooby
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Realize this is a little late, but for me I would keep the EJ20K rails and get the adapters to use the phase 2 side feeds. Adapters are only $70 from RobTune and look really nice:

http://www.robtune.com/index.php/blog/item/8-adapters

If you want to go big power with some new fuel rails, you can ask superdave as I think he did a similar custom set up on his crazy hybrid.
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Old 07-31-2017, 11:46 AM   #3
suberdave
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Here is what I did.

I made a custom adapter to fit in the manifold, then used OutFront fuel rails with modified brackets to hold them to the manifold.

The adapters are simular to these ones:
www.radiumauto.com/

The 26mm units were not on the sight when I made mine. or I would have likely just bought them. I made mine at 1.035" or 26.28mm but they could just be running a little larger O-Ring...

I am running modified OEM injectors flow tested at 980CC.



So far so good...

Just dyno tested the engine at 350AWHP 340AWTQ

-=Suberdave=-
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Old 08-02-2017, 05:45 PM   #4
elislider
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Quote:
Originally Posted by whiterabbitrexy View Post
so yeah im wanting to upgrade to the v7 sti top feed injectors that my freind gave me for free with only 86thousand km on it......

but i have a ej20k with side feed set up and wanting to change to top feed...

the fuel rails are abit hard to find specific for my intake manifold and i wanted to know is there really any bad fuel rails to stay away from ?? so much cheap fuel rails online its not funny and i dont want to buy somthing that looks good but dosnt even fit ...


can you guys who have done a side to top feed conversion show me your set up ....

only thing im confused is the hose set up config ....so manny diffrent set ups where u have 2 fpr and others with 1 fpr and more returns from the fuel rails....
Just don't bother. If you have to ask, you can't do this. Nobody makes a kit like that that I'm aware of, and you couldn't keep your stock rails anyways, you'd have to go aftermarket or convert the entire rail to a top feed kind. Then the injectors wouldn't even plug in, and even if they did, the are are completely different type (resistance, flow, etc) and you'd need to get a custom tune for them. All that just for ~550cc injectors? (I assume you have the pink top feeds if they are v7 STi)

Or you could swap your rails to USDM EJ25D rails and use USDM yellow side-feed injectors, which are also ~550cc like the jdm pink ones. You would still need a tune though.

what kind of engine management do you have?
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Old 08-06-2017, 01:13 AM   #5
whiterabbitrexy
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Quote:
Originally Posted by elislider View Post
Just don't bother. If you have to ask, you can't do this. Nobody makes a kit like that that I'm aware of, and you couldn't keep your stock rails anyways, you'd have to go aftermarket or convert the entire rail to a top feed kind. Then the injectors wouldn't even plug in, and even if they did, the are are completely different type (resistance, flow, etc) and you'd need to get a custom tune for them. All that just for ~550cc injectors? (I assume you have the pink top feeds if they are v7 STi)

Or you could swap your rails to USDM EJ25D rails and use USDM yellow side-feed injectors, which are also ~550cc like the jdm pink ones. You would still need a tune though.

what kind of engine management do you have?
crap are you serious i cant just plug in the v7 sti pink injectors to my existing injector wire cable? i have to solder the adaptor/plug ?

yeah i wasnt going to use the old oem side feed fuel rails.... i would go aftermarket fuel rails....heaps of cheap ones for top feed injectors... just need bottom addaptors/fittings for top feed injectors like superdave did
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Old 08-06-2017, 03:49 AM   #6
whiterabbitrexy
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Quote:
Originally Posted by suberdave View Post
Here is what I did.

I made a custom adapter to fit in the manifold, then used OutFront fuel rails with modified brackets to hold them to the manifold.

The adapters are simular to these ones:
www.radiumauto.com/

The 26mm units were not on the sight when I made mine. or I would have likely just bought them. I made mine at 1.035" or 26.28mm but they could just be running a little larger O-Ring...

I am running modified OEM injectors flow tested at 980CC.



So far so good...

Just dyno tested the engine at 350AWHP 340AWTQ

-=Suberdave=-
superdave thanks for shearing your injector setup man sounds like your abit of a handy man in the garage to make up your own addaptors to seat the top feed injectors to the plenum..... i think i might just bit the bullet and slap in some upgraded side feed injectors and still use my stock fule rails....good for 22 psi i think ?

if u dont mind me asking what did it take to get 350awhp ? congrats on that power level bro thats going to be a fun street car...do u have early ej20g or ej20k ?
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Old 08-06-2017, 08:18 PM   #7
binny
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Quote:
Originally Posted by suberdave View Post
Here is what I did.

I made a custom adapter to fit in the manifold, then used OutFront fuel rails with modified brackets to hold them to the manifold.

The adapters are simular to these ones:
www.radiumauto.com/

The 26mm units were not on the sight when I made mine. or I would have likely just bought them. I made mine at 1.035" or 26.28mm but they could just be running a little larger O-Ring...

I am running modified OEM injectors flow tested at 980CC.



So far so good...

Just dyno tested the engine at 350AWHP 340AWTQ

-=Suberdave=-
Raidum do the full kit now - easy peasy

http://www.radiumauto.com/Top-Feed-F...1-6-P1177.aspx
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Old 08-07-2017, 01:13 AM   #8
suberdave
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its an EJ257GK+

EJ257 block with JE pistons
EJ20K STI heads w/ shim under bucket
EJ20G Intake Manifold
PE 1820 Turbo at 21LBS
980cc injectors
50/50 Direct-port injected Meth

all in a 2800lbs 1988 GL-10




if you are looking for injectors, i have a set of STI 550cc Yellow injectors, and a set of STI 780cc injectors in rails modified to run -6 AN fittings. (i ran the second set on my engine at 300/335 hp/tq for a few years with no issues)

-=Suberdave=-
www.suberdave.com


Quote:
Originally Posted by whiterabbitrexy View Post
superdave thanks for shearing your injector setup man sounds like your abit of a handy man in the garage to make up your own addaptors to seat the top feed injectors to the plenum..... i think i might just bit the bullet and slap in some upgraded side feed injectors and still use my stock fule rails....good for 22 psi i think ?

if u dont mind me asking what did it take to get 350awhp ? congrats on that power level bro thats going to be a fun street car...do u have early ej20g or ej20k ?
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Old 08-09-2017, 08:26 AM   #9
whiterabbitrexy
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hay superdave thanks for shearing your build and all the help on fuel rail set up .... if i didnt know about the Raidum fuel kit i would have bought your injectors off ya..... since i also found out that i can run a phase 2 block ej207 on phase 1 wrx heads i will be using most of my parts to make it happen and i would love to use my free v7 pink top feed sti injectors its only got 60 thousand km on it...

whats the gk+ stand for when you say ej257gk+?

Hay Binny thanks heaps for telling me aboug that kit....i will be buying it soon .... have u used that kit before ?
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Old 08-09-2017, 11:13 PM   #10
binny
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Quote:
Originally Posted by whiterabbitrexy View Post
Hay Binny thanks heaps for telling me aboug that kit....i will be buying it soon .... have u used that kit before ?
Nah I just made a bracket to suit some top feed rails, but that radium kit would be easier and look better as well
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Old 08-10-2017, 08:16 AM   #11
whiterabbitrexy
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Quote:
Originally Posted by binny View Post
Nah I just made a bracket to suit some top feed rails, but that radium kit would be easier and look better as well
cool wish i was as handy as u and suberdave.... thannks for the tip

hay everyone quick question ..... if i just upgrade my injectors/fuel rails and fuel pump with a stand alone ecu i dont have to get a aftermarket adjustable fpr ? ....is a fpr only needed to fight poor fuel pressure from the stock fuel pump ?
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Old 08-11-2017, 12:00 AM   #12
binny
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You can use the factory FPR but depending on which fuel rails you use you may need an adaptor (which radium and others have)
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Old 08-11-2017, 05:44 AM   #13
whiterabbitrexy
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Quote:
Originally Posted by binny View Post
You can use the factory FPR but depending on which fuel rails you use you may need an adaptor (which radium and others have)
cool thanks Binny yet again lol .... hay Binny why do people get aftermarket fpr ? whats it help with ?
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Old 08-11-2017, 10:59 PM   #14
binny
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They look awesome and you can raise the base pressure to get more from your injectors ~ also if you have a massive fuel pump they can flow more than the factory pump (to give a stable base pressure)
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Old 08-17-2017, 01:23 PM   #15
suberdave
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Quote:
Originally Posted by whiterabbitrexy View Post
whats the gk+ stand for when you say ej257gk+?
My engine is made up of parts from:
EJ257
EJ20G
EJ20K
+ Lots of other stuff.
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Old 08-19-2017, 11:37 AM   #16
whiterabbitrexy
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Quote:
Originally Posted by suberdave View Post
My engine is made up of parts from:
EJ257
EJ20G
EJ20K
+ Lots of other stuff.
wow lol thats soo cool...its beyond a hybrid lol.....its a frankenstein build hehehe...sounds like u know what your doing suberdave .... congrats on your build bro.... thanks for shearing
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