Hello, first, I'd like to thank everyone for any help I receive.

Ok, I've searched here, and other places, but I am getting mixed messages and ideas.
I would like to know what my options are for fueling a turbo engine with a returnless system (4g94). I'm only looking for 5-7psi.
I have a wideband already installed.

Heard about:
aeromotive (pricey)
RRM (5th injector and ecu, more pricey)
Switching to a return (changing intake manifold, pump, and running lines?, really want to avoid this)
Greddy Emanage
Apexi NEO
Bigger injectors (wrx 440s) (no ecu)

If I go with a greddy or apexi etc., will this make the stock ecu send more fuel to the motor under boost without a rising rate or anything else other than a walbro pump? (fpr, rising rate?) I'm under the impression that if I added larger injectors that I could cut fuel for idle, and add fuel for boost with the greddy or apexi.

I really don't want to swap manifold and fuel rails either.
I just want the most cost effective, safe way to boost 5-7psi on a returnless system.


Thanks for your help.

 

You don't have to do much to make it into a return line. I think you just need the lines and a new pump. maybe a new fuel rail, which you can upgrade it to a big bore one.

 

I've heard this.
I've also heard that I need to get an 02-03 intake manifold and fuel rail.
I would like to avoid this if possible.

Anyone else?

Thanks for the response.

 

I don't understand why a new manifold would be needed. I could compare my 03 and 04 tomorrow and see if there is some big difference between manifolds.

 

Why not just go with a Walbro fuel pump, bigger injectors and a tune?

 

i dont beleive there is an efi system out there that can run with only 5-7psi.do you want to increase 5-7psi over stock? if so an adj.fuel press reg is the obvious choice.ebay for like 50 bucks or aeromotive for 150.maybe i just dont fully understand the question.

 

I want to run 5 to 7 pounds of boost for a custom turbo kit.
I need adequate fuel, but how with a returnless system?

The fuel pressure regulator is in the fuel tank, I can't add an adjustable fuel press reg with this system the way it is (I think). I've read (on here) that some people change to a return system from a returnless system by adding an o2/03 manifold to add the 02/03 fuel rail, run a return line back to the gas tank, etc. (I really don't want to do this unless I have to).

Thanks

 

That sounds fine.
I plan on a walbro fuel pump, but do I need bigger injectors for only 5 - 7 pounds of boost (I've read that I don't, but do I for the returnless system?) There is limited info on what us returnless guys need.

For a tune, I need engine management. What is recomended for a returnless system?

E-manage or apexi alone?
E-manage or apexi with larger injectors and fuel pump?
E-manage or apexi with larger injectors and fuel pump and rising rate regulator?

 

You could theoretically do an ECUflash but of the options I would go with the E-Manage. I would assume you'd just need the piggyback, fuel pump and injectors. The regulator is a cheap way of avoiding the need for a tune but it's not exactly a wise choice.

 

Thanks man. I appreciate the info, but the 'assume' part kind of scares me off from buying what I 'may' need.

I have no problem installing injectors, a walbro, and taking my time or getting help installing the e-manage, but I don't want to get all this in and still not have adequate fueling due to the characteristics of the returnless system.


Any returnless guys have any info?

 

If you buy the right injectors, I don't see what could go wrong. It will all depend on the tune.

 

bump

 

I still need to compare mine. I don't have both cars here in the daylight these days to be able to look at them. I may have them both tomorrow or Monday.

 

I have a turbo '06 lancer running on 14psi returnless. With a Walbro 255LPH, and some 450+cc injectors and something to tune with you will be fine. You can't however use a regulator in-line.... Trust me, doesn't work. Our pressure is 47psi at idle, and just by swapping the pump you will be getting too much fuel on stock injectors, so a piggyback or something to tune with is imperitive. Returnless systems can actually provide more fuel volume than a return type, because of the pressure that is always available to the injectors. With a Walbro I might even be at around 60psi at idle, But I havent checked on a gauge. I'm using a 16G from an evo 8, 460cc injectors from an RX-7, and the split sec piggy to tune.... I have built and tuned the car myself so I do know it will work for you, I have 20,000 miles on 14psi of boost, Ive even had it to 17psi with no fuel issues.... thats right, 17psi on stock internals... though i DO NOT recommend it. HAHA.... Good luck to you mate...

 

the is 1.8L 4g93 manifold
http://images.ibsrv.net/ibsrv/res/sr...e_thumbsup.gif
Apexi NEO
injectors wrx 440cc
I have in my car