I'm want to push at least 9 psi on my stock little internals, so I'm getting the walbro to assist in getting the extra fuel needed. However I was told by some that I didn't need bigger injectors however they can of course come in handy and very good to have but not really needed. All I really need is the Walbro fuel pump and I'll be good to go.
But others are saying that if I get the Walbro fuel pump that I NEED bigger injectors because I'll be forcing extra fuel through the little stick injectors. Which could probably "burn them out" or somthing.
So here's the question...do I really need bigger injectors if I get the Walbro or would I be safe pushing 9 psi without the bigger injectors?

 

if you want to push 9 safely you had better get some type of fuel managment unit and the bigger injectors. if you push 9 with stock injectors you will probably run into problems..

i think 5-7 is the safe range w/o FMU and injectors.. or at least a real good tune..

but in the end it is up to you .. but when you lean out pushing nine.. well you will only do that once

i have vortech FMU
and RC 370 injectors..
i think stock injectors are around 240 cc's

 

I really dont think there is a need to upgrade the fuel pump at all, I you have fuel managment all you need to do is upgrade the injectors, I am running 390cc injectors with emanage and I am confident that I will be able to run 9- 10 psi.

I am told that when tunning , make sure that you retard the timing and run it rich.

In regards to the fuel pump/injectors etc, I feel that it is better to upgrade the obvious and cheaper option first being the injectors. Then If you find that the fuel pump cannot handle it then upgrade it. The standard fuel pump is not a bad one and can handle 390cc injectors easily.

good luck.

 

I dont know what ur talking about but the stock pump is so whimpy!!! Straight up if you run a stock pump on a turbo setup ur asking for problems. Your stock pump can not feed enough fuel. Come on dude!!! Plus the cheapiest way isnt the best!!!!

 

I dont remember saying that the cheapest option is the best! I said it is sometimes the better option rather than spending heaps on somethying that you MAY need.

In MY experience ( not what others have experienced) I have found that MY fuel pump can handle it.

The point of these forums is to share knowledge and experiences along with giving advice, which is what I gave!

If Greates wants to upgrade both fuel pump and injectors that is up to him, and is probably a good idea. but in MY opinion is may not be necessary.

that's all I was trying to say.

 

Hey people,s I think I found out what the prob was. Have you seeeeen the size of the stock fuel rail?? It's totally different than the 02' and 03' OZ Rallys. Mine fuel rail is REEEAAL small and skinny. So I'm going to swap out my fuel rail with a 02' stock fuel rail, since I have a buddy of mine who said that he ran up to 12 psi on that fuel rail. So I'm going to try that before I get the Walbro. I'll keep you guys posted...

 

I dont know do what u want!!! But, it'll save you time, money and effort to just upgrade to the walbro its a whole ($90)! The stock fuel rail should be fine for lower boost like 7psi!! Getting up into the 9 to 12psi range ur pushing it!! Your going to need a really good tune. Which this is going to get expensive. Are you currently running any bosst right now.

*** Aussie***---- A "may" isnt good enough! It can turn around and cost major money for someone! Please dont comment on stuff unless ur 100% sure. U can miss lead alot of ppl. Have you tested ur A/F ratio? How much boost r u running???

 

it's been said that the stock pump can handle up to 210hp at the wheels with larger injectors. getting a new pump will depend on your goals.

what turbo are you going to be using? 9 psi on a t-25 with upgraded injectors could possibly be putting you on the limit of the stock pump. if you're using an fmu instead of injectors, you will definately need a new pump.

 

The pump is just an electric motor so if you can increase the voltage at the pump itself then it will increase the usable output (lph) of the pump. One way to do that is to relocate the battery to the rear and use larger wire to the pump itself. I would also use the larger fuel rail and an adjustable FPR so that you can tune that in. The first thing I would buy when attempting this would be an AF meter so you can tell more about what you have to begin with. You definately do not want to go lean

 

even then, stock injectors will hit their limits early and even a rewired pump wouldn't keep up with the need. even if the rewired pump can handle 90 psi at the rail with the fpr, the stock injectors will only support 210hp at the crank at that pressure. a big T28 will definately go over this at 9psi of boost.

 

^I agree with you larger injectors will definatelybe needed for the 9+psi mark. The OEM fuel pump should do fine tho

 

Well I am running 10psi on standard fuel pump with 390cc injectors and the AF level is stoich, so therefore I am sure that it can be done.

I would not be running that sort of boost on stock internals without having it dyno tunned. Horsepower cost money, and to get horsepower you need to get it safely = dyno tunning.

Go2fast, if anyone takes what people say on these forums as gospel there would be a lot of people in trouble, I personally would not as I am sure you would not either.

I also agree with the the comments regarding fuel rail size, the 02 rail is bigger.

 

i didnt think there was a diff in size of the fuel rail...wow....why not just get an aftermarket or modified rail, they for for about $100

 

I was going to try and run 460 s with my e-manager and walbro255 fuel pump. I was going to do a custom set up but now I'm getting a new car so I wasn't able to try it. I have all my stuff for a custom setup for sale though. Here is the link if your intrested in it https://www.evolutionm.net/forums/sh...d.php?t=171648

 

No one makes fuel rails for Lancer OZ 04+. The fuel rails are totally different. The newer models have like flat kinny fuel rails. The 02' and 03' Lancers have round like fuel rails. I tried to do a fuel rail swap yesterday but didn't work...I'll have pics later on today to show you what I mean. I'm getting the walbro tomorrow, and hopfully that will change for the better. Yes I do have a A/F ratio guage and boost guage, just check out my profile for pics if you want. I have plenty of them...but anyway, As soon as I hit like 4 psi, I lean out and fuel cut. I don't get it!!! I have my FMU hooked up with stock injectors with stock fuel pump and I can't get past 4 psi without fuel cutting. I just TOTALLY lean out! WHAT GIVES!!??? Well I'll get the fuel pump and I'll let you guys know what's up. Thanks for the info and help. I'll be back later on today to post the pics of the fuel rails...