Fuel Rail / Injectors Question

Discuss the RB20, RB25 and RB26 series engines.
Hustle240
Posts: 36
Joined: Wed Feb 07, 2007 3:06 pm
Car: 94 RB25 Vert

Post

Ok, so here is my problem/question. I just ordered the 50lb MSD injectors from Jim Wolf and they are top feed injectors. So in order for these to work in my RB25 I need a top feed fuel rail (11mm?), fuel pressure regulator?, and anything else?

I didn't realize they were top feed when I got them and they failed to mention it. They told me they were made to directly replace the stock injectors.

Well, if all fails (because I'm short on money) and I decide to just sell the injectors and get some of the nismo 550cc side feed injectors. Will my ECU (which is tuned for the 50lb MSD injectors) need to be retuned for the 550cc nismos? I'm kind of confused here. Any help would be appreciated. Thanks.


s14_sport
Posts: 1852
Joined: Mon Nov 14, 2005 2:01 pm

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yup....your ECU would need to get retuned for the different latency times, etc for the new injectors.

Your choices are to either buy a fuel rail and FPR for the 50lb MSD's

-or-

Send the ECU back to jim for a retune of the 550's which takes a few weeks...probably like 2-3 weeks.

also if you are going to use 550's and you don't have an FPR I highly suggest you get one and I hope you have a high output fuel pump too!

Hustle240
Posts: 36
Joined: Wed Feb 07, 2007 3:06 pm
Car: 94 RB25 Vert

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Any idea where i can get a decent fuel rail? The only place i could even find one is on ebay. Any suggestions on which fuel rail and FPR I should use?

I'm using the Walboro fuel pump.. think it will hold up? Or do I need to go bigger?

So there is nothing else required if I stick with the top feed injectors? FPR and the fuel rail? Just making sure.

s14_sport
Posts: 1852
Joined: Mon Nov 14, 2005 2:01 pm

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i personally would use a brand name rail...but, ive actually heard decent things about the eBay fuel rail so im not knocking it.

definately dont skimp on the fpr...get a nismo or aeromotive

Hustle240
Posts: 36
Joined: Wed Feb 07, 2007 3:06 pm
Car: 94 RB25 Vert

Post

s14_sport wrote:i personally would use a brand name rail...but, ive actually heard decent things about the eBay fuel rail so im not knocking it.

definately dont skimp on the fpr...get a nismo or aeromotive
The only fuel rail i've seen on ebay was the Greddy one. Haven't really seen any knock offs on it. Any good online stores you know of for this?

s14_sport
Posts: 1852
Joined: Mon Nov 14, 2005 2:01 pm

Post

Hustle240 wrote:
The only fuel rail i've seen on ebay was the Greddy one. Haven't really seen any knock offs on it. Any good online stores you know of for this?
dont know of any personally because im using the stock rail with my 740 nismos. but, i heard that there should be some on ebay


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