Hi im wanting some help choosing a secondary rail and injectors. I have bnr sage 3s all the bolt ons, wanting to run 14 to 15 psi boost. I want to keep my primary rail and just change out the secondary injectors for more fuel.
Im really wanting to keep everything simple and if possible would keep all the secondary rail stock and install just snew secondary injectors, but i beleive this is not possible as no one makes bigger side feeds.
Ok so which secondary rail do i buy that can keep the standard fuel sensor and standard regulator.

 

FFE has a fuel step up kit.

 

You're probably better off replacing both rails and primary/secondary injectors. The advances in injector performance alone make it worthwhile. Plus, with newer rails you'll be able to uprate much more easily later on.

I actually have a set of very good condition FFE primary/secondary rails and an aeromotive FPR (w/gauge) I could sell you if you want. It all worked flawlessly when removed, I just wanted to add a FPD so bought the fancy CJ Motorsports rails and got a TurboSmart FPR because my shop has a hard on for TS 🤣

 

Rotary Performance also makes just a drop in secondary kit, the injectors are bigger than the stock fuel supply could ever keep up with if you needed them at a higher duty cycle, but it does bolt up and work.
https://rotaryperformance.com/collec...00cc-injectors

I personally run all Radium fuel rail/fuel system parts, since they make a compatible FPD, and their stuff is just art work. It does require running both primary and secondary aftermarket rails.

 

You haven't mentioned if you still have the stock air pump and ACV installed, some aftermarket fuel rails don't fit around it. I have an Xcessive Manufacturing secondary fuel rail, it's OK but I don't think it would fit with the stock ACV. I also have a Full Function Engineering primary rail, it's quite nice. I like the idea of that Rotary Performance fuel rail, but I would contact them and check to see if it can fit aftermarket pressure regulators. There are some aftermarket regulators with a flange-style mounting design, I modified my secondary rail to fit the regulator from a Honda because I didn't want to deal with another fuel line and fitting.


Xcessive Manifold and modified fuel rail, added flange for aftermarket Honda fuel rail

RX7 owners have a lot more good fuel rails to choose from than we had 10 years ago, that's for sure.

 

Thanks f1bluerx7 thats exaclty what ive been looking for,, buy that rail and some injectors and everything i have under the bonnet just plugs straight in (to answer yes all the acv is removed). I have all bolt on mods and brand new bnr stage 3s,, im not going crazy just enough fuel for 14 to 16 psi,, would rather leave the stock injectors alone.

Can someone answer me,, what would be the benefit of changing the stock primarys, i know you say fuel injectors have come along way,,, will the car run smoother better mpg,,, i dunno?

 

Newer non-OEM injectors can give better control and smoother idle. But for your purpose I don't think the amount of money and engineering would be worth it.

The RP rail is a good way to go on cars that just need some more injector headroom - I like that it uses the stock FPR and stock lines, just bolt it in. Many aftermarket setups need new lines, FPR, etc. and are a lot more work. It's fine if you need that for a large single or something but for stock twins or BNR's you don't have to go that far off the deep end.

Dale

 

I was just having this exact discussion on the PFC group. If I were keeping the stock twins or going 99spec / BNR, I wanted a fuel rail setup that is going to work without a headache and fit with the rats nest. My car is JDM so I have a lot less emissions equipment anyways. Do those 2200cc injectors plug right up to the factory harness too?

 

In my experience the Full Function Engineering step up kit with your choice of secondary injectors is your best option. Upgrading both rails is difficult to do with the sequential setup and basically impossible with all the stock hardware intact under the uim due to clearance issues, though I have done it on simplified setups. Keeping the stock primaries and rail with the air bleed hooked up will provide the best idle as well. We stock the stepup kits if you need one. You want to go with the shortie rail and 34mm height injectors.

 

ID, FIC, and a few others make 2000cc injectors that will work with the stock denso style connectors.

 

I have and really like the CJM rails which are so easy to install. The RP secondary rails is so out dated as I originally had one and it was harder to install do to its brackets.

https://cj-motorsports.com/t/rx-7

 

I would agree with everything F1 said. I like my RP rail for me it was easy to install. Everything else stays OEM, but I would not run the 2200s though. I would look into a smaller inj.
The radium is awesome from everything I see. If I was to swap I would go that route. Beautiful and functional. FPD and input for temp and a fuel pressure sender.... please correct me if I am wrong.
Now with with I need to figure out how to splice into the lines for my fuel pressure gauge.

 

does it work with the stock twins and everything except the ACV?

 

Any rail would work with stock twins. But the RP rail is an easy install, lets you keep the factory FPR and factory lines for an easy install without having to re-plumb the whole setup.

Dale

 

The only issue with the RP setup is the injectors are not ID gasoline injectors. At least the guys over at RACEONLY seem to suggest that they are made for different fueling and can cause issues. They suggested that if going with the RP rail to use ID1300x injectors instead based on stock twin or 99spec fueling needs.

 

I think you can get just the rail from RP and then get the ID injectors.

Dale

 

I'm toying with the idea of an aftermarket rail for a car will full emission gear so might look into that RP rail and some ID injectors. Looks like the ACV will fit ok if you swap the lower stud out for an allen bolt from the pics.

 

Might as well change both and go with the radium primary and secondary rails.

 

They will with full emissions gear intact?

 

There should be some pics of the installation in my build thread.
I can let you know how the 1300x work out in them soon. I can't recall if RP used a different o-rings on the injectors themselves or not. I needed slight mods to make it fit with no emissions. I believe I was one of the 1st to receive the "new model ".

 

I went with the Radium rails, simply because they make a full fuel system for the car. Fuel hanger with multi-pump setup and integrated surge tank, fuel filter with FD specific mounts and lines, and rails with every attachment I might want. Super nice to be able to call a single company to get replacement parts or answer questions. Definitely paying a premium for the fuel hanger, but I've burnt out 2 stock hanger plugs in the last month and I'm not willing to compromise drivability any longer. Looks like they are releasing a brushless 1100lph pump soon, should be enough to hit any future goal I might have

 

Looks like the FFE light rails fit with the ACV. I'll likely go that route as the UK have introduced 10% ethanol fuel here which doesn't yet apply to premium fuels but likely will pretty soon so the oem injectors and lines will need to go!

 

Maybe go with some old school 1300cc RC Engineering injectors? AKA .. bored out 850cc injectors for the simplest solution?

 

^That's what I've been running for ages. But, supposedly, newer ones have had problems, I don't know if their process changed or if it's just from trying to modify an ancient injector (ie a 30 year old car part).

I really wish that was still a solid option, that's all the fuel you need for the twins. My setup drives smoothly and I've never had any weirdness.

Dale

 

All you need for the twins at 14-16psi are really just stock injectors, Pettit ECU and a Walbro 255LHP pump for the simplest and most reliable setup.