Jump to content
SAU Community

Fitment kit for 550cc/850cc side feed injectors on RB25

RB38DETT
 Share

Recommended Posts

Trust33 Grand Master

Trust33

Posted
Posted

whats the go with the rx injectors.Ive heard that they have a different spray pattern and at xtreeme power levels for them in the rb they can sometimes fail.Sounds like bullshit to me.:cheers:

RB38DETT Contributor

RB38DETT

Posted
  • Author
Posted
whats the go with the rx injectors.Ive heard that they have a different spray pattern and at xtreeme power levels for them in the rb they can sometimes fail.Sounds like bullshit to me.:cheers:

Atomisation is for economy and lower emissions. If fuel is too atomised then it can actually part stall because the volume to surface area ratio is lower. Fuel vapourises upon entry into the combustion chamber under extreme power.

I think you're right about it being BS. That is open to a wide range of interpretation but assuming the engine was not running lean then I still expect that if this ever happened and they were ever able to determine the specific cause then they were probably being run easily past 80% duty. I should also add that the side feed injectors are later model than the top feed.

Simply, Blitz use the exact same 550cc side feed injector that comes in the later RX-7s, only difference is it's brand new. Greddy and others sell brand new the 12aT and S4 injectors brand new. All injectors should be cleaned and flow tested before being used. Flow testing even if they are new, that's exactly what Blitz and Greddy do. The injectors are made by Denso. Mazda buy their injectors from Denso just like Blitz and Greddy. Only difference is Mazda actually charge more for theirs.

Trust33 Grand Master

Trust33

Posted
Posted

Im going to try and source some injectors they definently wont be run past 80% more like 70%. with your fuel rail is it a stright bolt in application for 13b turbo injectors?what will i have to do for me to get a perfect fit?

Trust33 Grand Master

Trust33

Posted
Posted

Im going to try and source some injectors they definently wont be run past 80% more like 70%. with your fuel rail is it a stright bolt in application for 13b turbo injectors?what will i have to do for me to get a perfect fit?can i still retain a sard fuel pressure regulator?

RB38DETT Contributor

RB38DETT

Posted
  • Author
Posted
Im going to try and source some injectors they definently wont be run past 80% more like 70%. with your fuel rail is it a stright bolt in application for 13b turbo injectors?what will i have to do for me to get a perfect fit?can i still retain a sard fuel pressure regulator?

The side feeds can be run higher duty, they are a later design.

Do you have an RB20, RB25 or RB26?

The kit is only necessary on the RB25 as they are the only side feed.

RB20 and RB26 are top feed, I can get direct fit. Only difference is impedance, RB20 is high and RB26 are low. I usually can either low or high but don't have any right now.

Send me a PM with your email. Let me know what you need, I will let you know when I have some.

RB38DETT Contributor

RB38DETT

Posted
  • Author
Posted
rb25det.and i am wondering if the oe fpr will fit this new style rail?

Direct fit, no need to change any rails or anything. You only need to change rails when you use top feed injectors on RB25. The fitment kit is so you can keep your factory RB25 rail and use side feed injectors.

RB38DETT Contributor

RB38DETT

Posted
  • Author
Posted
still having troubles getting some.Ill get back to you when i have an answer so dont go anywhere.:D

I won't :D

Even if you want to come up with some and I will see if I can come up with some, if not all, of the others. Plus we could do part swap for primaries and secondaries too (primaries 550cc, secondaries 850cc). I can also modify them and test them as a set too, basically a hobby at this stage but we'll see if I can turn into something else.

Trust33 Grand Master

Trust33

Posted
Posted

Yeah thats all ok but im not after any secondaries only cause i dont need them the primaries are the ones i want.Ive tried a local place today and they have none so i will try a proper mazda wreckers tomoz day.

How much are they usually for a second hand set of 555cc 13b t jobbies in new zealand?

Trust33 Grand Master

Trust33

Posted
Posted

Yeah thats all ok but im not after any secondaries only cause i dont need them the primaries are the ones i want.Ive tried a local place today and they have none so i will try a proper mazda wreckers tomoz day.

How much are they usually for a second hand set of 550cc 13b t jobbies in new zealand?

Trust33 Grand Master

Trust33

Posted
Posted

hi i got this off meggala @ http://www.meggala.com/injectors.htm

RB25

high impedance side feed.

these are very expensive supplyiers are nismo, apexi,denso,sard, HKS,Trust

sizes avaliable 550,660,740,850 cc

use the cc rating to give you a guide as to how much hp they can handel there is a formula which I will include later .

s/hand after market options.

s15 sr 20 engine is reputed to have 480 cc injectors (hard to find)

20b rotary engines are believed to use 850cc injectors.

people fit a new fuel rail to enable the use of top feed injectors but you would still need high impedance if you are using a modified stock ecu or a resistor pack to change impedance.

RB20

high impedance top feed.

the main choice is from the series 5 rx 7. these are 550cc injectors (they are denso and the part number is 195500-2020).

nismo make 2 as well 550 and 600 cc.

But I believe that you can use low impedacnce injectors with a resistor pack from a gtr this has not been confirmed.

this means that i will need a hose tail feed is this what your kit caters for?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Manur33
      Vag Coil Diy loom wire guage selection

      By Manur33 · Posted

      Hi, i’m making Vag coil loom for rb25det, can anyone confirm the wire guage i’m using for power supply in diagram is enough for supply not too small for loom? For earth do i need to follow the same procedure or i can use only 16awg wire for all coil and their connecting wire following to the plug?
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Did you panel beat the dents or have you tried to repair this only using filler?  Is your sanding block soft/flexible and is following the shape of the panel rather then just knocking down the high points? 
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      I haven't knocked them down yet. I think I made the repair more complex than it should have been. I had rock chips combined with waviness and dents and I tackled it all in one because it was near each other and just end up wasting a bunch of bog lol. I'll knock down those areas and see how I go. And yep what you are saying at the end is correct. I think I might be sanding the top of a steep hill then my sanding block falls into the dent and gets rid of the guidecoat if that makes sense. Though shouldnt unless I'm covering too big of an area with not a long enough block. I'll try something new and provide some updates. Getting there though! Thanks as always.  
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Yeah makes sense, hard to comment on your situation without seeing what your doing. I was talking generally before, I would not be looking to randomly create low spots with a hammer to then have to fill them.  It's hard without seeing what your doing, it sounds like you are using the guide coat to identify low spots, as you're saying the panel is still wavy. I don't see how you're not ending up with patches of guide coat remaining in a wavy panel? Once the high spots are knocked down to the correct level, surely to have a wavy panel you need low spots. And those low spots would have guide coat still in them?
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      So I'll put filler past the repair area a bit to make sure I don't miss anything. Then I'll block it until it's almost level, put the guidecoat, then keep blocking until it's gone. Then it's still wavy.  In regards to hitting the panel, I saw this video might give more context - Skip to 0:47 he knocks it down. But yeah I'm sanding until the guidecoat is gone then checking because otherwise my filler is still well above the bodyline. Unless what you're saying is I should put guidecoat around it early, surrounding the filler then stip once it's gone?
×
×
  • Create New...