Jump to content
SAU Community

Front facing plenum and fuel rail

ceoont

By ceoont,
in R Series (R30, R31, R32, R33, R34)

 Share

Recommended Posts

ceoont Rookie

ceoont

Posted
Posted

Hi guys hoping someone here can clear this up for me. If this question has been explained before then please let me know with a link if possible to the thread. Have tried looking up an answer myself but it's proving difficult.

 

I'm in the process of upgrading my engine(RB25DET NEO), I had originally decided to upgrade the injectors but keep a low mount turbo, meaning all my intake pipes could be left as is. Now however I'm thinking of going top mount and getting a front facing plenum. My question is, will my injectors fit? Denso 570cc GTR injectors. Will they require a new fuel rail with the plenum or can the standard rail be used? Does it depend on the particular plenum? Any info on this whole topic would be brilliant.

Thanks in advance.

PFA97a35d48307d95a0fcc05986aa9269e8.jpg

Link to comment
https://www.sau.com.au/forums/topic/472593-front-facing-plenum-and-fuel-rail/
Share on other sites
iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

My advice is don't go forward facing plenum. Not really worth the extra hassle.

Will your injectors fit? No way of knowing it depends on what fuel rail and manifold you want to run.

If i was you i would just leave the intake side alone aside from running plazmaman style cooler piping.

r33cruiser Grand Master

r33cruiser

Posted
Posted

IF you are going to replace the plenum man, I'd recommend getting something like a Plazmaman. Don't go the GReddy.

 

I've done both and its so much easier with the Plazzy, you keep the lower runners and a lot of the stock plumbing.

ceoont Rookie

ceoont

Posted
  • Author
Posted

Not after the power mate I have all the supporting mods I need for the power. 570cc injectors, link G4 ECU, splitfire coilpacks, upgraded fuel pump, AFM. I was gona get a rebuilt hybrid low mount turbo but the more I look at top mount the more I want it [emoji23] Seems that FF plenum will require a non standard fuel rail. Can anyone say this for certain or does it depend on the particular plenum used?

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

    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      Welp, good to know. Will have to wait awhile until steady hands with drills and taps are available. In other news, these just arrived! I will weigh them for posterity.
    • Duncan
      Mistakes were made, my R34 Story

      By Duncan · Posted

      100% the factory sender is tapered, that is how it seals (well, that and teflon paste or tape)
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      Thanks folks - I've saved a few links and I'll have to think of potential cable/adapters/buying fittings. First step will be seeing if I can turn the curren abortion of a port into something usable, then get all BSPT'y on it. I did attempt to look at the OEM sender male end to see if it IS tapered because as mentioned you should be able to tell by looking at it... well, I don't know if I can. If I had to guess it looks like *maybe* 0.25 of a mm skinnier at the bottom of the thread compared to where the thread starts. So if it is tapered it's pretty slight - Or all the examples of BSPT vs BSPP are exaggerated for effect in their taper size.
    • Duncan
      Mistakes were made, my R34 Story

      By Duncan · Posted

      Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
×
×
  • Create New...