GReddy Injector Help!

[ChoppedSpots]

Hi all, 

I have a older model of the Greddy Front facing intake on an RB25DET NEO Head. I've bought aeroflows fuel rail and injector kit (1000cc Bosche injectors) and I'm unsure if the fitment is correct. The injector o-rings fit in the intake hole but it's not snug. I can very easily rotate the injectors even when the fuel rail is mounted. The kit also came with multiple adaptors, they dont make it any more snug and using them raises the injectors up and i cant mount the fuel rail. I hope this makes sense I've asses a few photos. 

 

Thanks so much guys. 

Edited November 10, 2024 by ChoppedSpots
Clarification

[TurboTapin]

I have a radium fuel rail on my Greddy manifold and used the supplied radium fuel injector to manifold adapters (The round green things pictured). I did always wonder if you could just go ahead and use the second lower hole like you're doing...

Wouldn't thicker o-rings solve your issue?

 

 

[ChoppedSpots]

Thanks for the reply,

So i've continued playing around, and fitted the injector adaptors onto the injector, the fuel rail is not able to be mounted now as the injectors sit a bit further out. I suppose the point of the adaptors is so that the injector nozzle isn't so deep into the intake? I suppose 1mm extra on the o-ring would do it but still can't mount the rail onto the intake haha.

Waiting on a reply from Aeroflow I'm sure there's something stupid that I'm missing...

[GTSBoy]

Unless there's something particular about the Greddy manifold's injector holes that I'm not aware of, those injetcors look to be totally wrong. They would absolutely want to be spaced up to get those long snouts out of the runner. Which, I think, is not usually the way that that problem is solved. I think the problem is solved by using the correct injectors, which would be much more like what Andrew posted.

[Dose Pipe Sutututu]

You need the bottom spacers, to make it a 3/4 height injector.

https://www.efihardware.com/products/3040/injector-adapter-lower-for-extended-nose-injectors

 

And you'll need to buy the right injector bosses, these "might" fit. You'll need to measure it up.

https://www.nzefi.com/product/raceworks-lower-injector-mounting-boss-kit-for-r33-rb25det-s14-s15-sr20det/

 

[ChoppedSpots]

Thanks for the replies guys, it's really appreciated. 

It seems the kit was supposed to come with those injector bosses but hasn't. Unsure if they'll help as even with the adaptors to make them a 3/4 height injector they still sit too far out so mount the fuel rail?

[Dose Pipe Sutututu]

  On 10/11/2024 at 4:20 AM, ChoppedSpots said:

Thanks for the replies guys, it's really appreciated. 

It seems the kit was supposed to come with those injector bosses but hasn't. Unsure if they'll help as even with the adaptors to make them a 3/4 height injector they still sit too far out so mount the fuel rail?

Expand  

Should be fine, if you have it sitting too far in, you end up just spraying the walls and have shit idle. You "can" run them like that, however I don't think it's a great idea (also depends on your plenum, might be good to just get the injector bosses first, mock it up and see if you need to get the bottom extension)

Ideally your injectors, with the extension should look like this 

(Not my photos, just Google)

[ChoppedSpots]

Yeah with the adaptors they do look like the photo above - just the fitment within the plenum itself and then further with the rail to the intake is questionable - we shall see tomorrow hopefully once I get some replies from Aeroflow, maybe those bosses are the missing piece....

[Duncan]

Ultimately, if the tip is not far into the runner and the o-ring seals, then you are in business. Have you applied pressure to it as is?

It is not really a problem for the injector to twist once it is bolted down, the oring seals it and you don't want it jambed into the oring too hard

The plenum is intended to take multiple size lower injectors with different adapters, but the way you have it is fine if they seal.

[r32-25t]

You need the kit turbo taipan has shown you because that manifold ia designed have side feed injectors 

[Dose Pipe Sutututu]

  On 11/11/2024 at 3:14 AM, r32-25t said:

You need the kit turbo taipan has shown you because that manifold ia designed have side feed injectors 

Expand  

You can just get the injector bosses, which allows top feeds to fit. He can use the same injectors without issue, like these (another option):

https://rocketindustries.com.au/af59-2210-rb25-fuel-injector-inserts

 

 

The Racework ones look a bit better:

https://www.nzefi.com/product/raceworks-lower-injector-mounting-boss-kit-for-r33-rb25det-s14-s15-sr20det/

 

You could also just get a similar kit like the Radium one by Plazmaman:

https://plazmaman.com/product/nissan-rb25det-r33-billet-fuel-rail/?srsltid=AfmBOoogfYq49X0fu2Wdbf8yOf6zt9egyPAif_gn3Qr3G8hzAphhTgOkO70

 

[r32-25t]

Either way he still need those style of spacer to go into the manifold because the photo he currently has is not going to work 

[ChoppedSpots]

Just ordered those bosses, hopefully that does the trick thank you very much everyone for your replies it's really appreciated