Rb25Det Std Injectors Are 11Mm, Right?

[s213b]

R33 rb25det injectors are 11mm correct?

I'm pretty sure, just about to buy new injectors & want some clarification (have the choice of 11 & 14)

Thanks

[scotty nm35]

Side feed. 14mm injectors will require an aftermarket fuel rail, around $150-$200 extra.

[Kinks]

I'm looking at my options at the moment as well.

RB25DET NEO is top feed. RB25DET (R33 GTS-t series 1 and 2) are side feed.

To change to top feed injectors (which come in 11mm and 14mm) you need more than just a fuel rail. You'll need a new fuel regulator (since the factory one bolts up to the end of the factory side-feed rail, which you are ditching). You'll also need adapter plugs on the injectors as aftermarket injectors come with generic plugs not Nissan ones. And some assorted fittings and fuel hose.

If you are still using the factory intake manifold then you need to be very careful about the length of top feed injectors as you can run into clearance issues trying to get the rail under the intake manifold.

ARTZ has done a brilliant writeup here:

http://www.skylinesaustralia.com/forums/topic/403711-top-feed-rail-in-r33-with-stock-plenumyes-it-can-be-done/

The XSpurts and Injector Dynamics injectors are all based around the Bosch EV14, with a few modifications.

The other option is stick with side-feed injectors. Nismo 740cc are designed for our car by the motherland but they are a bit old now. Probably still do a fine job but not the "latest technology". There's also Power Enterprise and Deatschwerks which are new but I haven't heard as much about them.

[s213b]

Thanks for the replies, I want to keep my std fuel rail & std intake manifold etc at this stage.

Will go ffp / 80mm tb & billet rail further down the track

So the answer is yes, std is 11mm. (s2 r33 rb25)

Thanks

[scotty nm35]

The answer is still no.

Side feed.

[Kinks]

The answer is still no. Side feed.

spot on.

[Simon-S14]

its really so easy to convert to top feed on RB25's.. all you need is a neo or rb26 fuel rail and a few bits and pieces and its a bolt in affair.

huge choice of injectors

[s213b]

The answer is still no.Side feed.

Now I'm just confused, I know my injectors are side feed (this was never the question?) I'm asking because I have the choice between 11mm & 14mm. And aren't 100% sure which ones to get.

Which one suits a STD rail s2 r33?

***EDIT: or are you telling me all side feeds = 11mm?

Edited May 5, 2013 by s213b

[r34unit]

Are r34 neo injectors 11mm 3/4 length and top feed ?

[XR Pilot]

Now I'm just confused, I know my injectors are side feed (this was never the question?) I'm asking because I have the choice between 11mm & 14mm. And aren't 100% sure which ones to get.

Which one suits a STD rail s2 r33?

***EDIT: or are you telling me all side feeds = 11mm?

What everyone is telling you is your injectors are side feed. The 11mm or 14mm your asking about is terminology used to describe a top feed injector. A top feed injector won't fit a standard rail, so no matter if you buy either an 11mm injector or 14mm injector it will be a top feed and won't fit, you need side feed injectors. The picture below shows a top feed injector next to a side feed to better illustrate things. So either change your rail or buy side feeds.

Edited May 5, 2013 by XR Pilot

[scotty nm35]

Are r34 neo injectors 11mm 3/4 length and top feed ?

No, they are 14mm.

[GTSBoy]

This thread keeps on delivering!

[s213b]

What everyone is telling you is your injectors are side feed. The 11mm or 14mm your asking about is terminology used to describe a top feed injector. A top feed injector won't fit a standard rail, so no matter if you buy either an 11mm injector or 14mm injector it will be a top feed and won't fit, you need side feed injectors. The picture below shows a top feed injector next to a side feed to better illustrate things. So either change your rail or buy side feeds.

Thanks

This thread keeps on delivering!

Gotta learn from somewhere mate!

[discopotato03]

In another similar thread someone managed to mod an R34 Neo fuel rail to fit on an R33 RB25 inlet manifold with from 3/4 length Bosch EV14 injectors and adapter collars at the lower end . I've just been on the phone to someone I know who has a bare R33 RB25 inlet manifold and I'm going to use that to mock up a Neo rail if I can find one .

Side feeds are a PITA and not something that Nissan kept for very long , note GTRs never used them .

A .

[Kinks]

In another similar thread someone managed to mod an R34 Neo fuel rail to fit on an R33 RB25 inlet manifold with from 3/4 length Bosch EV14 injectors and adapter collars at the lower end .

don't post a link or anything

[discopotato03]

All I can remember is someone claimed to have done it , don't think there was much detail or any pics .

I did hear its a little squeezy under an R33 RB 25s plenum because unlike the Neo it was designed to fit short squat side feed injectors .

A .