discopotato03

Hi Johnny , curious to know if its all up and running with the R33 inlet manifold . I did a lot of searching and reading about injectors that could be suitable for the R34 Neo turbo manifold and there are a few options that aren't based on the short EV14 injectors . Thing is that the original Neo turbo injector looks more like a Bosch styled EV6 and the XR6 Turbo and R35 GTR injectors are similar or same dimensions . Luckily for us the 3/4 length EV14s are also similar dimensions . Overall I think the story is that if you want better top feeds for R33 go the half sized EV14 , or 3/4 length for the R34 Neo turbo inlet manifold . Starting an injector thread to keep this one on topic .

I had time to search a bit further into these twin spray injectors mostly at XR6 Turbo sites . This is basically what the Ford crowd reckon , just remember I'm no XR6T person. They claim the FG F6 has 440cc injectors and they look more like an EV6 than an EV14 style injector . Same length as the 3/4 length EV14 . Owners reckon they are good for around 340 RWKW on Pulp or 290 odd on E85 . There are two 3/4 length Bosch EV14s available that were used in Mustang GT500 quad cam V8s , the 2007-12 ones were apparently 47 lb and the 2013-2014 versions 55 lb flow injectors . The question I have for Skyline tuners is how far past 300 RWKW do you think these 55lb/525s could go on a reasonably well set up RB25 . Thanks in advance , cheers A .

Whats the water outlet tube on the lower manifold like ? Also Ill double check Kudos but I think they sell the RB26 one . A .

What I really need is a Neo manifold that doesn't have a rusted out upper radiator hose outlet . What I also really need is a Neo turbo water fitting that presses into the front of the block below the inlet manifold because the upper curved tube off it is larger than the R33 version . Talk soon cheers A .

I'm interested to hear the real world difference that the two manifolds make . Cheers A .

I'm using ID850s atm so something in the 700-900 range should be good enough for EFlex . Will probably need 3/4 length injectors because I eventually want to run a Neo inlet and there's issues with short injectors in Neo manifolds . A . .

APS Info here . http://www.airpowersystems.com/falcon/injectors.htm

Hi all , of late I've been looking into unmodified split or twin spray EV14 injectors because they are supposed to work better on 4 valve engines . Firstly unmodified . EV14 injectors were the ducks guts when they first turned up and then mobs like Injector Dynamics and others found ways to remove the caps off their tips and increase their flow rates . Thing is the atomisation is probably better with the multi hole cap on and these days you can buy them standard in higher flow rates without the circumcision . I think there is an issue with a single spray injector and 4 valve per cylinder inlet ports , probably not the best idea to be spraying at the port divider when you want the atomised fuel air mix heading towards the inlet valves . I found some info at Air Power Systems and they show pics of Ford XR6T inlet ports and these look like they have twin paths cast into their inlet ports for twin spray injectors . I'd like to hear what people think of the twin spray injector idea . Cheers , A .

All good if you can make it work with some kind of injector adapter . Cheers A .

There may be a slight fix depending on how much material you can mill off the manifold face of the Neo lower section . I had a look at the face and a problem is the lack of material around the front water inlet . This would limit how much you can machine off without enlarging this water passage . If you are prepared to work around this and reset the injector height in the mounting hole it may just be enough to clear everything for your short EV14s . A .

I had a close look at a Neo turbo and R33 lower inlet manifold sections and they are quite different in the injector mount area particularly at the manifold face . The Neo puts the injector tip closer to the head than the R33s and doesn't have the recess around the injector tip area at the top of the manifold ports . Also the ribbed water log is further outwards from the manifold face on the Neo manifold . I'd say this is why the injectors sit deeper into the manifold on the Neo . I think the sad truth is that unless you can fettle enough out of the manifold without finding air or water to get clearance those short EV14 injectors may not be usable . Next question may be will the full length injectors work and are they available in a suitable size unmodified ?

Hi all , I thought this article may interest a few people . A . http://www.motoiq.com/MagazineArticles/ID/4666/Nerd-O-Scope-Honeywell-Garretts-G-Series-Turbochargers.aspx

Just for my 2c . Personally I would never use these GTX compressor wheels without a port shrouded compressor housing , I can't remember too many if any being supplied complete by Garrett without them . RB26 twins don't appear to be an application that can use port shrouded compressor housings because there wouldn't be space for them . I think there are good reasons why Garrett supply RB26 replacement turbos with conventional style compressor wheels , mainly compressor surge . I'm not a GTR person but what I've always read is that GTSS/-9 or 2530s seem to give guaranteed results , for bolt on twin turbos . ATM I think the single twin scroll EFR is probably the better overall package . Playing with experimental turbos is always expensive and the results are often iffy . A .

When I looked into this I found that S14/15 have ratios roughly 3.7 or 3.9 . Also the carrier/crown wheel offset changed between 3.7 and 3.9 , I think the S/R series 4.11 is same as 3.9 . Then the issue is the stub axles because S series is different to R33/34 . You wouldn't want to go backwards by fitting weaker S series joints and axles . There is a myriad of stubs to suit those VLSD centers and lengths differ to suit the carrier offset and inner joint type . If serious the way may be to use a S series 3.9 and fit an aftermarket LSD with stub axles to suit your R34 . Lastly if you use an S series diff as the basis it'll need to be from an ABS car because I think the nose is slightly longer to fit the pinion speed sensor - something to research . A .

Interesting space to watch with this G series . Wheels aside its interesting to note the cast in compressor back plate , and that the overall length is shorter than the current GT25BB based center section . I don't think many would argue that the EFR turbos aren't good things but their overall length is an issue . Also Garrett may have seen the light with stainless steel turbine housings . Fabrication is far easier with stainless nowdays and I believe the Ni Resist turbine housings were always difficult and expensive to produce . If Garrett can come up with single and twin scroll integral gate turbine housings similar to the EFRs BW may have some serious competition . Roll on a slightly larger hot side G30 and G35 series . A .

I think HKS got the first of the Inconel GT turbines in the early 1990s . Think things like GT2530 and GT3037 on early GTRs . I'm a bit surprised that Garrett haven't gone with something along the lines of the 7163s mixed flow turbine . Sort of half way between a (conventional) radial in flow turbine and an axial flow turbine . This can make turbine housing designs specialised and maybe this is too much of a change for Garrett at this stage . They have to think of production economics as well as performance improvements .

I think wait and see what other examples Garrett comes out with . For us same old as when the T3 IW GT3076Rs came out . NEED A T3 mount flange and that integral waste gate to make it a bolt on proposition . Like Mr Lith said need something that's about in between the capacities/capabilities of EFRs 7064 and 7670 . I thought I smelt a rat when the GT3584RS came out because mobs like Garrett have to spend big to develop new turbines so I reckon there's a few more sizes to come . Hopefully soon RIP the old GT28 NS111 GT30 and GT35 turbine families . Gut feeling new designs with less hub mass fewer blades with wide tips and big trims .

Disco in remote location ATM .

Pic of the Neo turbo water fitting . The one on the back of the thermostat bowl . I tried Skyline Spares but they have no Neo Turbo blocks atm .

Hi all , need some info on the RB25DET Neo's front block water fitting . Neo's have a rubber coolant hose that runs from the front air bleeder down to this block water fitting , this hose comes out from underneath the plastic engine cover next to the rubber fuel lines . Thing I need to know is if the barb where the bottom end of this coolant hose connects is 10mm because it is at the top . R33s are 8mm at both ends . The Neo's block water fitting is no longer available new and the part number is different to R33 . Cheers A .

I think an EJ25 is a LONG way from an RB25 and besides having fewer larger pots yep the manifolding is light years apart . I can't speak from experience but I reckon speak to Mr Lith because he's at least had some first hand experience with a single scroll EFR on an RB25 , as in bolted to factory exhaust manifold with a non bastardized integral gate turbine housing . AFAIK EFR don't make a T3 flanged housing for the 7163 so you'd have to modify the T2/25/28 flanged one to suit or use an adapter plate with the T4 flanged one . I've had one tuner say the 7064 can be a little more responsive on engines without brilliant volumetric efficiency , and lets face it the RB25 even in Neo form dates back to 1998 . My opaque crystal ball thinks the toss up for an RB25DET , that can at least bolt to the standard manifold , is probably the 7064 or the 7670 . These are from memory the same frame size and use the same sized housings so outline interchangeable . The thing is that the usual go to turbo for an RB25 used to be an integral waste gate Garrett GT3076R , nowdays if it was known that a 7670 (0.85 T3 integral gate) was same or better response wise than the GT3076R then it'd be a no brainer . Another way to look at it is that if you want up to 300 wasps at the bags 7064 looks pretty good , for up into the mid 300s + then 7670 looks better . A .

Hi all , finally got to measure the difference in bore size between R33 RB25DET and R34 RB25DET inlet manifolds where the plenum bolts to the lower legs . As you'll see its close to 6mm which is considerable . From what I've seen in the past many RB manifolds , except RB26 , seem to be reduced in size or shape in later versions . Nissan obviously thought higher gas speeds and possibly a lesser plenum chamber volume was way to go on the GTt along with head and piston differences . The pic with my grubby finger in it is pointing to the water inlet to the Neo's front bleeder , I'm curious to know if the pipe size and hose is the same size as the hose up from the barbed fitting behind the water pump on R33's . As I've said in the past there's heaps of minor changes all over the Neo 25T and all look to be a step in the right direction . A .

Mr Lith could you pass on the final results of that RB25 you knew of with the EFR 7064 , think it was T3 IWG on the standard exhaust manifold . Sounded like it was really strong for something with number plates , and not exactly lacking round town . I reckon this would be really nice on a street Neo powered Skyline .

Hi Gary , I am interested in an R34 Neo Turbo engine but I am in WA atm and not back in Sydney till the 20 th this month . I will be in contact then , cheers Adrian also over 50 .

I thought it was by now ancient history , the GTRS was a better replacement for the "GT2540R" and ditto the GTSS (-9) for the "GT2510R" . None of these are perfect but the -9 sounds pretty good for the power it was intended for . The inaptly named GT2530R is really what's now known as a GT2860R with a specific 63 trim compressor wheel . GTR twins are a PITA with late GTX compressor wheels because they were designed to work with a port shrouded compressor housing . The Holy Grail is probably a single twin scroll EFR and at a guess the 7670 would please most sane users . Has anyone ever used one on the rare HKS cast low mount 26 manifold ?