Parts For A 250Kw Neo

[iruvyouskyrine]

Hey all, I am in the process of putting an RB25DET Neo into my R32 gts-t and i just have a few questions about which parts i should be using.

First off this will be my daily (but i will only be driving it 2-3 times a week), but i will be taking it to as many track/drift days as i can, at which i will most probably drive it very hard haha. I am looking for reliability more than a maximum power figure at the moment, but anywhere between 240-270kw i will be happy with as long as it is a very safe tune. In saying that i would like to purchase parts that give me the ability to push 300-330+kw if i change the turbo/manifold set up later on.

I have broswed the forums for ages and have put together a list of what i think should keep me happy, but i would love some feedback/second opinions.

RB25DET NEO

Hypergear Hi-Flow (probably looking at the SS2PU or ATR43G2.5 or G3)

JJR Bellmouth 3" Dump pipe

Full 3" exhaust

Z32 AFM

Splitfire coilpacks

Pod filter

R32 GTR FMIC

Supporting Mods:

NEO NIStune ECU

Greddy Profec B spec 2 EBC

New Nissan thermostat

Full gasket kit (minus headgasket)

Replace under plenum water hoses

My questions are about Injectors and fuel pump.

I am tossing up between Siemens DEKA 630cc, or DeatschWerks 850cc. A few people on the forums use the Siemens, but i was wondering if they would give me enough head room to push 330kw+

Both are direct fit, just after people opinions/reasons why i should choose one over the other. Also would the DeatschWerks be large enough to support E85 if i eventually wet down that path?

Also which fuel pump should i fit. The two that i have chosen are the Walbro GSS-341 (255l/ph) or the newer Walbro 400l/ph E85 compatible pump. After a lot of reading most people seem to agree that neither of these pumps have fuel pickup issues in an R32 gts-t fuel tank.

Also one other question, what engine mounts should i use when putting the NEO in the 32? The normal RB20DET ones or do i use NEO ones?

Thanks!

[scotty nm35]

If you are planning to go e85, just drop some Bosch ev14 1000's in there with the 416lph Walbro e85 pump. The SS2PU should get you there with minimal lag...

[Dose Pipe Sutututu]

have you gotten the FMIC yet? if not just buy a ling long off the shelf kit, custom fitting a GT-R cooler is a waste of money and time

[GTSBoy]

Yup, return flow kit from JJR will do the job. I second the call for Bosch 1000cc injectors (which you can buy in various ways, but the most popular appears to be injectordynamics).

Do not waste your time with a pod filter. Just make sure you have a good cold air feed to the R32 airbox.

Engine mounts......do you mean the steel or the rubber? Rubber, buy standard VL Commodore/R31 from generic parts or the stiffer Nismo ones. The steel bits are best done with the R32 units.

Take the opportunity to pull all the plumbing and other crap from the HICAS system out of the engine bay and from the rear of the car. The Neo PS pump won't run the HICAS system anyway, and you wouldn't want to be retro fitting old crap like the R32 pump onto the Neo.

You will also need to do some adaptation between the R32 and Neo heater hoses. They are different sizes.

Add a timing belt to your list.

cheers

[Dose Pipe Sutututu]

might as well throw in an external gate, weld it to the stock manifold and if you're bored one night use a die grinder to clean it up + open it up a touch.

[iruvyouskyrine]

Are these the ones that you mean? They seem to be the full length ones, I thought NEO's use the 3/4 length injectors?

http://www.t1racedevelopment.com/index.php/en/products/details/1149/153/injector-dynamics/id1000/nissan/injector-dynamics-1000cc-injectors--r32,-r33,-r34-skyline-14mm.html

I was already running an R32 GTR cooler and pod filter so that's sorted. Yeah I'm planning on ripping as much of the Hicas out this weekend as possible, just going to follow one of the tutorials on here.

With the engine mounts I didn't realise they were 2 seperate pieces. So I will buy new VL rubber mounts, and use the 32 steel outer part.

And I'm looking to keep everything as standard as possible, so no external gate haha

[copycutter]

If you're planning on going much over 250kw I'd steer clear of the JJR turnflow, particularly if you're doing SS2 or G3. I have one fitted now and it's a limitation in reaching 300kw, so I'm putting on a non-turnflow Greddy kit now.

Get a larger (min 76mm thick) core and make sure the fron bar air dam is giving most of the core plenty of fresh air (not obscured by most of the stock front bar or number plate).

[jay-rod]

I get 253 Kw with essentially the same mods you have posted up

I have a ATR43G2.5 running at 22 pound

Stock manifold with 600cc injectors.

[lcxu105]

I have 256@wheels with very little done. Head ported stage 1 pomi tom cams 550cc injectors std manifolds neo op6 turbo with hypergear hiflow .63 rear now 3" turbo back 100 cel cat straight through muf and a 600 x 300 x 76 front mount. had chip fitted by EFI at Yatla on Brisbane south side running 12 psi boost and will be going back to get it reset for 16-18psi and hopeing to push up to 280-290kw@ wheels.

Edited March 7, 2013 by lcxu105

[iruvyouskyrine]

Looks like my parts should get me in the ballpark of 260kw then.

Having a read on the forums everyone seems to love the ID1000's, but with the link i posted they don't have the 3/4 length (48mm) option listed? Is there a direct fit ID1000 available for the NEO engine or will i have to use the 60mm ones and modify something else on the fuel rail or connectors? (Sorry, i have never playued around with injecotrs before and there seems to be limited direct fit NEO options)

http://www.t1racedevelopment.com/index.php/en/products/details/1149/153/injector-dynamics/id1000/nissan/injector-dynamics-1000cc-injectors--r32,-r33,-r34-skyline-14mm.html

Thinking a bit more about the build and was just wondering how beneficial cam gears are on the NEO. I know that RB25's have variable cam timing on the inlet cam so would i leave the stock cam gear and just use a variable gear on the exhaust cam?

Thanks.

[JustinP]

Looks like my parts should get me in the ballpark of 260kw then.

Having a read on the forums everyone seems to love the ID1000's, but with the link i posted they don't have the 3/4 length (48mm) option listed? Is there a direct fit ID1000 available for the NEO engine or will i have to use the 60mm ones and modify something else on the fuel rail or connectors? (Sorry, i have never playued around with injecotrs before and there seems to be limited direct fit NEO options)

http://www.t1racedevelopment.com/index.php/en/products/details/1149/153/injector-dynamics/id1000/nissan/injector-dynamics-1000cc-injectors--r32,-r33,-r34-skyline-14mm.html

Thinking a bit more about the build and was just wondering how beneficial cam gears are on the NEO. I know that RB25's have variable cam timing on the inlet cam so would i leave the stock cam gear and just use a variable gear on the exhaust cam?

Thanks.

You want the 1000.48.14 model ID1000's for the Neo. They drop straight in, 48mm long and 14mm on both ends.

[wolverine]

Don't bother with cam gears.

[iruvyouskyrine]

Thanks mate they were on the main page, not in the Nissan section. I want the plugs and clips option yeah?

About the cam gear, if I can pick up an exhaust cam gear for cheap still not worth it? I'd like to have response as close to stock as possible and thought a cam gear may aid this.

[wolverine]

See, "don't bother with cam gears"

There are no results on SAU that I am aware of where cam gears did anything positive on a neo RB25. By the time you install your "cheap" cam gear, try to dial it in on the dyno and end up back at zero you will be wishing you saved your money on the "cheap" cam gear.

[copycutter]

Indeed. I put an OS Giken exhaust cam gear on my rb25 180sx with highmount 3037 and it did sweet FA. I thought I'd have extra midrange this and extra top end that. Nada.

[iruvyouskyrine]

Talking to Matt @ NIStune about my ECU and injectors. He was saying that 1000cc injectors would be overkill and that the engine wouldn't idle and would be very hard to tune. I said that I was planning on using Injector Dynamics 1000's and that lots of people had reported no idle problems with them, and some people (Piggaz etc) said even the 2000's are fine at idle.

Just wanting to see if anybody is running ID1000's on an RB25 with a NIStune before I change my injector choice.

Thanks all.

[GTSBoy]

Just ask Matt if he's working from known lack of goodness with ID1000s and Nistune or just against expectation based on old large injector experience.

[iruvyouskyrine]

He admitted he hadn't worked with any Injector Dynamics injectors before, and he worked with a customers car the other day that was using 1000cc injectors and had massive idle problems.

[JustinP]

He admitted he hadn't worked with any Injector Dynamics injectors before, and he worked with a customers car the other day that was using 1000cc injectors and had massive idle problems.

They will be fine, they have been proven time and time again to idle and tune pretty much better than anything else, smaller injectors included.

To answer your other question further up, yep get the plugs and pins option rather than pigtail connections. That way you can just remove your old plugs and reconnect the USCAR ones to the existing wiring.

[iruvyouskyrine]

Starting to put this thing back together now and i was trying to decide how to best set up the breathers from the cam covers. I have a normal greddy catch can with 2 fittings on it. Is my best bet just going to be to leave the PCV valve in place, and running the exhaust cam cover to one fitting of the catch can, and then the other out of the catch can into the intake before the turbo? Thanks.