Rb30Det Build

[corey.hunter]

Hi there,

as my r34 25det neo spun a bearing last week, I am going to be building a 25/30.

I will be using the following parts in my build,

JE pistons 86.5mm

Spool RB30det rods

ACL race series bearings

Crank collar for oil pump drive

Nitto Headgasket

Supertech valves, guides, retainers, springs

Camtech 272' cams

Bosch 1000cc injectors

Garrett GT35r .82 rear

6Boost exhaust manifold

Slide Industries Intake plenum

I'm hoping for a reliable power output of around 500-550rwhp.

I am still searching for information on how people have disabled VCT, is it as simple as welding up the hole?

so if anyone has any information please share

Thanks

Corey

[luke gtr]

looks like a good list to achieve what you want.

not sure on the VCT.

alot of people like it.

if you can get it to work, would be better for daily duties.

[Mick_o]

Dont forget a good oil pump to ya parts list mate and keep VCT it's your friend! GTR boys spend thousands of dollars for VCT! Good luck with the build

[corey.hunter]

With the cams I'll be running I wont be able to run VCT anyway, as for the oil pump ill probably end up with a new standard rb25 pump with a billet gearset

thanks guys

[corey.hunter]

Also does anyone know as it will be going into a r34 which is originally a rb25det neo motor and I am using a r33 rb25 head is there a difference with the wiring?

[Ben C34]

Yes there is a difference. cas. vct solenoid. off the top of my head.

[Ben C34]

Look at thread "neo head or not"

[vkadam]

With the cams I'll be running I wont be able to run VCT anyway, as for the oil pump ill probably end up with a new standard rb25 pump with a billet gearset

thanks guys

Why not change the cams then, if you are only running a GT35R surely tomei type b 260s would be a good match and you can keep the VCT. I am looking into doing something similar. A few people on here seem to be getting great results from the HTA range of turbos in terms of better response and top end power compared to the standard garretts.

My RB25 Neo is running fine at the moment and I am looking at getting one of the HTA GT35Rs and putting that on and then later down the track building up an RB30 bottom end as the 35R might be a bit laggy on the standard 2.5, even being the HTA version. But from what I read the VCT is a good thing so just something to keep in mind, a lot of the guys in the RB30 conversion thread try to keep the VCT.

[Mick_o]

Agreed with the above go smaller cams and keep vct its gunna go much better off boost and bring boost on better

[rb30det_]

That's exactly the same spec's as my motor

Accept mine has a standard bottom end & made 380kw at 17psi on 98octane.

keep in mind i had 3 broken ring lands at the time so loosing compression in those cylinders.

you should be able to crack way over 400kw easily.

[corey.hunter]

okay guys, well I have received my block and head back from the machinist, I have restricted both oil feeds in the block to 1.5mm feeds, the head has been ported and had a service with the new valves, springs, retainers, and cams. the block was bored to 86.5mm and drilled and tapped for the extra tensioner as well as a crank collar fitted.

I'll add some pics in the next few days

[fusion07]

Good luck with build mate, may I ask what power you were previously running on the RB25?

[corey.hunter]

previously was running about 310hp, through the neo on 17psi with a gt2871 on a HKS cast low mount mani with external gate, a power fc, 3inch exhaust and a fmic

[Fantm 34]

Hey I'm looking at doing the same. Are you just using ur car as a daily or some track use? Sorry if I'm on the wrong track, but do u no many good engine builders?

[corey.hunter]

Hi there, it will be used as my daily with the occasional track events, as for engine builders I'm not exactly sure where your from, RIPS always seem to build some porn looking motors but I've gone with a local engine builder so I'm not really familiar with who else is out there, usually a machinist shop is a good place to ask or your local import specialist will have a good idea

[Fantm 34]

No worries mate. Good luck with the build, sounding promising! Will be good to see the results

[corey.hunter]

Engine is together now just waiting on the intake manifold to arrive, I am struggling with uploading pictures apparently the files are too big

[KiwiRS4T]

Engine is together now just waiting on the intake manifold to arrive, I am struggling with uploading pictures apparently the files are too big

Use photobucket or similar

[DR3AMN]

Keen to see some pics.

[corey.hunter]

As it started out as a dirty old 30

http://s960.photobucket.com/user/coreyhunter1/media/image_zpsc14e8fd5.jpg.html?sort=3&o=5

Bottom end together

http://s960.photobucket.com/user/coreyhunter1/media/image_zps4c6c30ad.jpg.html?sort=3&o=3

Turbo, Manifold, Gate

http://s960.photobucket.com/user/coreyhunter1/media/image_zpsdc73a879.jpg.html?sort=3&o=4