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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

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https://www.sau.com.au/forums/topic/429221-rb30det-build/
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  • 2 weeks later...

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.

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https://www.sau.com.au/forums/topic/429221-rb30det-build/#findComment-6961931
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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.

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https://www.sau.com.au/forums/topic/429221-rb30det-build/#findComment-6965323
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  • 2 weeks later...

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 :)

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https://www.sau.com.au/forums/topic/429221-rb30det-build/#findComment-6976704
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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

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https://www.sau.com.au/forums/topic/429221-rb30det-build/#findComment-6990751
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