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Rb30 Help/ideas Needed

dan@db-power

By dan@db-power,
in RB30 conversions

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dan@db-power Newbie

dan@db-power

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Hi Guys

First off just a hello from merry old England, great site by the way :bunny:

I'm building a RB30 using a RB25 VVT head off a R33 GTS-T and aiming for around the 700bhp mark. The car will be pretty much a full time track car.

I just need a few pointers on what spec accessories to go with the engine.

So far I have forged conrods, forged mahle pistons with a 8.5:1 compression ratio, these will get ceramic coated too. Headgasket will probably be a Cometic 1.2mm or similar.

My main question is about the valve train set-up. I am thinking solid lifters, am I right in thinking that the RB26 has solid lifters as standard and will go into the RB25 head?

Also cams, what spec camshafts would you go for with the aim of 700bhp? There seems to be quite a choice from 256, 260 and 270 degree shafts.

Valves, are the standard valves happy to handle the power, or are they worth replacing too?

Turbo wise I'm either going T04Z or Holset HX40, haven't decided yet. Both will supply me the power I require though :banana:

The last question is what gearboxes do you run when tou reach this level of tune? I have a couple of RB25 boxes here already, and I have heard mixed reviews on how much power they can take :bunny: some peeps kill them at 500bhp and others will cope in excess of 1000bhp :bunny:

Sorry for the long post and all the questions, but it would seem that you guys are the best to answer them :D

Cheers

Dan

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Spoolup Mentor

Spoolup

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1. The RB26 solid lifters dont work on the RB25 VVT head - without major modification. Tomei make solid lifters for the RB25 VVT head.

2. I am making 700 bhp plus with 272 cams with smallish lift of 9.35mm, with std valves

3. The gearboxes are incredible strong and will handle the power you are looking for plus a couple hundred hp more - any box will eventually self destruct if severly abused with with massive rpm launchs etc.

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dan@db-power Newbie

dan@db-power

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1. The RB26 solid lifters dont work on the RB25 VVT head - without major modification. Tomei make solid lifters for the RB25 VVT head.

2. I am making 700 bhp plus with 272 cams with smallish lift of 9.35mm, with std valves

3. The gearboxes are incredible strong and will handle the power you are looking for plus a couple hundred hp more - any box will eventually self destruct if severly abused with with massive rpm launchs etc.

Hi Spoolup

Seeing as you are hitting the bhp area where I want to be, anychance you could post up the spec of your engine? and what turbo your running :D

Cheers

Dan :)

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