R33 Rb30 Conversion

[Adriano]

A 26/30 will be less laggy then any other rb, if you could buy a "new" rb30e and put a "new" rb25 head on it, and make 160-200rwkw, there is no reason it wouldnt last 300,000 if the tune was ok. Once you want big power, it changes, but only if you start stressing things beyond their capabilities, ther are a couple of 300rwkw rb30det's on here that have lasted longer than 60,000 and showing no signs of distress. If you have 400rwkw and thrash it every day, then it will last as long as an rb25 with the same power.

[Al]

Why would you refer to the rb25/30 as a lag monster?

Not sure what you're trying to ask.

[GTRgeoff]

Consider I bought a previously unopened RB30 bottom end. All stock. Then I got a near new RB26 head, still with stickers on the heads lower surface and had been in plastic for a while with almost no carbon in the combustion chamber. Built with H beam rods and 9:1 comp pistons, without receiving the boost it makes on the twins (basically kept atmo for run in) it makes 160rwkw.

What do stock 25's make? Wait till this baby gets 18psi.......

Lag? I don't think so!

As with any question you might ask without giving enough detail. It depends. Put a V8 Mack truck turbo on and yes it will lag, but the right turbos for the application then it will be lethal.

[MBS206]

Has anyone managed to set the VCT up yet on the RB30/25 combo?

[r33_racer]

setup.....as in make it work with the 25 head...alot of people have done that.

[Scooby]

Consider I bought a previously unopened RB30 bottom end. All stock. Then I got a near new RB26 head, still with stickers on the heads lower surface and had been in plastic for a while with almost no carbon in the combustion chamber. Built with H beam rods and 9:1 comp pistons, without receiving the boost it makes on the twins (basically kept atmo for run in) it makes 160rwkw.

Hi Geoff, do you remember what sort of revs yielded the 160 rwkw?

Cheers

[Cubes]

when abouts is the RB30 DOHC guide going to be updated?

What exactly do you feel needs updating?

[MBS206]

So does anyone have a page that i cna look at to see how to setup the VCT properly.

[shanef]

So does anyone have a page that i cna look at to see how to setup the VCT properly.

dont be a slack carnt, read through the thread and guide like every other bastard had to

[MBS206]

I'm not reading 260 pages worth of stuff, when from what I've read so far of it (about 10-15 pages in) is mainly people going "OMG, that's great, I plan to do that too"

It seems more of an RB30 chatter then a technical guide

[Craved]

here some pics of the feed line

[MBS206]

So you just ran an external oil feed upto the VCT then Craved?

Or is that a return?

[fr0st]

That would be the oil feed from the oil pressure sender tapped into the oil passage that would normally feed the VCT. I think...

[r33_racer]

yes you just run an external oil feed to the gallery from your OPS feed. T piece from either the ally heat exchanger or from the bunged hole in the block and run it to a newly tapped hole in the front inlet side of the head where you can see a tube like casting running up the head to the inlet camshaft area. Make the fitting thats in the head feeding the gallery to have about the same size hole as the std feed from the rb25 block which i think is something like 1.6mm....but im probably wrong.

Though this is probably the biggest thread in the tech section, it would definetely have the most tech info available. Sometimes the chatter is techinical

[Craved]

FYI those pics i posted are from this thread some time ago, that isnt my exact setup, but very close

[GTRgeoff]

Hi Geoff, do you remember what sort of revs yielded the 160 rwkw?

Cheers

Mark I don't really remember. I just asked him to tune it to start and run at 60, 80 and 100 so I could run it in.

I'll be getting the bov and boost control sorted so I can have the tune redone soon. Should be interesting. Then it's time to throw it back at the track.

BTW I'm on skype, geoff.williams89 if you feel the need to chat sometime.

[Spoolup]

Hey Geoff

Did you get the cam gears installed ?

I got the 3.5 inch exhaust done last week, just finished installing a new 10mm fuel line, with new outlet on the tank cap today also.

So booking a tune in as soon as Matts available.

Trevor at custom exhaust specialists said I should pick up 20 - 30 rwhp on same boost with the new exhaust as the old 3 inch would have been maxed out. So looking at over 500 rwhp on 18 psi. But I want to tune it until it pings on 100 ron and then back her off a bit.

Will keep you posted.

PS. Hope your gonna blow or turbo the XR8, otherwise you are going to be very disappointed with the NA V8 :-)

[GTRgeoff]

No I've been busy since moving into the new place but maybe later this week.

The Falcon will stay pretty stock. If I want jollies that's what the GTR and racecar are for. Never try to make a silk purse from a sows ear. The ute is for towing a boat and racecar and work.

That thing of yours just keeps getting better mate.

[Spoolup]

Thats right - I forgot about the boat. Now I understand.

No I've been busy since moving into the new place but maybe later this week.

The Falcon will stay pretty stock. If I want jollies that's what the GTR and racecar are for. Never try to make a silk purse from a sows ear. The ute is for towing a boat and racecar and work.

That thing of yours just keeps getting better mate.

[EngoR33-300]

i agree completely sydeykid... dont get a t04.. ive got one on mine and it is a f***ing biatch to get spooling... tooo big for a r33