R33 Rb30 Conversion

[Adriano]

Geoff, slow down your making the rest of us look bad.

[humz]

urgent help needed pls guys!

my 30 blocks all finished and prepped and i should be recieving a call sometime tomorow when my vvt 33 heads ready to be picked up after welding the vvt feed and slight mod to water gallery to suit the 30block. however while my heads there i thought i may aswell get the head specialist to tap the vvt oil feed in the head.

MY PROBLEM, i dont know excatly where to tell him to do it. can someone PLEASE provide me with some detailed pics both close up and from a distance aswell as some measurments of location so i can get this done. also some info on the sizes adaptor and fitting etc.

ANOTHER issue i have is once oil is supplied to the vvt via the extrenal feed does it need to drain off anywhere?? if so where and how??

ideally i need this info tonight so i can pass the info on tomoro.

i have attached pics of the vvt oil feed i have but cant make it out i need more pics/info.

HELP ME PLS!

[humz]

urgent help needed pls guys!

my 30 blocks all finished and prepped and i should be recieving a call sometime tomorow when my vvt 33 heads ready to be picked up after welding the vvt feed and slight mod to water gallery to suit the 30block. however while my heads there i thought i may aswell get the head specialist to tap the vvt oil feed in the head.

MY PROBLEM, i dont know excatly where to tell him to do it. can someone PLEASE provide me with some detailed pics both close up and from a distance aswell as some measurments of location so i can get this done. also some info on the sizes adaptor and fitting etc.

ANOTHER issue i have is once oil is supplied to the vvt via the extrenal feed does it need to drain off anywhere?? if so where and how??

ideally i need this info tonight so i can pass the info on tomoro.

i have attached pics of the vvt oil feed i have but cant make it out i need more pics/info.

HELP ME PLS!

[Craved]

the rb25 vct head has a drain on the exhaust side that it uses for the extra oil fed in.

use a 1/8th fitting

pic of where it is normally put

remember to setup the additional oil drain ont he exhaust side in the sump for this head return.

all pics were taken from this thread btw

[humz]

thanx for info/pics of feed into vvt, i think ill be able to sort that out now.

however i dont completely understand the vvt oil drain part. can you explain it in rb30det for dummies language/pics.

"remember to setup the additional oil drain ont he exhaust side in the sump for this head return"

so do i tap into the head again for teh drain (where do i do this) ?? and run this into the sump somewhere.

[Craved]

thanx for info/pics of feed into vvt, i think ill be able to sort that out now.

however i dont completely understand the vvt oil drain part. can you explain it in rb30det for dummies language/pics.

"remember to setup the additional oil drain ont he exhaust side in the sump for this head return"

so do i tap into the head again for teh drain (where do i do this) ?? and run this into the sump somewhere.

rb25det head already has an oil drain about 15-20mm forward from the exhaust port for cylinder 1.

you need to run the drain line off that flange down and into the sump, so you need a fitting on the sump to accept this line

as you can see in the picture below, it is the gold line infront (left) of the exhaust shield.

[humz]

GOT HIM!

thanx a lot dude for your help i think youve answered all my questions.

would it be possible to use speedflow fittings and a brainded oil line on the intake side for the vvt feed instead of that one pictured in teh above pics??? what im tryna say is is there a reason for using that piece of tube for teh feed??

[Craved]

nope, can run either the solid tube or braided lines.

use speedflow if you have the cash, if not std gas type fittings that are used in the pics

that isnt my setup above, i think personally from what i have read, that a seperate return that is seperate from the turbo oil drain is a wise idea due to the amount of frothy oil that comes down out of the turbo, but its all up to you

[humz]

hmm thats something to think about.. use same return as turbo or tap a new one into the sump?? has teh pros and cons to both set ups been covered over the thousand pages lol?? if not please inform me briefly.

also HEAD STUDS.

ill be using aftermarket head studs probably arp, however which ones do i buy??? rb30, rb25, ive heard that your meant to use 26 ones.

which stud is the correct one to use??

[Craved]

rb30 and rb25 head studs are the same size - rb26 ones are extremely expensive

[Alf]

rb26 ones are extremely expensive

Only $360 for the ARP ones

30 block needs to be tapped n drilled, 25 head needs drilling to fit the thicker studs.

Not a cheap exercise.

Edited February 27, 2007 by Alf

[humz]

hold on a minute, are you saying the arp head studs are not a direct fit into the rb30det which uses rb25 head??

[AD4M]

no to use rb26 head studs on a 25 head u need to drill the block/head to suit

rb20/25/30 are all the same type 12mm and 26 are 13mm from memory

you just need to source 25 ones

[Craved]

Only $360 for the ARP ones

30 block needs to be tapped n drilled, 25 head needs drilling to fit the thicker studs.

Not a cheap exercise.

http://www.modyourcar.com.au/product_info....roducts_id=3415

$449 bucks for rb26

http://www.tweakit.net/shop/index.php?cPath=57_51_657

$275 for rb25

hold on a minute, are you saying the arp head studs are not a direct fit into the rb30det which uses rb25 head??

no to use rb26 head studs on a 25 head u need to drill the block/head to suit

rb20/25/30 are all the same type 12mm and 26 are 13mm from memory

you just need to source 25 ones

think the rb25 and rb30 are 11mm - rb26 is 12mm and chev rods are 1/2 inch

[GTRgeoff]

Stock RB26 head studs are only $10 ea so $140 a set from Nissan.

Sorry to be going so fast. I NEED to drive this home to Brisbane Saturday, or mostly to get out of Victoria.

All slow now. Fabricating the stuff to make it fit like induction and throttle cable mount and injector loom. Still to mount oil cooler and need more silicone hose and clamps.

RB25 and 26 have the same TPS plug and Bosch injector plugs (RB30) are $7 at Bursons and a straight fit for 26 injectors. Wired 10ohm 15W resistors in line with the injector loom to match the impedance of the RB25 injectors.

[discopotato03]

Yes R33Racer I agree , RB25DET/inlet has limits . I wondered for a while if there's any value in using an R34 25DET head on a decent RB25 or 30DET because it gets you into a mechanical valve train though I'm not sure if RB26 cams (aftermarket) interchange . SK tells me that porting wise the 26 is different and impossible to emulate without fabrication . The big issue is that the marketing geniuses at Nissan made very sure they would piss EVERYONE off by not making the manifold patterns common on all DOHC RB heads . To get a mechanical train its R34 25 or RB26 . To get the gun inlet system its only RB26 and then its aftermarket for a single turbo exhaust manifold . You don't really have any choise , if the hydraulic lifters don't limit you the inlet system will . Its a hateful situation but the answer is to bite the bullet or get painted into a corner . Its not all bad though , someone out there should have a use for your RB25 top end .

Cheers A .

[r33_racer]

yeh id hope so...but we gotta get this new motor making some power first before we even think of doing anything else. Dyno tomorrow arvo for power run to see if we fixed the problem of no power!

But i should start looking around for a busted rb26 or atleast a complete 26 head.

[Spoolup]

Dyno results for today were 480rwhp on 18psi - Im pretty happy with that :-)

Started to lean out a smidge anything over that so looks like Ill need two 044's now.

Full boost with the T04Z is 3600rpm on the dyno.

Its pretty angry now.

[Spoolup]

RB26 cams are a direct fit into the R34 head ( after setting the shims etc ) - I am using HKS 272 / 9.35mm cams in mine.

Performance springs make spring and retainer kits for the NEO now also. Also the intake manifold stud pattern on the R33 and R34 are the same as Im using std R33 runners with the CPC plenum - just thought Id mention that.

Yes R33Racer I agree , RB25DET/inlet has limits . I wondered for a while if there's any value in using an R34 25DET head on a decent RB25 or 30DET because it gets you into a mechanical valve train though I'm not sure if RB26 cams (aftermarket) interchange . SK tells me that porting wise the 26 is different and impossible to emulate without fabrication . The big issue is that the marketing geniuses at Nissan made very sure they would piss EVERYONE off by not making the manifold patterns common on all DOHC RB heads . To get a mechanical train its R34 25 or RB26 . To get the gun inlet system its only RB26 and then its aftermarket for a single turbo exhaust manifold . You don't really have any choise , if the hydraulic lifters don't limit you the inlet system will . Its a hateful situation but the answer is to bite the bullet or get painted into a corner . Its not all bad though , someone out there should have a use for your RB25 top end .

Cheers A .

[r33_racer]

fark yeh...thats great news on only 18psi...room for alot more by the looks of it.

full boost at 3600rpm in 4th gear?