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R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

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Duncan
Duncan

Just thought I would bump this 20 year old thread because the Skid Factory have just posted up a video summarising a lot of the content, format might be more familiar for newer members

JNR24
JNR24

fyi guys, Well yesturday i picked up a RB30 for my conversion into my R33. I will be using my RB25DET head on the RB30 block. So i started stripping the motor down, pulled the crank, pistons, girdle

Cubes
Cubes

Here is all I have at the moment: http://www.geocities.com/r32_jjc/ Unless you are on broad band make sure you right click then save as. The file is around 120kb. If there is anything I have got w

Posted Images

Dorifta Collaborator

Dorifta

Posted
Posted

VCT question. Does anyone know where the hydraulic valve(ram) is on a R33det that controls the flow of oil to the camshaft phaser.

Need to know where to feed the oil to, as I believe I will be welding the vct oil gallery on the head

thanks

GTRNUR Grand Master

GTRNUR

Posted
Posted
I must be a retard because I cant find what I am looking for even though I am sure its somwhere...

If I am going to put forged RB25 pistons (20 thou oversize) and eagle rods out of the same motor into an RB30 block, will comp ratio still be reasonable (8:1 or 8.5:1)? This combination will be fine I assume as in the .pdf its stated that bore is the same between 25/26/30. The rods are my concern but I am pretty sure they are interchangeable.

Sorry guys >_<

This is the wrong way to build the engine. The RB25 pistons have a lower compression height than the RB30 pistons, so they will be down the block about 0.5mm. The pistons have an 14cc dome on the top of them too. Assuming you deck the block to 0 thou you would have a cr of around 9.8:1, possibly higher if you have the head skimmed to make it dead flat.

Not machining the block to 0 thou deck would give you a little more chamber volume but this would also make the engine more prone to detonation as the sqush pads in the head are way too far away from the squish area on the pistons to make the combustion chamber efficent.

The ideal engine has a 0 deck height and a 0.040" (1mm) head gasket. Then set your desired CR using dished pistons after having your head cc'd. Using RB30 pistons gets you close to 8:1 depending on your head cc.

You should read the PDF file, it covers the options for piston choice.

TiTAN Grand Master

TiTAN

Posted
Posted (edited)

how have people fixed their throttle cable issues. i have a q45 TB on a greddy plenum and using the stock throttle cable bracket i can hook up the cable but there is too much slack in the cable itself.

i heard you can get replacement disks that the throttle cable hooks onto on the throttle body so you can rotate it further to take up the slack. does anyone know where to get these? or am i better off getting the cable modified?

Edited by TiTAN
  • 3 weeks later...
TiTAN Grand Master

TiTAN

Posted
Posted

car is running and has an initial tune on it.

Arias 9.2:1 comp pistons

Stock RB25 cams & springs with slightly cleaned up ports (completely stripped and rebuilt head)

VCT enabled

Greddy intake with Q45 TB

GT3582R 0.82 on an ETM manifold with 4" dump pipe, 50mm external wastegate

The engine is so much nicer off boost than the RB25 ever was and once its on boost the thing flys (making ~5psi by 2300 in 4th)

290kw @ the rear wheels 18 psi and bugger all ignition timing, 11:1 AFR up top and not making use of the WMI as something is leaking into the intake and fouling up the plugs/ deploying a smoke screen (to put it lightly) on the over run (PCV leaking oil, valve guide/s leaking oil, brake master cyl faulty and leaking fluid) any or all of the above. so we cant lean on it till thats fixed, should have an easy extra 70 or so kw left in it.

post-32350-1255439935_thumb.jpg

  • 4 weeks later...
Looney_Head Rising Star

Looney_Head

Posted
Posted

does anyone know the nissan part number for the bolts that hold the crank girdle to the block?

i have asked Nissan but the say they can't find it in thier system.

what bolts do other people use?

thanks

Alf Proficient

Alf

Posted
Posted
how have people fixed their throttle cable issues. i have a q45 TB on a greddy plenum and using the stock throttle cable bracket i can hook up the cable but there is too much slack in the cable itself.

I have the same TB with a CPC plenum where the rb20 and rb25 accel cables wouldnt reach. I found an Aussie R31 Rb30 cable that requires no mods to fit.

gnki'vlct Explorer

gnki'vlct

Posted
Posted
when i bougt mine 2 months ago

ATI917752 $1035 + GST/nil stock. (RB26, direct bolt on,-R32 for cars making 600-1000HP)

ATI917753 $1035 + GST/in stock. (RB26, direct bolt on,-R33-R34 for cars making 600-1000HP

form rocket industry's

Make sure the one your getting has serpentine belt drive unless it's a race car

But u can get them at perfomancewholesale.com.au for around 1000

cheers

can somebody tell me the difference between those 2 items.

just looking on the ATI website now, and they have an "r32 model" and the newer..

shouldnt be the same?

cactus Collaborator

cactus

Posted
Posted

Not sure if this has been mentioned...

I recently got my RB25/30 running (last Tuesday). I did the mod for the VCT, however, all I did was grub screw the hole in the head, with no other modification. My VCT works perfect. No oil control/lack of oil issues or anything (this was mod was done on the advice of my engine builder).

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