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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

overpowered Enthusiast

overpowered

Posted
Posted (edited)

just got a quick question or 2 :mellow:

will intercooler piping that fits a rb26 engine fit a rb30/26 setup in the same car? or will i have to extend the pipes the 40mm or so?

can i run the rb30 size head bolts with a 26 head? (this is a throw together engine while i build my other engine on the side so i dont care how long it lasts so if i can get away with 30 sized bolts that would be good)

Edited by overpowered
Sydneykid Grand Master

Sydneykid

Posted
Posted
Gary- The design is a fair compromise for room to make fit as i wanted to low mount the GT35. I wasnt too sure how well the wastegate pipes would work (again clearance limited) but it will run as low as 14-15psi boost. Im using a Blitz dual SBC to boost up to 17psi via the bottom port only, when i try and increase the boost more than this via the conrtller i get problems with unstable boost.

Im only running a 11psi spring in the gate, would this be the problem?? I have a 15psi spring to try.

I don't think you would have to change the external dimensions 1 mm. All you need to do is extend the collector away from the flange. All 6 cylinders have to have flowing access to the wastegate pipe.

The LOWER the boost, the BETTER the wastegate has to work. It has to allow MORE exhaust gas to bypass the turbine. Higher boost means less exhaust needs to be bypassed.

So, I don't think that the spring change will help much in controlling boost in this case.

:P cheers :dry:

Sydneykid Grand Master

Sydneykid

Posted
Posted
just got a quick question or 2 :huh:

will intercooler piping that fits a rb26 engine fit a rb30/26 setup in the same car? or will i have to extend the pipes the 40mm or so?

can i run the rb30 size head bolts with a 26 head? (this is a throw together engine while i build my other engine on the side so i dont care how long it lasts so if i can get away with 30 sized bolts that would be good)

There is usually enough flex in the pipwork and length in the silicone joiners to accomodate the extra 38 mm of height.

RB20/25/30 head bolts are 11mm and RB26 are 12mm, despite the presence of locators, I would be reluctant to leave 1/2mm of float around the head bolts.

:P cheers :dry:

fr0st Experienced

fr0st

Posted
Posted

I've decided my RB20 is no longer going to cut it and I'm keen on breaking my engine building cherry :P

The basic plan is a RB25DE head with GTR valve springs and a standard RB30e bottom end. The car (R32 GTS-T) already has a RB25DET box :kiss:

Just so I'm under no disillusions before I start to collect parts -

Can a non rebuilt RB30E bottom end be expected to last at 270-300rwkw?

Is a metal head gasket and o-ringing a requirement for this kind of power with some reliability?

Can I skim the head (RB25DE/DET) a little to raise the compression closer to mid 8's without upsetting the quench zones? Likewise skimming the block to run a zero deck height?

Is it worth replacing the bearings and rings to after market items or will something else break first (rods?) making it a waste of money?

Will I need after market head studs like ARP's or will OEM do for this kind of power?

I think thats about it... :P

I know a lot of the reliability has to do with tuning but stock parts only last so long before they let go at high power levels. I'd honestly be happy with a responsive 250rwkw from a 'on the cheap' RB30 build but 300rwkw is my goal and probably the absolute limit for a R32 GTS-T anyway. I could probably do it from an RB25 but I want the extra torque to make a bit of a motorkharna weapon :)

Thanks in advance for the advice

discopotato03 Grand Master

discopotato03

Posted
Posted

Frost no doubt someone will confirm/deny but I think all RB26 valve train components are unique dimensions . Your call but the head will most probably make/break the final result . R33 and 34 RB25 heads have larger ports than R32 RB25DE and I would think R33 RB25DE heads would not be very expensive anyway . I can't see why it wouldn't be possible to not use VVT with a 33 DE head plus you'll need springs anyway . I dont think the weld mod to the water jacket would be expensive .

Just my 2c , cheers A .

mr_rbman Grand Master

mr_rbman

Posted
Posted
Frost no doubt someone will confirm/deny but I think all RB26 valve train components are unique dimensions . Your call but the head will most probably make/break the final result . R33 and 34 RB25 heads have larger ports than R32 RB25DE and I would think R33 RB25DE heads would not be very expensive anyway . I can't see why it wouldn't be possible to not use VVT with a 33 DE head plus you'll need springs anyway . I dont think the weld mod to the water jacket would be expensive .

Just my 2c , cheers A .

seeing as its going into a 32 your better off sticking with 32 25de head! Makes everything easier.

r33_racer Grand Master

r33_racer

Posted
Posted

ok here are the sheets.

Just got back from first day of the first round of the state championship round at QR. Was good, but I was expecting more cars to be there...seems alot of people pulled out at the last minute....odd.

post-12828-1174724807.jpg

post-12828-1174724781.jpg

We need a good boost controller. And a better setup suspension.

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