R33 Rb30 Conversion

[Cubes]

Its been a good conversation.

I've learnt a little.

[Fitzpatrick Speed Works]

I like the extention on the website the ending particularly

/damnissnan hahaha damn them indeed..

[Fitzpatrick Speed Works]

Heres some shots of what I have been doing lately. Just painted some stuff on the weekend to go along with the 100s of other parts I have painted, started making my light weight doors, and also the massive rewire of the car. I am moving all the wiring inside the car and cutting from the loom what i dont need like radio stuff ect, hope I remember where it all goes cause the wire schematic is too big too understand haha.

[StockyMcStock]

another quick question: has anyone had any problems using the R33 n/a plenum instead of the turbo plenum? i have heard that the last two runners are shorter and may cause issues with air flow distribution to 5 and 6. is this rumour or truth?

[Bl4cK32]

The last two runners are slightly offset in the r32's to clear the brake master cylinder i believe. The top of the plenum is different from each model as well (AAC valves are different from r32 rb25de and r32 rb20det) Pretty sure the r33 na would be different also.

Depends on what car you are doin the conversion in....In a r32 use the lower half of the rb25de runners, and rb20det plenum. Not sure on r33 inlet manifold port sizes, but the rb25de has bigger ports than the rb20det hence why u use the rb25de runners. I posted some pics a while ago in here showing the difference in sizing....

[StockyMcStock]

the engine is going into a VL (/me hides from flamethrowers) and as such should have no real clearance issues i believe. the main thing that worries me is the possibility of 5 & 6 running lean from too much air, but just by looking at my plenum's runners they don't appear to be much different from the other four. i might just leave it and see.

[MonstaS4]

FYI - The R33 runners miss the VL brake booster by 10mm - just enough.

I havn't had any issues and don't expect to. I'm sure nissan has spent millions of R & D money designing these things so that it is not possible to run 1 or 2 cylinders so lean that an engine could die, regardless of whether it's a turbo or N/A plenum.

[RB30-POWER]

On a side note.

Does the RB25DE from the R32 models have the shorter runners on 5 & 6?

They would have too, wouldn't they to clear the master like the RB20DET does?

Just want to ask for my own interest sake.

[Cubes]

R32 RB20 and 25 plenum/inlet manifold looks exactly the same.

You can bolt the r32 rb25 on to the rb20's inlet plenum and vice versa.

[RB30-POWER]

The R33 25de/det plenum won't go on RB20 manifold though.

The R33 don't have the shorter runners on 5 & 6.

If your 25de plenum fits onto the 20 runners, i think that confirms that the r32 rb25de does have the shorter runners like the 20det.

The R33 are not shorter on 5 & 6.

[Bl4cK32]

Id say they are not shorter, just offset to clear the brake booster.

It would cause problems with tuning if they were actually shorter than the other runners.....

[RB30-POWER]

I've only ever quick looked at them, but im going to say, they are shorter, they don't make the length up in anyway that i could tell,

i.e by running them out to the side or sticking further down and back up to the head inlet.

Im going to say this is the dodgiest piece of Nissan engineering to date, like they made the motor then realised whoops, dont fit in the car, bah, lets just shortern them....

Who has a plenum to prove either way?

Cubes?

[Bl4cK32]

I have both....posted these a while ago.

They appear to loop down abit, where the others seem to go down, then straight to the head. Id still say they make up the length that way...

[Bl4cK32]

I have both....posted these a while ago.

They appear to loop down abit, where the others seem to go down, then straight to the head. Id still say they make up the length that way...

added pics sorry

[Cubes]

meh.. worrying over nothing.

I have never heard of an Rb20det failure due to the inlet manifold design.

Come to think of it.. RB20DET's hardly ever fail. If they do, generally its a spun bearing.

[RB30-POWER]

Ok, they do appear to loop a little.

Need to pull the sand out i guess and see how much volume is in those runners compared to the others.

It must be close though.

Cheers for the pics, always nice to clear stuff up.

100 pages can't be to far away now

[StockyMcStock]

okay i just checked my R33 non turbo plenum and it does not look anything like that, the top-bottom join on the runners are all on the same level, and they all look pretty damn similar in length.

so i'd say i'm okay with the plenum as it is......

p.s. jesus there's a lot of goddam coolant lines on these buggers!

[masTers]

SO just the clarify, if using the R32 RB25-DE Head, you can use the R32 RB25-DE lower half of the intake manifold with the RB20 Upper half with no worries? Just making sure before i pick up a RB25-DE manifold this weekend.

Steve

[Cubes]

That is exactly what Darren and myself did.

[masTers]

Thought so, just wanted to make sure.

Build up is coming along nicely

I assume standard gaskets are availabe from nissan over the counter?