R33 Rb30 Conversion

[GiJOr33]

Answers after each question....

I have a few questions you guys might be able to answer.

1. when will boost come on when using a Gt3040 (475 hp)  with 9:1 comp, power fc with boost controller.

- Around the 3300rpm mark

2. For the guys with over 300rwkw, did you use the standard rb25 sump?, are these baffled?. -I know they have crank scrapers which need to be removed with the rb30.

- i'll be using the standard RB25 sump, i haven't been told any different or read they can't be used

3. another one for the 300rwkw club.  Are their any problems with the standard manifold?.

Ive heard that air is not distrubuted evenly into all cylinders, people have made some mods to the inside of the manifld to fix this problem.

- the standard inlet manifold is fine. It flows suprisingly well

4. Are aftermarket manifolds worth it?.

- depends what you are trying to achieve, if you want big power (450kw+) then yes they may be a benefit

5.Will the rb26 manifold complete with throttle bodies fit onto the 25 head?.

- not without expensive mods. I think there was someone selling adapter plates or something, can't remember

6. attached is a pic of a modified rb25 manifold.

What do you think of this?.

- I wouldn't do that. The inlet plenum is designed to have the air fed from the stock place. Nissan's engineers are pretty smart! If you want a front facing plenum then get one either off the shelf like a Greddy plenum or one made from someone that has designed it to work correctly like Sub Zero rather than just cut and shut the stock one.

[Bl4cK32]

Im using the rb20 sump. The engine builder just bent the fins back to clear the rb30 sump.

If u want good power over 300rwkw, go for a tubular exhaust manifold, and ext. gate

Intake, if u need it, can be bought from RIPS. Give him a pm, he makes a front facing jobbie in kit form (plenum, accelerator cable, throttle body). They must be good if he's in the 10's with his rb30det's

[riceline]

spec's on mine

blueprinted botom end

bored 10 though - pistons over sized

head rebuilt - mild port and polish

Soon to come - 3.5inch zaust - power fc - plenum - fmic

[Cubes]

So you went new RB30 over sized pistons or a set of oversized forgys?

[riceline]

new RB30 over sized pistons

Could not afford the forgys

[GTR-Ben]

What depth etc do I drill the new tensioner hole to on the block?? A more exact location.

I don't want to hit a water gallery or drill into my bore

Oh and what do you guys do about mounting the powersteering etc, as the RB20 etc brackets wont fit the RB30. Do you use the RB30 mount?..which i don't have. And what about belts?

Thanks Guys,

Ben

[Cubes]

With regards to mounting the powersteering.

I've just had a look at the two blocks.

The RB30 block is obviously taller. Hence the powersteering bracket cannot bolt in to the provision available at the front of the head. However in that same location (just above the waterpump) there is a hole available in the block where the hole normally would be in the head without the extra deck height.

I've posted a couple of pics.

It all looks the same to me from the pics. I hope it is.

[MonstaS4]

To the guys using an R33 head (VCT), what injectors are you using? i've read 13B series 6 (550cc) injectors fit, but not sure if mods are needed. S15 SR20 has 440cc, and being nissan should drop straight in?? 7MGTE, 2JZGTE, 1JZGTE are all 430cc, but again unsure if they will fit.

Anyone had experience with these setups? If possible, i don't want to stuff around making a new top feed rail.

Impedance shouldn't be an issue, as i will being going aftermarket ECU. A resistor block can be made easily anyway if need be.

[meggala]

I woudl go side feed 550's at least save making a fuel rail if they are top feed should support close to 600 hp

meggala

[MonstaS4]

So no mods are needed (apart from plug?) to fit the 13B injectors into the rail?

[Cubes]

R33 fuel rail/inlet manifold are setup to use side feed.

R32 fuel rail/inlet manifold are setup to use top feed.

I was under the impression that the 13B 550cc injectors are top feed as Bl4ck32 has recently got his self a set.

So Unless the 13b injectors are sidefeed you will have to mod the R33's fuel rail.

[Sydneykid]

Series V RX7 Turbo injectors (550 cc's) are top feed, high impedance.

[GTR-Ben]

With regards to mounting the powersteering.

 

I've just had a look at the two blocks.

 

The RB30 block is obviously taller. Hence the powersteering bracket cannot bolt in to the provision available at the front of the head. However in that same location (just above the waterpump) there is a hole available in the block where the hole normally would be in the head without the extra deck height.

 

I've posted a couple of pics.

 

It all looks the same to me from the pics. I hope it is.

Have you actually tried to bolt it on though?

It won't actually bolt on, but with some mods it should. Grind it a little..

[Cubes]

So whats actually fouling? Underneath the mount where the waterpumps water galley runs from the front to the end of the block!?!

[51jay]

I'm still a bit confused about the compression ratios. what do you need to get a c/r of 9:1 for the RB25DET head and the RB20DET head.

[riceline]

I used the rb30 powerstearing pump bracket - bolts straight on and no problems to hook everything up.. Mine cost me $20 from the local commo wreckers.

about the compression ratio.. honestly when you get going I don't think you will eaven notice the difference. Off boost the car is still more than able to pull your house down. I personaly think you are wasting cash that could be spent elsewhere.

Just a question that I have for you all. What Oil should I be running in my motor?

Atm im running Castrol GTX3 (up to done 1200k'z) Is this oil ok for the motor?

I did the first 500km'z on GTX standard.

[MonstaS4]

Series VI 13B primary injectors are side feed 550cc. Bit worried about the spray pattern looking at the tips. I'm guessing they'll also be hard to find.

[Cubes]

The tips look the same as my RB20DET/RB25DE injectors I have sitting here.

Thanx Riceline for the tip on the powersteer bracket.

[GTR-Ben]

Yeah Joel, looks like you will need the RB30 one.. it's the shape of the bracket that stops it from working with the RB20 ones etc.

A lot of people use the RX7 550's. They seem to give pretty good results. I just bought some myself.

Some people told me the spray pattern is no good.. but if they do the job then..

[GTR-Ben]

So many different types..

The low ohm ones and top feed there are light purples ones. 10.5mm fitting.

Low ohm top feed and brownish colour, 11mm fitting.

Not sure on the series etc..