R33 Rb30 Conversion

[Sydneykid]

Can someone tell me what valve sizes in RB26 and.......sorry SK

No Problems, valve details follow;

RB26 Valve Specs

--------------Head-------Stem------Length------Tip

Intake-----34.65mm----6.00mm----102.40mm----3.5mm

Exhaust----30.15mm----6.91mm----101.55mm----3.5mm

[MonstaS4]

I got my block last week and after removing the head gasket noticed that there was a '2' stamped on each of the pistons and next to each cylinder on the deck.  Is this an indication that the cylinders have been bored?  The hone in the cylinders is pretty good considering the engine has 200,000k on it

These numbers are grades or tolerances. Nissan has 5 grades for the RB30. I guess this is one reason for thier reliability.

[Wes M]

Thnx Monsta,

I've pulled everything down now, so its time to start cleaning and making some measurements

[Duncan]

There's 3 sizes for stock RB26 pistons too, 1, 2, 3 each .01 larger.

[Guilt-Toy]

Dropped the RB30DET in last night.. ohhh it looks sooo damn sexy.. hopefully we can get it running tonight!!!

Im pretty excited shame I have to run it in and cant hammer it straight away

how different will the rb30det sound and how different will it be to drive?

ohhh RB30DET

[Bl4cK32]

sounds very tough. Mine is quiter than Joels rb20det on idle, but my exhaust is still very restrictive...

Driving..well very diferent. Coming from the rb20 backround its a bigger step than going from the rb25 like yourself. More torque on take off.....ie wheelspin off boost

[Guilt-Toy]

Tonight is the night unless something holds us up again *GRRRR*

Should i run it in with no boost ?? (disconnect the wastegate) ???

[Bl4cK32]

i am to be safe. I had my tuner start it, which im glad i did....it was running very rich, so he pulled out fuel from the pfc.

[Guilt-Toy]

OMG. You guys have no idea how awesome a RB30DET is. i can now drive everywhere in 5th gear unless i go under 30ks an hour.. then i gotta go down to 4th.....

I am just stoaked. this thing is unbelievable.

[Bl4cK32]

welcome to the club Im glad to see all went well....

[Guilt-Toy]

hard boost cut (air flow meter cut) with standard computer at 3psi

[GTR-Ben]

3psi damn.

[Guilt-Toy]

what max power can you get outta standard rb25det injectors with a rb30det ?

[Guilt-Toy]

3psi damn.

Not a standard turbo though...

Probly good that it does that so it can get a good running in while i still wait for nengun to send me my pfc

[GTR-Ben]

Waiting on my PowerFc also.

You should have ordered some injectors while you were at it. Got my Apexi 600cc's.

[Cubes]

No problems with idle etc on the stock ecu?

Maybe its just a RB20 ECU thing due to a different head (valve sizes etc).

[Guilt-Toy]

it idles fine.. seems to miss on idle a little but thats probly just the gap sizes ??

anyway I got the PFC just now how much were the apexi 600cc injectors?

[GTR-Ben]

I scored them very cheap.. were used in a car for very few k's.

Got them in the apexi bags with all the covers etc, look brand new just smell a little of fuel

Normally say $1200-$1400 I would say for 6.

[Cubes]

Now imagine how happy us R32 RB20 owners were with the torque of the RB30.

[Sydneykid]

what max power can you get outta standard rb25det injectors with a rb30det ?

Interestingly I have seen more power than when they were in the RB25DET. I believe it is because the rpm to make that power is lower, so the injectors can be open longer. An example, if I made 225 rwkw with the RB25 it would be at say 6,250 rpm. That means there is about 5/1000th's of second for each injector to be open. But if I could make say 270 rwkw with the RB30 at 5,100 rpm, then the injector could be open for 6/1000th's of second. This 1/1000th of a second longer time open means 20% more fuel, so that's why you can get 20% more power.

Obviously engine efficiency makes a difference, but I suspect that probably adds to the advantage because a fresh (run in) RB30 is proably going to be more efficient than an RB25 with the usual K's on it.

I have only one real world experience where we got 475 bhp out of the RB30 on the engine dyno. I have never seen more than the equivalent of 390 bhp out of an RB25 with the same injectors.

That should stir up some comments I am sure.