Jump to content
SAU Community

R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

 Share

Recommended Posts

  • Replies 7.2k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

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

Cubes Grand Master

Cubes

Posted
Posted
I got a ride in Macgyers(StockyMcStock) car today.....woot for me and him and his twin charged car....it is the shit i tell you. The rain was lame though.

Jealous Cubes??? :(

lol....

What did you think of the diff ratio in the VLT paired up with the 3ltr compared to your 4.11's? :pirate:

Just a tad long or?

Link to comment
Share on other sites
r33_racer Grand Master

r33_racer

Posted
Posted (edited)

yeh it did seem to stretch out abit more then the skyline....but the power delivery is like nothing ive felt before......we were like 3rd gear 1500rpm and he goes like half throttle and then bam its like a jet turned on and were doing 80 from about 30km/h....fricken awesome so much more power down low and only from 9psi. Lots of wheelspin, but it was raining this morning so it was hard to get a real appreciation of the power and acceleration. Will definetely hit him up for a ride one day in the dry hehe :pirate::(;)

Also just a side note the car is the biggest sleeper....looks like your average commo all stockish looking just lowered. The only give away is the fmic and piping. I spose the massive whine from the blower might be a tad suspect...then the screamer well hell once that goes off then you know it aint some stocko commo.

Edited by r33_racer
Link to comment
Share on other sites
SLIMVLT Enthusiast

SLIMVLT

Posted
Posted

your lucky it didnt have nice neat holes oiut the side of the block sorry to here lad.

all the ppl saying check your clearences ect if there not rite from the initial build it wouldnt have lasted this long and would have shat along time ago

the oil presure blead that he spoke of would have taken the top layer of bi-metal off and things can only get werse from there in a high power situation.

the poor litle berings would be geting a fair bit of force put on them each power stroke taking more metal off each time.

look on the brite side (if there is 1) you can fix any of the things u have wanted to change.

Link to comment
Share on other sites
platinum Collaborator

platinum

Posted
Posted

Pretty basic question -

Are the standard issue rb25 spark plugs suited for the rb30det?

Asked about them at repco, and they want $27ea for platinum "oem" sparkplugs, sounds a bit rich to me (used to paying about that for a set of 6 haha). :)

Link to comment
Share on other sites
StockyMcStock Proficient

StockyMcStock

Posted
Posted (edited)

Hey michael, thanks for lettin me have a squiz at the racecar, top piece of work there. MAKE SURE YOU ASK ABOUT THE OPEN-COLLECTOR, SPLIT PULSE HOUSING DILEMMA! i want you to make an informed decision on the thing before putting it on your engine. it's an expensive piece of equipment, that new turbo. see what the experts have to say about it. at the very least, it won't be optimal for gas acceleration and turbulence through the housing. at the worst, it could melt your scroll separator bar and put bits of molten metal through the turbine wheel. just something to think about :)

definately need to take you for a ride in the dry, you can't really appreciate a twincharge otherwise :sick: don't worry it'll be tuned for 300kw soon, that will be more fun i promise. not quite as spastic as your racecar though.....

platinum - standard plugs are fine man. i use and recommend Cheap Shit Plugs®, they are doing fine so far.

edit: because i'm anal, i collected some quotes for ya:

The reason that you don't use a split turbine on an open collector is basic airflow and HP. Because of the design of a manifold, the airflow directed at the plate is never even, even in my manifolds, which are as symetrical as physically possible with the merge collector, with the gas directed at an agle accross the face of the split, the air can't make a decision which side to go up. This is probably a bad example of what I'm trying to at, but basically, the air is turbulent, and in most instances (as in not very well designed manifolding) the air will try and be forced more to one side of the split, effectively halving the cross sectional area the exhaust gas tries to pass through, kinda like putting a tiny rear housing on your turbo.

One of the companies i deal a lot with that has a 8sec turbo hemi, has tested many different turbos and housings over the years, and picked up 72rwhp and 9 MPH just by changing from a 1.32 split rear on his P trim T66 to a .96 single entry on his single entry manifold, as the .96 is smaller in equivelent size, so all of that power was due to better gas flow, it also picked up 900rpm of spool up time. Basically, airflow will never be even in a divided housing, with an open collector.

6BOOST

okay so i can't find any more cause i suck at the internet. just ask around and see what the "experts" say.

Edited by StockyMcStock
Link to comment
Share on other sites
r33_racer Grand Master

r33_racer

Posted
Posted

Well the oil pump was opened up and checked out and its all good and in one piece. So cant blame the N1 pump for this one. Further inspection has revealed the girdle is cracked around no.6 piston.

Well were stripping down another rb30e long block tonight to get it machined asap to put together this new engine. Two weeks to do this. Gonna be hectic :)

Link to comment
Share on other sites
Cubes Grand Master

Cubes

Posted
Posted
was no.6 piston the one that spun the bearing? is there some way u can crack test the girdle, like u do a crank etc?

When I had the bottom end of mine crack tested the engine builder pointed out a few spots on block, rods, crank and girdle where they tend to crack if they do at all.

I think in r33_racer's experience it was just pure bad luck. :)

Link to comment
Share on other sites
r33_racer Grand Master

r33_racer

Posted
Posted

no.6 did and 5 with 6 being worst. But it cracked around 6 because as everyone knows 6 always runs the hottest. But weve put it down to a definete oil surge issue that started all this a few races ago. We thought we had gotten away clean but we didnt :) So dry sump now, so no more oil issues.

Yup bad luck, but thats motor racing for ya :)

Link to comment
Share on other sites
Nate79 Enthusiast

Nate79

Posted
Posted
We can rebuild it. We have the technology. The next rb30 will be better then before. BETTER, STRONGER, FASTER!

Good to hear it wasn't the Oil pump, was a little worried. I can assure you I have everything crossed for my passenger ride at QR :) . Good luck with the rebuild mate. Onward and upwards.

Link to comment
Share on other sites
cordiapower Collaborator

cordiapower

Posted
Posted

Hey everybody,

just got rb25/30 combo dropped in my car, it has been freshly rebuilt with forged WISECO pistons, has heavily ported head and it made 414rwhp at 18psi with ITS 57 turbo which is equivalent to GT30 I think, now it made a lot of power, it uses standard head gasket but did compression test after maybe 1500km and it has compression ratios between 110-115psi, is that too low even for wiseco pistons? I was told it is built for 8:1 compression ratio but this compression results seem low? It has VCT setup as well. Anyone used WISECO pistons on here and what is compression on their engines?

Link to comment
Share on other sites
Cubes Grand Master

Cubes

Posted
Posted

I think you used the wrong wiseco pistons.

Possibly the pistons they list for the RB30DET that yield a comp ratio that is simply way too low. From memory they achieve a comp ratio of around 7:1.

I used the RB25 wiseco 87mm pistons with a 14cc dome and cometic 0.55" head gasket. With that combo I've got just over 160psi in all 6 when the motor is warm. When cold its just under 160psi. And awesomely.... after 45,000km's all cylinders are the same except for cyl 3 thats a whopping 1psi down, the last comp test it was the same but the motor was tested only when cold. :)

I'm stoked with how even the comp test came out.

Link to comment
Share on other sites
crack Mentor

crack

Posted
Posted
I think you used the wrong wiseco pistons.

Possibly the pistons they list for the RB30DET that yield a comp ratio that is simply way too low. From memory they achieve a comp ratio of around 7:1.

I used the RB25 wiseco 87mm pistons with a 14cc dome and cometic 0.55" head gasket. With that combo I've got just over 160psi in all 6 when the motor is warm. When cold its just under 160psi. And awesomely.... after 45,000km's all cylinders are the same except for cyl 3 thats a whopping 1psi down, the last comp test it was the same but the motor was tested only when cold. :whistling:

I'm stoked with how even the comp test came out.

so the one you used cubes was the one 3rd from the bottom

not the bottom one

here

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • TurboTapin
      CD009 RB Conversion

      By TurboTapin · Posted

      That's the most absurd thing I've ever heard. I would go cut bellhousing over that monstrosity of a flywheel all day, every day. It puts a lot more mass further from the last main bearing. I've had nothing but problems with Collins in the past and refuse to ever buy their products again. I would not trust anything they tell you. He's playing his salesman card.  I'm currently at 640whp on a mustang dyno (~770bhp) with the intentions of running E85 and a lot more power this upcoming spring. Cheers, 
    • GTSBoy
      PRP RB26 cast block + head prototype running

      By GTSBoy · Posted

      Nah, it's not the reduced knock margin. It is a direct mechanical effect of having to initiate the combustion earlier, while the piston is still rising, which starts to exert combustion pressure on the rising piston earlier, making the rest of the engine work harder to finish driving the piston up to TDC where the combustion pressure stops being a negative and starts being a positive. Your modern engine that only needs ~10° to make MBT doesn't waste the other 10 or so degrees of crank rotation. That's almost all of it. The difference in knock margin might go either way. Remember that modern engines to which you are currently comparing the long tractor engine (the RB) are now running super high compression, direct injection, tricky cam control and maybe even cylinder pressure sensors. You're not comparing apples with other fruit. It's apples and sea weed, or some other evolutionarily primitive vegetation. And remember, squish only really comes into play at the very end of the stroke. It certainly does good things, but it is not the biggest contributor to what's going on. It is quite possibly much less important in 4 valve head than 2 valvers also, because there is so much less squish available to a 4 valve anyway.
    • Dose Pipe Sutututu
      PRP RB26 cast block + head prototype running

      By Dose Pipe Sutututu · Posted

      Food for thought, a longer stroke motor would need less ignition timing vs. a shorter stroke motor requiring more ignition timing.
    • PranK
      Skid pans in/around Sydney?

      By PranK · Posted

      Thanks Duncan, HART is only 10 mins from me (I did my bike license there), it'd be awesome if it ran these types of things.  Sutton Road does look good and they take fewer cars than SMSP which is good.  Surely you have enough land to lay a few million tonnes of concrete and some sprinklers D? 
    • joshuaho96
      PRP RB26 cast block + head prototype running

      By joshuaho96 · Posted

      I thought an engine that needs more ignition timing to make power is going to result in less power due to reduced knock margin? More time for the combustion to propagate -> more time for it to heat up the rest of the mix to detonation.
×
×
  • Create New...