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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

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Alf Proficient

Alf

Posted
Posted (edited)

Every head should be CC'd if you dont knows it's history.

I know mine had the face machined prior to me buying it and again was faced after the front water gallery was tigged up.

My R33 RB25DET head's bowls averaged at 58.7 CCs . It's time consuming to get the bowls volume close to each other (0.2CC +/-). :)

no. 6 cyl had the largest bowl volume: 59.8CCs. Had to remove a bit of material to clean up the pitting left from detonation.

PS: I used a burette to measure the bowls.

Edited by Alf
GTRgeoff Grand Master

GTRgeoff

Posted
Posted
Problem solved.

Looks like the cat or middle muffler has collapsed and blocked most of the exhaust.

Got it to 1 bar after I dropped the exhaust at the dump pipe flange and went for a blat up the street.

Whoo hoo, now to just replace the cat or muffler and back to the dyno.

Think Ill have a few beers tonight.

Hope those beers were good.

I should have thought of that. I had a cat collapse once and it was doing similar, but seems fairly uncommon. Well done.

Adriano Grand Master

Adriano

Posted
Posted

the greddy copy manifolds have been discussed in the froced inuction forum, the casting quality seems to be poor, and you can get them off ebay for about $200, noone has got dyno proof yet if they work. I think the siemens injectors are all top feed, so unless you get an r34 fuel rail, which fits the greddy copy manifold, they wont fit. Even with the rail, im not sure if the siemens are the same dimensions as the r34 gtt injectors

Roy Grand Master

Roy

Posted
Posted
Ohhh ok.

I just thought they had smaller housings than a GT35 or are they the same but with smaller wheels?

Do a search for the results of R31Nismoid...its his old turbo that you are talking about.

Also, another quetion... those of you running RB25 heads vs Rb26. IS there a measurable difference between the results are ppl getting with the same turbos...main variable being head and inlet plenum?

Not sure if i should bother with an RB26 head or not

Sydneykid Grand Master

Sydneykid

Posted
Posted
Do a search for the results of R31Nismoid...its his old turbo that you are talking about.

Also, another quetion... those of you running RB25 heads vs Rb26. IS there a measurable difference between the results are ppl getting with the same turbos...main variable being head and inlet plenum?

Not sure if i should bother with an RB26 head or not

Forget about whether or not the RB26 head itself is "better", the fact is it will work out cheaper when you add it all up. Inlet manifold, multiple throttle bodies, plenum, top feed injectors, cams, solid followers, no VVT, adj camshaft pulleys, valves, valves springs etc etc. They are what makes an RB26 head the ONLY way to go.

:P cheers ;)

Spoolup Mentor

Spoolup

Posted
Posted

I cut the cat out of my exhaust today - it is completely screwed and deformed internally. If you hold it up to the light you can not see any daylight.

In the end I couldnt even get the car to idle there was that much back pressure.

It is approx 2500 kms old - I am currently in discussions with regards to a warranty claim so dont want to mention any names as yet. It was not a cheap item though.

Spoolup Mentor

Spoolup

Posted
Posted

yeah - that gets a little expensive when you get defected and they decide to take a closer look - I did consider it though.

Custom Exhaust Specialists in Bris are doing me a 3.5 inch custom cat they have XR6 turbos making 700-750 flywheel horsepower with - its cheaper than the 10k fine :-)

time to put a "hi flow" one in then? :P
Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

i need to scan it this weekend but i ran outta fuel so i need to do more work on the dyno after i change the pump.

How is a good way to get out of the fuel problem? i want to get over 400rwkw if i can with the stock head.

peek power was at around 160ks an hour in 4th gear.. i need to bring it down a bit but wont worry about that untill i get the fuel pump situation fixed up.

Full Boost comes on - 110ks an hour (20psi) in 4th gear all the way up to the end 20psi

It even has 5psi of boost at 92ks an hour in 4th.. comes on early i wreckon

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