R33 Rb30 Conversion

[Alf]

delete plz

Edited February 16, 2007 by Alf

[Alf]

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 February 16, 2007 by Alf

[GTRgeoff]

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.

[snbr2]

has any body heard of the monza (greedy copy intake plenum)

quote from autobarn $440

also siemens injectors 750cc 120 each

just after info if these would be worth a look

[Adriano]

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]

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

[r33_racer]

bother!

[Guilt-Toy]

got 317rwkw on sat outta my 30.. it goes crazy

[Spoolup]

great effort.

What boost, what rpm ?

[r33_racer]

20 psi and im guessing around 3500-3900rpm...is that about right?

[Cubes]

We need a dyno sheet.

Peak power RPM?

[Sydneykid]

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.

cheers

[Spoolup]

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.

[shanef]

time to put a "hi flow" one in then?

[Spoolup]

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?

[Guilt-Toy]

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

[shanef]

y do all the tuners use speed as one of their axis? god it gives me this shits!

[Cubes]

yer same..

Mine always lets me know what rpm is what speed, what rpm/speed it made all its boost and peak power.

[shanef]

yeah, but why dont they just change the bottom axis to rpm? seems farking stupid to me

[paulr33]

rpm = (speed / 28) * 100

this assume standard 4:11 diff ratio