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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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Looney_Head Rising Star

Looney_Head

Posted
Posted

would standard pistons and rods be good for 300rwkw?? i am looking to run a rb30 with stardard bottom end

rb25de head gasket

r32 rb25de head with rb26 valve springs, gtr cams and standard manifold.

what sort of turbo would be best for 260-300rwkw, i am thinking a holset hx35 or a garrett 3040.

does that sound like a good idea. i would like any feed back people have

thanks

TTT Grand Master

TTT

Posted
Posted

it's been mentioned in this thread that the GTRvalve springs can't easily be adapted for the rb25de head.

it would be easier to use the 25det valve springs.

it also been said that with GOOD tuning and supporting mods, keeping boost low, with correct sized turbo, 300rwkw can be achieved using stock na pistons and rods and stock gaskets.

but constant high revs will destroy the stock rods.

not sure about GTR cams in teh 25de head either.

standard manifold is ok.

turbo selection..... I don't know.. not up to scratch with my turbo knowledge in terms of what power the turbo's you've said will produce and at what boost levels.

I think you'd need to be a bit more specific with things like exhaust wheel size and so forth.

DORIFUTO_The Future Apprentice

DORIFUTO_The Future

Posted
Posted

Is there a workshop in melbourne that has done the rb31det conversion before that you guys would recommend?

Was going to do most of the work my self but after reading about all the crap people go through with pistons and what not i think i would rather have a warranty.

MarkE Collaborator

MarkE

Posted
Posted

Id asked this question before.

How does the ECU tell what gear the manual gearbox is in?

The Haltech has boost correction dependant on the gear selected, so i plan to use this to soften the power delivery in 1st gear once boost is wound up.

TTT Grand Master

TTT

Posted
Posted

it seems the "search this thread" option is no longer available.

however, SYDNEYKID had stated that GTR valve springs are not a direct replacement for RB25de heads.

it was due to the lifter in 25 heads not being the same setup as the 26 head.

he mentioned that in his first RB30 build when he used the 25de head from an R32, he changed the valve springs and used 25det valve springs.

maybe he'll see this post and confirm or correct me.

MonstaS4 Collaborator

MonstaS4

Posted
Posted
Id asked this question before.

How does the ECU tell what gear the manual gearbox is in?

I have a sensor on 1 front wheel which picks up 5 pulses/revolution. You then calculate how many pulses will occur in 1km and enter this value into the sofware. You work out what each gear ratio equates to in kmh/1000rpm and enter the results plus the required boost correction for each gear and plug this into the software.

The ecu now has a speed reference via the wheel sensor in km, and by using the kmh/1000rpm figures plus the engine rpm it can determine which gear you're in.

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