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R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

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Skyrine-Dave Mentor

Skyrine-Dave

Posted
Posted

i'd like to use the RB20 plenum too for the "stock" look

along with the RB20 cam valley/ignitor cover

Nissan 2000 24 valve :) :)

can the RB30t water and oil pumps be used? would these be better than the 25t pumps ?

also if i had a bare block RB30 where would i fit idlers and tensioners? what sort of $$$ are they worth ?

*bring back the old thread :) *

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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

Posted Images

DennisRB30 Community Regular

DennisRB30

Posted
Posted

I saw a article in zoom where they had a worked RB26 with cams and huge turbos etc, they then changed over to a RB30 bottom end. Thats all they did, plus a re tune. They left all the other hardware in place. So it is a good scientific example because the only variable that changed was the bottom end.

The engine did not just get some more bottom end grunt. It got more bottom end and shit loads more max power as well, all at the same boost levels.

So engine analyzer programs aside, in real terms the RB30 conversion will shit on the smaller bottom end in power and torque. Sure, it won't rev to 10,000 RPM but it won't need to becuse it will out power the smaller engine at much lower revs.

raist60 Community Regular

raist60

Posted
Posted

Nope, nothing different cept bottom end not even boost.

I dunno on the dyno it had fullboost when being held at 2300rpm

On the road i really couldnt tell you as i wasnt watching judging by torque its pretty much full boost at 3000rpm in ramp mode.

4th gear is roughly 35 rpm to every 1 kph i believe

Cubes Grand Master

Cubes

Posted
Posted

depends on the tyres u are running.. :mad:

I can see how a 4.11 is pretty much required for a RB30.

If 1kph = 35rpm the RB25 made peak power around 6000rpm and the RB30 made peak power around 5200-5300rpm.. That doesn't sound right. Unless the RPM is out 500-600rpm.

Doesn't the RB25 make peak power around 6500rpm?

If that assumption was correct then the RB30 would be making peak power close to 6000rpm which is what i've heard previously.

So what did you have done to the short motor?

Forged pistons etc?

Cubes Grand Master

Cubes

Posted
Posted

JNR24 I think he is talking about the RB20 Turbo oil pump?!?!

If so that will fit and flow enough.

The R33 GTR + oil pump requires an Adaptor.

The R32 GTR pump fits but apparently has problems with some thing cracking.

The cracking maybe due to rev's however so it may not be a problem with the R32 GTR pump on the RB30.

?!?!? Unless I am wrong.

matlowth Proficient

matlowth

Posted
Posted

Joel - when you just increase the capacity of the motor without increasing the volume of air going to it, the point of peak power will move lower... That's why you need a bigger cams, valves, turbo's, etc to make the most of a 3ltr motor.

But for a street/track car - that torque curve and power curve are ideal!

matt

Originally posted by -Joel-

If 1kph = 35rpm the RB25 made peak power around 6000rpm and the RB30 made peak power around 5200-5300rpm.. That doesn't sound right. Unless the RPM is out 500-600rpm.

Doesn't the RB25 make peak power around 6500rpm?

If that assumption was correct then the RB30 would be making peak power close to 6000rpm which is what i've heard previously.

So what did you have done to the short motor?

Forged pistons etc?

Cubes Grand Master

Cubes

Posted
Posted

The NA RB25DE Cams are supposed to be slightly more aggressive compared to the RB25DET cams, not to sure but thats what JMS said?

Sounds good Matt. You can definately see on Raists power curve where the flow restriction begins.

That power dip will be slightly associated with tuning.

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