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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

Posted Images

FORZA-MOTORSPORT Proficient

FORZA-MOTORSPORT

Posted
Posted

By the way anyone is SA who wants to come have a look while she is still in the air :P is welcome just drop me a pm, im in my final steps just bolted dump/front pipe with flex in, turbo and adaptor plate is on, just hooking up oil/water lines and putting wastgate on :D

gtst25 Proficient

gtst25

Posted
Posted
VL's have a 3.45 diff (V8's 3.08)

Wheel size doesn't have anything to do with diff ratio does it???

Wheel size directly affects your engine rpm so it has the same affect as changing diff ratios. The larger the wheel diameter the less rpm you will use for the same speed.

VHR32 Community Regular

VHR32

Posted
Posted
Wheel size directly affects your engine rpm so it has the same affect as changing diff ratios. The larger the wheel diameter the less rpm you will use for the same speed.

Yeah know that, I just wasnt sure what Sydneykid mean in his post.

I got a price for RB25DET valve springs from Performance Springs in Qld. $290 set delivered.

mr_rbman Grand Master

mr_rbman

Posted
Posted (edited)
Hey Ash,

If you wish email the larger pics of the dyno sheets so we can read them? :nyaanyaa:

I'm curious how much louder its made the car? So overall... honestly. ;) would you recommend the xr6 turbo on an rb30det?

Now that i've driven the car probably 100kms i have a good feel for it and am very impressed with it, i was expecting lag but with the good compression and torque of this motor u honestly don't feel the lag! The turbo builds boost nicely and doesn't just all of a sudden hit you!

But in answering your question i think the ultimate for this motor would be the .82/.86 or whatever it is like Andrew's (Sky30) but considering i couldn't get that with internal gate this was the best option and i'm more than happy with it!

I'll email you the graphs when i get a chance! (it holds 15psi really nicely with one of them actuators i bought from ATS so i don't even need a boost controller which is a bonus!)

The car is a little louder but sounds awesome, not sure if its due to the fact that i've put a straight through pipe through my cat though!

I think i'm still going to get new diff gears though, i'm 99% certain i'll get 3:9's

Edited by mr_rbman
mr_rbman Grand Master

mr_rbman

Posted
Posted

the pump was second hand! been on the dyno 3 times though with it in and haven't had a problem yet. I'm not too sure why the pump would be holding back the power though? Is it because if it isn't working how it should the injectors need to work harder to make up for it?

I'm not too sure what to upgrade to in terms of the fuel pump? I want something that i can just install as an intank pump (as i use my boot quite a bit so i don't want a surge tank or anything like that) but i've heard too many problems about installing the 044 intank if you let the the tank get below 1/4! But if i was to get the 040 i think that won't be good enough to cope with my power levels????

mr_rbman Grand Master

mr_rbman

Posted
Posted
shaun put an 044 in mine no probs. Ive run it almost dry too without problem.

really? thats good to know, i might go for one of them then cause there good for an easy 300rwkw's

Where did you end up getting your diff gears from?

Did you put your 2-way in yourself? if so was it pretty easy?

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted

yer i bought my diff as a whole pumpkin complete swap over.

Havent got a ratio set yet. People seem to want to sell the diff complete, so may end up going to a local wrecker.

If you are just changing the centres, i think they recommend changing the sideshaft bearings at the same time. If you can, take your diff out, then try a 4wd shop to do the centre swap as they can setup backlash etc...

mr_rbman Grand Master

mr_rbman

Posted
Posted
yer i bought my diff as a whole pumpkin complete swap over.

Havent got a ratio set yet. People seem to want to sell the diff complete, so may end up going to a local wrecker.

If you are just changing the centres, i think they recommend changing the sideshaft bearings at the same time. If you can, take your diff out, then try a 4wd shop to do the centre swap as they can setup backlash etc...

I see, not as straight forward as in and out with a diff oil change then?

Any idea what cars comes with 3:9's? might see if i can get some brand new!

mr_rbman Grand Master

mr_rbman

Posted
Posted
Ash,

Good to see you got your car running, not a bad result for 15psi.

i was pretty happy to start with but as Joel (cubes) has said, my duty cycle is up around the 85% mark which doesn't seem right (should be up around the 250rwkw mark with that duty cycle) so i'm going to do a direct voltage feed to the fuel pump first and the grab myself an 044.

Now hurry up and get yours on the road, hehe! :P

Sydneykid Grand Master

Sydneykid

Posted
Posted (edited)
Yeah know that, I just wasnt sure what Sydneykid mean in his post.

185/60/14 = 905 revolutions per mile

245/45/17 = 808 revolutions per mile

That's an 11% difference, which means a 4.363 diff ratio with 245/45/17's is the same as a 3.9 diff ratio with 185/60/14's.

At 7,500 rpm with a 3.9 diff and 245/45/17's it's gunna do 305 kph. Do you really need that sort of top speed. If you don't, then all that effort/cost making the diff ratio taller will simply result in slower acceleration.

:) cheers :rofl:

Edited by Sydneykid

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