Outer Limits 4x4 Board

anyone swaped there rb30 for an rb25t out off an r33 skyline iam looking at doing this conversion and would like to stick with a patrol rather than a zook. i have a lot of go fast ricer bits laying around so i need to use a turbo motor.
any help appreciated, mik

heres a pointer put the rb25 top end on it and it will fly

adam penfold wrote:heres a pointer put the rb25 top end on it and it will fly

and there only a 2.0l and the rb30 is a 3l

should be a straight conversion my mate went from a rb 30 ( 3.0 litre) to a rb20det (2.0 litre) got sick of that power so put in a rb25det (2.5 litre ) This in a r31 skyline but like he said nissans a very interchangable in al these swaps he never changed his engine mounts

food for thought

best combo is rb26 head n twin turbo or big turbo is almost a bolt on jus need to tap the boss on the timing cover for the tensioner n get the rite lenth belt then enjoy shitting gear boxes, I know a bloke running rb26 in gq thru rb30 gq drive line its real quick till second is spat out the box

Yer mate your options are to install the RB25DET, should bolt in, I know they are dimensionally the same as RB30.

Otherwise put RB25 head on RB30 (better for 4wd, more torque) however its not straight bolt on. There is a lot of info about this on www.calaisturbo.com and other sites regarding the RB30DET.

Just a note on gearboxes. Im not 100% sure on this but compairing the gearbox models i noticed the patrol (im guessin TB42 since people complain about the RB30 boxes) have same box as the RB26DETT and RB25DET engine, reputably one of the strongest factory boxes around.

Get a RB26 bellhousing onto a patrol box (different ratios) = strong RB30 box potentailly.

If i were to guess id say the RB30 patrol has a FS5W71C gearbox however the TB42 has the FS5R30A.

the rb30 patrol boxes have the bellhousings in one pieace so you cant swap them with anything

GRINCH wrote:the rb30 patrol boxes have the bellhousings in one pieace so you cant swap them with anything

He's saying use the TB-D42 gearbox and put the RB30 box in the bin

cheers guys i think ill go the rb25 what year patrols do i need to be looking at buying 1990 ish i asume came with the rb30

I have a rb26 33gtr engine in my patrol with a MASSIVE single turbo it made 505.5hp at the treads and yes gearboxes are a problem, everytime u change into third hard u will smash it, other than that u will have dramas with bearings in the box the horsepower just cains the box and bearings get noisy as.

I am in the proces of build a rb30 26 head with a gt47r should be good for 750wheel hp trying to finish it for 4wd Expo in may,

what are you doing for a gear box to handle that amount of power?

im only chasing 350 hp at the treads. can bellhousing of both boxes be opened up and the rb25 gearset donate the goodstuff so it dont blow up as easy as the rb30 box?
the car will be used for weekend work and the odd comp, maybe even a squirt down the 1/4. would i be better off using an auto and modifying it to handle the power? (id preffer a manual tho)

to start off with i will be using a gq rb30 box i have like 4 spare ones now, the gearset inside a gq rb30 box is of the same quality as a rb25 r33 box if u sit them side by side only difference in the two is the rear shaft length,
i have a rb25 box as i thought they would be different also but no they are they same inside, i have a adaptor plate getting made now to go from rb26/rb30 to tb42 box as they are alot stronger, hopefully they have it finished for me by the time my engine is back but cant see that happening, if you are interested i might be able to get a couple of plates made and sell one to you let me no. i wouldnt go auto as they do drain a fair bit of power and cant really drift it haha

IN THE PROCESS OF DOING THIS CONVERSION INSTALLING THE RB25DET AT THE MOMENT THEN I WILL BUILD RB30 BOTTOM END UP FOR CONVERSION MOST THINGS BOLT UP NOT SURE WHAT TO DO WITH GEARBOX WAS TOLD THEY ARE WEAK AND WILL SPIT 3RD GEAR OUT WILL CHANGE BOX WHEN IT HAPPENS WITH WHAT DONT KNOW?

Here is some food for thought .

The RD2.8t Diesel engine has the same head stud pattern as the RB26 twincam head.

High oil pressure pump
and oil cooler.

Full big end bearing cradle insted of single caps.

It has the water and oil ports with bango fittings to run a Turbo.

The same bottom end as the RB30 so all the go fast bitts fit.

juls wrote:Yer mate your options are to install the RB25DET, should bolt in, I know they are dimensionally the same as RB30.

Otherwise put RB25 head on RB30 (better for 4wd, more torque) however its not straight bolt on. There is a lot of info about this on www.calaisturbo.com and other sites regarding the RB30DET.

Just a note on gearboxes. Im not 100% sure on this but compairing the gearbox models i noticed the patrol (im guessin TB42 since people complain about the RB30 boxes) have same box as the RB26DETT and RB25DET engine, reputably one of the strongest factory boxes around.

Get a RB26 bellhousing onto a patrol box (different ratios) = strong RB30 box potentailly.

the box behind the 3.0 patrol may be good in a VL turbo ( thats what the box is from) but when you put it behind a 3.0 in a 2.5 tonne truck, then it becomes a very shit box.

JEs

choppa1978 wrote:I have a rb26 33gtr engine in my patrol with a MASSIVE single turbo it made 505.5hp at the treads and yes gearboxes are a problem, everytime u change into third hard u will smash it, other than that u will have dramas with bearings in the box the horsepower just cains the box and bearings get noisy as.

I am in the proces of build a rb30 26 head with a gt47r should be good for 750wheel hp trying to finish it for 4wd Expo in may,

hows it going, are we going to see it at expo?

choppa1978 wrote:to start off with i will be using a gq rb30 box i have like 4 spare ones now, the gearset inside a gq rb30 box is of the same quality as a rb25 r33 box if u sit them side by side only difference in the two is the rear shaft length,
i have a rb25 box as i thought they would be different also but no they are they same inside, i have a adaptor plate getting made now to go from rb26/rb30 to tb42 box as they are alot stronger, hopefully they have it finished for me by the time my engine is back but cant see that happening, if you are interested i might be able to get a couple of plates made and sell one to you let me no. i wouldnt go auto as they do drain a fair bit of power and cant really drift it haha

Have you tried an OS giken gear set or one of the many other gear sets for those boxes?

jessie928 wrote:

juls wrote:Yer mate your options are to install the RB25DET, should bolt in, I know they are dimensionally the same as RB30.

Otherwise put RB25 head on RB30 (better for 4wd, more torque) however its not straight bolt on. There is a lot of info about this on www.calaisturbo.com and other sites regarding the RB30DET.

Just a note on gearboxes. Im not 100% sure on this but compairing the gearbox models i noticed the patrol (im guessin TB42 since people complain about the RB30 boxes) have same box as the RB26DETT and RB25DET engine, reputably one of the strongest factory boxes around.

Get a RB26 bellhousing onto a patrol box (different ratios) = strong RB30 box potentailly.

the box behind the 3.0 patrol may be good in a VL turbo ( thats what the box is from) but when you put it behind a 3.0 in a 2.5 tonne truck, then it becomes a very shit box.

JEs

Not quite its a 300zx box.

i wish i was goin to expo i got my new engine in and about to turn key when another workshop called and wants to buy it so now its on the garage floor sold the conversion for $8.000 so i cant complain next time im not tellin noone what im building as i actually want to finish it...

P.S i have 3 spare rb30 boxesa make an offer also rb30 tailshafts and diff flanges to suit if your puttin in a tb/td patrol

NutterGQ wrote:

jessie928 wrote:

juls wrote:Yer mate your options are to install the RB25DET, should bolt in, I know they are dimensionally the same as RB30.

Otherwise put RB25 head on RB30 (better for 4wd, more torque) however its not straight bolt on. There is a lot of info about this on www.calaisturbo.com and other sites regarding the RB30DET.

Just a note on gearboxes. Im not 100% sure on this but compairing the gearbox models i noticed the patrol (im guessin TB42 since people complain about the RB30 boxes) have same box as the RB26DETT and RB25DET engine, reputably one of the strongest factory boxes around.

Get a RB26 bellhousing onto a patrol box (different ratios) = strong RB30 box potentailly.

the box behind the 3.0 patrol may be good in a VL turbo ( thats what the box is from) but when you put it behind a 3.0 in a 2.5 tonne truck, then it becomes a very shit box.

JEs

Not quite its a 300zx box.

same difference, parts interchange.
not teh NA VL box, the VL turbo box.

JEs

juls wrote:If i were to guess id say the RB30 patrol has a FS5W71C gearbox however the TB42 has the FS5R30A.

Nope u got that one slightly wrong

the TB42 has a FS5R50A and the RB30 and RD28T use the FS5R30A Gearbox