Possible swap on R34 RB20DE NEO?

[Kapr]

I meant to stay at factory settings  Any plus power from my engine would be huge. 

BUT it is not happening cuz i talk to the guy and the shipping alone would be around 3500-4500 USD ...which is sadly a no no...

But at least i asked. So thank you for all the info.

Another thing i looked into is/was +T to the that engine but IMO it is harder to get right i would be scared to blow up the engine. 

[Kapr]

Hi.
A little bit of an update.
It maybe(hope not) looks like i would need a new tranny(it would be "maybe" a cheaper or better option anyway)
So i need some info.

I know i need a different propshaft(i can make custom one)
LSD is not a problem cuz the engine will be still(for now) N/A RB20.

So if i buy RB25DET NEO tranny...is there something else i need?
I read something about push/pull type but i do not know if i need to "change" something or i can just plug n play onto my engine a go?

Thanks for the advice  

[GTSBoy]

If the RB20 box in the car is a push clutch, then yes, you will need to deal with the pull clutch on the turbo box. You either buy a pull clutch and don't use the old one, or you do the things needed to convert the turbo box's clutch arrangement over to push. Which is a bit of a f**karound.

"Making" a custom tailshaft is the easy part. But you will need to source the front clip yoke - the bit that goes into the output of the gearbox. These are not as easy to find. They are out there, but they don't grow on trees the way that they used to.

[Kapr]

Yeah thanks...i thought it would be alot more i dont know 😄
I saw some videos on converting push/pull and it seems you need to "drill" the hole for slave(master) cylinder and buy some converter kit.

On that front yoke clip i did not even know that is a thing and i need to source that(custom shops do not do that?)

But anyway thank you for the info

[GTSBoy]

1 hour ago, Kapr said:

Yeah thanks...i thought it would be alot more i dont know 😄

Oh, there's also the gearbox crossmember which will probably be different between the small box and the big box, and the wiring loom will probably need to be modified, because the plugs for the switches etc, will probably be different. And I think the speedo on the small box R34s is from somwhere stupid, like the diff, possibly, so you'd need to work out what needs to be done about that (assuming it is different).

1 hour ago, Kapr said:

On that front yoke clip i did not even know that is a thing and i need to source that(custom shops do not do that?)

I think the thing you need to realise is that the front end of that yoke is a large hollow tube with splines on the inside that mates with the splines on the box's output shaft. It is a dedicated thing - not available "aftermarket". They were made to suit that box, by the car's OEM.

[Kapr]

Maaaan so many "little" things  i rly hope my old RB20 would be "ok" and not too bad.

I try to learn what and what not do i need.
I look at crossmember at it looks different...even parts numbers are different.
Wiring and all that i rly do not know...yeah someone mentioned the speedo thing.

On that yoke clip. I rly do not know what can and cant be done "custom" so that is why iam asking to know and not be suprised 🙂 
I know what it looks like  

[Kapr]

EDIT: Just a little info what my tranny is "doing" :
 

For the long time the trans do this "bad" sound:https://www.youtube.com/watch?v=qs_iTXgDt40

It is literally the same sound and same symptoms(when i push the clutch it quites down)

So is it really the shaft bearing?

 

Also: 

i found this on forums: The RB20 and SR20 boxes are nearly indentical inside (rb20 has longer mainshaft)and suffer badly from bearing and selector failures when driven hard

 

The bearing is true and selector failure kinda too...it is "harder" to get into gears specialy when i drive a little bit hard...

[GTSBoy]

The small boxes will wear out the input shaft bearings.....if and only if you seriously exceed the torque input that they were designed to handle. It is very common for them to give up after a few years behind boosted RB20s and if you put a 25 turbo in front of them they can't last forever.

Behind an NA RB20? Should last forever and ever and ever and ever. If it has died, it is from some sort of mistreatment, or perhaps extremely bad luck.

[Sxnjeet]

pretty much just finished my rb20neo + t and manual swap...let me tell you, it is a pain in the ass the first time. took me almost a year at this point trying to chase down minor issues. But, I think if I was to do it again, I could probably do it with almost 0 problems with how much troubleshooting experience ive gained lmao.

So either +T and upgrade the transmission, or just LS swap it and throw in a CD09 lmao. there ya go

[Kapr]

@GTSBoy Yeah i know. The RB20 has 180Nm torque and the gearbox "should" take up to 400Nm if you are not doing stuff like drag/drift or dumping clutch and of course then it is pure "luck" on how will it last.

My problem is (i think i said this in different post) that my car was very badly maintain so i would not be suprised if the oil in the gearbox was not changed until i bought it.

Yeah the gearbox seem little bit sad.

 

@Sxnjeet the +T seem very interesting but from where iam from it was nearly "impossible" to done right and not blow twice as money as just swap for the RB25.