• Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


Sign in to follow this  
Tyler Elms

RB25DET Neo Swap

Recommended Posts

Hey guys,

I'm planning on doing an engine swap of an RB25DET Neo into an R34 GT and  I just wanted to check I'm on the right track and not missing any parts! The engine I'm looking to buy comes with 

*Ecu 
*Complete uncut loom 
*Coils with inbuilt igniters 
*turbo and manifold 
*Complete intake including and injectors 
*J pipe 
*Alternator 

As far as i know all I still need is an intercooler and piping

Share this post


Link to post
Share on other sites

Exhaust? Whats happening with your gearbox? Even if its factory manual you'll probably want a clutch. The brakes might need some attention too. 

 

I'm not too familiar with NEO but I believe they have a boost sensor that goes to the ecu, and of course you need the AFM.

Share this post


Link to post
Share on other sites
Exhaust? Whats happening with your gearbox? Even if its factory manual you'll probably want a clutch. The brakes might need some attention too. 
 
I'm not too familiar with NEO but I believe they have a boost sensor that goes to the ecu, and of course you need the AFM.
Should've mentioned I'll be doing the clutch! Brakes are already bigger than factory too thanks man! Ahh exhaust, how'd I not think of that!

Share this post


Link to post
Share on other sites

What is a j pipe?

Share this post


Link to post
Share on other sites

Will need a gearbox.  The NA box will tap out after a year at the most.  Just not strong enough for the torque load.

Will need a fuel pump.

Will need an AFM.

Will need that boost sensor, but it should be on the engine.

Share this post


Link to post
Share on other sites

Thanks for this guys, Fuel pump and AFM are added to the list!

Gearbox will come when this one breaks, sadly cant afford it all at once :(

Share this post


Link to post
Share on other sites

My advice is to sell your car, buy a GT-t

You'll save money, time, updating your registration with a new motor, etc.

But if you're dead set on doing the conversion then don't forget the boost sensor and popping in a better fuel pump.

R34 ECUs are retarded, without it the car runs like shit. Even when on Nistune, without it connected the TP Load Index goes mental, I found out the hard way when I tuned a customer's car. I disabled the boost sensor flags, upped all the voltage limits to avoid it trigger a DTC and guess what? Still went mental. Got in touch with Nistune support and they said it's paramount you connect the sensor regardless of boost or if it is disabled 

Share this post


Link to post
Share on other sites
My advice is to sell your car, buy a GT-t
You'll save money, time, updating your registration with a new motor, etc.
But if you're dead set on doing the conversion then don't forget the boost sensor and popping in a better fuel pump.
R34 ECUs are retarded, without it the car runs like shit. Even when on Nistune, without it connected the TP Load Index goes mental, I found out the hard way when I tuned a customer's car. I disabled the boost sensor flags, upped all the voltage limits to avoid it trigger a DTC and guess what? Still went mental. Got in touch with Nistune support and they said it's paramount you connect the sensor regardless of boost or if it is disabled 
I thought about going this route but it seems to cost almost double in every situation considering it's about 22k+ for a gtt in NZ and 3.5 for an engine ️, but thanks man fuel pump is definitely on the list and I'll make 100% sure about that boost sensor!

Share this post


Link to post
Share on other sites
38 minutes ago, Tyler Elms said:

I thought about going this route but it seems to cost almost double in every situation considering it's about 22k+ for a gtt in NZ and 3.5 for an engine emoji852.png️, but thanks man fuel pump is definitely on the list and I'll make 100% sure about that boost sensor!

wow... they're like 12~14k here in Australia.

Just move over here, might be cheaper in the long run lol

Share this post


Link to post
Share on other sites
wow... they're like 12~14k here in Australia.
Just move over here, might be cheaper in the long run lol
Hahahaha it's tempting! Could be worth an import! That's an insane difference though

Share this post


Link to post
Share on other sites
13 minutes ago, Dose Pipe Sutututu said:

wow... they're like 12~14k here in Australia.

Just move over here, might be cheaper in the long run lol

The hell you doing inviting more bloody Kiwis to move here?  Sydney is already Auckland's biggest suburb.

Share this post


Link to post
Share on other sites

Wow didn't realise how much cheaper R34 were in aus, although its not quite that bad, you can pick up a coupe gtt here for 18-19k if you hunt around.

3 hours ago, GTSBoy said:

Will need a gearbox.  The NA box will tap out after a year at the most.  Just not strong enough for the torque load.

I disagree with that, I had factory manual R33 20e that had been swapped to rb25det and the gearbox was fine after around 10 years on the factory turbo. Plenty of people drift with the 20e/20det style gearbox with 300+kw and get decent life out of the trans.

Share this post


Link to post
Share on other sites
Wow didn't realise how much cheaper R34 were in aus, although its not quite that bad, you can pick up a coupe gtt here for 18-19k if you hunt around.
I disagree with that, I had factory manual R33 20e that had been swapped to rb25det and the gearbox was fine after around 10 years on the factory turbo. Plenty of people drift with the 20e/20det style gearbox with 300+kw and get decent life out of the trans.
I haven't seen any that low in ages! I'm happy with an engine swap anyways and good to know about the box! Thanks dude

Share this post


Link to post
Share on other sites
57 minutes ago, KiwiBoat said:

Wow didn't realise how much cheaper R34 were in aus, although its not quite that bad, you can pick up a coupe gtt here for 18-19k if you hunt around.

I disagree with that, I had factory manual R33 20e that had been swapped to rb25det and the gearbox was fine after around 10 years on the factory turbo. Plenty of people drift with the 20e/20det style gearbox with 300+kw and get decent life out of the trans.

I disagree with your disagree. It might live 10 years in might live 10 minutes, 20 box behind a 25 is a complete lucky dip.

Share this post


Link to post
Share on other sites
11 minutes ago, iruvyouskyrine said:

I disagree with your disagree. It might live 10 years in might live 10 minutes, 20 box behind a 25 is a complete lucky dip.

Thats kind of the story with any used gearbox though, especially 20+ years old. If its in ok condition and you have some mechanical sympathy its not like they are made of glass.

On another note, Ive seen 25det boxes on here for $1000-1500 which is crazy, you are out about $2500-3000 in NZ for one.

Share this post


Link to post
Share on other sites

I disagree with your disagree doubly.  I have personally had 2x 20DET gearboxes suffer from input bearing death just with the increased torque load from a boosted 20 making only ~175rwkW.  My mechanical sympathy levels are off the fricking charts too.  I have also seen a large number of other 20DET and 25DE suffer short lives with 25 turbos in front of them.

The little gearboxes are not glass....they are rubber.  They are as flexible as a piece of boiled spaghetti and it f**ks about with the bearing life terribly.

Share this post


Link to post
Share on other sites

I have multiple 25DET boxes, maybe I should start selling them to kiwis to turn a tidy profit! What's $2500 sheep dollars worth in AUD anyway

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this