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R32 Gts-4 Rb25det Conversion

GTS4onP
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  • 12 years later...
BK Grand Master

BK

Posted
Posted
On 17/07/2021 at 5:52 AM, schowdhry said:

hello from the year 2021 blind elk if your still on here i need your help! i have just swapped the rb25 neo into my gts4, all the mechanical work is done but i need help with wiring up the ecu! 

@blind_elk

  • 7 months later...
esse999 Newbie

esse999

Posted
Posted
On 17/07/2021 at 6:22 AM, schowdhry said:

hello from the year 2021 blind elk if your still on here i need your help! i have just swapped the rb25 neo into my gts4, all the mechanical work is done but i need help with wiring up the ecu! 

Are you available to chat with about this conversion ??

  • 2 months later...
corbic Apprentice

corbic

Posted
Posted
On 11/16/2008 at 3:16 PM, blind_elk said:

Sorry, but that's rubbish. When I did the swap in mine, it all just swapped over.

This is Rubbish information and basically screwed up my build plans. 

 

RB25DET (Neo) does not use the same AWD oil pan as the RB20.  The Pan's do not swap. Bolt holes are not aligned. I'll have more photos when I pick it up from the shop. 

 

So to be specific as possible, since every thread I find about this information is vague and useless. 

 

 

1989 GTS-4 Coupe - AWD - Turbo RB20DET 5spd Manual. 

Engine  - RB25DET NEO - Stagea - most likely automatic car. 

 

Car in Question 

 

IMG_20210510_152439.thumb.jpg.067204d9eb6cb415c07435d06db840f1.jpg

 

Engine

IMG_20210429_122841.thumb.jpg.d39938a742f75efc3df061314ffa2659.jpg

RB25DET NEO AWD PAN

20220518_171456.thumb.jpg.73818ee2fb8d51101fa0f6d4a6ab45e7.jpg

RB20DET AWD PAN

20220518_171538.thumb.jpg.291f0f04d4d14ad2c6cf598be6b25d78.jpg

corbic Apprentice

corbic

Posted
Posted
On 7/16/2021 at 1:22 PM, schowdhry said:

hello from the year 2021 blind elk if your still on here i need your help! i have just swapped the rb25 neo into my gts4, all the mechanical work is done but i need help with wiring up the ecu! 

Did you swap the Ring and Pinion? 

 

How much a PITA Is it to shim the front differential. From what I can tell there is two thrust washer with 6 various sizes each for sides and two washers with almost 10 each options for the pinion depth along with a pinion sleeve that comes in 6 sizes. 

There is almost 1.65mm of depth tolerance stacking and with each of these washers/shims running for $5, that's almost $500 to get enough to play whack a mole with setting up the R&P pattern. 

GTSBoy Grand Master

GTSBoy

Posted
Posted
On 5/20/2022 at 1:05 PM, corbic said:

There is almost 1.65mm of depth tolerance stacking and with each of these washers/shims running for $5, that's almost $500 to get enough to play whack a mole with setting up the R&P pattern.

That's why I always just give it to my trusted diff guy to put my Frankendiffs back together.

corbic Apprentice

corbic

Posted
Posted
On 5/19/2022 at 10:19 PM, GTSBoy said:

That's why I always just give it to my trusted diff guy to put my Frankendiffs back together.

I'm state side, so while I have two great diff shops near by, neither is going to stock GTR/Nissan shims. 

corbic Apprentice

corbic

Posted
Posted
On 5/19/2022 at 10:47 PM, GTSBoy said:

No, but they can use whatever shim they have, measure the difference with feeler gauges (or whatever alternative approach they may choose) and then buy appropriate shims as required. Not really any different over here.

Shims are unique to the GTR/Nissan.  A local shop may determine that a longer sleeve is needed, but they are not going to be able to call up NAPA Auto Parts or a Nissan Dealer and pick up a sleeve. 

Also, looking at the FSM - it looks like there is a pressed on bearing for the Snub - sooo I doubt any shop is going to have a dummy bearing to get the initial depth without having to press on - press off the bearing a dozen times. 

 

$150/hr experimenting with all this is going to turn into a $2000 shop bill real quick if I went that route. 

 

 

GTSBoy Grand Master

GTSBoy

Posted
Posted

Le sigh. The shim you want to leave in there may unique to the R200. But I can guarantee you that any decent shop will have OTHER SHIMS THAT WILL FIT, even if they have to bore the inner diameter out or scrape some off the outer diameter, to use as a bloody reference.

It hasn't cost me much to have my trusted diff shop do it.

  • 1 month later...
corbic Apprentice

corbic

Posted
Posted

As you can see the Pan's are completely different. The RB25 pan is a different bolt pattern and the axle tube + differential are mounted forward.  The Axle is nearly touching the oil sump and there is an additional 3 inch gap between the differential flange and the end bellhousing plane. 

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