Jump to content
SAU Community

Recommended Posts

Ive heard a few people converting a GTR box to rwd, how hard is it? the welding wont be a problem, but not sure whats

involved with the guts of the transfer case, also will a 20 clutch fit or is the gtr box input shaft bigger? Thanks Luke

Edited by boostn32
Link to comment
https://www.sau.com.au/forums/topic/327844-gtr-box-converted-to-rwd/
Share on other sites

Shop around, i paid $1300 for mine with a tailshaft/yoke etc.

GTR gearboxes go for around what, $1100 and its time and effort.

Not to mention depending on the previous life - you could be easily breaking 3rd gear as well.

I'd never go near a GTR box in RWD TBH.

you gave no reason and for that i see no reason

They have a harder life and shred 3rd gear a lot, for only saving $200 you have to modify the box quite a lot and then run the risk of it being in far worse condition than the 2wd box. Not worth it for a $200 saving.

This is essentially what nismoid said.

Edited by Rolls

But it is a good question. R32 GTR gearboxes can be had for as little as $500 (Yes I know, what is the condition)

But the reason I am interested is it opens up a world of possibilities for me :) I would love to buy a GTR box that is for sale at the moment that has a full OS Giken close ratio 5 spd gear set in it. Throwing a GTR box in my R32 GTSt also means that I could probably use a botl in R32 carbon propshaft with the GTR rear cradle I have to install in the car.

So, if someone knows whats involved then I am interested, because it means I can do some cool stuff to my drivetrain that will actually make my car quicker, not just more reliable as is the case with the RB25 box. It is more appealing to mod a gbox housing then get custom length carbon propshaft and buy the OS Giken gearset new and install it....

But it is a good question. R32 GTR gearboxes can be had for as little as $500 (Yes I know, what is the condition)

But the reason I am interested is it opens up a world of possibilities for me :) I would love to buy a GTR box that is for sale at the moment that has a full OS Giken close ratio 5 spd gear set in it. Throwing a GTR box in my R32 GTSt also means that I could probably use a botl in R32 carbon propshaft with the GTR rear cradle I have to install in the car.

So, if someone knows whats involved then I am interested, because it means I can do some cool stuff to my drivetrain that will actually make my car quicker, not just more reliable as is the case with the RB25 box. It is more appealing to mod a gbox housing then get custom length carbon propshaft and buy the OS Giken gearset new and install it....

Glad someone's not arrogant. it was a simple question, maybe to simple for some.

and to add i have found a gtr box that has been converted and had new syncros, and also another gtr box with tailshaft for less than 1k.

for those that say they would never touch one i would rather listen to some one that knows a bit more. There advice its a better option than a 25 box and proven.

Edited by boostn32

It's not a better option and there is no way they can prove that it is.....basically, an RB26DETT gearbox is an RB25DET gearbox with a transfer case on the back. Not only do you have more weight hanging off the back due to the Attessa clutch drum, but you have also got to factor in the cost of modifying your tailshaft as the GTR one is different.

The clutches are the same as long as you get an R32 GTR gearbox pre 07/91 and it's a push type. They are all the same....RB20, 25, 26 etc.

There is no strength gain from going to RB26 gearbox as the internals are identical to RB25.

I just find it awkward that you would want to hack apart a GTR gearbox when it will cost roughly the same to buy an RB25 one that will go straight in, will be as strong, and will not have as much rotational mass to turn as the butchered GTR one.

On the subject of why a GTR box is not going to be as strong....that is only true for second hand ones that have not been rebuilt. Because more torque and more revs are usually put through them, 2nd, 3rd and 5th synchros cop a punishment...but that goes the same mostly for the RB25 ones getting around. As soon as ppl stop paying $1500+ for f**ked RB25 boxes, then the prices will start coming down to 'fair' levels.

Arrogant? Oh please.

If you want to throw around words. - I think you are being rather ignorant of the situation & realistic costs.

The "best" of the GTR 5-speed is the R33 SIII (S3) GTR box. Same box you require if you want to fit a OS gearset for instance.

Series 1&2 boxes need additional parts to be purchased as part of the gearset install.

So clearly here there is a difference, and S3 boxes sell for what i said above. By all means gamble your money on a cheaper box, however check with your local casino what the odd's are for betting on black before you do so.

hey,

I am currently half way through doing two of these conversions. Im doing the first one becasue my mate had a GTR he crashed and we are putting the motor and box into his s13. And the other one Im doing because I know how easy it is, and I had a rb25 in my r32 with a rb20 gearbox, so I got a RB26 box for $600 delivered to nth qld from adelaide.

Basically if you blow a box you can just pull off the rear housing and bolt it onto a new rb26 box. I pulled all the clutch packs off it and gutted the silent chain and angle grinded the transfer case off it. Keep an eye on my build thread in the projects and overhauls topic. I havent finished even the initial post in there but once I do I will post up pics of the modded transfer case.

I think its a great idea if you have a rb26 box laying around. They can be had for so cheap

Arrogant? Oh please.

If you want to throw around words. - I think you are being rather ignorant of the situation & realistic costs.

The "best" of the GTR 5-speed is the R33 SIII (S3) GTR box. Same box you require if you want to fit a OS gearset for instance.

Series 1&2 boxes need additional parts to be purchased as part of the gearset install.

So clearly here there is a difference, and S3 boxes sell for what i said above. By all means gamble your money on a cheaper box, however check with your local casino what the odd's are for betting on black before you do so.

now thats all worth adding to this post, and i will take it all on board as its usefull information, yes i understand where your comming from now.

choku_dori i will keep an eye on your box transfermation...

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


  • Similar Content

  • Latest Posts

    • OK, so again it has been a bit of a break but it was around researching what had been done since I didn't have access to Neil's records and not everything is obvious without pulling stuff apart. Happily the guy who assembled the engine had kept reasonable records, so we now know the final spec is: Bottom end: Standard block and crank Ross 86.5mm forgies, 9:1 compression Spool forged rods Standard main bolts Oil pump Spool billet gears in standard housing Aeroflow extended and baffled sump Head Freshly rebuilt standard head with new 80lb valve springs Mild porting/port match Head oil feed restrictor VCT disabled Tighe 805C reground cams (255 duration, 8.93 lift)  Adjustable cam gears on inlet/exhaust Standard head bolts, gasket not confirmed but assumed MLS External 555cc Nismo injectors Z32 AFM Bosch 023 Intank fuel pump Garret 2871 (factory housings and manifold) Hypertune FFP plenum with standard throttle   Time to book in a trip to Unigroup
    • I forgot about my shiny new plates!
    • Well, apparently they do fit, however this wont be a problem if not because the car will be stationary while i do the suspension work. I was just going to use the 16's to roll the old girl around if I needed to. I just need to get the E90 back on the road first. Yes! I'm a believer! 🙌 So, I contacted them because the site kinda sucks and I was really confused about what I'd need. They put together a package for me and because I was spraying all the seat surfaces and not doing spot fixes I decided not to send them a headrest to colour match, I just used their colour on file (and it was spot on).  I got some heavy duty cleaner, 1L of colour, a small bottle of dye hardener and a small bottle of the dye top coat. I also got a spray gun as I needed a larger nozzle than the gun I had and it was only $40 extra. From memory the total was ~$450 ish. Its not cheap but the result is awesome. They did add repair bits and pieces to the quote originally and the cost came down significantly when I said I didn't need any repair products. I did it over a weekend. The only issues I had were my own; I forgot to mix the hardener into the dye two coats but I had enough dye for 2 more coats with the hardener. I also just used up all the dye because why not and i rushed the last coat which gave me some runs. Thankfully the runs are under the headrests. The gun pattern wasn't great, very round and would have been better if it was a line. It made it a little tricky to get consistent coverage and I think having done the extra coats probably helped conceal any coverage issues. I contacted them again a few months later so I could get our X5 done (who the f**k thought white leather was a good idea for a family car?!) and they said they had some training to do in Sydney and I could get a reduced rate on the leather fix in the X5 if I let them demo their product on our car. So I agreed. When I took Bec in the E39 to pick it up, I showed them the job I'd done in my car and they were all (students included) really impressed. Note that they said the runs I created could be fixed easily at the time with a brush or an air compressor gun. So, now with the two cars done I can absolutely recommend Colourlock.  I'll take pics of both interiors and create a new thread.
    • Power is fed to the ECU when the ignition switch is switched to IGN, at terminal 58. That same wire also connects to the ECCS relay to provide both the coil power and the contact side. When the ECU sees power at 58 it switches 16 to earth, which pulls the ECCS relay on, which feeds main power into the ECU and also to a bunch of other things. None of this is directly involved in the fuel pump - it just has to happen first. The ECU will pull terminal 18 to earth when it wants the fuel pump to run. This allows the fuel pump relay to pull in, which switches power on into the rest of the fuel pump control equipment. The fuel pump control regulator is controlled from terminal 104 on the ECU and is switched high or low depending on whether the ECU thinks the pump needs to run high or low. (I don't know which way around that is, and it really doesn't matter right now). The fuel pump control reg is really just a resistor that controls how the power through the pump goes to earth. Either straight to earth, or via the resistor. This part doesn't matter much to us today. The power to the fuel pump relay comes from one of the switched wires from the IGN switch and fusebox that is not shown off to the left of this page. That power runs the fuel pump relay coil and a number of other engine peripherals. Those peripherals don't really matter. All that matters is that there should be power available at the relay when the key is in the right position. At least - I think it's switched. If it's not switched, then power will be there all the time. Either way, if you don't have power there when you need it (ie, key on) then it won't work. The input-output switching side of the relay gains its power from a line similar (but not the same as) the one that feeds the ECU. SO I presume that is switched. Again, if there is not power there when you need it, then you have to look upstream. And... the upshot of all that? There is no "ground" at the fuel pump relay. Where you say: and say that pin 1 Black/Pink is ground, that is not true. The ECU trigger is AF73, is black/pink, and is the "ground". When the ECU says it is. The Blue/White wire is the "constant" 12V to power the relay's coil. And when I say "constant", I mean it may well only be on when the key is on. As I said above. So, when the ECU says not to be running the pump (which is any time after about 3s of switching on, with no crank signal or engine speed yet), then you should see 12V at both 1 and 2. Because the 12V will be all the way up to the ECU terminal 18, waiting to be switched to ground. When the ECU switches the fuel pump on, then AF73 should go to ~0V, having been switched to ground and the voltage drop now occurring over the relay coil. 3 & 5 are easy. 5 is the other "constant" 12V, that may or may not be constant but will very much want to be there when the key is on. Same as above. 3 goes to the pump. There should never be 12V visible at 3 unless the relay is pulled in. As to where the immobiliser might have been spliced into all this.... It will either have to be on wire AF70 or AF71, whichever is most accessible near the alarm. Given that all those wires run from the engine bay fusebox or the ECU, via the driver's area to the rear of the car, it could really be either. AF70 will be the same colour from the appropriate fuse all the way to the pump. If it has been cut and is dangling, you should be able to see that  in that area somewhere. Same with AF71.   You really should be able to force the pump to run. Just jump 12V onto AF72 and it should go. That will prove that the pump itself is willing to go along with you when you sort out the upstream. You really should be able to force the fuel pump relay on. Just short AF73 to earth when the key is on. If the pump runs, then the relay is fine, and all the power up to both inputs on the relay is fine. If it doesn't run (and given that you checked the relay itself actually works) then one or both of AF70 and AF71 are not bringing power to the game.
    • @PranK can you elaborate further on the Colorlock Dye? The website has a lot of options. I'm sure you've done all the research. I have old genuine leather seats that I have bought various refurbing creams and such, but never a dye. Any info on how long it lasts? Does it wash out? Is it a hassle? What product do I actually need? Am I just buying this kit and following the steps the page advises or something else? https://www.colourlockaustralia.com.au/colourlock-leather-repair-kit-dye.html
×
×
  • Create New...