Jump to content
SAU Community

Recommended Posts

How strong are rb25 gearboxes? I am looking to fit one to an sr20 that in its current tune has 270rwkw but after its rebuild hopefully 310-330. I can get a 2nd hand one for 1800-2200 or a brand new one for $3400. I have gone through more many sr20 gearboxes than i'd like to remember and are looking for the best solution without spending a few squillion $$. Thanks

Link to comment
https://www.sau.com.au/forums/topic/62865-rb25-gearbox-strength/
Share on other sites

Fitting one to an SR will cost a lot, the bell housings don't match up and I think you need a Tomei bellhousing?

But in any case, it costs about as much as the gearbox itself

A mate has 588hp on his SR S13 with an SR gearbox, they 'generally' hold up ... so 360 odd hp shouldn't be a hassle for your current gearbox

its not even about kws sproosy

just ask R32-GTS - he broke several boxes in his time. they dont like being leaned on, the size of the box means that the faces arnt big enough to disperse the loading placed on them, and as a result they break.

simply - drive them hard and they will go regardless of how much power your making, even pretty stock power can chew them

This is a little off topic, but how much power can an RB20 Box take on a R32 GTsT?

Cheers peoples!

just to go even a bit more off topic (sorry cool hand luke :Oops:), about how much would an r32 gts4t box handle? laying under the car it seems pretty damn big (havent seen a gtst box to compare though), even the floor inside is rasied either side of the tunnel to make room.

:cheers:

shaun

torque is what kills the poor old RB20 box.

put it behind 25/s and 25/30's and they wont last.

Behind an RB20 they can take a bit more punishemnt as its not pushing as much twist through it all.

nothing lasts forever. Remember RB20 boxes are getting quite old too these days :D

I am actually very happy with the rb20t box, if it went tomorrow I would be happy. :D

It has lasted the longest out of any gearbox I have owned.

Generally they all need a rebuild after 9 months. :D

The mightly VS 5speed included which I was told were almost indestructible.

The old 4speed single rails were fairly tough but always snapped selector forks and chewed out syncro's.

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

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...