Jump to content
SAU Community

Specs For R33 Stock Turbo (Rb25)

patrol_maverick
 Share

Recommended Posts

patrol_maverick Newbie

patrol_maverick

Posted
Posted

Does anyone know the specs for the stock RB25 turbo in an R33 1993 model (Series 1??) or can point me in the right direction. I've had a search and come up with nothing useful.

Anyway, What manufacturer/ model, How much power they're good for, How much boost is too much, component sizes, bearings, etc. Any & all specs.

Also a question relating to twin turbos: Is it OK to run 2 different size turbos?, say 3 cylinders feeding 1 turbo and 3 cylinders feeding the larger turbo?

I've got an R33 turbo and a GTIR turbo and I'm looking at building a twin turbo TD42 thats good down low in the rpm range as well as up higher. Basically my normal Patrol forum

doesn't cater for twin turbo info and other Skyline stuff so I came here for info.

If anyone has any GTIR Pulsar turbo info, that would be great too.

Link to comment
https://www.sau.com.au/forums/topic/355974-specs-for-r33-stock-turbo-rb25/
Share on other sites
DVS JEZ Grand Master

DVS JEZ

Posted
Posted

Stock rb turbo is useless. Throw it in the bin. With the patrol what do u expect to gain from a twin turbo setup compared to a single turbo that is matched perfectly for the size and rpm of the engine?

Msg hypergear, im sure he can tell u what turbo ro use on it

89CAL Grand Master

89CAL

Posted
Posted (edited)

Does anyone know the specs for the stock RB25 turbo in an R33 1993 model (Series 1??) or can point me in the right direction. I've had a search and come up with nothing useful.

Anyway, What manufacturer/ model, How much power they're good for, How much boost is too much, component sizes, bearings, etc. Any & all specs.

Also a question relating to twin turbos: Is it OK to run 2 different size turbos?, say 3 cylinders feeding 1 turbo and 3 cylinders feeding the larger turbo?

I've got an R33 turbo and a GTIR turbo and I'm looking at building a twin turbo TD42 thats good down low in the rpm range as well as up higher. Basically my normal Patrol forum

doesn't cater for twin turbo info and other Skyline stuff so I came here for info.

If anyone has any GTIR Pulsar turbo info, that would be great too.

2 Different size turbos in that configuration would make the thing drive really awful. Either use same size turbo for each lot of 3 cylinders or use 2 different size turbos in series/sequential etc.

But with those turbos I dont think your going to gain much/anything from a series/sequential setup. 4.2L Diesel is going to be inefficent with those turbos anyway. Do it properly or you will be disapointed you wasted your money

Edited by 89CAL
discopotato03 Grand Master

discopotato03

Posted
Posted

You would probably be better off looking into turbo diesel engines of your capacity and seeing what turbos they use as standard . This would give you a base line into sizing which is a good start .

Be vary carefull not to go too big on diesel turbos because you have a limited rev range to start with , also diesels mostly lower combustion temps means you can run a fair bit of boost without melting anything .

You get a bit of a free ride with detonation ignition too !

Also make sure the intercooling is adequate because diesels like good charge cooling as well .

A .

GTScotT Grand Master

GTScotT

Posted
Posted

Be it myself building a truck with a RB, I would simply have the factory turbo high flowed and give a description of the desired outcome to the machinist.

I think Hypergear will honestly be a great option for you. Simply tone down your expectations for top end power as you really dont want a top end turbo in a truck. A basic highflow however might see you VERY happy.

GL

  • 2 years later...
Frosty Grand Master

Frosty

Posted
Posted

You need to read articles about how turbos work. Have a Google.

you can't run two turbos, different sizes off only half a cylinder bank.

As for 25 stock turbos... Read the Dyno sticky thread yet?

synchronus charging?

Compound charging?

as apposed to a normal twin charging..has been done before, tho this is a waste of time in this situation specially with these 2 turbos..

build something like this in stead :)

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • hoodedreeper
      Chris' R34 GTT Series 2

      By hoodedreeper · Posted

      Sorry for resurrecting an oldish thread Not much has happened in the past year since the last update. The car did another 1000 miles or so and failed the MOT for the first time in October (failed on tyres which had been advised for a couple of years) In October the car got put up for sale and was removed in November due to no interest, being so close to christmas it was to be expected. The roads were dry in February so I decided to tax it early and get the new tyres fitted.   Fast forward to April, I got someone in to give the car a good clean after sitting for the winter.                                 The car got re-advertised and today (Saturday 3rd May) the car sold. The new owner is planning a GTR conversion at some point and a respray in the same pearl white. It's bitter sweet, it's a shame to have the car sit there for half the year and then only do 1000 miles. The kids are growing too quick and space in the back is getting limited. It's been a great 6.5 years of ownership
    • MBS206
      Rb26/30 build

      By MBS206 · Posted

      And if you want more power, more reliably, and cheaper, go get the Aussie RB... The 4L Barra and put that in instead.
    • MBS206
      Nismo rear spats

      By MBS206 · Posted

      No cats will keep discolouring the rear bar. Sends white paint a weird yellow stain. Cut and polish normally gets it out, but you'll be doing that every fortnight I found.
    • Butters
      Rb26/30 build

      By Butters · Posted

      Both heads will be equally reliable or unreliable depending on what you do to them.  Stock the RB26 head will flow more. You have access to the stock intake ITB manifold on the RB26 cheaply which flows really well(1000hp+).   Arguably more aftermarket support for RB26, though in Aus we love our RB30 SOHC heads too.    The only downsides to the RB26 head is if you have a VL commodore and want to keep the SOHC look.  Where you may have an issue is drilling out the rb30 block for the bigger head studs but if you are building a big power motor you'd probably put bigger studs on the SOHC head too.  This is just about finding a good machine shop, sometimes easier said than done.  RB30 head worked can make big power just like a Rb26 head, so really it actually more comes down to what your preference is for your car.  People now even making billet versions of both.
    • GTSBoy
      Rb26/30 build

      By GTSBoy · Posted

      2630s work perfectly well. There is something to be said for just using the 30 head, as it saves all the pain of the conversion, still makes tons of power, still sounds cool, etc etc. 2630 will obviously make more power again, but the differences are not stupidly big. It really depends on whether you're racing for sheep stations or not. If it's dead serious, then it's a 26 head. If it's just for fun, it could go either way. But the 26 head and the effort to get it set up, etc etc, is part of the fun.
×
×
  • Create New...