Rb30/25 Turbo Upgrade

[megzz]

Hi Guys,

I bought myself an R31 with the following mods

RB30/25DET

3inch turbo back

Splitfire coils

Stock AFM

PowerFC

Eboost2 Controller

R33 GB

4.11 Full Spool

At the moment i am running the stock RB25 turbo and have been told to change it as A it is tool small for the engine size and B it is known to fall apart. I am running it 11 pound boost at the moment but I want to do a lot of track days in it and i don't want any dramas.

Should i have my current turbo rebuilt using no ceramic materials or B replace it with a different model. If so i have absolutely no idea about Turbos so which model do people usually run. I am looking for something that will be a straight swap while keeping my current exhaust manifold. I was told that a XR6 Turbo fits straight in. Could this be confirmed? I am not chasing big power over my current setup but whatever extra I get is a bonus. I am also a fan low down boost.

Cheers

[GTScotT]

Be it myself I would want to give the Hypergear ATR43 G3 a go on a 30DET.

They do a neat 300kw on an RB25, should be nice responsive on a 30DET too.

Pretty sure they are close to a grand too, and use the factory dump pipes flange etc.. So its very easy to bolt up. XR6 will need a custom dump and not be as responsive.

[R31Nismoid]

GT3076

Read the RB30 hybrid dyno thread.

Find user "Al" - graph speaks for itself.

[discopotato03]

Yes thats what I'd do , and if I wanted it to rev I'd use the 1.06 A/R Garrett GT30 turbine housing as well .

A .

[urtwhistle]

or a hypergear GT3576 like mine. very nice on my Rb30

[bubba]

I've got a custom highflow from Per4manz, supposed to be good for 400rwhp and handle 24psi.

It's almost as responsive as a stock turbo! 3rd gear with 1/4 throttle I'm seeing positive pressure by 2500rpm and 10psi by 3000rpm. In 5th gear at 1800rpm, start to feed it some gas and it's in positive pressure pretty much instantly!

Only started it on the weekend, rich as hell, putting some km's on it (car has been off the road for 18months so making sure everything works!) and will get it tuned soon then report back

[megzz]

cheers guys, Is there a write up anywhere that explains what the differences between different turbine housings, flanges etc?

[Room42]

I've got a custom highflow from Per4manz, supposed to be good for 400rwhp and handle 24psi.

It's almost as responsive as a stock turbo! 3rd gear with 1/4 throttle I'm seeing positive pressure by 2500rpm and 10psi by 3000rpm. In 5th gear at 1800rpm, start to feed it some gas and it's in positive pressure pretty much instantly!

Only started it on the weekend, rich as hell, putting some km's on it (car has been off the road for 18months so making sure everything works!) and will get it tuned soon then report back

I had a chat with Grant about the high flows he does. I didn't end up getting one done as he said it was going to cost $1400. He said they are very similar to TO4E specs and do their best work at 16 psi. $1400 is almost half of a 'proper' external setup so I went with that. Will be good to see some results with it tho. What computer are you using?

Edited August 26, 2011 by Room42

[bubba]

http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_systems_tech_center.html

[bubba]

I had a chat with Grant about the high flows he does. I didn't end up getting one done as he said it was going to cost $1400. He said they are very similar to TO4E specs and do their best work at 16 psi. $1400 is almost half of a 'proper' external setup so I went with that. Will be good to see some results with it tho. What computer are you using?

Well it came with my wagon, got Grant to rebuild it for a VERY good price before I put it in the 32 (also going from a 2.5L to a 3L was very interesting with this turbo).

RB20 NIStune (R32 RB25DE head)

Can't wait to get it tuned, feels like it's going to be an absolute ball tearer!

[Room42]

Well it came with my wagon, got Grant to rebuild it for a VERY good price before I put it in the 32 (also going from a 2.5L to a 3L was very interesting with this turbo).

RB20 NIStune (R32 RB25DE head)

Can't wait to get it tuned, feels like it's going to be an absolute ball tearer!

I think it will go pretty good. Especially on a 3L. It will come on boost quicker than a honeymooners dick on wedding night Are you tuning it yourself or putting it on the dyno?

[bubba]

I think it will go pretty good. Especially on a 3L. It will come on boost quicker than a honeymooners dick on wedding night Are you tuning it yourself or putting it on the dyno?

It was a tad laggy in the wagon but on the 3L it feels pretty awesome!

I was trying to tune it myself but my consult cable died on the weekend I have also come to the realisation that I know enough to be dangerous and that my best course of action will be to pay someone who knows what they're doing to tune it and then go through the maps to try and learn something.

[koe]

I love my t78-33D

This is with no boost controller.

Only a .7 bar wastegate spring

Rev limit set to 6,000 rpm

Custom diff long gears.

I never went pass 5.500 rpm

Trust me what most talk about this turbos are just non sense

This one has 5yrs with me

Edited August 26, 2011 by koe

[megzz]

Thanks Koe,

Are you running an SR20 or RB?

Also what do you use your car for. The reason I ask is that I'm starting to do circuit events and the car is already as tail happy as it is. So I am not after any more shear horsepower (For the time being anyway) I am just after similar to stock RB25 turbo running 11PSI and power that comes on early and revs to 7000 as the engine does at the moment.

[bubba]

Thanks Koe,

Are you running an SR20 or RB?

Also what do you use your car for. The reason I ask is that I'm starting to do circuit events and the car is already as tail happy as it is. So I am not after any more shear horsepower (For the time being anyway) I am just after similar to stock RB25 turbo running 11PSI and power that comes on early and revs to 7000 as the engine does at the moment.

Posted elsewhere but here you go, the biggest highflow that would fit in stock housings (OP6 rear housing). Stock 30E bottom end so rev limit set to 6000rpm and also 3.9:1 diff gears. Only running 10psi on a shitty tune..