Help Me Choose A New Turbo Setup

[im late]

Hey All,

This is my current setup at 445RWHP @ 20PSI:

Block:

Block O-Ringed, Line bored, Bored to 87mm and torque plate honed

Arias 87mm Forged Pistons

Argo Conrods

N1 Water Pump

N1 Rings

N1 NDC bearings

Genuine Nissan R33 GTR Crank

Complete bottom end balance (Clutch/flywheel, rods, pistons and crank)

Jun Oil Pump

ATI Harmonic Balancer

GReddy Light Weight Pulley Kit

ARP Main Stud and Rod bolts Kit

Trust Sump Extension, baffle and pickup

Nismo Engine mounts

Complete Silicone Heater/Coolant Hose Kit

Head:

Head fully serviced by Head Exchange WA

Head machined to accept Jun cams

HKS 1.6mm head gasket

HKS Metal intake and exhaust gaskets

Jun 272 10.5mm Cams

Tomei Cam Studs

Tomei Adjustable cam gears

ARP Head Studs

Jun Valve Guides

Jun Valve Springs

Precision valve shims

Splitfire Coilpacks

Fuel system:

Sard Dual Entry Fuel Rail

Sard 800cc Injectors

Sard Fuel Pressure Regulator

Bosch 044 pump mounted internally

Forced Induction:

2 x Garrett GT2860R-5 Turbos (Rear housings ceramic coated by CIC)

2 x 6-Boost steam pipe manifolds (Low mount, ceramic coated by CIC)

Braided Oil and Water turbo lines with Speedflow fittings

Exhaust:

Trust Extension Split Dumps (Ceramic coated by CIC)

Trust 90mm Front Pipe (Ceramic coated by CIC)

3.5” Ballistic Metal Cat

Apexi N1 3.5” Cat back

This setup used to have a T04Z. It was bulk power but was not really useable for street duties or light track which is why I sold it off last year.

Then I got the 2860R-5's. It has better response than the T04Z but still not really suitable for my liking.

I really want the power/response setup and I am stuck for a choice.

I am looking for close to stock turbo response but with a lot more power. I am used to the power of the T04Z (mine was doing 575RWHP) but I am hoping someone out there has a turbo setup that provides over 450RWHP but has close to stock response.

This might be a long shot but any opinions are welcome. You can bag me out for not keeping the T04Z or wanting to ditch the 2860R-5's

In case this makes a difference I don't really have a budget. However of course I only want to spend on what is proven and not a waste of money (I have done that too many times in the past)

Oh, also I only want to stick to the twin low mount setup.

[N1GTR]

-7's wound right up?

R34N1's maybe?

Hard to tell what you're after as you want stock like response with 450rwhp and low mount twins, you've already got what most would consider a perfect setup

[im late]

-7's wound right up?

R34N1's maybe?

Hard to tell what you're after as you want stock like response with 450rwhp and low mount twins, you've already got what most would consider a perfect setup

Hi Steve

X-Speed told me (last year in an email) they can tune GT-SS's to 400RWKW (which would be awesome)... GT-SS's = GT2860-7's.

I might go down that path if I hear of alot more people around SAU land that have a similar setup with -7's and doing around 400RWKW's!!!

My current turbo setup is awesome for bulk power. But my car is used on the freeways and streets of perth so response is more important to me than outright top end power.

I would have just kept the T04z coz that made me shit my pants the first time I put the foot down!!!!!

Maybe one day when I have enough funds I WILL build a drag monster with bulk skid power!!!!!!!!!!!!!!!!!!!!!!!!

[TiTAN]

GT-SS/-7's wont make 400kw without some giggle gas, they just cant flow the air for that ~320kw tops.

The turbos you have now are the ones you would be told to get for the power you are after. if you want more response you need to look at increasing displacement.

[im late]

Thanks for your comment TiTAN,

Yes you are right for sure. I guess a 2.8 would be the go.

Bloody Jap Yen.... It’s going to hurt my mortgage but you only live once.....

Maybe I'll post a wanted ad to see who has a 2.8 kit lying around

[R31Nismoid]

GT-SS/-9's will do ~ 330rwkw on around 20-22psi or there about with blistering response - as good as you'll get for 300rwkw put it that way.

Although the -5's should be getting 500rwhp+ on 20psi.

One thing though, big cams doesn't suit response from what i've seen on every RB26 here, all are using stock cams even upto 380rwkw

Every tuner has their idea's about that though.

[im late]

GT-SS/-9's will do ~ 330rwkw on around 20-22psi or there about with blistering response - as good as you'll get for 300rwkw put it that way.

Although the -5's should be getting 500rwhp+ on 20psi.

One thing though, big cams doesn't suit response from what i've seen on every RB26 here, all are using stock cams even upto 380rwkw

Every tuner has their idea's about that though.

Hey Ash

Good point about the cams.

If I upgrade to 2.8, will that be more suitable for the cams? (in your opinion).

[Slide]

Tomei B7660

Between GTRS and GTSS

[im late]

Thanks Slide for the link

However I have question, when these turbos eventually will need a rebuild, who in Australia will be able to do it?

[R31Nismoid]

Hey Ash

Good point about the cams.

If I upgrade to 2.8, will that be more suitable for the cams? (in your opinion).

Depends on the turbo choice and so on

[Slide]

They cartridge and bearing assembly is Garrett specifications just like HKS.

The turbine wheel and compressor wheel on any ball bearing turbo that need to be rebuilt tends to cause some housing damage which will require slightly larger internals be used.

Garrett internals can then be used or even HKS for that matter and the turbo can be serviced by anyone capable like Garrett, Precision, GCG, MTQ etc.

The benefits of the current wheel types are for response with the compressor setup just a little smaller than the -5 and the turbine having a different wheel design but the same size.

If there was a Garrett bolt on option in between the -5 and -7 it would be perfect and much cheaper given the current exchange rate though Garrett work backwards and provide what we don't need not what we do. We just adapt

[jonn]

Stick with the -5's and go the 2.8. Have a search for Gav's dyno sheet (built by XSpeed) and take a look at the respone whilst still making 550+rwhp.

I've got a similar setup but using the 2530's, now tuned for response over outright hp. My dyno sheet below.

[Lithium]

I would have just kept the T04z coz that made me shit my pants the first time I put the foot down!!!!!

Maybe one day when I have enough funds I WILL build a drag monster with bulk skid power!!!!!!!!!!!!!!!!!!!!!!!!

Hmm if I were in your position when you wanted the same power with less lag I would have looked into shifting to an RB30, I had the distinct pleasure of going for a ride in an R33 GTR with a RIPS RB30+T04Z combination and the thing was mental from everywhere. It'd crush a stock turbo RB26DETT setup basically from idle up.

[bigmikespec]

Working backwards 445hp is about 335kW, does that not seem low with -5's?

[(OO)SKYLINE(OO)]

Found a GTR Turbo chart.

Might help you decide.

[N1GTR]

Hi Steve

X-Speed told me (last year in an email) they can tune GT-SS's to 400RWKW (which would be awesome)... GT-SS's = GT2860-7's.

I might go down that path if I hear of alot more people around SAU land that have a similar setup with -7's and doing around 400RWKW's!!!

My current turbo setup is awesome for bulk power. But my car is used on the freeways and streets of perth so response is more important to me than outright top end power.

I would have just kept the T04z coz that made me shit my pants the first time I put the foot down!!!!!

Maybe one day when I have enough funds I WILL build a drag monster with bulk skid power!!!!!!!!!!!!!!!!!!!!!!!!

There's a place in Sydney that have an R34 with 2.6L, GTSS and 355rwkw. Lots and lots of money spent on the head, but i dont know 100% if the turbos are stock or if they've been modified

[femno]

I reckon GT-SS would choke the 2.8's power potential...if I spent all that money on the 2.8 id want some decent power out of it..nothing short of 400, which would easily be achievable without excess lag given the extra displacement. -5's on my 2.6 arent even laggy really...if you man up and learn how to drive it its perfect....-5's all the way!

[bigmikespec]

There's a place in Sydney that have an R34 with 2.6L, GTSS and 355rwkw. Lots and lots of money spent on the head, but i dont know 100% if the turbos are stock or if they've been modified

Is that on 98?

Add E85, could there be more to be gained?

[N1GTR]

Is that on 98?

Add E85, could there be more to be gained?

SHell 98 to be exact

[NickR33]

Tomei B7660

Between GTRS and GTSS

damn you Slide

how would these compare to the T517z 8cms?

Purely a theoretical question because I'm not planning on changing turbos... anytime soon

back on topic, I would listen to what Ash said about cams... your cams would be setup for making peak power well over 6000rpm... they have massive overlap