What Power To Expect?

[johnbarry88]

Hey guys almost finished with the biuld and im a little scared that the turbo choice wont be what im after. The goal in mind is 450rwhp or 340rwkw and im thinking that the turbo wont be up to the task, with seeing dyno results in the 26 section with gt35r's getting just over 340rwkw. Should I go back to twins? Please let me know what you guys think and how you think it will perform.

MOD LIST:

Engine

N1 24U block (own modifications done) race prepped

Chemically cleaned/crack tested and washed

Torque plate bored honed & decked

All new welsh plugs

Tapped oil gallaries

Fully balanced/detailed crank and grub screwed

Race prepped crank gurdle

Shot peened/prepped standard rods with ARP bolts

Full ARP bottem end stud kit

Ross Racing forged pistons (ceramic coated)

ACL race bearings mains & rods

N1 oil pump (modified)

N1 water pump

Genuine Nissan gasket kit

Fully port & polished head

Match ported intake

Brass valve guids

Standard valves

Upgrade valve springs

Standard cams

Greddy adjustable cam gears

Greddy clear timing cover

Polished intake manifold and valve covers

Gates timing belt

New genuine exhaust studs & nuts

Garrett GT3082r turbo polished front cover

Braided oil lines

.82 & 1.06 housings ceramic coated

Tial 44mm wastage

Ebay spec manifold modified

Greddy twin entry air intake pipe

2 x RB25 Air flow meters

3.5" dump pipe

3.5" catback exhaust

600x300x115mm Greddy style intercooler

Custom PBR clutch

Nismo lightened flywheel

Nistune ECU

Sard fuel pressure regulator

custom fuel rail

044 fuel pump

2L surg tank

3/8" Aluminium fuel lines

Heap of speed flow fittings & push lock hose

Sard 700cc injectors

Alloy dual core radiator

Silicone radiator hoses

Silicone heater hoses

Edited April 29, 2008 by johnbarry88

[R31Nismoid]

Whats the 3082... 500 or 550hp?

I had the GT3040 (i think its been renamed) and that was the biggest version of the GT30 frame (600hp)

I made 270rwkw @ 17psi, and 24psi/370rwkw (factory head, cams etc) but that wasnt PULP... so i couldnt see why the 600hp couldnt come close to 320-330rwkw, although you will be leaning on it with at least 24psi IMO and thats pretty heavy going...

I honestly think you'll need the GT35 to get to 340rwkw or much near it.

[johnbarry88]

gt3082 (aka gt3040) rated 600hp

[Samon]

Greddy clear timing cover

Polished intake manifold and valve covers

Garrett GT3082r turbo polished front cover

Well with those mod's, you should easily be hitting eleventy-million kw!

[johnbarry88]

Well with those mod's, you should easily be hitting eleventy-million kw!

haha funny c*nt just keep the stupid remarks to yourself please..

[WOG BOY]

hahahaha top call ant...love it!

will be good to see it all running and back on the road again!

i will call aorund one time so i can have a look in person...and u can check over those few things on my liner!

Catchya later dude!

Cheers

Matt

[Samon]

haha funny c*nt just keep the stupid remarks to yourself please..

My point was to question why you bothered to put those mods down in the list when the topic was about how much power to expect...

[johnbarry88]

its for the rice factor now back OT please

[WOG BOY]

My point was to question why you bothered to put those mods down in the list when the topic was about how much power to expect...

he has posted the list in a few different places obviously so he just cut and paste it.....

[NYTSKY]

You will get there,just with a bit of boost screwed into it.Will be nice and responsive too.

[R31Nismoid]

OH i didn't see the twins comment.

IMO go back to twin GTSS or -7's.

You'll make 330rwkw like everyone else has been able too, and it'll be as responsive as the stocker setup

Im bias to twins now ive seen so many banger setups and nothing in a single that matches it.

[Lithium]

Standard cams

.82 & 1.06 housings ceramic coated

Hiya, sounds like quite a neat build - though I'm not sure why you'd go to so much effort and stick with the stock cams, I'm not entirely sure if or how much that may conspire against you in going for your power goal. Which turbine housing are you running on it, the .82 or the 1.06??

Also I'm not sure what dyno you will be running on, some of the aggressively low reading dynos over there you may struggle to get that out of a GT3082R though 340kw SHOULD be achieveable on most I'd imagine though no matter what you will be pushing the higher end of what a GT3082R can do. I know someone over here (NZ) running one on his RB25DET R32 GTSt and on slicks he has run 10.1 with a small shot of NOS.

[johnbarry88]

The build has cost me so much $$$ that buying cams now is just not an option (have a mortage to pay off too not easy on apprentice wage) it would be great but impossible rite now, we will be putting cams in later though its the only thing this build does not have. The turbo has the 106 on it now and we'll run with the atm to get peak power out of this setup but if it deems to laggy we will put the 82 back on..

[Lithium]

The build has cost me so much $$$ that buying cams now is just not an option (have a mortage to pay off too not easy on apprentice wage) it would be great but impossible rite now, we will be putting cams in later though its the only thing this build does not have. The turbo has the 106 on it now and we'll run with the atm to get peak power out of this setup but if it deems to laggy we will put the 82 back on..

Well my personal opinion/what I would do in your position would be run with the .82a/r with the stock cams and pour a bunch of boost into it make the most of it being a punchy set up. Regardless of how much power it makes, it will be quite punchy though you probably won't have the full top end monster you could have. I reckon it could be quite a fun car though

If I remember rightly the .82a/r GT30 turbine side has very similar exhaust flow to a .63 GT35R, and runs exactly the same compressor housing and wheel - so I can't see why it'd not do anything a .63a/r GT3582R would do, maybe SLIGHTLY less flow and better response. Its when you start getting into .82a/r and 1.06a/r GT3582Rs where you will start losing out in my opinion, I'm no expert though haha.

If you intend on later on down the track upgrading cams etc, then you'll have a good idea of if the GT30 turbo is going to be sufficient - going GT2860s or GT2530s would probably be a waste when you already have the turbo and don't have the cams to really justify the extra flow up top. Again, only my opinion.

[johnbarry88]

now that you mention it I think that we'll go with the 82 housing, this is suppose to be a street car after all + its in a r33 gtst so im thinking traction will be a problem but nothing toyo tyres cant fix lol.. Plus the twins are harder to work on if needed and the sigle just simplifies things..

[Lithium]

now that you mention it I think that we'll go with the 82 housing, this is suppose to be a street car after all + its in a r33 gtst so im thinking traction will be a problem but nothing toyo tyres cant fix lol.. Plus the twins are harder to work on if needed and the sigle just simplifies things..

I think that'd probably be the way I'd go, especially if you have it in a RWD - I think lack of power isn't going to be your biggest problem For interests sake, if I read it correctly the 1.06a/r GT30 turbine actually flows better than a .82a/r GT35 turbine, and if that is correct and I am not missing something else (which is entirely possible) then using the 1.06a/r you will actually be able to make more power at higher boost than the typical .82a/r GT3582R. Given that the GT design is fairly well suited to bigger a/r housings, and that there is less rotating mass, it makes me wonder if you could end up with a combination almost capable of making similar power AND better response to with a GT35R.

I hope Discopotato03 finds this, and enlightens... or shares an opinion

[Brockas]

I've seen a GT30 run 326rwkw on a built RB25 before.

I think it's the perfect turbo for your power goals. But I can see you chasing more and opting for the 35R or T04Z later down the track...

[SimonR32]

i would be tipping 335rwkw with that turbo with response that would shit all over gt-ss

proper set up high mounts are sooo much better/responsive than low mounts

[R31Nismoid]

Prove it

All posts in the RB26 upgrade thread beg to argue the fact far as ive seen it

[Lithium]

Prove it

All posts in the RB26 upgrade thread beg to argue the fact far as ive seen it

There is only one GT3040R in that thread which I have seen, and it was making ~300kw @ wheels with stock fuel system - the guy never came back (that I am aware of) with a result using the 555cc injectors he promised. Do you know of any others? I know people making well over 300rwkw with GT3076Rs on RB25s, so presumably people would make even more on GT3082Rs.