Gt3071r Internal Wastegate

[tridentt150v]

I am in the market for a new turbo for my RB25 ERC33, I had reason to ring GCG and while talking to their Sales Manager, Mark Landell, he mentioned that they can provide me with the internal wastegate Garrett GT3071R with a custom T3 turbine set up [they come out with a T28 std]. He reckoned this set up is a easy install bolt on equivalent of the HKS 2835proS.

Now I’m not knocking GCG, they have an enviable reputation and I've only got good things to say about they myself, and Mark is very likely a good man and knows his stuff. But he was a bit reserved when it came to talking up this turbo’s performance and likely power output. He reckoned 250rwkw was a good starting point and that maybe a bit more. This sort of threw me because the HKS 2835proS has figures quoted more like 300rwkw. And I’m already making 240rwkw with the turbo I’ve got, so I really want to upgrade, not move sideways.

I just wanted to see what everyone thought? I know discopotato has written some stuff on the 3071 external wastegate and is keen on an internal version, but is what GCG offering just such an animal, or is it something else/less.

The turbo GCG are selling has a 0.50 compressor cover, a 56 compressor wheel trim, and an 84 exhaust wheel trim and is rated at 450hp, but because it is new on the market, they really had no installed real time power output figure.

[sinistaGTR]

why dont you just go a gt3040 or a gt3540

Edited October 7, 2006 by sinistagtst

[R31Nismoid]

a 450hp wont throw you to 300rwkw.

[tridentt150v]

a 450hp wont throw you to 300rwkw.

Thats what I thought, but its like they are saying no it won't/yes it will. On one hand they put out a 450hp figure, and on the other they say it is the direct equivalent of the 2835proS? Ambivalent messages methinks!!!

[Tangles]

perhaps ring Adelaide Turbo Services and ask about their highflowed GT30 turbo..... rated to 500hp so its the next stage up from the GCG highflow. worth a call, IMO.

[R31Nismoid]

putting the larger comp wheen into the stock turbo is a bad idea

GCG did this in thier "stage 2" hi-flow and ended up stopping it because of the surge issues etc.

You'll have to step up a frame to the GT30 series with the GT40 wheels if you want more than the GCG provides.

[al_r33]

Talk to Slide off this site! I just bought a GT30r off him

here are the specs

Specs:

Turbine:

-84 trim 60mm GT30,

Compressor:

-76.2mm 56T compressor

Compressor housing:

4'' inlet

500hp rated

Dual Ball bearing core

Internally Gated

Exhaust housings:

T3 inlet GT30 outlet 0.82

& also GCG offer the same thing except they rate this turbo @ 600hp! Anyone know why?

[wolverine]

trident, if you are unsure whether it will outperform a HKS 2835 pro s (remembering that both the GT3071 & HKS 2835 pro s use a 71mm compressor) and then the only way to be sure would be to go the 76mm compressor.

if GCG are talking about the GT3071WG disco is going to try to talk you out of it as it has the cropped turbine, if it is new then it may be one of the new internally gated garrett housings.

ask about GT3076 that should give you a little more headroom or splash out on a HKS3037 (the HKS version of the 3076)

check atpturbo.com as they can supply a genuine GT30 internally gated turbine housing that you can mate to whatever combo takes your fancy.

Edited October 7, 2006 by wolverine

[tridentt150v]

Yes, I've looked at the Gt3076, I reckon it would be a better bet. If I got it with a T3 and a good exhaust turbine combo it would be close as.

If you read the first post, I state that the GT3071R is an internal. I really don't want to go to external, I believe that I can get everything I want out of a good internal wastegate.

And just to set the record straight don't want 300rwkw, but I want my turbo to be capable of it if I ever do want to. I am really only looking at around 270-280, the motor is untouched except for cams.

[wolverine]

trident i read your first post and understand you want a internal gate. if you go thru the garrett catalogue they offered a GT3071WG with a cropped 56mm turbine, it is an internally gated turbo.

however it doesn't use a genuine GT30 turbine housing.

hopefully the one GCG are quoting is one of the new 'genuine' GT30 housings with 60mm turbine (not 56mm) and internal gate.

if it isn't you could order one from ATP and buy the rest locally.

[tridentt150v]

No, they are offering a GT3071R with a custom turbine ie they replace the T28 with a T3, it is internally wastegated. It is a very new offering and not listed on their catalogue, I asked why I couldn't see it on their site as well and that was the reply. But overall I think it will be too small for me anyway, so have gone off the idea. going to have a yarn to Slide first and see what he can do..........[its only money, haven't touched 2009's wages yet..lol]

[R31Nismoid]

T28 & T3 are just the flange/housing types

Not a wheel types.

Whats the turbine end spec?

[tridentt150v]

I don't know, GCG didn't say what they were using, and Friday 5.00 came too soon. I can ask on Monday. All I was told is 84 exhaust wheel.

[wolverine]

http://www.atpturbo.com/

currently on the front page is the listing for the new GT30 and GT35 housings.

[discopotato03]

Yes I'd want to know the turbine dimensions not just its trim .

Just on the "cropped" GT30 turbine in the 2835 and 3071R-WG , its the GT28 exhaust housings that turn it all to shite not the turbine . The 2835 Pro S turbos use that turbine as well and they are not too bad but remember they use a GT30 based exhaust housing .

Before Garrett released their new GT30 and GT35 IW housings I was told GCG had been using some other T3 flanged IW housing but I not sure what type .

If it were me I'd be insisting on the real GT3071R with the full sized GT30 60mm 84 trim turbine . Garret now makes a propper GT30 IW T3 flanged exhaust housing and I would use nothing less on any GT30 turbine based turbo . Have a look at ATP's site at the REAL GT3071R , they don't mention "real" but its the one without the "WG" tacked on the end of it . The site shows a selection of exhaust housings so they can obviously sell it with the good IW GT30 housing .

Cheers A .

[al_r33]

So how does that gt30r compare to a gt3071r?

Specs:

Turbine:

-84 trim 60mm GT30,

Compressor:

-76.2mm 56T compressor

Compressor housing:

4'' inlet

Exhaust housings:

T3 inlet GT30 outlet 0.82

500hp rated

Dual Ball bearing core

Internally Gated

Edited October 7, 2006 by al_r33

[tridentt150v]

The 30R is bigger.

3071 450hp

3076/30R 500

3040 600

Or so I'm told!

Al_R33, what piping are you using, for dump and intake?

[discopotato03]

Going off Garretts current numbering system a GT3071R is a GT30 turbine with a 71mm Major OD compressor . The GT3076R is same deal with a 76mm compressor instead . So 30 + 71m or 30 + 76mm - 3071 or 3076 .

Personal opinion but the GT30 turbine is struggling with the 56 trim 76mm wheel so response is compromised slightly . The 52 trim 76mm wheel works well but is only marketed by HKS I believe , called GT3037 52T .

The GT3071R is supposed to be a production version of Garretts competition only TR30R using their off (their) shelf wheels . In theory its good for 440 Hp but at high boost pressures .

By response I mean boost threshold as well as the transient response of the turbos rotating group .

Out of time cheers A .

[drag-on silvia]

is this the turbo that your refering too?? or similar. i have just purchased one with the .63 nissan housing on it but am yet to have it bolted up to see how it goes. it should be alright however for the moment im a lil sceptical about the 500hp rating on the turbo and obviously not gonna make that power on the .63 housing. having said that the reason i went for this turbo was that it was easy enough later off down the track to bolt on a .82 ex gate gt30 housing (funds wernt permitting when i purchased this turbo to eg gate setup.) and try for bigger power.

http://www.horsepowerinabox.com/HPIAB2/prod18.htm

this is the link for the same turbo on atp turbo

http://www.atpturbo.com/Merchant2/merchant...tegory_Code=GRT

this is the turbo i have, its identical same antisurge comp cover and all, just the .63 nissan housing.

Edited October 8, 2006 by drag-on silvia

[al_r33]

tridentt150v,

"Al_R33, what piping are you using, for dump and intake?"

I have left that decision with the mechanic but its all going to be custom made. Will let you know when its complete