Garrett Gt3071

[GTST-25]

hey guys i have done quite a bit of research... especially reading past threads..

i thought i would quickly check with yall first...

i have a 33 with ems cooler exhaust new turbo manifold etc..

and want to upgrade my turbo... i have decided on a Garrett gt3071 with .63 exhaust and with an internal wastegate....

does this all sound like a good setup ?

Cheers thanks for any feedback

[Cubes]

You haven't done enough research then. Check out discopotato's posts.

The GT30R (GT3076R) is a much better choice.

[Downforce]

The Garret GT3071R does not come in a T3 flange with internal wastegate ... therefore if you want the 3071R for your RB25 (T3 flange), then you would need to use an external wastegate.

[discopotato03]

A GT3071R , (real one has 84T 60mm GT30 turbine + 56T 71mm GT35 Comp = CHRA No 700177-23) would not be the most responsive thing on an RB20 . Works better on 2L four ie 4 ~ 500 cc pots .

The HKS GT2835 Pro S in .68 a/r turbine housing would be a little better with its smaller 52 trim compressor but the kit is not cheap .

All in all I reckon a std (ceramic BB) turbo Hi flowed like GCG's or a model specific HKS GT2530 sounds good for the road . You can go bigger but its getting not nice for a street car at typical street car revs .

Cheers A .

[BOZ22N]

Hay guys I have a GT3071R with a 0.63 turbine hsg on it. I have not installed it yet due to Christmas and New Year but will be hopefully on in about 2-3 months so if you can wait till them I will pm you with how it goes.

I have pm'ed discopotato03 about this turbo set up before and he mentioned that is was very similar to the GT2835. Please correct me if I am wrong?

A few people I have talked to that had them on there RB20s made 240rwkw and had full boost by 4000rpm so on a RB25 it will hopefully be around 3500rpm with a good tune.

Cheers,

Boz

A GT3071R , (real one has 84T 60mm GT30 turbine + 56T 71mm GT35 Comp = CHRA No 700177-23) would not be the most responsive thing on an RB20 . Works better on 2L four ie 4 ~ 500 cc pots .

The HKS GT2835 Pro S in .68 a/r turbine housing would be a little better with its smaller 52 trim compressor but the kit is not cheap .

All in all I reckon a std (ceramic BB) turbo Hi flowed like GCG's or a model specific HKS GT2530 sounds good for the road . You can go bigger but its getting not nice for a street car at typical street car revs .

Cheers  A .

<{POST_SNAPBACK}>

[discopotato03]

Similar to a 2835 in that it has the same series of turbine and compressor wheels .

ALL of the GT2835 HKS's and GT3071R's are GT30 turbine based turbos , ALL of them use 71mm GT35 (BCI-18 series) compressors . The turbine is cropped in all of them except the propper GT3071R cartridge 700177-0023 .

Most of the HKS GT2835 series use the 52 Trim compressor though I have a table of HKS turbos that shows a 48 Trim compressor version rated at 380ps . 52T rated at 400ps , the 56T 410ps and the 56T Pro S at 420ps .

Garrett has a bad habit of only offering the largest trim compressor version in the turbos they market .

CHRA's

700177-0002 Cropped Turbine 84T + 52T comp

700177-0003 Cropped Turbine 84T + 56T comp

700177-0004 Cropped Turbine 90T + 56T comp

700177-0023 Uncut !!! Turbine 84T + 56T comp

I suspect the 48 trim compressor version is 700177-0001 but unconfirmed .

The middle two of the list above are what Garrett is fobbing off as "GT3071R WG or wastegated " . You are getting ripped off big time if you buy them or any of the HKS GT2835 series with the T28 flanged GT28 integral gate exhaust housings as the combination of GT28 housing and GT30 based turbine is a flop .

Also to save confusion , you will notice the first three have a cropped version of the GT30 UHP (Ultra High Pressure Ratio) turbine . Its major diameter is 56.6mm where the uncut version is 59.9mm . So the 84 and 90 trim versions of the first three are based on a smaller diameter than the last which is an 84 trim 59.9mm .

HKS/Garrett turbo unit numbers for the above cartridges or CHRA's

700177-0002 = 700382-0002 , 700382-0006 , 700382-0018

700177-0003 = 700382-0003 , 700382-0007 , 700382-0019 , 700382-0024

700177-0004 = 700382-0004 , 700382-0020 , 700382-0021

Turbo unit numbers vary because of differences in turbine and compressor housing style and a/r .

The last one (-23) is only sold by Garrett as a cartridge that you can select a number of housing options for . ATP Turbo (US) sell them as a unit with .63/.82/1.06 a/r GT30 turbine housings + .50 a/r TO4E compressor covers .

Cheers A .

[GTST-25]

thanks guys for the info... sorry i dont know enough about turbo specs yet... so its true no garrett gt30s come internal wastegated ?? is it possible to put one on with out using my standard housing ??

Cheers

[wolverine]

from a poster here (Fantasy Performance).....

"The exhaust housing's I am offering have a T03 foot print and are cast by Precision Turbo's in the US. They use a Ford style T03 internal wastegate set up but are a proper GT housings"

i believe the housing was coming from a Qld Turbo supplier.

perhaps there is an option internally gated with the 60mm turbine.

ps. don't panic if you don't understand the above info. i have been getting my head around this info over a period of time, with a lot of patient help from disco. there are lots of threads that relate to the 'real' GT3071R' if you do a search you will find them pretty easily.

Edited January 2, 2006 by wolverine

[Cubes]

I'm grabbing Corky Bell's Maximum Boost book and going to have a good solid read.

Its too hard to learn what you need to learn via google.

Just when you think you understand whats going on you realise your back at step one.

[Col-GTSX]

I'm grabbing Corky Bell's Maximum Boost book and going to have a good solid read.

Its too hard to learn what you need to learn via google.

Just when you think you understand whats going on you realise your back at step one.

<{POST_SNAPBACK}>

I totally agree...

Step 1 is the hardest part...

I have to say tho choosing a turbo is alot like making a sandwich. I mean first there is the filling (size of compessor and turbine) then you got the sauce (housing sizes) salt & pepper (flange type) then the type of bread (brand of turbo)....

I get so confused some times that i reckon ill stick to sandwich's cause they make me happy too.

But seriouslly i have been tossing up inbetween keeping the high flow i already got or a GT30 style Garret unit (probablly a .82 rear housing and a .7 front housing with an external wastegate setup) But yeah changing all the exhaust manifolds makes me also check out the GT turbines from HKS as their bolt on....

I guess for the cost tho you could get a full garrett setup for the same price as a HKS turbo....

[GTST-25]

i first looked at the HKS 2530 .. i guy i know has one for 1500 secondhand in great condition.... i have been told these are slightly small for a rb25 ?? im sure it will be a big improvement on the standard ?

[The Mafia]

2530 are very responsive, and will get about 230rwkw, but not much of an upgrade

[somer32]

i have an rb20 and put a gt-rs turbo on (400ps) internal wastegate.

full boost at 3500rpm with standard computer, mainifolds and blowoff valve.

great up grade but costly

around $3,500

what sort of hp you after.

mainly for street or drag racing.

hope this helps

[Cubes]

The HKS2530 on the RB25 isn't much of an upgrade with regards to peak power but mid range power is simply awesome.

[The Mafia]

hey cubes, another bastard thread like mine hey? hehe

mate, you might want to have a loo kat my thread, towards the end, there is all of this talk about me and my turbo (GT30)..

worth reading. Hope it doesn't scare you too much lol.

http://www.skylinesaustralia.com/forums/in...showtopic=89613

[Cubes]

lol.

I'm never going to get a decent turbo on mine at this rate.

[wolverine]

group buy when we all get RB30's underneath then....

[GTST-25]

i would be happy with 230 -240 wrkw

230 out of a hks 2530 sounds good .. and its all direct bolt on !

but for a little bit more money i could but a garrett brand new !!

[wolverine]

GCG hiflow of your standard turbo will get the job done the cheapest way and achieve your goal....

[The Mafia]

thats exactly right - GCG highflow is the most cheapest upgrade ($2k) and it bolts straight back on, no adjustment to oil or water lines.

2530, you'll be spending $300 on oil and water lines, and lots of time and stuffing around... I've been there and done that, pain in the ass.

If I could do it again, I'd get a high flow. But, I can't do it again..