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Old 07-10-2010, 06:28 PM   #31
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ah yes boost controll is a bit of an issue, with a 1.8 bar spike every now and then and excessive heat, these are the reasons i want to try the .82, it finally arrived yesterday!
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Old 07-10-2010, 07:34 PM   #32
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You don't need balancing unless your revving above 8k rpm.
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Old 25-03-2011, 02:59 PM   #33
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Sorry to ressurect this but I'm also looking at the direct fit GT30 RB fitment turbos.

Interestingly, the specs for these turbos show different exhaust A/R's 0.76 (tweakit) and 0.86. Either there are 2 housings available, or one isn't genuine Garrett housing or someone has duff info. Also tweakit as about 1000AUD cheaper.

The tweakit one as listed earlier;
http://www.tweakit.net/shop/product_...oducts_id=6598

Or Boostnimports
http://www.boostnimports.com/parts.html

Garrett GT3071R Kit forRB20/25

Product Information:

480HP Kit Includes

Garrett GT3071R-20 (700382-5020)
RB Turbine Housing (RB25-GT28)
Hi-Flow of Turbine Housing
RB Water/ Oil Kit
Silicon Reducer
Dump Stud Kit
Silicon Joiner
Hose Clamps
Spacer Plate
Gasket Kit
T/E Clamp Kit
Actuator 16psi
Actuator Bracket and Rod
RB Intake Pipe and Outlet Hose Kit


Price: $2638.00 inc GST

He's since sent me further info as follows;
See below for the full specs on this turbo:

GT3071R Ball Bearing Internal Wastegate
(Product Code: 700382-5020)
Description:
Part Number: 700382-5020
Model Number: GT3071R
Approximate Horsepower Range for Engine Capacity: 300-480Hp (1.8L-3.0L)
CHRA(core): 700177-5004
Compressor Housing: 467987-0015
Compressor Housing Air Ratio: 0.50
Compressor Wheel Inducer Size (mm): 53.14
Compressor Wheel Trim: 56
Turbine Wheel Exducer Size (mm): 53.6
Turbine wheel Trim: 90
Turbine Housing & Air Ratio Size: 0.86
Turbine Housing Inlet port: Single
Integral Wastegate: YES
Actuator Pressure (psi/kpa): N/A
Water Cooled Centre Housing: YES
Ball Bearing : YES


These are from what I can gather as Garretts answer to HKS for the GT2835 Pro S turbos. I think the BHP figures of 480-500bhp are way optimistic but then I'm only looking for a nice strong 400-430bhp anyway at relatively sensible <1.5bar boost.

My spec is stage 1, I intend to fit the turbo at 0.85-1.0 bar to start, then change injectors and ecu (Nismo 555cc and Link G4).

Any thoughts or comments on these turbos?
Does anyone here actually own one.

Thanks
Nito

Last edited by NITO; 25-03-2011 at 03:01 PM.
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Old 25-03-2011, 03:37 PM   #34
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for 400-430bhp I'd probably rather go hybrid, a lot cheaper although the GT3071R will give scope for more power I.e 450-470bhp and still very good spool.
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Quote:
Originally Posted by anthonymcgrath View Post
I'd definitely chase response as opposed to out n out power - even a jump from 300-340bhp to 400bhp is a serious fright - going to 450-500 is mental ...unless your Bruce there... then power is like pringles... enough is never enough ;)
...mmmm... pringles....
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Old 25-03-2011, 04:52 PM   #35
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Hi Bruce,

The dearer of the two above equates to around 1500 and the tweakit one about 1k. I've always been a big fan of HKS/Garrett turbos and as you say this gives scope once the HG is done to increase the power.

I don' think the response on my stock turbo is all that good, with a 3" full system and HKS actuator at 0.85bar it doesn't really kick hard until about 5k. It has an RSP stage 1ecu flash (nothing is written on the ECU but it revs to 7.5k on the clock). I'm hoping this would give better spool, broader power band and better top end.

Just had an email back from boostnimports, their one I'm being told is 5 bolt, so trying to get to the bottom if it, if its 5 bolt it won't fit unless it has an extension elbow! The tweakit turbo shows a photo of a six bolt.

Horsepower in a box also list the RB direct fit GT3071R.
http://www.horsepowerinabox.com/HPIAB2/category12_2.htm

No spec listed on those yet though...

Do the hybrids suffer from the wastegate being too small, I seem to remember reading this somewhere or is that all sorted?

Cheers
Nito

Last edited by NITO; 25-03-2011 at 05:06 PM.
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Old 25-03-2011, 05:17 PM   #36
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Quote:
Originally Posted by NITO View Post
Hi Bruce,

The dearer of the two above equates to around 1500 and the tweakit one about 1k. I've always been a big fan of HKS/Garrett turbos and as you say this gives scope once the HG is done to increase the power.

I don' think the response on my stock turbo is all that good, with a 3" full system and HKS actuator at 0.85bar it doesn't really kick hard until about 5k. It has an RSP stage 1ecu flash (nothing is written on the ECU but it revs to 7.5k on the clock). I'm hoping this would give better spool, broader power band and better top end.

Just had an email back from boostnimports, their one I'm being told is 5 bolt, so trying to get to the bottom if it, if its 5 bolt it won't fit unless it has an extension elbow! The tweakit turbo shows a photo of a six bolt.

Horsepower in a box also list the RB direct fit GT3071R.
http://www.horsepowerinabox.com/HPIAB2/category12_2.htm

No spec listed on those yet though...

Do the hybrids suffer from the wastegate being too small, I seem to remember reading this somewhere or is that all sorted?

Cheers
Nito
The main problem with hybrids is the turbine just struggling to flow the gasses hence why they struggle to hold boost, the GT3071R is th ebetter option if you want more in the future.
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Quote:
Originally Posted by anthonymcgrath View Post
I'd definitely chase response as opposed to out n out power - even a jump from 300-340bhp to 400bhp is a serious fright - going to 450-500 is mental ...unless your Bruce there... then power is like pringles... enough is never enough ;)
...mmmm... pringles....
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Old 25-03-2011, 10:38 PM   #37
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make sure you get a genuine garrett turbine and the uncropped 60 mm majour diameter turbine, the .68 housing will boost spike and the .82 isnt appreciably laggier with better top end, fitting a gt30 71 r to an r33 rb25det isnt going to be a straight swap, custom ex down pipe and inlet and also custom oil and water lines but a real nice road turbo in the end
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Old 26-03-2011, 08:19 PM   #38
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Just had confirmation back from boostnimports that it is indeed a six bolt housing, he's checked with Garrett, its a 0.86 exhaust housing and the rest of the spec is as per the GT3071R not sure on turbine wheel size, compressor inducer is 53mm no idea on exducer but should be able to get it off garrett website.

Cheers
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Old 26-03-2011, 09:57 PM   #39
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when i was checking around last year rsp offered the best price package for the gt3071, genuine garrett ex housing and optimum trim with downpipe adapter
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Old 27-03-2011, 12:38 AM   #40
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GT3076R dual ball bearing turbo info...

tweakit rate the turbo at 550bhp...
http://www.tweakit.net/shop/product_...oducts_id=1023

these guys at realstreetperformance rate the garrett tub at 630bhp... (where I got my turbo btw..)
http://realstreetperformance.com/sto...urbo-2004.html

1st point is - big difference in power claims - then it goes the other way as Bruce points out where it'll only make 500bhp at 1.6bar (only lol!). But then i've spoke to a couple of tuners and they say it'll happily approach 550-600 depending on other mods and how fuel is pushed etc.

2nd point is - its a bit hard to pinpoint exactly what you'll get really - each car is different but I would say supporting mods will really help out the car along with the turbo so ensure you chase those things up really.

I chose this turbo (build thread in my signature btw) - and i'm putting mods in to provide response. Things like the gtr style greddy plenum and bigger throttle body along with injectors etc. My engine is forged internals so it should hold the power well and I replaced the head gasket and while the head was off got it refreshed (needed two new inlet valves too!) Its only running a basemap at present but already its surprised a couple of ppl with how well it picks up and approaches the boost threshhold.

I'd definitely chase response as opposed to out n out power - even a jump from 300-340bhp to 400bhp is a serious fright - going to 450-500 is mental ...unless your Bruce there... then power is like pringles... enough is never enough ;)

good luck - be interesting to see what you go for - I'd personally chase an RSP hybrid tub, supporting mods n remap then see how you enjoy that. Scared the crap out of me... The only reason for my tub build is mainly cos my engine top end needed sorting and I always wanted to do a tub swap which initially I was gonna keep very simple with standard manifold etc but hilariously bought the non-wastegate tub so decided sod it I'll go through the full build process.

...mmmm... pringles....
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Old 27-03-2011, 01:41 PM   #41
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there is no way in a million years the 3076r will approach even 550hp. unless you have magic rollers.

remember US hp is different to ours.

a bolt on 3076r in internal wastegate type will not make 500hp. it has the small turbine in comparison to the non WG version.

its about time more people were realistic with hp claims.
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Old 27-03-2011, 01:59 PM   #42
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Didn't know us bhp figures were different to ours. If mine makes 500 I'll be more than happy but I'd rather it made 450, be safe and slam me in th seat to th redline really!

Martin I'll give you a call in a bit when I've finished my house chores!
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Old 27-03-2011, 02:33 PM   #43
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Quote:
Originally Posted by [email protected] View Post
there is no way in a million years the 3076r will approach even 550hp. Unless you have magic rollers.

Remember us hp is different to ours.

A bolt on 3076r in internal wastegate type will not make 500hp. It has the small turbine in comparison to the non wg version.

Its about time more people were realistic with hp claims.
agreed
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Old 27-03-2011, 02:45 PM   #44
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so what difference in terms of bhp and performance/response will:

a. the different housings make? ie: .62 .82 1.02 (I think those are the numbers)

b. the internal wastegate vs external wastegate?
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Old 27-03-2011, 03:40 PM   #45
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We have fitted a few GT3076 turbos and have seen lots of different results but on avarage a External wastegated version with a .82 exhaust housing is good for 500bhp although on a good engine we have seen 520bhp (flywheel) the internaly wastegated versions we have done are good for 460-480 but the boost will not be as stable as a external wastgated version. We run them upto 1.5b but the boost will not hold with the .82 housing.

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