Garrett Gtx3071R

[Angeltownracing]

A forced performance gt3076r would be a very interesting option. There are a good review on the end of the page.

http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=PROD&Store_Code=FP&Product_Code=NTGT3076HTA&Category_Code=Turbo-FP

I have built a few evo's with FP green HTA turbo's. They spools amazing early (1.5bar about 3600rpm) and the flow enough to get out 500hp (on the engine) with a serious built engine.

What do you think about a GTX3076R A/R 86. Perrin performace has done a very expressive comparing test. They has compared the GT3076r AR/86 with GTX3076r and GTX3582r, each with AR 0.63 and AR 0,82 turbine housing. The GTX3076r ar 0.86 spools equal early to a gt3076r, but it has much more flow in the top.

I think the GTX3071r ar 1.06 from mick will be very similary to ah GTX 3076r AR 0.86.

[Angeltownracing]

Here is the perrin turbo test. They made it very professionaly! Verry interessting!

http://blog.perrinperformance.com/garrett-gtx-turbo-comparo-part-2/

[Angeltownracing]

And here the first part.

http://blog.perrinperformance.com/garrett-gtx-turbo-comparo/

[AngryRB]

that GTX3582 looks like a monster, full boost on 4000rpm

Does this mean the GTX3071 is a bit laggy or does this subaru make boost better than an rb?

[Mick_o]

I doubt an EJ would build boost quicker than an RB cos of the length of the headers. I didnt read it properly but were they testing internal gated turbos?

that GTX3582 looks like a monster, full boost on 4000rpm

Does this mean the GTX3071 is a bit laggy or does this subaru make boost better than an rb?

[AngryRB]

I doubt an EJ would build boost quicker than an RB cos of the length of the headers. I didnt read it properly but were they testing internal gated turbos?

looks like its internal gated comparisons, makes the GTX turbos look better than the gt turbos even though its 58trim vs 56trim and bigger , the gtx35 in 0.63 looks the goods to me, approaching 500hp with only 500rpm lag over gtx3076,

[AngryRB]

My dump pipe to suit the garrett housing">

im just curious , is the return pipe here being returned to a optimum angle, just wondering if the gas returning would be crossing the main flow of the dump and be restricting the flow, happy to be corrected cause im just curious what angle is the best, i thougth it would be better on a steeper angle toward the general flow of the main pipe

[Mick_o]

Probably hard to tell from that pic but the wastegate line comes in at bout 45 degrees which i dont think is too bad but it still seems to flow alright and makes good power so im a happy man haha

im just curious , is the return pipe here being returned to a optimum angle, just wondering if the gas returning would be crossing the main flow of the dump and be restricting the flow, happy to be corrected cause im just curious what angle is the best, i thougth it would be better on a steeper angle toward the general flow of the main pipe

[SargeRX8]

If it concerns you to much, cut it, shut it and let nature take care of it lol.

[badhairdave]

I'm a little excited to have caught wind that ForcedPerformance are bringing out a GT3073HTA turbo - that could really mix things up something nicely

As far as I can tell, its basically going to be the same housings as the current Garrett 56trim GT3076R/GTX3071R/GTX3076R range but with the same 73HTA compressor wheel as the FP Green HTAs which were proven to make near 450whp on pump gas EVOs, or over 500whp on E85.

Forced Performance rate the comp wheel at around 55lb/min, so in a similar range to the GTX3071R and GT3076R but with an overall smaller/lighter compressor wheel... it should be a seriously responsive beast and in my eyes could be basically the perfect match match for a GT30 turbine that never existed.

I wish these things existed when I was shopping for a bolt on turbo back in the day, have seen no results but its an experiment I would most definitely do if I hadn't already.

Aren't they already offering an HTA 3071 as well?

I haven't seen any garret HTA results but the mitsu based results are impressive and i agree that the 73mm HTA wheel would go well with the gt30 turbine.

[Lithium]

Yeah they are offering a 3071HTA rebuild at least, I haven't seen it in the normal advertised complete units though. The options of rebuilding an existing unit to GT2868HTA, GT3071HTA, GT3073HTA, GT3076HTA etc have existed for a while but its a bit nicer to have the GT3073HTA as a straight out choice from new.

I have in my head that the balance of flow vs spool etc would be fairly optimal with the GT3073HTA - the GT3071HTA would probably be an awesome choice if you were just going stock manifolds etc though.

[discopotato03]

Those above Perrin links are a good read . That fella clearly shows how turbine side flow has a big bearing on how the turbo and the engine turbo combination works . Slightly OT but I am curious to know if the Garrett Evo 10 twin scroll twin gate GT30 turbine housing would have worked better on a flat four with their screwy firing order and generally single scroll header layout . Garrett do from memory 0.73 and 0.94 AR versions of that TS turbine housing .

Anyway he is at least looking for a reasonable spread of power even if its peaky on the graphs and the peak at ~ 4500 revs has to be better than one around 6000 .

I'm also pleased that he takes some effort to show that these GTX compressor wheels work better at higher pressure ratios (boost pressures) and thats well and good if you want to run high pressures and your engine can stand up to the higher power loads - without bending rods or killing big end bearings . Generally speaking it looks like in your typical 1-1.2 bar (15-18 lb)range the gains are minimul though the compressor OD changes are significant . They should really be calling them GTX 3073R/3078R/3585R and while it won't happen it would have been interesting to see what the wheel performances were had the ODs been the same . I think broadly speaking they are working on the big trim GT turbines being able to support higher power outputs and finding ways of achieving it without using big compressor OD differences .

Those side compressor pics show differences that may not seem big at first glance . Take another look at where the jamb nut is and compare the hub diameter of the GT and GTX wheels size for size . The hub diameter of the GTX wheel is a fair bit smaller and where their isn't hub pork theres blade available to churn air . This was pointed out to me a while back by Mark of GT Pumps when comparing FP HTA wheels to Mitsubishi TD05 ones .

Anyway the older Garrett GT wheels in the small frame GT BB turbos are lifted from the GT diesel turbo range and given a small bore hole to suit the smaller BB GT turbines shaft . Those GT wheels were intended to be threaded bore wheels and they have a hexagon cast into them so they can be tightened onto the diesel turbos bigger shaft . You can see the remains of this hexagon where its been mostly machined away so that they fit on the shorter smaller diameter BB turbine shaft leaving room for a seperate nut .

At the moment my interest in these Garrett turbos is with the smaller GT28 turbine based versions because they have the potential to suit small 1600-2L ish engines or in twin form on guess what . I did some reading recently on the GTX2863R and 2867R versions and the maps look like they have potential . Slowly more info is getting out about the GTX2860R and I wouldn't be surprised if it gets down into the 54-56mm OD compressor turbos with the GT20/22/25 turbine sizes .

It seems the future is small engines that rev and can take higher boost pressures to make acceptable torque , high pressure diesels are here now .

Anyway compared to years ago we are getting better compressors and a reasonable range of IW turbos , still room for improvement with turbines and hopefully more TS TIW turbine housings to broaden the boost range across the engines usefull rev range . It remains to be seen if variable area turbine nozzle housings will get popular or just the manufacturing "ease" of casting TS housings be the economic answer

Interesting times , A .

[rob82]

Those above Perrin links are a good read . That fella clearly shows how turbine side flow has a big bearing on how the turbo and the engine turbo combination works . Slightly OT but I am curious to know if the Garrett Evo 10 twin scroll twin gate GT30 turbine housing would have worked better on a flat four with their screwy firing order and generally single scroll header layout . Garrett do from memory 0.73 and 0.94 AR versions of that TS turbine housing .

Interesting times , A .

That was my thinking too - I would love so see an rb26 with a ts .94ar gtx3076r. Would be a hell of a setup if your chasing around 400rwkw with minimal lag. Factor in variable cam timing e85 I would think you would see peak torque by 3500 with power all the way to 8000 maybe reach 450rwkw.

[Dajae]

That was my thinking too - I would love so see an rb26 with a ts .94ar gtx3076r. Would be a hell of a setup if your chasing around 400rwkw with minimal lag. Factor in variable cam timing e85 I would think you would see peak torque by 3500 with power all the way to 8000 maybe reach 450rwkw.

Exactly my thinking. On paper atleast, the gtx3076 has potential to do 400wkw. Wouldnt the 1.06a/r in TS be enough to keep temps down, and still be suitable for minimal lag? Perhaps it will suffer slightly on a standard capacity 2.6, but a 2.8 or bigger....

[Lithium]

No way on earth I'd put one on a well modded RB26+, not at all convinced by them - there are plenty of better proven options.

[discopotato03]

It would be an interesting experiment if someone had the cash to blow but most people want higher power numbers for the dollar outlay . Most people don't buy GTRs to have good smooth timely power delivery thats accessable most of the time . There seems to be this can't have less than 350-400Kw in a cult car - no matter how Camry like it is at urban speeds .

Personally I think if someone came up with a turbo that turned an RB26 into a broad ranging torque monster it would make a lot of owners happy in their street GTRs . Its not to say that a twin scroll twin integral gate GT/GTX30"76"R is the best one for the job but with the right compressor housing it may well be a good sane upgrade compared to the factory standard twins .

The bottom line is its not easy to persuade 2568 low CR ccs to haul 1500 odd kgs around in style . They need boost to make torque because the engines capacity is not enough to do it well on its own . In this day and age you'd think Nissan would use better chamber and piston crown designs so they could increase the compression ratio and gain better part throttle torque . They'd also use infinitely variable cam timing both sides to increase the cylinders trapping efficiency at low revs .

The hardest message to get across to people I reckon is that Nissan did not have any intention of making the RB26 a good all round road car engine . It was an engine they used to homologate GTRs for production based circuit racing and the capacity was based on a class weight limit formula . Plainly its not hard to make a lot of power from an engine of limited capacity but to do it from the sorts of revs road cars typically use it takes all the "smarts" - and RB26s don't have a lot of them . Its an engine that makes power at revs and its unreasonable to expect any even reasonably conventional turbocharger to change that . Smaller ones will boost earlier than larger ones but they start to limit the top end then .

Nothing is cheap with a GTR I think because they stuffed a lot of stuff into a car with limited space they are very time consuming cars to work on . Lots of things could have made them better and none of them is cheap or easy . Things like VCT/more capacity/shorter diffs/different turbos - all big bucks .

Anyway on topic a single TS turbocharger with some kind of integral wastegating would be simpler than the factory twins and possibly work over a wider range . Still not a complete fix for an engine that wants to haul between 3500-7500+ but you can't have everything .

A .

[Angeltownracing]

that GTX3582 looks like a monster, full boost on 4000rpm

Does this mean the GTX3071 is a bit laggy or does this subaru make boost better than an rb?

I wonder where you've seen that.

The GTX3582 AR63 isn't a good choise. It produce exact the same power as a GTX3076r but, came on 500rpm later! A GTX3582 Ar 0.63 doesn't make sense because the turbine housing is the limited factor! And with a Ar 0,82 it is very much to laggy. I say that with experience, because i've had a gt3582 Ar0.82 on my Gts-t with a external screemer pipe :-) ther's nothing to 5k rpm and than "bangggg!!" funny but not very useful.

Is there nobody who ha experience with a gzx3076r on rb25det?

[w34ponGT]

has anyone done a twin setup gtx 3071r on an rb26/rb28?

[wolverine]

I believe there is a VQ powered barge going for twin GTX3071's

[GTScotT]

Has anyone seen the GT3076 eflex results in the dyno thread yet?

Interesting to see and compare. A trusted tuner I should add.