Garrett Gtx3071R

[34GeeTeeTee]

I feel the GTX3071 was the pick of the GT30's, now I have upgraded to the GTX3076 I feel the turbine just doesn't have the energy to spin up the oversized compressor. I'm betting the GTX3576 would be the better option.

I am also interested to see the results from the GTX3067, but I doubt it will see much over 300wkw without a gut-full of boost and ethanol.

I am at a point where i have the opportunity to swap turbos if needed as the car requires a full retune for the new injectors etc (long story), i HAD a nice 3082 to trial up until a few days ago when i sold it (talk about timing).... So i will be doing plenty of research too see if the GT3037 i have is the best choice of if there is an option for a better turbo for my setup, currently making good power on the old GT series but will read up on these GTX etc just incase... Is the GTX3576 likely too be laggy (Assume like a GT3582)?

[Lithium]

I feel the GTX3071 was the pick of the GT30's, now I have upgraded to the GTX3076 I feel the turbine just doesn't have the energy to spin up the oversized compressor. I'm betting the GTX3576 would be the better option.

I am also interested to see the results from the GTX3067, but I doubt it will see much over 300wkw without a gut-full of boost and ethanol.

I remember yonks ago calling my doubts of the GTX3076R's worth. Has anyone driven an equivalent GTX3071R and GT3076R? How much difference is there between the two? It was really the one I had the highest hopes for, and that hasn't changed.

The GTX3067R is a very interesting unit too... could go either way, I'd say it's real worth will be for those running stock engines and exhaust manifolds - in those situations it'll probably be a totally gun choice. Anything more ambitious and I'd say it'll be time to go bigger, even if slightly.

[discopotato03]

I personally think you have to be looking for big power at the expense of usable power to even consider a GTX3076R . I think Garrett screwed up with the compressor housing in an attempt to make people think more turbo for the same external size as a GT3076R . Maybe they expected everyone to race out and replace their turbo with the GTX version and have it fit in the same space .

Most people are getting the idea that the GT30 turbine and housing isn't enough to drive the "GTX76" wheel and while using the GT35 turbine helps stuffing that in a GT30 turbine housing doesn't . As a minimum Garrett should have used a GTX3576R as a GT3582R replacement and used the T04S comp housing like GT3582Rs do .

Anyway , I don't think people have found the limits of this GTX3071R yet . Don't think anyones had one on a warmed up RB25 and Garrett hasn't released the next range of twin scroll turbine housings for them just yet . There is mention of these being Vband mount with a locating pin and it should help with mounting and making manifolds for them . One version is going to be T3 flanged and the word is that there will be I think three AR sizes .

I'd really like to see as I said a GTX30R turbo with a little less compressor than the 71mm mainly because I think most people would be tickled with genuine 300 RWKW performance . I would forsake the extra 35+ Kw potential to have it spin up a few hundred engine revs earlier , AND if it could fit the compressor inside a T04B comp housing it would be easier to fit an RB engine than the T04E housing is ie GTX71 and 76 turbos .

I dunno not , real hard for someone like Garrett . We know the GTX67mm compressor has 10 rather than 11 blades like the others and one site reckons this was to make the GTX67 turbos respond a bit faster . How hard would it be for them to carve out a 68 or 69mm GTX wheel or even a 10 bladed GTX71 wheel . Just a slightly bigger pump than a GTX3067R has and a smoothed up 0.63 AR IW housing would be a nice match on a street RB25 with E70/E85 . And be reasonably easy to fit and make look close to std .

Got to concentrate on rails injectors and tuning ATM so time to think about some of this other stuff .

A .

Edited February 25, 2013 by discopotato03

[scotty nm35]

Don't get me wrong, the GTX3076 is still making more power on 10psi less boost, but the transient response is woeful compared to the 71. (and I ran a 1.06 Tial rear on the 71 compared to a .82 now)

I maxed out the GTX3071 on 342kw (e85) through an auto, god knows what that is with a manual box, the GTX3076 is now making 350kw at 24psi with the gearbox starting to slip, I can only guess this is a 400kw on e85 capable turbo if someone wants to lean on it hard, but as I am gearbox limited atm, I wish I had the response back.

I am wondering how much extra energy the 1.06 rear would give the GT30 turbine, and what effect it would have on the compressor. If only it was easier to swap housings I would give it a shot for interests sake as I feel it would improve the transient response times in the upper revs at the expense of 100rpm spool. No point until I can put it to the ground though.

[wolverine]

I thought the 71mm GTX compressor felt more docile than my 76mm GT compressor. My bum dyno tells me that the GTX71mm compressor felt more like my old GT3040 when it came to transient response (on 98ron).

I don't think the GTX wheels are a step up when the old school 76mm one works better IMO and with less boost screwed in?

[AngryRB]

well mines a manual and with only 16psi making 320kw, so the auto must really sap the power, 8psi extra for 30kw gain, mine was consistently gaining 10-12kw every 1psi, stock manifold too.

Edited February 25, 2013 by AngryRBGTX

[scotty nm35]

Those power gains will change as you bump up the boost, eventually you will lose power for every psi. The turbo can only flow X amount on your current setup regardless of boost once the compressor is maxed.

Making the intake/exhaust flow more efficient will move the compressor limit higher, but pushing a turbo that hard has consequences as i'm sure you understand, which is the main reason I upgraded.

[AngryRB]

i think my point was that the compressor at 16psi has atleast another 10psi left which is probably up close to 400kw? obviously with a different manifold, with a manual and good manifold it has a shitload left in it

[scotty nm35]

No, it probably has another 40psi in it, I know because the 71 ran well over 50psi for a few days when the controller lines popped off.

My point was, pressure does not equal power, or airflow. That and every setup is different.

I would guess the auto is sapping at least 30kw more than a manual box would in my situation, and another 30kw if the converter isn't locked, which all turns to heat. Hence my track heat issues.

[34GeeTeeTee]

well mines a manual and with only 16psi making 320kw, so the auto must really sap the power, 8psi extra for 30kw gain, mine was consistently gaining 10-12kw every 1psi, stock manifold too.

My GT also made 320kw on 15-16psi (gate pressure), 348kw on 19-18psi, 363kw on 23-20psi and that is out of its efficiency range... More boost equalled less power... Still very impressed as there aren't many that reach that level... Want to try a GTX but dunno.....

[Lithium]

My GT also made 320kw on 15-16psi (gate pressure), 348kw on 19-18psi, 363kw on 23-20psi and that is out of its efficiency range... More boost equalled less power... Still very impressed as there aren't many that reach that level... Want to try a GTX but dunno.....

I am not convinced going to a GTX is worth your effort. I am hoping Bri73y will post his results from his HTA3076 when he has some to share - I've been banking on that to show what Garrett shot for with the GTX, and missed.

[34GeeTeeTee]

I am not convinced going to a GTX is worth your effort. I am hoping Bri73y will post his results from his HTA3076 when he has some to share - I've been banking on that to show what Garrett shot for with the GTX, and missed.

Yep, when will these results be happening?

I still want to know what all the hype about the GTX3576 is online, if it makes good power and doesnt cost as much as the GT3582 in lag then it could be a good thing?

[GTScotT]

I'm curious if a GTX3576R would be happy in a .63 housing.

I have seen 1JZ dudes run 35R's in .63s and they have been fine. The turbine wheel size makes up for the housing constraint and its fairly responsive.

I'm not totally confident but that could be an option in a high mounted and well gated setup.

[bri73y]

Should have some more numbers for you tomorrow. Car is getting retuned tonight!

[34GeeTeeTee]

I'm curious if a GTX3576R would be happy in a .63 housing.

I have seen 1JZ dudes run 35R's in .63s and they have been fine. The turbine wheel size makes up for the housing constraint and its fairly responsive.

I'm not totally confident but that could be an option in a high mounted and well gated setup.

Hence why it might suit my setup....

Should have some more numbers for you tomorrow. Car is getting retuned tonight!

Awesome, looking forward too it!

[GTScotT]

Yet a 363kw 3037 can't be a bad thing. Are you looking for more power or just want to try it out?

[34GeeTeeTee]

Yet a 363kw 3037 can't be a bad thing. Are you looking for more power or just want to try it out?

Its not a bad thing at all and certainly not unhappy with the car in any way, just wondering if there is any better option as the car is about to undergo a full retune so the only time to do it would be now..... I may just change my exhaust a bit and be happy with what i have, still wanted the magic 500rwhp tho

[Lithium]

Should have some more numbers for you tomorrow. Car is getting retuned tonight!

Retuned!? Man, cutting it close for the weekend - good luck!

[bri73y]

Yep, too many issues with the shitty internal map sensor in the Haltech.

It has an external 5bar map sensor now so a retune is required!

We're also only running approx 25psi for the weekend, everything's to new to kill....

[Lithium]

Bugger! I have the funniest feeling that "only" ~25psi will be enough....