Garrett Medium Frame Gtx Turbos

[ShiftyTys]

I will say my 2c the last time, I think the GTX3076R is a waste of time and money. Use a normal GT3076R, if you want more power go a GT3582R.

In what way is it a waste. Just a summary will suffice thx

[Lithium]

The GTX series turbos seem to be laggier than their GT series counterparts - so while a GTX3076R flows better than a GT3076R, its also laggier. It makes it comparable to (and this has been proven) to a GT3082R in terms of power and lag. The problem with that you pay the price for a fancy new turbo that does nothing better than a previous already existing unit.

In effect they are bigger compressors in terms of flow, cost and lag but with equivalent naming and the same flow on the turbine side - meaning things like a GTX3076R stands to choke, which could also be the case with a GTX3582R though thats just speculation.

[wolverine]

Try this...

Results:

SR20DET fitted with a GTX3076 .82 tuned with BP98 Fuel - 408hp @ 1.5bar

Well the GTX3076r looks to be identical to the GT3082r ! (both turbos were using the same rear housing)

Below is the Power and torque readings @ 1.5bar

The boost actually starts off at 1.4bar and creeps to 1.5bar toward redline

Thick line is Hi boost setting, Thin line Lo boost setting

It had almost the exact same power delivery

Below is a graph of both turbos

Thick line is the GT3082r which made 409hp at the same boost and 445nm of torque - Thin line is the GTX3076r - 408hp and 437nm of torque

Interesting..

[D_Stirls]

I will say my 2c the last time, I think the GTX3076R is a waste of time and money. Use a normal GT3076R, if you want more power go a GT3582R.

Yep from the limited results that i have seen i tend to agree with you. it seems to look like this in terms of power AND response.

GT3071R

GTX3071R=GT3076R

GTX3076R=GT3582R

GTX3582

Garrett have made some bigger flowing turbos but seem to have just matched the performance to their old turbos that were one size bigger.

What i think was behind the introduction of the X series was that Garrett were concerned about the fact that some of the smaller companies were catching up on them and taking some of their market share. To counter this they updated their old series of turbos (and at the end of the day the X series is an update at best because the only thing that has changed is the compressor wheel and compressor housings on some).

The reason that they used billet wheels is because they didn't have to go out and spend $200,000+ on tooling up for a new set of cast wheels, and it also meant that they hit the market earlier as it takes time to tool up. I don't see that they planned these turbos to be a long term answer to the other manufactures but would buy them some time while they developed a complete new series. Also buy using billet wheels they can be a lot more dynamic with their designs as they can change them at anytime with out being up for huge tooling costs.

I was thinking about using a X3071R but after seeing the results i won't, due to the fact i'm running a 1.8 litre. Instead i'll stick with the old 3071R and a TS housing because the new version doesn't match it's response. I'm also interested in the EFR series as their results seem to be a lot more promising.

Edited February 15, 2011 by D_Stirls

[ShiftyTys]

So better to go gtx3071r with .73? On my rb25

[Lithium]

If you can get one for equal to or cheaper than a GT3076R, otherwise a GT3076R would make more sense.

[ShiftyTys]

If you can get one for equal to or cheaper than a GT3076R, otherwise a GT3076R would make more sense.

The only issue is I've seen forums on different sites show the gtx3071 have the same spool as gtx3076 due to same exhaust wheel. Yet be power capped to smaller compressor wheel. And they recon gtx3071 is pointless based on those findings.

What are your (or anyone elses) thoughts on this?

Thanks

[R31Nismoid]

as it has a smaller compressor, thats impossible

just because it has a larger rear, the smaller front will actually spin up and produce boost earlier if the shaft speed was equal.

a 71 shouldnt be identical in response to a 76

this is not necessarily easy to tell on a dyno however FYI

[ShiftyTys]

as it has a smaller compressor, thats impossible

just because it has a larger rear, the smaller front will actually spin up and produce boost earlier if the shaft speed was equal.

a 71 shouldnt be identical in response to a 76

this is not necessarily easy to tell on a dyno however FYI

Oh I see. But surely it would show on a boost vs rpm Duno graph.

Because on boost vs rpm: gtx3071 showed identical boost levels at same rpms as the 3076. Unless yours saying it gets to those rpms quicker?

[ShiftyTys]

Something to read.. (where I got my initial thoughts from)

http://forums.nasioc.com/forums/showthread.php?t=2110277&page=4

Scroll dkwn to results and Read on to page 5 As well. In fact start from page one if u want. Perrin (Subaru guys) in the states do some good dyne testing for response and power between gt and Gtx series.

[juggernaut1]

I say split the difference and get a GT3076 with 52 trim comp from GCG.

GTX3071 is just a GT3076 in disguise

GTX3076 is just a GT35 in disguise.

Edited February 15, 2011 by juggernaut1

[ShiftyTys]

I say split the difference and get a GT3076 with 52 trim comp from GCG.

GTX3071 is just a GT3076 in disguise

GTX3076 is just a GT35 in disguise.

Haha. I'm leaning towards gtx3071. Hoping for same flow and power as gt3076 but a tad less lag due to slightly smaller/lighter comp wheel.

[Lithium]

Haha. I'm leaning towards gtx3071. Hoping for same flow and power as gt3076 but a tad less lag due to slightly smaller/lighter comp wheel.

With that amount of money, you're definitely braver than I am. I'd feel much more confident going with something like a Borg Warner EFR7064.

On paper the GTX3071Rs looked good, but now the GTX prove to be laggier - and a GT3071R is virtually identical in spool to a GT3076R... I'm not sure the result is going to be worth it.

[ShiftyTys]

With that amount of money, you're definitely braver than I am. I'd feel much more confident going with something like a Borg Warner EFR7064.

On paper the GTX3071Rs looked good, but now the GTX prove to be laggier - and a GT3071R is virtually identical in spool to a GT3076R... I'm not sure the result is going to be worth it.

I know nothing about the Borg Werner. What kind of response and power are we talking an an rb25? In comparison to the gt/Gtx turbos?

[ShiftyTys]

I know nothing about the Borg Werner. What kind of response and power are we talking an an rb25? In comparison to the gt/Gtx turbos?

Also I can get the gtx3071 cheaper than the one ur suggesting.... But money is irrelevant.

Just don't want to WASTE my money when I can buy a better product.

[islade]

I say split the difference and get a GT3076 with 52 trim comp from GCG.

What's the advantage of a 52trim instead of the usual 56 trim?

I just bought one that was a 56 trim. I'm guessing the 52 trim has slightly less flow so it's slightly less laggy?

[juggernaut1]

What's the advantage of a 52trim instead of the usual 56 trim?

I just bought one that was a 56 trim. I'm guessing the 52 trim has slightly less flow so it's slightly less laggy?

Correct. In fact I have my 3076 52 trim spooling earlier than my previous 3071 on my SR20, the qualification here is that I also fitted a 3.5 inch turbo back exhaust (previously 3 inch turbo back exhaust with the 3071). The dyno says it also makes more power earlier, and my bum confrms it.

[zebra]

Hmm was it this thread? right at the beginning where I said the 58trim comp wheel will negate any advantage of the ligter materials and newer tech.

Seems to be turning out a little like the Presision billet turbos, where the resellers were singings its praises and getting huge power from small turbos, then the "REAL" results came out and they were rather average.

[badhairdave]

garrett: it's lighter, billet and has new tech! it's awsome

zebra: none of that means shit. the small increase in trim means it'll spool the same as the next size up gt wheel.

[zebra]

garrett: it's lighter, billet and has new tech! it's awsome

zebra: none of that means shit. the small increase in trim means it'll spool the same as the next size up gt wheel.

thats what I was getting at, a lot of people have been saying they will spool the same as the next size down and make more power.

Imo the GT comp wheels are fine as they are/were, its the turbine that needs work