Thread: GT3076R-WG Opinion

So I came across a great deal on a turbo that was “advertized” as something close to the market I was looking for. By great deal I mean half the price of one brand new and it was practically brand new; and by “advertized” I mean it was said to be a GT3076R-WG-c10. I’ve been thinking of moving up to a WG 76 or 71 for a year or so now, so when I came across this bargain I didn’t see the harm in picking it up. To my surprise though I got this cartridge:



• Compressor --- Wheel: 76.1mm x 54.97mm w/ 52 trim A/R .50
• Turbine --- Wheel: 56.5mm x 53.6mm w/ 90 trim A/R .64

Which as far as I can tell is pretty much spot on for an Incon GTBB37. So needless to say I’m pretty happy with the purchase. I have a well made divorced j-pipe that is going to be modified to work with this turbo, so I’m not worried about the issues most people see with t25 housings on these larger turbos; however the one thing that is troubling me is the size of the housings. Both A/Rs are pretty low, and I know the turbine will see some chocking before redline.

Anyways, I was looking to get some opinions on what people think it will perform like. I’m not huge into looking for a number, just getting tired of the old t28 and looking for something as an easy upgrade. Particularly I’m looking for Miko’s opinion ‘cause I know he’s a HUGE fan of the GTBB37.

Oh, and a quick overlook of the engine:

RNN14 GTi-R engine bored to 88mm
Calum ECU RT v2
Z32 MAF
700cc inj. w/Nismo FPR
Kelford 186-A Cams (270 Dur.)
3” Divorsed J-Pipe
3" Downpipe
3" Exhaust
Hotshots GTi-R FMIC Kit

It will make about 400whp. You can push these turbos to 450, or even 475whp, but they fall out of efficiency and the exhaust side is going to choke. But Many people run garretts past their efficiency, sacrificing reliability.

This is a completely different turbo than a 37. If you are looking for huge #'s then you

need to keep looking for a bigger turbo. A GT30 is a great all around street stoplight to

stoplight turbo. IF this is what you want than the GT30 is going to be the turbo for you.





Chris.

zer099, The Incom GTBB37 CHRA was 700177-0011.

What made this turbo perform so well was the turbine housing. It came with an off center turbine wheel which allowed for a proper alignment of a down pipe and it had an internal wastegate that was divoreced.

I have made 420-440 to the wheels, on SR20DETs and seen the same on MR2 3S-GTE between 20-23 PSI

I would switch the exhaust housing to the .86 a/r. I know several people running this turbo or a version of it.

I agree. I have a GT3037s- 57t .63ar (aka gt3076) im on 17psi and on the streets light to light im a monster but on the freeway its not so good. The advice im getting is go a 82 ar with a 3" dp and it will be a different ride. With increasing ar you will get some lag but great top end

You do realize he said he is looking for something as an easy upgrade to his GTIR turbo. So if GTIR turbos are good for 300-325 and this tubo is an easy 425 WHP turbo at 20 PSI. I would call this and easy bolt on upgrade with a 100-125 WhP increase.

This turbo should get him 11.3-11.5 sec @ 124 MPH range.

This turbo and GT30R turbo are both called GT3076R turbos

A GT30 Turbo and this turbo are in the same WHP range. GT30 turbos are basic 450-550 WHP turbos and the turbo he has or GTBB37 turbo is listed as a 450-500 WHP turbo. This turbo just has a slightly smaller turbine wheel to a GT30 turbo and shares the same compressor wheel as some of the GT30R turbos.

Ball bearing CHRA turbos GT Series - Garrett Racing turbochargers - Applications - TurboMaster

I just got basically the same turbo, except mine is a 3071, with the .86 hotside. Which compressor housing did it come with? I'm really diggin the T04E housing, it clears everything without grinding and the ATP 2860 disco potato wastegate bracket will work with a little deeming of the holes. It also seems that the best gasket for it may be the non-gtir for the 5-bolt, as it looks like it might need to be reemed, but both the 3071 and 3076 may have boost creep issues if you have a stock O2 housing, I have one of the screamer pipes made by that guy in Aussie though.

Yea, I got it with the T04E housing and it actually turned out I got the .86 A/R housing as well, so I was happy. I have a divorced screamer on it and haven't noticed any creep issues. I'm happy as hell with the setup.