Garrett GT28R - GT2860R - 55 TRIM - 310 HP

The Garrett GT2860R turbocharger model 707160-7. Also known as 7's or GT28R 7's because of the model number. This turbo is a great upgrade turbocharger for the Nissan Skyline R34 GT-R and the RB26DETT engine.

It is compatible with the HKS GT2530 Turbos. The Garrett GT2860R 7's is a direct replacement upgrade turbocharger for the stock OEM Nissan RB26DETT engines GT2556R 702987-7 turbo used in Nissan Skyline R34 GT-R. And this makes it essentially an R34N1 turbo but without the lag!!

The Dual Ball Bearing GT2860R turbo (base Garrett P/N 707160-7) assembly with T25 style turbine inlet (with studs). Comes with an internally wastegated style T25 turbine housing that is unique, and is the same as the Skyline style (tapped turbine inlet holes, unique turbine discharge pattern, and low profile housing neck) and the Nissan Skyline style compressor housing with 2 bolt inlet and 2 bolt outlet.

It also includes the wastegate actuator bracket and actuator from the factory (also unique to this turbo).

Now before I go any further you need to know that there are actually 3 different versions of the GT2860R turbocharger. The biggest differences is on the compressor. And there are also 2 different RS versions called “The Disco Potato” that I’ll need to explain more about in another post. This Garrett GT2860R turbocharger have a smaller 55 trim compressor that wont allow you to run the highest boost pressures of them all. If you look at the compressor map below you can see that it will give you good airflow but starts to max out at around 1.8 bar.

If we look at where in the compressor map the GT2860R turbocharger flows the best we see that it's in the 1 - 1.4 bar boost range. Much higher than that and the turbo probably only produce heat and you wont gain much power anyways.

However this makes the GT2860R a good choice for twin turbo applications like the Nissan Skyline because working together they will produce a solid 600 HP and because of the dual ball bearings provide you with a great spool without much of an turbo lag. And because it's a T25 flage turbo it will bolt up right away to you're existing manifold if you are just looking for an upgrade.

Looking for even more power? Have a look at the 62 trim 360 HP GT28R Turbo model 707160-5

This GT2860R alone will work well all the way down to 150 HP and will give you 310 HP if needed. The recommended engine sizes for this GT2860R turbocharger is 1800cc to 3000cc.

Model: 707160-7
CHRA: 446179-54

Bearing: Dual Ball bearing
Cooling: Oil & Water cooled bearings

Compressor
Inducer: 44.60 mm
Exducer: 60.1 mm
Trim: 55
A/R 0.42

Turbine
Wheel: 53.90 mm
Trim: 62
A/R: 0.64
Wastegated
Turbine Flange: T25 with studs
Turbine outlet: Unique "compact" 5-bolt pattern

Turbine Housing Options: There are no hosing options for this turbocharger.

 

The GT2860R use the Standard T25 oil drain flange.

Oil inlet 0.4375IN - 24 Thread for 6.35 Tube Inverted flare connection PER SEA J512 Oil inlet
Oil outlet 2 x M8x1.25 13.5 oil outlet
Water connections thread M14x1.50

With an Turbine housing cast from high-nickel "Ni-Resist" material and the Turbine wheel cast from "Inconel" material the GT28R Seven turbo will even perform without a problem in extreme applications. The Turbine housing has a unique "compact" 5-bolt outlet that is not interchangeable with traditional T25 5-bolt outlets but is a Bolt-on turbo for Nissan RB26DETT engines commonly found in the Nissan Skyline.