Sunday, September 2, 2012

Garrett GT28R - GT2860R - 55 TRIM - 310 HP - 707160-7

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.

I also have more technical pages for you that will come in handy. They will be of great help when looking at compressor maps Use the conversion tools And you will be able to calculate airflow, pressure and HP figures for the turbocharger you are interested in.

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Folks don't forget about racing safety gear when buying auto racing parts

I have been tuning engines for a long time and with that experience I tend to look a bit more at how other people tune their cars and bikes than anyone else. Now this is not true for everyone, but most of you will recognize yourself at some level.

About 25 years ago the level of tuning an ordinary street car would ever see was at most 30% increase in power. (Not true for every car out there, but I'm talking ordinary street cars here)

So if you had an Ford, Volvo or BMW the amount of power you could get would have been in the 150hp range and in some extreme cases 250hp. At this point this was the "limit" of ordinary naturally aspirated engines at that time. Yes there was a lot of racing going on at that time, and some of these race engines did get put into street cars and power levels would have been 300+ hp. But the amount of maintenance these race engines required and the cost to keep them running were too much for most people.

Back then you could not just go into a racing store and buy yourself a set of forged pistons and connecting rods. Let alone camshafts and valves to build your race engine.

With the introduction of turbochargers however the power suddenly increased to levels that are still uncommon in today’s cars. At the beginning people where not really sure how to tune turbo engines and intercoolers where something that most people had never heard of. Silicone hoses where did you get that?

You would have to know someone in the maintenence department that did service on trucks or busses that had turbocharged Diesel engines at the time to buy the simple things like, clamps, hoses, gaskets, oil lines etc. Even something like an external Wastegate that are availiable almost everywhere now today you could not get your hands on. And something like real drag tires where not that common either.

But as time passed by, engine tuners got their hands on more parts, most that had the machines and tools started to make their own intercoolers, wastegates and all the parts that were hard to get and the knowledge and the tuning business took of.

Now it still took some time before engine management systems and electric fuel injection where you could really start to extract power out of engines became common and figure out how to tune the software to make that work. To start if you found someone who could tune these you would have to fork out serious doe to get everything working. Well you still might have to do that today, and serious race teams do spend alot of money to get the electrical side working right. Today there are so many more things you can do with a powerful ECU, like traction control, different boost pressures for low and high gears, launch control, shiftcut etc.. This list is very long.

But before all that came chip tuning and fuel injected turbo engines. What was unheard of just 20 years ago would now become a reality for anyone with a few minutes of tuning. Some of you might know the story of the Ford RS Cosworth, Nissan Skyline, Audi S1 Quattro, Lancia S4 to name a few and other icons of the late 1980 and early 1990. The turbo engines back then would give you 200hp and that is still today 25 years on about the same power level you would get from a new car. However today this is a common power figure for a station wagon. And back in the 80s only a few racing breed turbo engines would give you that.

But with a few changes to the ECU with chip tuning and some larger fuel injectors all that was needed then was to turn up the boost pressure and 350hp where unleashed. The only real limit here was only how much air the standard turbocharger could supply.

Sure there where different levels of basic tuning you could do but the effect was the same, more power.

With more and more tuner friendly cars coming out over the years the power figures are still holding almost the same. Just until recently where the powerfigures have really started to go up and beyond what was thought possible only a few years ago..

But what have really changed today is the huge amount of DIY tuners out there. What engine tuners did 25 years ago have now entered the garage and racing parts have now become widely available to anyone. From the cheap Chinese made turbo exhaust manifolds to wastegates and almost every tuning part you can think of to the pure racing parts like forged pistons and engine management systems on sale that anyone can buy.

So what has happened is anyone with a little background in mechanics can now build their own race engine. Power levels have just gone up and up and up.. It’s not uncommon to see street cars today with 500hp and then there are the ones who have gone even higher, breaking the 1000hp barrier.

The one thing that all these engines have in common to achieve such power levels are of course the turbocharger. Without the turbo it would not have been possible. Well a supercharger or N02 injection could do the job too but that’s another story.

However time and time again people forget the most important parts when tuning cars. I’m talking about safety and racing safety gear. I do see that people buy racing seats and that’s good. But most of the time they don’t buy racing seats because of the added safety. It’s because they think racing seats look good. And what about things like auto racing helmets that keeps your head intact. Most of the time people come to the track without real racing helmets and if it’s street racing that’s taking place, no one seems to bother wearing any kind of racing helmets at all.

I do understand that people feel protected inside their cars and they don’t think they need roll cages and in some cases opt for roll bars instead but you really need to think about this.

Some of the racing safety gear you should look at are the following:
racing suit
racing shoes
racing helmets
racing gloves

This would be the minimum for my liking if your going on a trackday or similar race day event with your tuned car.

In case you don’t have a fuel cell in your car and there is a chance of fire or fuel leak then you should consider racing fire suits also because these will save your life.

Fire is not to be taken lightly. If you have a good fuel system in place to feed your engine and anyone who are looking for power is going to have that. Then you need to understand that at any given time those racing fuel pumps are pumping 2 gallons of fuel every minute. And if you get a leak and have an accident you are in real trouble if the power to the pumps are not cut right away.

So having the right racing safety gear to protect you is always a good choice. Today’s car are much safer than the ones years ago, but you need to understand that when we double and triple the amount of power and turn our 100mph car into a 200mph fire spitting monster of a car you really, really should spend some time and pick out some racing safety gear also.