The Garrett GT2854R Turbocharger is the smallest Garrett turbo in the GT28 Family. The GT2854R looks similar to the GT2554R also because they are very similar turbos and share almost all parts. The only difference between the GT2854R and GT2554R is that the GT2854R has a larger turbine housing and a different turbine wheel.
The GT2554R turbine wheel have 11 blades with a 53 mm major diameter. If you look close at the picture below you can count 11 blades on the turbine wheel.
And the GT2854R have a 9 blade 53.9 mm turbine wheel. If you look at the picture above, you can count 9 blades on the turbine wheel. This all means that the GT2854R turbocharger will give you a little bit of extra power at high RPM's because it will flow a bit more on the exhaust side. The spool will be a little bit later on the GT2854R but not much. The GT2854R turbine housing is also cast from high-nickel "Ni-Resist" material for extreme applications.
Like the GT2554R turbocharger. The Garrett GT2854R turbo will give you 270 HP. It works well with 1400cc to 2200cc engines and will also be a good turbo if you only are looking for 170 HP. It will spool up pretty quick because of ball bearings used in the turbocharger.
CHRA: 446179-47
Bearing: Ball bearing
Cooling: Oil & Water cooled bearings
Compressor
Inducer: 42.1 mm
Exducer: 54.3 mm
Trim: 60
A/R 0.80
Turbine
Inducer: 42.1 mm
Exducer: 54.3 mm
Trim: 60
A/R 0.80
Turbine
Wheel: 9 Blade
Wheel: 53.9 mm
Trim: 62
A/R: 0.64
Wastegated
Turbine Flange: T25
Wheel: 53.9 mm
Trim: 62
A/R: 0.64
Wastegated
Turbine Flange: T25
Because the Garrett GT2854R turbocharger share almost all the same parts as the Garrett GT2554R turbo. Means the oil and water threads are the same for both of them.
Oil outlet 2 x M8x1.25 13.5 oil outlet
Water connections thread M14x1.50
I'm looking to buy a GT2554 or GT2854. I'm using it on an 82 CID V-Twin motorcycle. I'm confused by the GT2854 turbine map. You state that is has slower response than the GT2554, but the "2854" map starts ar 5 where the "2554" map starts at 8.
ReplyDeleteIt seems the 2854 would build boost sooner. Please explain how this works.
Thank You for the web site and your time
Hi
ReplyDeleteThank you for using my site! I can see how these two turbochargers GT2854R and GT2554R can be confusing. Let me try and explain a bit more. First of all most turbo manufacturers like Garrett don't publish full turbine maps. So we don't get all the curves showing shaft RPM and other info.
Someone else said that the GT2554R and GT2854R curves cross over each other at about 13 pounds on the horizontal scale and 1.81 PR on the vertical scale. To the left of this point is the GT2854R curve and is below the GT2554R and to the right its above. I take that to read slightly more trapping efficiency to the left and slightly less restriction to the right of the crossover point..
Other things like the 9 bladed turbine having slightly less innertia than a 11 bladed one makes a difference as well.
I try to look at what other people running these turbochargers in the real world say about them, so when I say "The spool will be a little bit later on the GT2854R but not much". That's what you should expect.
But really because these two turbochargers are so similar, on a 1.6L Miata engine where both turbochargers had been tested it was reported about a 5% difference. The GT2854R runs very much like the GT2554R but with slightly higher top end power. I can't see you go wrong with either of them, if you can find a Garrett GT2854R or GT2554R for a good price then go for it.
Do these BB turbos require a restricted oil feed fitting?
ReplyDeleteI have mixed information. Some say it's built into the housing, some say it's required in the oil feed fitting.
Thank You
Hello, normally the turbos should come with a restrictor fitted. However it is easy to check if you look into the oil inlet you should not be able to see the ball bearing cartridge rotating if it is fitted with a restrictor like you can if you look into the oil outlet on the turbo.
ReplyDeleteHello, very good info here!
ReplyDeleteRegarding restrictor - should be 1mm or 1.8mm?
Also, do you have any info about TB2815 from Nissan S14a?
ReplyDeleteHello mihai.anton, the restrictor size depends on how high the engine oil pressure is on your engine. If you are running a normal stock oil pump and not revving the engine too high then you can use a bigger 1.8mm restrictor. The only real problem going too big on the oil restrictor is that the turbo can become slow to spool up due to excessive oil in the bearings. And worst case you can notice some blue smoke or oil start leaking into the compressor housing or boost pipes.
ReplyDeleteIf you however go with too small oil restrictor and don't have enough oil pressure in your engine then you can starve the turbo of oil and damage the bearings. So it is better to go bigger and then go down in size if you are unsure.
As for the Garrett TB2815 turbo it is an older turbo but very similar in size to the GT2860RS turbocharger with a 47.20mm compressor inducer and 53mm turbine. I don't have a compressor map but from the dimensions alone it should support around 350hp. However unlike the more modern GT2860RS turbo the TB2815 turbo use journal bearings, so it will spool slower due to that. On a Nissan S14 engine the TB2815 would probably get to full boost around 3500-4000rpm. And with the ball bearing GT2860RS turbo it would spool up around 500rpm sooner and support a bit more power due to the modern compressor wheel design.
Hello,
ReplyDeleteI have a new GT2854 and I need a new turbine. I have searched to the end of the internet for this part. I can only find a 53.9 X 47 wheel for this turbo.
I did find a 9 blade hi-flow for GT 2554 that measures 53 x 42.
Are the turbine shafts the same?, as this is my only option without buying a cartridge.
Hello yeliab1, Garrett normally don't sell parts to repair ball bearing turbochargers. They want you to buy a new whole cartridge instead. You can find aftermarket turbine shafts for sale.
ReplyDeleteThe GT28 line have a long 112mm and 109mm shaft but also a shorter 103mm shaft that's used. You need to make sure what length your shaft is first.
You can get turbine parts from Mamba or Kinugawa for a good price. I see turbines for sale from different sellers on aliexpress and ebay also.
This is the long shaft version.
https://shop.mambatek.com/9-Blade-Garrett-GT28R-Flow-turbine-wheel-47-538-Length-112mm-012-0103.htm
You can contact them and ask if it's correct but also make sure the CHRA P/N: and TURBO P/N: are the same for your turbo.
Thank you JD. Extremely useful info here! I have healthy CA18DET with all modes for Stage2, boost 14psi but I will run Stage1 chip because the car is more daily and I want to be safe. In conclusion, is better to use GT2854R than a TB2815 from S14a? For me quick boost is more important than top end power.
ReplyDeleteHello mihai.anton, on the CA18DET the GT2854r should make around 1 bar boost / 15 psi at 3000rpm. So they do spool up quick even on smaller engines.
ReplyDeleteMany thanks, thanks to your advices I can buy the Turbo now with much more confidence! :)
ReplyDelete