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Engine Specific Info and Questions => IDI Engine => Topic started by: Benjamin on March 06, 2011, 06:31:20 am

Title: ball bearing turbo
Post by: Benjamin on March 06, 2011, 06:31:20 am
Guys,

Probably you allready know this, but i was so enthousiast when i read this.
These days newer stock VNT turbos are bb (ball bearing)
you can reneconize them by reading the garrett types

gt1749v
gtb1749v is ballbearing

they would spool quicker, and should be possible to run more rpm

Greetz, Benjamin
Title: Re: ball bearing turbo
Post by: R.O.R-2.0 on March 06, 2011, 09:06:40 am
ive never heard anything about the B series VNTs being ball bearing..

how for sure are you? your not just assuming this right? got some proof to back it up?
Title: Re: ball bearing turbo
Post by: blackdogvan on March 06, 2011, 09:25:59 am


I think a K in the part number denotes water cooled. I'm pretty sure the B is the second generation VNT vane design where the vanes are supported from both sides like this GTBXXXXXX:

Search TDI club for GTB2056VK & you'll see what I mean, there are a few build threads.

(http://images.thesamba.com/vw/gallery/pix/595746.jpg)
Title: Re: ball bearing turbo
Post by: rallydiesel on March 06, 2011, 09:48:58 am
gtb series is not ball-bearing.
Title: Re: ball bearing turbo
Post by: R.O.R-2.0 on March 06, 2011, 09:56:59 am
Quote from: rallydiesel on March 06, 2011, 09:48:58 am
gtb series is not ball-bearing.

i didnt think soo..
Title: Re: ball bearing turbo
Post by: galaboff on March 06, 2011, 10:54:45 pm
Quote from: R.O.R-2.0 on March 06, 2011, 09:56:59 am
Quote from: rallydiesel on March 06, 2011, 09:48:58 am
gtb series is not ball-bearing.

i didnt think soo..
rallydiesel is right
Title: Re: ball bearing turbo
Post by: Benjamin on March 07, 2011, 10:33:21 am
only avaible in Dutch, you can translate the latest paragrafe down under in the page.
http://squadra-tuning.nl/NL/techniek/JTD_tuning/JTD_turbo.html

The local alfa specialist tuner says on the newest engine's 2.4 and 1.6 there is a GTB serie, and he tells on his website this is a ball bearing turbo. I am indeed assuming the B stands for ballbearing, but i dont think the tuner would write this if its not.

Alfa 159 2.4JTDm 210hp (not 200) from 1/2009 and newer got the Garrett Honeywell GTB2056V, he claims this is a ballbearing axle/shaft.

He says also the Alfa Mito 1.6JTDm is with the newest generation turbocompressors like the GTB2056v, this Mito got a Garrett Honeywell GTB1446V.

Greetz, Benjamin
Title: Re: ball bearing turbo
Post by: blackdogvan on March 07, 2011, 10:37:04 am
Sorry, my post sucked & wasn't clear. If its a ball bearing turbo it would need to be water cooled and therefore would have the K in the part number as I see it. The b does not stant for ball bearing.
Title: Re: ball bearing turbo
Post by: R.O.R-2.0 on March 07, 2011, 11:02:33 am
Quote from: Benjamin on March 07, 2011, 10:33:21 am
only avaible in Dutch, you can translate the latest paragrafe down under in the page.
http://squadra-tuning.nl/NL/techniek/JTD_tuning/JTD_turbo.html

The local alfa specialist tuner says on the newest engine's 2.4 and 1.6 there is a GTB serie, and he tells on his website this is a ball bearing turbo. I am indeed assuming the B stands for ballbearing, but i dont think the tuner would write this if its not.

Alfa 159 2.4JTDm 210hp (not 200) from 1/2009 and newer got the Garrett Honeywell GTB2056V, he claims this is a ballbearing axle/shaft.

He says also the Alfa Mito 1.6JTDm is with the newest generation turbocompressors like the GTB2056v, this Mito got a Garrett Honeywell GTB1446V.

Greetz, Benjamin

i think blackdogvans explanation is a little more believable.

someone tear one apart and take pics of the bearings. i bet they are still journal bearings.
Title: Re: ball bearing turbo
Post by: lord_verminaard on March 11, 2011, 12:29:11 pm
I always thought that BB turbos are not great for diesels because of the high turbine RPM's that diesel's usually run compared to a typical gas car.  At very high turbine speeds, journal bearings are king since a floating oil film has much less drag than a ball bearing.  Low turbine speeds, it's a different story...


Brendan
Title: Re: ball bearing turbo
Post by: R.O.R-2.0 on March 11, 2011, 12:48:55 pm
so basically put, the BB turbos are great for spool up, but thats about it?
Title: Re: ball bearing turbo
Post by: lord_verminaard on March 11, 2011, 12:51:22 pm
That's my understanding of it.  But don't take my word for it.

Brendan