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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: rodpaslow on April 04, 2014, 12:05:35 pm

Title: turbo size
Post by: rodpaslow on April 04, 2014, 12:05:35 pm
I have been looking into turbo's for upgrading a 1Z TDI.  I'm not scared of just about anything going into it.  I'd like to be able to increase it's torque at least 25%, or more.

The question I have is can you go too big with a VNT?  I've seen a T25 with a 39.8/51.4 compressor wheel and a 52.7/46.2 turbine that is vnt.  Part #465599-6.  Is this too big for good lower end (2000 rpm or so) spooling.   This one though is water cooled.

I've seen lots of posts talk about K14, but it sounds like you can't go above 18 psi with that.  I'm not sure I want that.

Any help is appreciated.  I'd like to be able to hit 200 ft.lb of torque with this engine if possible.

Title: Re: turbo size
Post by: vanbcguy on April 04, 2014, 03:51:30 pm
The holsets I've seen popping up lately in the IDI sub-forum are a good way to go.  The GT2052 is a well proven wastegate turbo as well.  Remember if you want to go VNT you need to have your computer reprogrammed to know how to control a VNT rather than a wastegate.

Yes, you definitely can go too big with a VNT.  For comparison's sake, here are a few popular upgrade turbos on the VNT side for VW TDI engines, and then the projected power output with that particular turbo (and all the other mods needed obviously)

(https://www.darksidedevelopments.co.uk/product_images/uploaded_images/turbocomparison.jpg)

(https://www.darksidedevelopments.co.uk/product_images/uploaded_images/turbocomparison2.jpg)

These are from the Darkside Developments site - some other info there too, worth looking at the page even if you aren't buying a turbo from them:

http://www.darksidedevelopments.co.uk/products/garrett-gtb2260vk-gtb2056vk-and-gtb1756vk-turbocharger-with-vacuum-conversion.html

The turbo you are talking about with a 52.7/46.2 turbine is probably way too big for you - while we don't know the AR etc a similarly sized turbine on one of the Darkside turbos there is saying it spools by 3300 RPM.  You'd have almost no usable power band.

Actually that set of numbers looks like a turbo with a really big turbine and a really small compressor.  Definitely not what you want.

Title: Re: turbo size
Post by: rodpaslow on April 07, 2014, 02:32:05 pm
Thanks, definitely helps.

Weather is co-operating this week, will start tearing 1Z out of a passat to put in a newer 99 MK3. It will just be a MTDI once done, with a throttle & boost controlled vnt.  I have been looking at a Gt2052V - looks like it's the one to go with on the power goals I have.

Thanks again!
Title: Re: turbo size
Post by: smokeinmirrors on April 07, 2014, 06:23:30 pm
I'm sure you've seen this thread on 'that other' diesel forum regarding the wastegated 2052-

http://forums.tdiclub.com/showthread.php?t=360678

and this incriminating video - https://www.youtube.com/watch?v=T-4DwjGmbIw

I drank the kool-aid and have a GT2052 p/n 727264-5001S sitting in my bedroom along with a schnellsnailperformance manifold adapter. I've read nothing but good things about this turbo and am looking forward to getting it on. Just waiting for a few more parts to show and then i'll dig in and do a write up on my findings.