Looking to upgrade the 300TDI turbo.
So far I have a cheap option (variable vane turbo off a 2.2 petrol) or a dearer option in a Garrett GT2554R ball bearing turbo.
What I know:
* The VNT off the petrol with a restrictive exhaust would have produced max boost around 12psi. This is a 2.5 diesel but max revs are waaaay lower than the petrol. Given it has no waste gate, I'm unsure as to whether I will still need to install a waste gate which would be a ******.
* The VNT is in the same HP range as the ball bearing turbo
* I need to spend $500 on a manifold insert or make my own
Also not sure what boost TDI's run std. I'll do a search for that in a minute, but is anyone knows for sure I'd be glad to hear. Do now, 15PSI!
Now I know Jase is selling the Brazilian TGV turbos, but what I am looking at will top out at $1,500 in cost if I don't build the manifold centre. If I do we're talking around $1k. So they don't compare, unless there's a deal to be busted.....
My preference is ball bearing, but I'm more than happy to take on opinions and the ball bearing option will cost me about $400 more than the VNT.
Thoughts?
Moderator
standard boost is 1.1bar/15.5psi.
If you do a search, I've posted some OE turbo specs in the last couple of months and IIRC it included links to a few sites so you can work out A/R's, trims, wheel sizes, etc.
I'd either use Jase's VNT, an MTQ TD04 kit or a properly sized Garrett GT/R.
I haven't been able to work out what the differences are between the various GT2265V's yet.
Ripper!
So stock no's for the TDI T250-04 Garrett and the GT2554R next to them:
A/R = 0.47 0.80
Inducer = 38.15mm 42mm
Exducer = 53.72mm 54.3mm
Trim = 60
Turbine wheel
Exducer =35.41mm
Inducer = 47.24mm 53mm wheel dia
Trim = 62
A/R = 0.64
The GT2554R is listed as a replacement for the T25. See:
TurboByGarrett.com - Catalog
And it's the smallest ball bearing turbo they make. Can't seem to find the direct comparative info for the genuine LR version though.
ForumSage
A VNT will spool sooner and produce more boost than a fixed geometry bb turbo. Provided it's sized correctly of course. Tell us the model numbers.
You can replace the vacuum actuator with a pressure actuator, a 2 bolt wastegate one will bolt into the same brackets but you'll need to cut and thread the shaft to the right length.
Bewdy, that solves that problem.
The unit is a: Model # TD2501 part # 465599-6
Off a 2.2 litre petrol.
ForumSage
Well damn, that's an old one. One of the first VNT turbos ever.Originally Posted by up2nogood
If you want variable vane then I'd go for one of the newer GT models. But if you get the old VNT25 cheap enough it'd be worth playing with.
Being old, do you think it's worth the drama of fitting it? It's internals are GT25, so easy to get bits for, with the possible exception of the carbon seal.
ForumSage
I would, just to see how it goes.
You won't need the carbon seal if you rebuild it, diesels don't have an intake vacuum so don't need them. Labyrinth seal will do the job.
Just found the specs of the VNT25:
Compressor housing A/R .48
Exhaust housing A/R .64
Compressor inducer 36 or 40 mm
Compressor exducer 52 mm
Update:
I'm having the VNT25 shipped over from the states and it's brand new, not used! Looks like it is an obsolete spare part for a Shelby CSX (Dodge Daytona) from 1990........
Still, it only cost $550 so I reckon we're on a winner. Same internals as a T25 which is quite similar in terms of size to the standard 300TDI one.
Thanks to Dougal (who's going with a VNT off a Mercedes Sprinter/ML270) for some info on the one I was looking at.
Now all I need is a dummy cylinder head and a set of exhaust manifolds so I don't have to disable mine.
Anyone in Sydney/Newy got a cracked cylinder head and a manifold they don't need for a few months while I fab up a manifold in my spare time?
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