Thread: Garrett GT28R on 300Tdi

Originally Posted by Bush65

From your 1st post, it seems you have a faulty wastegate actuator.

Buying a TD5 turbo and another exhaust manifold to be able to put this turbo on a 300Tdi (if indeed it is possible to get a suitable manifold) is a troublesome and $$$$ way to fix the original problem for little or no advantage.

Hi Bush65,

Yes, the waste gate actuator is faulty. I haven't pulled it off yet but I'm guessing the diaphragm has disintegrated or at least has a hole or a tear in it. I've disconnected it and blocked off the hose to stop the boost bleeding out there, and now just keep a very close eye on the boost gauge so as to not overboost. Correct me if I'm wrong but this eliminates that fault (?), temporarily of course.

The history is that I bought this vehicle as a restoration project and it already had the T25 exhaust manifold and GT28R on it. It was running/driveable but hardly making any boost. I thought at the time this was just because the hose to the waste gate actuator was resting on the exhaust manifold and had melted through, meaning that a lot of the boost was going out there, but as it turns out that was only the start. I'd be quite happy with the standard turbo, but it's a long way back now, and if I'm going to have to buy a turbo, I may as well get something a little better.

I have another question (for anyone) - what type of exhaust flange does the TD5's standard Garrett GT2052S turbo have? I'm finding some with what looks like a T25 flange and others with a 3-bolt flange (can't work out what that is called).


Thanks again,
James.

Originally Posted by rainman

I finally got a chance to drop into MTQ yesterday. They've recommended a Mitsubishi TD04-11G. It will have the T25 manifold flange but I will need to change the exhaust flange (no big deal I suppose), the oil drain fitting, and fit a 90 degree silicone bend to the compressor outlet. I did forget to ask about the spec of the wastegate actuator but will ensure it's around 15psi, preferably adjustable.

It seems a fairly easy option. Would anyone care to cast their opinion before I jump in?


James.

I would ask them for more detail (A/R numbers, etc).

The TD04-11G-4/5 were mainly fitted to 2.5L diesels, including the dreaded RR VM. At first glance it seems like it will be too small. Dougal can give you a definitive answer.

Bear in mind, most turbo shops will sell you setups that boost to ~9 psi, because that is what they think the nissotas can handle when bolted to factory NA engines. They don't know that the 4BD1 is a million x stronger and was factory boosted to ~17 psi. They also probably recommend a specific turbo because they get a good price on it.

EDIT - I have no idea where this document originated from, but it lists a TD04-15G fitted to a 4BD1T, which sounds like a much better size.
http://www.stealth316.com/misc/mhi-t...ons-melett.pdf