Holset HX30 Turbo on a Fuso 4d34T?

[aschafer14]

Has anyone swapped out their TD05H for a HX30. From what I found online the the manifold flange should be identical. I have one on my 4bt and love it, it spools up quickly and boosts to 20psi without a problem. I believe it also has a larger outlet flange which would alleviate the small outlet on the TD05.

 

[Aussie Iron]

No experience with it but have heard from someone that has done one that it is far better than stock. I myself would like to hear if you do it how much better it is.
Keep everyone informed if you do it. Will it boost from low revs and how low, how much boost at what revs. That is important for our low down torque.

Dan.

 

[soaringpotato]

I hope someone corrects me if I'm wrong...it's my understanding that the turbo flange used on our Mitsubishi trucks with 4D34 (at least on my 2000 FG639) is a DSM T25 flange, which apparently is slightly different than the standard T25 flange. Furthermore the Holset HX30 series use a T3 flange.

There are adapters like this on the market that could help us? https://jmturbo.com/products/turbo-...t3-adaptor-turbo-manifold-flange-adapter.html

I've also heard of aftermarket manifolds for our 4D34 that already encompass a standard flange for aftermarket turbos.

 

[aschafer14]

@soaringpotato Looks like you are correct. After some more digging I found an image of a stock manifold gasket with the same bolt spacing at the DSM TD05/T25 so it looks like I'll need an adapter or find an aftermarket manifold. I haven't had much luck finding any manifolds, the stock one looks pretty restrictive so I wouldn't mind upgrading that while I'm at it.

DSM TD05/T25


T3 Flange on HX30

 

[aschafer14]

It looks like these industrial/forklift manifolds might have the right mating flange but fitment may be an issue as these orient the turbo upwards for the non-intercooled variant.

 

[Aussie Iron]

It looks like these industrial/forklift manifolds might have the right mating flange but fitment may be an issue as these orient the turbo upwards for the non-intercooled variant.


View attachment 896725

View attachment 896726

Yep, manifold looks about right on the engine. Rotate the cold side of the turbo so it faces down and run the pipe forward to the intercooler in front of the radiator. Use an intercooler from a FE73. The inlets and outlets tuck around the radiator just above the chassis.

Dan.

 

[aschafer14]

I've been trying to find an oil drain fitting/adapter for the block side. Does anyone know what this fitting size is? The parts diagram lists the o-ring as D=17.

For the supply line it looks like I can use this M10x1.25 banjo to AN adapter.

 

[aschafer14]

Well I received the industrial manifold I posted about above and unfortunately it has a T2/T25 flange (I probably should have looked into the "25" cast into the manifold in the picture). Now I need to determine if I'll just get an adapter for the stock manifold or for the new one.

I found this other thread where @JDMBrian installed an HX30 and said he bolted his up to the manifold that came in the kinugawa turbo kit. I contacted kinugawa to confirm and they said it has a TD05 mating flange so I'm not sure if I missing something else he did.

 

[soaringpotato]

I picked up this T3 to TD05 adapter off eBay to test with-> https://www.ebay.com/itm/201781969454
Just waiting on delivery.

 

[aschafer14]

@soaringpotato I was looking at a similar adapter but it looks like it is rotated 90° from where it is supposed to be. The long side of the flanges should be aligned but maybe it is just the image. The other problem is the offset, I tore everything apart today and it looks like there is only about 1" of clearance between the turbo and the tube for the cab mount.

 

[aschafer14]

Here is the new manifold test fit. If the bolt pattern would have been correct it would have worked perfectly. I think I found the appropriate adapter for the T25 to T3 and it should only add 1" of offset (https://www.ebay.com/itm/1438197630...vX1ti5rHyxFa1i6DKbkN2ekY_fzPd_DLgBj7NeIhfWj1g)

The only thing that concerns me about this manifold is the inlet openings are a bit smaller and different shaped



Test fit of the HX30, I still need to re-clock everything once I figure out the adapter.


Port comparison

 

[SkiFreak]

The only thing that concerns me about this manifold is the inlet openings are a bit smaller and different shaped

That's what a die grinder is for...
Installing that manifold as it is now would significantly affect gas flow and increase turbulence, which would likely affect the power gains you are looking for.

I have ported many heads/manifolds over the years; it's not that hard, but it can take a bit of time. Just make sure you are monitoring the wall thicknesses.
If wall thickness was going to be an issue on the manifold, adding a spacer plate between the head and the manifold would be another option, as you could deal with the shape transfers in that. You may also have to change the studs for longer ones, but that's a pretty simple task.

If I were going down that route I would laser cut the holes in the spacer to match the manifold, then grind out the opposite side to match the holes in the head.

 

[SkiFreak]

I picked up this T3 to TD05 adapter off eBay

If that does not work, you could make an adapter from steel plate and some thick walled tubing, assuming that you have some fabricating skills.
I've done that before...

 

[aschafer14]

That's what a die grinder is for...
Installing that manifold as it is now would significantly affect gas flow and increase turbulence, which would likely affect the power gains you are looking for.

That comparison picture makes it look a lot worse than it actually is. Here is a picture of where the stock gasket lines up. The mounting flanges are over 5/8" thick so there is plenty of meat to grind in a smooth transition. Whatever flow restriction the inlet ports might add I should make up for on the outlet. The outlet port on the stock manifold is (1.88 sq-in) vs the industrial one (2.23 sq-in) and then it will open up even more going into the HX30 T3 Flange. (3.65 sq-in)
1.88 sq-in, 2.23 sq-in, 3.65 sq-in.

 

[aschafer14]

I am still racking my brain on how @JDMBrian mounted this. This is his photo and its definitely a Holset turbo on what looks like a stock manifold. There has to be a manifold out there somewhere with a T3 flange. He said early in his post that he had a 4D35T but I cant find anything when I search for a manifold for that motor.


I did find this image of a manifold on Brett's and it looks to be different than my stock manifold. Its listed as a 4D31T manifold which from what I have found would be the same TD05/TD06 bolt pattern. I reached out them to see if they could get me the measurements