V2403-M-T Turbo Replacement

[Dr. Fun]

I am replacing the turbo on my MX5100 (it has a V2403-M-T engine).

That normally wouldn't be a big deal, except I am putting a different model turbo on it than what came stock.

It came with an IHI turbo RHF3 18 545H. The Kubota part number is 1J854-17012.

The replacement is a Mitsubishi TD03 07G. The Kubota part number is 1A068-17011.

I can find little info on the Mitsu turbo other than it is made for a V2403-M-T engine and was possibly intended for industrial use instead of an ag tractor.

Both the impeller and turbine of the new turbo have more blades than the old turbo.

So, I have a couple of things to think about:

1. The new turbo might make more or less boost.
2. The wastegate PSI might be lower or higher on the new turbo.

What are your thoughts on the ramifications of those two items?

I am thinking, more boost, no problem. Less boost, possible overheating due to over-fueling. I should see more black smoke though.

I am contemplating adding a thermocouple post turbo just to get an idea of where temperatures are at.

Your thoughts?

 

[BotaDriver]

Check to see if this turbo is on other models. The v2403 engine is popular and in many models. It can make up to 62hp safely by swapping the turbo and adding some fuel. You will find the engine in the Grand L models making more HP with only the turbo assembly differing.

I highly doubt you'll see less boost considering the 5100 already has the smallest turbo I know of for that engine. The mx4700 has the same engine less the turbo.

 

[kuboman]

I would put on a boost gauge for a while just so you can see where things are at. Most turbos for these smaller engines set the boost in the 7 psi range. I doubt it will be much over that. Too high of boost is dangerous for these engines but I think you are safe up to 10-11psi.

 

[Dr. Fun]

Check to see if this turbo is on other models.

That is what is odd - I cannot find that part number (1A068-17011) used by anything Kubota.

I would almost think it wasn't a Kubota part number except that it follows their general format.

 

[Dr. Fun]

I would put on a boost gauge for a while just so you can see where things are at. Most turbos for these smaller engines set the boost in the 7 psi range. I doubt it will be much over that. Too high of boost is dangerous for these engines but I think you are safe up to 10-11psi.

If would help if I knew what the normal boost for the V2403 MX5100 was.

I might be able to rig up something to test what PSI the wastegate activates on the old turbo, but I am not sure that would be that meaningful.

I have read that the wastegate on the TD03 (the new turbo) opens at 6 PSI. I have no idea if that info is accurate.

I might put a liquid filled pressure gauge on the intake and also a thermocouple post turbo.


The problem with all this monkeying around is that I need to be using the tractor Right Now. I am tempted to put the new turbo on and if it sounds good and isn't smoking under a load, just go with it.