RTV1100 Turbo question???????????????

[chuckbuck]

I'm still trying to solve my boost problem.

As I have posted on the before, I installed a new TD03-7G turbo on my RTV1100 and was only getting 3psi of boost at MAX full load on the engine. Several folks said i need more fuel.

I can't determine how to do this so, I have ordered a shop service manual to determine how to get more fuel but I'm still wondering if the trubo is the problem or part of the problem.


I have talked to Kubota tech folks in Georiga and Lodi Ca, posted on several forums and sill can get the info needed to get this project on the road. I know this forum has a lot of smarts and i would really appreciate your help on this project.

Mikeyd, You said you were getting 6.5 psi boost on your setup and I'm wondering if you were able to get more than 3 psi of boost when you first installed the turbo without any other modifications to the govener/pump/injectors?


Regards,
Chuck

 

[Old Coot]

Sure wish I could help you. I never tried to put one on a diesel.
I put one on a 65 Mustang in the 70's. Seems no one I could find out about had ever tried it in that confined space. Finally got it going. You will to.

 

[chuckbuck]

Sure wish I could help you. I never tried to put one on a diesel.
I put one on a 65 Mustang in the 70's. Seems no one I could find out about had ever tried it in that confined space. Finally got it going. You will to.

I got the hard part done. Totally installed but it is only making 3psi boost. Tring to find out if it is the new trubo or i just need more fuel and how to get the fuel. The Kubota engine has a govener on it too.
Thanks, chuck

 

[john_bud]

What is the capacity of the turbo? Can it be that that kubota engine is just not producing enough exhaust to spin it hard enough to build boost? Is the piping sized right?

Getting more fuel is separate from the govenor. The fuel pump dictates the amount of fuel, the gov dictates the maximum rpm. On diesels the gov may be part of the fuel pump - don't know on this model. You need to talk to a fuel injection shop to determine how to turn up the fueling rate - normally it's pretty simple.

jb

 

[Old Coot]

What is the capacity of the turbo? Can it be that that kubota engine is just not producing enough exhaust to spin it hard enough to build boost? Is the piping sized right?

Getting more fuel is separate from the govenor. The fuel pump dictates the amount of fuel, the gov dictates the maximum rpm. On diesels the gov may be part of the fuel pump - don't know on this model. You need to talk to a fuel injection shop to determine how to turn up the fueling rate - normally it's pretty simple.

jb

I was wondering if the turbo is to big for the engine and like you said it doesn't produce enough exhuast to spin the big turbo fast enough to produce more then 3.5lbs. The piping is just as important as the size.

 

[chuckbuck]

What is the capacity of the turbo? Can it be that that kubota engine is just not producing enough exhaust to spin it hard enough to build boost? Is the piping sized right?
jb

The turbo is a Mitisubushi TD03-7G. It is suppose to be good for 800 to 1200cc engines. Mickyd used this turbo and was able to get 6.5psi of boost.

The inlet pipe to the turbo is 1.5 inches dia, same as stock and the exhaust outlet is 2.5 inches.

I did find out how to adjust the rack on the injector pump and was able to get the boost up to 4 psi. This was the most I could get by adjusting the rack.

Any suggestions would be appreciated,
Regards,
Chuck

 

[CarterKraft]

Is the turbo exactly the same as the other guys?

A slight trim differance will cause problems.

 

[CarterKraft]

After reading the other post, I think I have some TD03's and the ones I have are way to big for that engine, I think.

I would verify the compressor and turbine trims before going any further.

 

[chuckbuck]

I have posted some photos of my installation.

It was a simple installation and didn't take much fabrication. The turbo hot inlet is 1.5 inches and the exhaust is 2.5 inches. There is no muffler so there is no back pressure on the trubo. The turbo does a good job muffling the exhaust. It's slightly louder that stock. You can definately hear the turbo.

The turbo cold inlet is 2 inch and i used radiator hose. I was able to keep the air filter in the stock position. The trubo air exhaust into the engine is 1.5 inches.

I'm still only getting 4 psi of boost. My EGT is about 1100 deg F.

I have adjusted the injector pump rack and set the rpm to 3600.

Still tring to figure out how to get 6 to 7 psi boost.

Any suggestions would be appreciated.

Regards, Chuck

 

[chuckbuck]

Is the turbo exactly the same as the other guys?

A slight trim differance will cause problems.

As far as i know it is the same. TD03-7G.

What so you mean "A slight trim differance will cause problems"? What is trim and what problems can it cause?

Thanks, Chuck

 

[chuckbuck]

After reading the other post, I think I have some TD03's and the ones I have are way to big for that engine, I think.

I would verify the compressor and turbine trims before going any further.

How do i do this, " I would verify the compressor and turbine trims before going any further"?

 

[john_bud]

I re-read mickyd's thread. First thing he did was rebuild the turbo. Your's may be loose and not able to compress the air? Can you contact him and aske what he did?

jb

 

[chuckbuck]

I re-read mickyd's thread. First thing he did was rebuild the turbo. Your's may be loose and not able to compress the air? Can you contact him and aske what he did?

jb

My turbo was new, never used. Good idea to contact Mikeyd.
Thanks, Chuck

 

[Old Coot]

I'm only asking questions. It was so long ago that I forgot most of what I had to do. Hope I'm not being a pest.

You did a neat job of plumbing that in. Question, did you see the other guys installation? The reason I ask, when I installed one on the Mustang, they said I should keep the distance from the turbo to the intake as short as possible and try to keep from making 90 degree bends. That's been 30 years ago so it may be all different now. I realize you don't have much choice of how to get there, you very limited.

I'm wondering if he ran the exhaust over to the intake side.

 

[chuckbuck]

Question, did you see the other guys installation?

I'm wondering if he ran the exhaust over to the intake side.

Yes i look at the photos of the other installation.

I don't understand your question, "if he ran the exhaust over to the intake side"?

As i understand it's good to keep the distance from the manifold to the trrbo hot inlet short but the cold air out of the turbo is not too critical. In fact a lot of trubos have inner coolers which causing more restrictions.

Regards, Chuck

 

[Old Coot]

Yes I do know about keeping the exhaust hot. That is why you notice I had the exhaust pipes wrapped with insulation on the Mustang. And I agree they run the cold side through inner coolers now. But back then they didn't have intercoolers.
But it seems that every bend you put in causes more turbulance and a drop of pressure. I notice he only has two 90s on the pressure side.

If you seen his installation I would guess you tried to copy it best you could.

I was asking questions more then making suggestions. I'm learning from your work.

I should have said mount the turbo on the intake side.

 

[chuckbuck]

But it seems that every bend you put in causes more turbulance and a drop of pressure. I notice he only has two 90s on the pressure side.

I totally agree but i don't see how the extra bends i have in my setup could cause enough pressure drop to almost cut the pressure in half.

My installlation also has a 8 inch long straight pipe for the hot inlet side with no bends which should help offset any loss on the cold side.

I'm trying to figure out how to get more fuel. I can't get anything from Kubota since they are worried about emision laws.

The pump and injector shops don't seem very familiar with this engine.

Regards,
Chuck

 

[john_bud]

One question, have you calibrated the pressure gage? It would be sort of funny if your is reading low.

jb

 

[BrianW]

I think extra bends would increase the pressure, not decrease it. The reason you would want to avoid the bends is because it would decrease the volume (or flow).

 

[chuckbuck]

One question, have you calibrated the pressure gage? It would be sort of funny if your is reading low.

jb

Have not calibrated the gage, but have tried three different gages.