Adding a turbo to a TN65

[Wildcat Ranch]

Everybody here has been very helpful to me and I am very thankful for that.

My friend who gave me the turbo came by tonight to see what I had accomplished. We got to talking about fuel metering. He said that everyone he talked to that rebuilt injector pumps told him it can't be done.
Can anyone explain how this is done? What are we looking for on the injector pump?

I said I didn't plan on touching my injector pump but now I have to be careful. I'm getting all excited over the tuning that can be done! I can assure you that I will not touch the injector pump before I get my gauges.

 

[dieselgeek]

What altitude/elevation do you live at?

Also, I am *not* knowledgable about the injector pumps on your tractor, but in general on diesels with mechanical pumps, one pump design usually serves a range of engines with different HP levels.

For example, on a Cummins 6BT diesel (the old mechanically-pumped versions up to early 1998 models), it takes hardly anything to install a new "torque plate" or even pump up the base fuel pressure (with a screwdriver!) to increase fueling... both are simple and cheap mods, and the engine runs happily with them. Another possbile way to add fuel to the engine is to have the injectors modified for reduced opening pressure. This has the effect of allowing more fuel to pass into the prechamber but beware, it also has the effect of advancing ignition timing. Most people don't even think about ignition timing on a diesel, but it plays an important role in the power produced, and safety of the tune.

-scott

 

[dfkrug]

Looks great, WILDCAT!

Keep up the can-do DIY attitide.

This is not the first turbo-your-tractor thread on TBN.

I agree with others that you have to get a pressure guage so you can
tell what boost you are getting. That said, given your engine size, the
engine size of the Subaru, and your very low RPM (2500 or so), there is
a good chance you are only boosting a few PSI. A waste gate may not
even be necessary to keep boost at 7 or lower.

No one brought this up so I will. Your intake hose is buckling because it
is not designed for suction. Yet it has to handle the hi-temp of the turbo
housing. I found some single wire reinforced large diameter hi-temp hose
from a supplier of parts for large truck turbos. It worked well for a
custom twin turbo application I had.

Keep up the good work!

 

[Wildcat Ranch]

According to google earth, I am at 427'.

I was looking at the parts breakdown of the injector pump and was wondering if you could tell which adjustment it would be just by looking at the diagrams.

In picture #2, I can see #7 and #12 being adjustments.
In picture #3, There's #17.

Thanks again,
Dan

 

[Wildcat Ranch]

Your intake hose is buckling because it
is not designed for suction. Yet it has to handle the hi-temp of the turbo
housing.

It was buckling like that when I put it on. The tube starts to bend toward the intake manifold where I clamped the hose to the tube. When the motor is running, the tube doesn't buckle any more then what it is.

 

[IH3444]

Seems that I read a few years back that the TN70, and TN75 had 0.5 less compression, to account for the factory turbos. Such as 19 to 1 for the TN65, and 18.5 to 1 for the TN 70, 75. And yes it is also true for Volkswagen turboed engines. The pistons are different for the non-turbo, and the turbo units. It just wasn't a reduced compression either, it also had to do with piston top design. Hope it all works out for you. I would be a bit shy of doing it due to it's not a factory design for turboing. It may last a long time, but could heat the piston crowns up, and you could get erosion of the piston tops, ever so slight, but still occur at a very slow rate. You have gotten some good advice from many people, but taking such a great risk, well I was young once also...... If this is just a play toy, then you can afford to possibly hole thru a piston top. If you depend on this tractor for making a living.......well then if you decide to continue on, get the gauges, and pay close attention to what the turbo guys are saying. The very best to you and your project, the installation looks good.