Turbos and Yanmars

[California]

I think some previous threads mentioned the SmartCar turbo. It is integral to an exhaust manifold (3 cylinder) so there would be a lot of machining involved, but I doubt they are very expensive used. I've seen them on Ebay.

 

[Bigkrank]

You can find the small turbos overseas mostly but the newer designs build boost so much faster than the old ones. We built at least 6 of them from older parts, but for what you are doing they would do little more than altittude compensation. A good turbo for your engine will run about $450 plus all the installation costs. I've seen a lot of people try and put turbos on these small engines for cheap and they mostly end up being for looks at tractor shows.

You could always pick up a turbo for a Yamaha Seca (?) motorcycle or similar and try it but most of these projects I've seen were time and money wasters and the guy would've been better of doing it right in the first place.

 

[dex3361]

You can find the small turbos overseas mostly but the newer designs build boost so much faster than the old ones. We built at least 6 of them from older parts, but for what you are doing they would do little more than altittude compensation. A good turbo for your engine will run about $450 plus all the installation costs. I've seen a lot of people try and put turbos on these small engines for cheap and they mostly end up being for looks at tractor shows.

You could always pick up a turbo for a Yamaha Seca (?) motorcycle or similar and try it but most of these projects I've seen were time and money wasters and the guy would've been better of doing it right in the first place.

I have 2 Kubotas(L4400 and a BX1500) I wonder do have to turn the pump pressure/volume up on the injector pump? If so where can I find details on tweaking the pump for use with a turbo?

 

[Bigkrank]

I have 2 Kubotas(L4400 and a BX1500) I wonder do have to turn the pump pressure/volume up on the injector pump? If so where can I find details on tweaking the pump for use with a turbo?

There should be a fuel rail limit screw that you can back out, you can get a manual for your engines off ebay or a place like Capital Engines 740-964-0089 and it shows it. You need the model # of your engine. We mostly only work on the D & V series engines.

 

[oldgrayfellow]

There should be a fuel rail limit screw that you can back out, you can get a manual for your engines off ebay or a place like Capital Engines 740-964-0089 and it shows it. You need the model # of your engine. We mostly only work on the D & V series engines.

This is an important point-- that you must provide for increased fuel delivery or adding a turbo will do little or nothing. The whole reason turbos can increase power is that they allow you to fit more oxygen per cubic inch of delivery charge--but they can only increase power if you add more fuel to burn along with the increased air. For our (tractor) engines running at a relatively constant rpm during use, the simple approach of just dialing in a fixed increase of fuel delivery per rpm can make sense. For a gasoline engine in a car, this approach is too simplistic because there are other dynamic variables (ignition timing, avoiding detonation, non-direct relationship between engine rpm and fuel delivery, turbo lag avoidance, etc.)

For a tractor, you'll want to choose an rpm target level for normal use, and tailor your fuel delivery to be optimal at that rpm. The fuel may tend to be excess or deficient as you above or below that rpm, but it won't matter so much because you are looking to get power from the engine at the target rpm most of the time. How to determine the optimum fuel is another matter.
For a gas engine, it can be tuned by monitoring with an air/fuel ratio meter having a sensor in the exhaust manifold. There may be an analogous approach for a diesel, but i haven't looked into it. You could probably get reasonably close if you look at a compressor map for the turbo you're considering, then do the math to calculate the charge increase from your engine volume at the desired rpm to determine the required fuel increase for your turbo of choice.

 

[dustin3207]

is the fuel adjustment screw under a screw on metal cap off the front of the fuel pump or is it inside the pump?

 

[Car Doc]

My 3810D has a turbo on it but you would never know unless you had the hood up and saw it, I have never heard it I do know its free rotating and all.

One of these days I am tempted to tap into the box ahead of the intake and gage it for the heck of it otherwise it runs excellent so I presume its working I just cant hear it? fwtw

Steve

 

[Bigkrank]

is the fuel adjustment screw under a screw on metal cap off the front of the fuel pump or is it inside the pump?

It depends what model you have. Usually it's the one sticking up in front of the pump, not the one sticking out the front.

 

[California]

Don't you need to have it running on a dyno when you adjust that screw?

 

[dustin3207]

found it! the adjuster screw sticks out the front towards the fan.Turning it In slows the fuel and out gives more fuel correct? I went by the smoke produced on throttle up.