A442/A343 gas to diesel with original TCU

[69rambler]

The new 80 series adapters we've been working on will be finished and installation will start this week.

The overall goal is a straightforward installation of common Isuzu and Cummins engines. I'm trying to figure out all options for controlling the electronic automatics. The possibility of retaining the original 442 TCU or 343 ECU to control the transmission is very appealing.

Has anyone had success using the gas TCU/ECU to control the gas transmission with a diesel engine?

Anyone care to speculate if modifying the transmission speed sensor outputs would deliver a result with good driveability?

 

[69rambler]

Not even a "can't do it"?

 

[roscoFJ73]

You probably need to talk with the owners who have done the conversion and had threads on the subject.
There was only a small number of them

 

[Fromage]

Not been done as far as I know. I think a full hydraulic A440F or A442F would be easier. Most of us are using the TCM that came matched to the engine we are swapping in. What adapter are you making and why if you don't have the trans figured out?

Cheers

JL

 

[djsixbillion]

I've got nothing really constructive to offer, but I'm interested in what you come up with, as it would simplify the conversion process quite a bit if the Toyota tranny could be retained. At least for the A343 though, it's my understanding that the ECU and TCU are one and the same, making it difficult to control the transmission on a "stand-alone" basis.

 

[69rambler]

There are a couple options for controlling the transmissions. No issue of whether it can be controlled, just whether a workaround can be formulated to retain the factory gas TCU/ECU control.

The adapters bolt Isuzu B and Cummins B engines directly to the A442 and A343. These are about to be installed. The A440 adapter will be made if there's anyone interested in buying one.

 

[Fromage]

What are you planning on using for a torque converter?

 

[69rambler]

What are you planning on using for a torque converter?

Going to see how the OE converter behaves.

 

[Kernal]

Maybe post up a thread or link to this thread in the 80 forum; got some photos of the adapters??

 

[Fromage]

Going to see how the OE converter behaves.

Well more power to you for trying this out, but the stock 1FZ converter is a lot smaller in diameter than the torque converters seen in the Fuso and NPR applications. Since they aren't terribly expensive maybe they would be a good way to go. Alternatively you can get the stall speed lowered and the converter tightened up by a specialist shop, it might help it work more efficiently at lower RPMs.

 

[69rambler]

Well more power to you for trying this out, but the stock 1FZ converter is a lot smaller in diameter than the torque converters seen in the Fuso and NPR applications. Since they aren't terribly expensive maybe they would be a good way to go. Alternatively you can get the stall speed lowered and the converter tightened up by a specialist shop, it might help it work more efficiently at lower RPMs.

There is a 1/2" difference in diameter from the Isuzu and Fuso A450-43LE diesel converters to the Toyota Landcruiser A442 and A343 converters.

I understand your concerns though.

 

[69rambler]

Would anyone know the WOT shift RPM for the 1FZ Landcruisers?

We may have a real solution.

 

[SSSUPRA]

I'm quite interested in seeing the outcome of your research as I'd like to retain an auto trans when I swap in a cummins but unless you guys prove otherwise I don't have faith in the toy trans living for any period of time behind a diesel. I've pretty much come to grips with the fact that I'm going to have to swap in a 5spd along with the diesel.

 

[69rambler]

I'm quite interested in seeing the outcome of your research as I'd like to retain an auto trans when I swap in a cummins but unless you guys prove otherwise I don't have faith in the toy trans living for any period of time behind a diesel. I've pretty much come to grips with the fact that I'm going to have to swap in a 5spd along with the diesel.

Getting a non-Toyota retrofit transmission to fit and function as a factory transmission does is a large challenge. We've been down that path several times, enough to really look forward to retaining the Aisin. Discovering the limitations of the Aisin automatics and figuring out what upgrades, if any, are needed to keep them alive is going to be part of this.

The Aisins have a pretty good reputation, hopefully they do the job as well behind a diesel with some power. We will find out soon enough.

 

[SSSUPRA]

I would love to keep the auto, not real crazy about the thought of using a compushift unit. What do you think it would take to adapt an NV4500 to the LC transfer case, assuming the auto isn't up to the task?

 

[69rambler]

The parts to put a 60 or 80 case behind an NV4500 are already available.

There seem to be more than a few who would like to keep their Landcruiser auto and go diesel. That's what this is about.

 

[SSSUPRA]

Really, I haven't been able to locate those adapters. Could you shoot me a pm with that info? I guess at this point I'm still weighing options but auto is my first choice as a 5spd would exclude my wife from driving the cruiser.

 

[SSSUPRA]

Maybe I'm slow but when I search their site for HF2A adapters they show nothing for the nv4500.

 

[ClemsonCruiser]

Maybe I'm slow but when I search their site for HF2A adapters they show nothing for the nv4500.

You are correct..... I am the one that is slow, sorry for the false hope

 

[SSSUPRA]

To get back on topic, Rambler how long do you think it will be before you make an adapter and are able to check a toy trans behind a diesel?