4HI conversion, it works!

[twistedsymphony]

...
In order to have reliable 4hi, you need to generate the 88% (iirc) PWM signal that simulates the TOD computer's signal, and send that to the blue wire.
Google "DC Speed Controller" to get an idea of how PWM is used to control inductive devices like motors and clutches.

A few of us got a long way into figuring this out, and we pretty much had the solution on paper. Picture a knob, that allowed you to dial in the exact amount of torque you wanted to go to the front axles. Pretty cool.
However, no one really managed the jump from paper to reality for whatever reason.
...
Not finishing the TOD speed controller has been one of the greatest automotive letdowns of my life. I really wanted to finish this one up, if only to say it was done.
I still have all of the files though...

I don't mean to bump a long dead thread but I was just perusing through the archives and came across this.

I don't have my VX yet (put a deposit down, should only be another week or so) but I'm very interested in what you discovered here... I do LOTS with electronics in my spare time (I can show you some of my projects if you're interested). Creating a PWM signal is easy peasy... and you could probably even take it further than that with a little display to tell you the % rate you're sending or whatever...

I'd probably use an MCU to get the job done but there are other cheaper/easier methods if one were so inclined.

[Knigh7s]

I don't mean to bump a long dead thread but I was just perusing through the archives and came across this.

I don't have my VX yet (put a deposit down, should only be another week or so) but I'm very interested in what you discovered here... I do LOTS with electronics in my spare time (I can show you some of my projects if you're interested). Creating a PWM signal is easy peasy... and you could probably even take it further than that with a little display to tell you the % rate you're sending or whatever...

I'd probably use an MCU to get the job done but there are other cheaper/easier methods if one were so inclined.

you should check out this thread: http://vehicross.info/forums/showthr...ght=tod+switch .

The project died awhile back and then was revived again by Orion... We are all waiting for the results of his tests, but it looks pretty good so far...

Oh, welcome to the VX Fam! Looks like you are awaiting the addiction! LoL

[Greasemonkey]

True 4hi can only be obtained mechanically like the Trooper , Rodeo etc without TOD , even a VX with TOD has to have a mechanical lock to put it into 4lo this also locks the gearbox and non of the electronic clutches are working while you are in 4lo its all locked in place - and you will create transmission wind up if you are not on soft or slippery surfaces - unlike TOD which doesn't wind up - so the easiest way to obtain 50/50 drive is to fool the transfer case into telling the transmission its in low box then the TOD locks itself to 50/50 - surely this has been thought of but i just have not read it - everyone seems intent on rewiring the TOD - to achieve something which it does already - all it needs it the lo box lever sensor rewiring
cheers
Steve

[VehiGAZ]

Creating a PWM signal is easy peasy...

DO IT BROTHER!!! I'm dying for this mod. It'll be perfect for winter driving!

[taylorRichie]

DO IT BROTHER!!! I'm dying for this mod. It'll be perfect for winter driving!

I've already done it ...

I'm just wrapping another project before I can get the boards shot. I'll try to get a deadline set, and let you guys know.

We've already got the legwork done (THANKS MBEACH!!) and have done a proof of concept. We're even planning on controlling the TOD Christmas tree so you can see where you're at.

We'll all have this mod soon enough.