Torque Split

[firstgenwagon]

Is there any way to fool the Automatic transmission into staying at a 50/50 torque split the whole time? Instead of the 90/10 or whatever it normally is. I've searched but couldn't find much on the subject, anyone have any experience with this? (This is on my 90 BJ)

Thanks!

[ciper]

Yes, you disconnect the electrical connection to the center differential. Be warned that you will wear the center diff and your tires out faster if you drive like this on tarmac and make tight turns.

The center differential is basically a motorcycle clutch with a hydraulic actuator. The TCU applies fluid pressure to open the clutch and prevents pressure to let them tighten up.

[firstgenwagon]

Where exactly would the connection be? Is it on the center diff itself? Is the center diff located closer to the tranny or rear axle? Is there any easy way to disconnect it, where I'd be able to re-connect it, or once it's disconnected thats it? This is my first AWD car, so it's all kinda new to me. (Been driving VWs since I got my license) Thanks!

[ericem]

You can do the 4x4 mod where you tap into the wire going to the drive solenoid c which controls the torque split.

[carsucharda]

well if you are looking for off road capabilities and rough innacurate shifting you could always just unplug the TCM. its also a good way to see if the front and rear diff are the same.

i would like to know what this 4x4 mod is though. ive been trying to find a way to get more of a 60/40 split out of my trans like the newer ones have in a straight line. i thought of swapping an ecm out of a 95 legg but i dont know if the connections are the same or if the wires are in the same spots. otherwise if there is a way to manually control the solenoid duty i would be more than willing to hear more about it.

[93forestpearl]

Well, if you used a scope to see what frequency and pulse width's the TCU sent to the duty C solenoid, that would be a start. Then you need to build some sort of other controller for it, which can be as simple or complex as you want to go.

Unless you get the reversed spool from BMS (who Rigoli goes to) for about $2500, you will never have a rear bias with an auto.

[legacy4ever]

I have the controller for the duty C solenoid, with a dial to change the duty ratio. An electronic guy made that one for me to cure the loss of AWD. As I fixed the AWD, I can get rid of that stuff.