545rfe shift point mods

[mike_nofx]

Originally Posted by gusthewonderslug

Gday all,
What's available to modify the shift points on my 2010 CRD, I'm pretty sure they had the Merc 545rfe box
Thanks

Just for reference, the 545rfe is a Chrysler box, not merc.

[kx steve]

Originally Posted by gusthewonderslug

Is there a mod to turn off the Od, eg so we can run with the Od turned off instead of turning it off when we drive off via the console switch.

would it work if you changed the switch to an on/off push button switch.

[Macca2801]

Originally Posted by kx steve

would it work if you changed the switch to an on/off push button switch.

No, as the switch is a sensor input to the computer not a traditional on/off switch.
I.e. You aren't actually switching anything on or off with the switch just pulling down or up a signal to the ecm.

When you power down anything that was done before i.e. OD on or off is reset and defaults to OD on until the ecm gets the sensor signal to switch OD off, if not its stay with OD on.

There were plans out there for a simple processor circuit that can be put in series with the sensor wire that waits for the vehicle to start and then cycles a signal through a relay to signal OD off without needing to push the button, i.e. Default to OD off.

Thought about doing it but have simply pushed the button each time I start the vehicle and only turn OD on if I'm unloaded and cruising above 100kmh.
Matt.

[samft]

Originally Posted by Macca2801

No, as the switch is a sensor input to the computer not a traditional on/off switch.
I.e. You aren't actually switching anything on or off with the switch just pulling down or up a signal to the ecm.

When you power down anything that was done before i.e. OD on or off is reset and defaults to OD on until the ecm gets the sensor signal to switch OD off, if not its stay with OD on.

There were plans out there for a simple processor circuit that can be put in series with the sensor wire that waits for the vehicle to start and then cycles a signal through a relay to signal OD off without needing to push the button, i.e. Default to OD off.

Thought about doing it but have simply pushed the button each time I start the vehicle and only turn OD on if I'm unloaded and cruising above 100kmh.
Matt.

Exactly, it would be a pretty simple piece of logic electronics I think.
I just use the button when i care.

although maybe there is another piece of electronics on the vehicle that sends a signal at the right time, like the stereo turning on, or auto door locking, or auto headlights etc. etc that you could splice into

I suggest you just learn to love that mushy accelerator feeling!

[gusthewonderslug]

Just had a Gus idea, could the switch be moved to the shifter knob, like the old sigmas used to have Od on Od off?

[samft]

Originally Posted by gusthewonderslug

Just had a Gus idea, could the switch be moved to the shifter knob, like the old sigmas used to have Od on Od off?

what benefit would this give?

[Tyvokka]

Torque management snip


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