[rfdesigner]

Help...

I should point out I'm a professional electronics enginner.. which gives me enough knowledge to be scared of what I want to do.

I have a 3.2l common rail diesel merc with an electronic auto box (computer controlled).

The auto box is set up to be both 'squishy' and 'revvy'

To run the engine efficiently I want to 'gear up and foot down' But with the auto if you put your foot down you get whiplash and end up in the middle of next week as the car launches.

In a perfect world I'd like to chuck the transmission control module in the bin and start again.. sadly the shear complexity of the the whole car means this would be a truely gargantuan project as I'd need to convince every other system that the gear box was origional.

I could probably get about 50% of potential gains by just over-riding the torque converter clutch (TCC), which won't lock until about 70mph in 5th.

Now I've done quite a bit of research on this , I have all the wiring diagrams and some of the operational docs on the 722.6 autobox. It seems that the system has checks, cross-checks and double cross checks for this.. I have found that it will throw a 'limp-home' code if I just over-ride the signal and make it engage the TCC.. meaning it would then fail to make any further gear changes until the car is turned off i.e. it would be stuck in 5th from the point I hit my over-ride switch if I press the button on the motorway.

(probably.. I haven't yet tried this, but the MB documentation is saying this will happen if it detects the TCC is locked when it thinks it shoudn't be.. I'm not 100% convinced it will know, but that's a whole other story)..

So... has anyone else here tried to convince an electronic auto box to do what they want it to?.. even if you failed.. it would add to the sum of knowledge.

Derek