Have been thinking about this for a while. I have heard mention of it on another forum but it wasn't in a W140, I think it was in a W124 IIRC. At any rate, besides the fact that it's electronic control I'd like to hear what people think about putting the 5 spd auto trans behind the 3.4L TD engine.

This thought comes about because of two things, first, my auto trans needs work and secondly, a 722.508 is available to me from a wreck that was running. The OM603 runs about 2500rpm at 65mph and I don't think it needs to work that hard at road speed. The change in gearbox would knock rpm's down about 25%.

Let me hear your thoughts

Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

Do it.

I'd like to, it would be easier though if it was a 722.502 which is the non-electronic version of the same IIRC. That way I wouldn't have to add computer control for the transmission.

If anyone else has any insight I'd love to hear it.

Thanks
Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

It would be nice to hear more about this as you progress. Please keep us informed of what you find out.

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed

Do it.

I've considered taller gears to run the freeway, or a stick, but I like the launch I have and like the automatic. A 5-speed with lockup would be nice.

Driving the coach I run 1625rpm at 75mph, that's what I'd like to see on the 124.

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Gone to the dark side

- Jeff

I read all 722.5s need a controller. They bypass fourth gear without a controller.

There's a fellow in the Seattle area who makes a standalone controller for a 722.6 behind earlier engines. I think Diesels as well.

Sixto
87 300D

That would be good if we could put a 722.5 behind an OM617.95x...

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

You might be right sixto. My info for the .502 being hydraulic came from another forum so I'm not sure about accuracy.

That would be interesting too. I wonder how difficult it would be to integrate the MB controller for the 722.508 into the 140.134 chassis? That might be more trouble than it's worth. Any info on the stand alone 722.6 controller? Does he have a website?

Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

I would guess that it's just some solenoid... I would rig something up, with a switch or such on the the throttle linkage.

Steve/glenlloyd, check your PM.

Sixto
87 300D

I've been contemplating this idea. But I wonder how to make it stronger for potential increase in power.





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1983 123.133 California
- GreaseCar Veg System

Are you running some sort of genetically modified WVO?

Sixto
87 300D

Ha! Only if it was that easy!

Actually a super pump there might be in the cards.

http://www.superturbodiesel.com/std/cylinder-super-pump-testing-fitted-with-m75-floyd-t-1356.html




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1983 123.133 California
- GreaseCar Veg System