+- STD (https://www.superturbodiesel.com/std)
+-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6)
+--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7)
+--- Thread: cdi conversion (/showthread.php?tid=6451)
cdi conversion - Dieselsec - 04-19-2015
I'm planning on transplanting an om611 from a c220cdi I have. It's a w202. Body rotton.
I plan to swap it into a w126.
I understand the canbus is an ussue so i plan on swapping all electronics and associated wiring.
Question is- can I connect the 4 abs sensors from the w202 together and then connect/tap that into the one abs sensor wire on the w126 rear diff? To give the om611 ecu a speed signal? Would it work or confuse the ecu. Would it stop the abs working?
Any thoughts?
It's a manual om611.
RE: cdi conversion - AlanMcR - 04-19-2015
(04-19-2015, 01:11 PM)Dieselsec I'm planning on transplanting an om611 from a c220cdi I have. It's a w202. Body rotton.
I plan to swap it into a w126.
I understand the canbus is an ussue so i plan on swapping all electronics and associated wiring.
Question is- can I connect the 4 abs sensors from the w202 together and then connect/tap that into the one abs sensor wire on the w126 rear diff? To give the om611 ecu a speed signal? Would it work or confuse the ecu. Would it stop the abs working?
Any thoughts?
It's a manual om611.
That should work, though you might want to be sure that the pulse count per revolution is similar in both vehicles.
Does the ECU have any idea what gear the transmission is in?
RE: cdi conversion - Dieselsec - 04-20-2015
That is what I was thinking also but the only wires on the gearbox is for the reverse light so the ecu wouldn't know what gear it was in.
The pulse being sent from the w126 rear diff reluctor ring would tell the om611 ecu that there is wheel movement and also send the signal to the dash speedo.
Being a manual transmission I think it might work but would like to know for sure before undertaking the task transplanting everything and putting in a clutch pedal.
RE: cdi conversion - raysorenson - 04-20-2015
"can I connect the 4 abs sensors from the w202 together and then connect/tap that into the one abs sensor wire on the w126 rear diff?"
If the 202 uses active sensors, then no. If it uses passive sensors like the 126, AND the resistance of sensors is similar, then maybe but I doubt it.
"Would it work or confuse the ecu."
Assuming I'm wrong and works well enough that once you're rolling, the abs module is fooled, if the number of pulses per wheel rotation is significantly different than the W202, the engine ECU could be very mistaken about actual vehicle speed. This could lead to weird shift timing and possible speed limiter problems, incorrect trans ratio codes, limp mode, false abs activation etc....
"Would it stop the abs working?"
Assuming that it works well enough for you to drive down the road, and the speed of the single abs sensor drops at a rate fast enough to indicate impending lockup, the abs module will reduce braking at all 4 corners. You would essentially have single channel 4 wheel abs. I would not want to share the road with such a car, or at least, I would not want you behind me.
RE: cdi conversion - Dieselsec - 04-20-2015
Yes I've been thinking about the risk of involving the abs and decided to leave that alone.
I read a thread sometime back where a guy converted the 6 cylinder cdi into an older Merc. As far as I can remember he somehow spliced the relucter ring into the propshaft with the sensor pickup mounted very close. I've seen a similar set up in a boat. With all ecus and loom from a car. I will look into something similar.
I had also thought about using a 722.3 auto instead of the manual and using the speedo sender for the speed sensors but I guess it comes down to the resistance and whether they are passive sensors as raysorenson mentioned.
Maybe I should just put an om606 in it with mechanical injector pump.
RE: cdi conversion - raysorenson - 04-20-2015
Teh driveshaft reluctor sounds great. Use the stock sensor, or sensors from the 202 and keep the original abs system functioning. You could also mount reluctors to the axles.
RE: cdi conversion - Dieselsec - 04-20-2015
@raysorenson, do you think it would be possible to splice the 4 wheel speed sensor wires into one sensor?
There was a Jaguar xjs on ebay a few years back with the om611 fitted and manual gearbox. He transplanted all wiring, key, ecu's and the dash etc. Apparently it worked well and pulled great but the snag being it wouldn't rev past 3k revs but he couldn't figure out why.
RE: cdi conversion - raysorenson - 04-20-2015
That's uncharted territory for me.
I did work on an F350 recently that had 2 out of 3 failed ABS speed sensors, the one in the diff and one of the fronts. Bosch ABS. It set P0500 vehicle speed sensor DTC in the PCM (engine ECU). The trans did shift fine, but this powertrain can use the output shaft speed sensor (OSS) in lieu of the networked ABS speed signal in failure mode. My assumption is that once the abs module lost 2 of 3 sensors it quit sending a speed sensor signal over the network.
If you had a test vehicle, you could just unplug a number of sensors and observe behavior.
RE: cdi conversion - barrote - 04-20-2015
come on , the abs sytem in many of those cars are from 70thies like the 123series. and the same as the 202.
some cars like the 202 have the active braking device wich is not part of the abs, and it will brake anyway.
if u want to have ABS u got to have 3 sensors at least that´s what those 123 have. 2 in the front wheels and one at diff.
CDI engines in the 202, are not the same as the 203 where the system is integrated.
remembre 202´s cdi is just a upgrade in motorization. totally diff from 203.
RE: cdi conversion - Dieselsec - 04-20-2015
Ah yes good point. I can drive the car on a private lane. I'll unplug some of the electrics one by one and test drive it each time, and see what it will work without.
RE: cdi conversion - Dieselsec - 04-05-2016
So I eventually got around to converting the cdi om611 with manual trans.
One thing Is for sure, there is one hell of a lot of wiring.
The engine is limited to 4200 rpm as there is no speed signal from the wheel speed sensors. I have been in contact with some remappers that reckon this can be hacked to give full revs. To be honest, with the manual trans, 4k seems sufficient for now.
Also I don't have a speedo without said signal input.
I transfered every last wire and box/relay as I wasn't sure what it needed to run but if I was to do it again I would strip out most of it.
Would like to see more threads on the cdi engines conversions particularly the om613. I am planning a om613 with manual trans for my next project using stock ecu but I want to remove every last piece of the loom that isn't needed (if I can figure out what that is).
With a remap should put out some nice power.
RE: cdi conversion - starynovy - 04-06-2016
Since 320CDI comunicates on CAN bus it needs every other ECU to give good starting message. Not so easy as this.