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+--- Thread: Working tacho from om605 CPS sensor? (/showthread.php?tid=6146)
Working tacho from om605 CPS sensor? - MrHope - 01-17-2015
anyone have a solution to get a aftermarket tach to work with the standard Crank sensor on the 605/606 ?
RE: Working tacho from om605 CPS sensor? - F.R.A.S - 01-18-2015
You gonna use it in a G right? How does the stock tacho get its signal? Most Mercedes diesel engines pick up on the starter ring, except the turbo 605/606. If you're lucky you can just mount the pickup on the starter ring and wire it to the stock tacho
To answer your question: I have no idea
(01-17-2015, 10:02 AM)MrHope anyone have a solution to get a aftermarket tach to work with the standard Crank sensor on the 605/606 ?
RE: Working tacho from om605 CPS sensor? - DiseaselWeasel - 01-18-2015
there must be a crank signal somewhere... Or you go the old fashioned way via the alternator
What signal does the tacho need???
RE: Working tacho from om605 CPS sensor? - mantahead - 01-18-2015
hi,
i fitted an alternator with W terminal on my om606, and wired it up to a large type r rev counter,but couldn't get it calibrated correctly,must need resistors or something as its designed to work of coil.
it was reading about 3k revs at idle.
RE: Working tacho from om605 CPS sensor? - MrHope - 01-18-2015
yes im supposed to have it in my Gwagen originally it has no tach .
but i have a tach from anotoher Gwagen but its from a 6 cylinder gasoline.
how many pulses does a 6 cyl gas engine on one rev ?
the 605 from w124 reads the starter teeth
the 605 from w202 reads from humps on backside of flywheel (5 humps)
im using an universal tach now that reads W-signal from gen, but im not sure i reads right...
what would the gasoline tach say about the 5 signals from CPS sensor?
RE: Working tacho from om605 CPS sensor? - F.R.A.S - 01-18-2015
I'm not sure how the petrol engines read rev. How ever if it's not by five "humps" you can just mimic the petrol way by a piece of 3mm sheet metal and any machine shop can mill the pattern out for you. A more or less stock solution is always the best
Don't do stainless or aluminum
Has to be magnetic.(01-18-2015, 04:22 PM)MrHope yes im supposed to have it in my Gwagen originally it has no tach .
but i have a tach from anotoher Gwagen but its from a 6 cylinder gasoline.
how many pulses does a 6 cyl gas engine on one rev ?
the 605 from w124 reads the starter teeth
the 605 from w202 reads from humps on backside of flywheel (5 humps)
im using an universal tach now that reads W-signal from gen, but im not sure i reads right...
what would the gasoline tach say about the 5 signals from CPS sensor?
RE: Working tacho from om605 CPS sensor? - mantahead - 05-10-2015
hi,
any luck with the tacho?
i found that starter ring sensor on an old n/a om606 engine i had, i drilled my engine in the car from underneath and fitted it in the same place.
i wired it up to the large type r tacho, it reads backways, 4500rpm at idle and goes to zero if you rev it, lol, any ideas anyone?
RE: Working tacho from om605 CPS sensor? - seanyt - 05-10-2015
Ive to do this on my own car. Ill plan on using a tacho amp circuit that will read the existing crank sensors and convert the VR signal into a pulse that my existing clock will use.
Original engine was a 6 cylinder petrol and the crank signal will still be going to my ecu.
The circuit im using is based off a w124 tacho amp. using an lm1815n chip and a few resistors and capacitors .
I actually need to build two of them so hopefully it works .
My om606 has 6 tabs on the flexplate so matchs what the clocks want to see per revolution.
RE: Working tacho from om605 CPS sensor? - mantahead - 05-10-2015
i am using an older flywheel so no humps on it
RE: Working tacho from om605 CPS sensor? - seanyt - 05-10-2015
Something from dakota digital would probably do the trick so.
RE: Working tacho from om605 CPS sensor? - MrHope - 05-10-2015
Mantahead:
im using a sensor that reads the flywheel ring gear.
My sensor has 2 wires , the brown one to GND and the other one to signal on tacho.
works fine! has to bee a diesel tacho ! that only goes to 6000rpm
RE: Working tacho from om605 CPS sensor? - raysorenson - 05-10-2015
(05-10-2015, 02:58 PM)seanyt Something from dakota digital would probably do the trick so.
This. They sell a VR sensor for flywheel teeth to work on the diesels. Drill a hole in bell housing, adjust sensor air gap.
RE: Working tacho from om605 CPS sensor? - mantahead - 05-12-2015
(05-10-2015, 04:03 PM)MrHope Mantahead:
im using a sensor that reads the flywheel ring gear.
My sensor has 2 wires , the brown one to GND and the other one to signal on tacho.
works fine! has to bee a diesel tacho ! that only goes to 6000rpm
hi mate,
im using original sensor of om606 n/a thats reads ring gear, wired the same way, only works back ways on tacho, tacho is large type r designed for petrol ignition coil
so that dakota digitial box would convert my alternator signal to work on my rev counter, it says 4 cylinder or 8 in their description, should that matter on my 6 cylinder?
RE: Working tacho from om605 CPS sensor? - raysorenson - 05-12-2015
Mantahead, this is the Dakota digital thing I was talking about.
http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=129/category_id=287/mode=prod/prd129.htm
RE: Working tacho from om605 CPS sensor? - mantahead - 05-15-2015
(05-12-2015, 06:06 PM)raysorenson Mantahead, this is the Dakota digital thing I was talking about.
http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=129/category_id=287/mode=prod/prd129.htm
cheers man