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| obd2 reader hard wire? http://hpbc.ca/viewtopic.php?f=19&t=2033 |
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| Author: | Andrew4ce [ March 14th, 2014, 2:25 pm ] |
| Post subject: | obd2 reader hard wire? |
Any electronic tech heads here? I would like to get RPM from an outboard to a smart phone track data app. There are dozens of apps... many work with obd2 readers for cars and track days. I was wondering if there is a way to use a bluetooth obd2 reader? Hard wire an RPM signal to the obd2 plug? Some poeple online say you can via pin 9, others say you can't. But the talk is all over my head to understand. haha. Need someone who can translate and what other connections might be required, power, ground, etc. Anyone here ever tried or understand this stuff? Pin 9 talk: http://forums.rennlist.com/rennforums/9 ... ignal.html OBD2 info: http://en.wikipedia.org/wiki/OBD-II_PIDs BT obd2 readers http://www.aliexpress.com/wholesale?Sea ... 0314102119 track day app: http://www.gps-laptimer.de/Home.html |
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| Author: | Tomcat [ March 14th, 2014, 4:36 pm ] |
| Post subject: | Re: obd2 reader hard wire? |
I can't offer any constructive input on the subject but would also be glad to hear options and opinions. Currently using a Qstarz BT-Q1000eX for GPS data acquisition on our race bike, no issues but I wouldn't recommend it for marine use as water might be an issue. Qstarz recently introduced a waterproof model, the 6000, probably pricey. |
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| Author: | DoktorC [ March 14th, 2014, 6:49 pm ] |
| Post subject: | Re: obd2 reader hard wire? |
If you knew for sure that all OBD2 have a dedicated wire for RPM than it wouldn't be to hard IF it happens to be the same format as what is output by your stator. The issue may be that the signal in the OBD2 system is processed by the ECU/ECM into something only read by the OBD2 reader...in which case you're effed. I know this was absolutely no help...but I like to see my own typing.. 
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| Author: | DoktorC [ March 14th, 2014, 7:31 pm ] |
| Post subject: | Re: obd2 reader hard wire? |
It looks like rpm isn't part of the required wires going to the plug but some cars have that dedicated wire (manufacturers choice). Could you do a test on your car? See if you can light up a tach with one of the optional pins on the plug... My gut feeling (not based on anything more than a hunch) is that the obd2 readers only read data not an actual tach pulse...but I honestly have no idea what I'm talking about.. |
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| Author: | idvette [ March 15th, 2014, 8:56 am ] |
| Post subject: | Re: obd2 reader hard wire? |
Pin 4 is ground, 16 is power, 9 is manufacturer's discretion. If the Porsche guys say they're getting rpm from 9, then that's what Porsche is using, but that doesn't nessecarily mean anyone else is, or anything plugging into the obd2 port is picking up on it besides that specific Porsche tool. If they even pick it up, I don't know. For scan tools and adapters, they get their info off the network, which is just data stream deciphered by the tool/adapter. You can't just throw an rpm signal into that circuit, it won't work. Now, there's always a way to do what you want, it's just a question of how far you want to take it lol... You could get a vehicle obd2 PCM, wire up power and ground, convert your 2 stroke rpm signal into something the PCM understands, then read that off the data line. You could also in theory use the PCM to accept cylinder head temps, water temps, charging voltages, etc and read those off the network. But if you're using an app you'd have all kinds of codes. Thinking as I'm typing here, of course there's going to be a few things the PCM will need to operate, depending on the build of the vehicle. I'd choose an early model obd2, less complicated. Again, depending on the chosen donor vehicle, there's a chance the PCM needs to see other modules in order to function, so you'd need to know operation of the PCM and it's network in order to determine if it's a good donor or not. Many signals can be duplicated with fixed resistors, as long as you know what the values are supposed to be. Complicated yet? lol.. I haven't had breakfast yet, so the mind's a little weak still. This is possible, and I hope there's other ways to go about it, this is just the first thought that came to me. http://en.m.wikipedia.org/wiki/OBD2 This is the link you should be looking at, describes pin outs and stuff. |
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