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I have an AEM 0330 I'm about to put into a C7. It's going to stay there permanent. What I need to find is the best place to wire it in for power and the can network. I'm did some searching and saw a lot of folks using the OBD-2 port, but I'm looking for another location so I can leave that port open.
Has anyone found a good place to tap into the CAN bus under the hood or some other place that's convenient?
I can help you tap into the CAN bus (I've got the wiring books for the C7, and have done CAN injection on my M3) but I'm curious what that's going to accomplish. Is there a CAN module that comes with the wideband that knows how to talk CAN? I assume it must. But is there already support for the PID in the stock ECM for wideband code?
Or I guess my question is "to what end"? Who's going to CONSUME that CAN data that you inject into the bus?
It would be super-deluxe if you could buy a wideband, connect it to CAN, and the factory ECM knew and respected it and responded more thoroughly and accurately to mods, but that's a lot to dream for!
Yes, the AEM WB controller has a CAN module built into it that broadcasts the WB data over the CAN. I can't remember the arbitration ID off the top of my head. They also support a dual wb config (different arbitration IDs) with two of them so you could have one per bank.
Two reasons to do this:
1) Digital logging for tuning. I use HPTuners to log the wb without having to do the 0-5v analog with a ground offset. The refresh rates are much much higher too.
2) I reverse engineered a lot of other parameters on the CAN I use in a real-time telemetry setup while on track. I'd like to send WB data back to the pits.
Agreed it would be cool if the ECU could do something directly with that data. Perhaps HPT could build that into one of their custom OSs sometime so we could do closed loop power enrichment.
I'd greatly appreciate any wiring info you can share.
Did some research on this. I dont think the AEM 30-0300 will work. The Can data is specifically for the AEM datalogger. AEM does make a vehicle OBD2 Can based controller, but then you would want AEM 30-0334. My research shows the firmware in the gauges is the key difference between the units.
As for tap points, I know you will need a high and low tap. Best location????
I guess it depends on what you're trying to do with the data, but anything can broadcast messages on the CAN bus (within reason like rate, arbitration id, protocol). I've done this on other cars for a couple years, but I've not installed one permanently in a C7 before.
I'll post some info on this once I get it completed. I may use a 30-0333 which is the same except it has a gauge. I usually just put the 30-0300 in because I don't use the gauge in a temporary install. Since this one is permanent and I happen to have one laying around, I'm going to try it if I can find a decent place for the gauge.
Also found this.... Should be all the places where you can tap. For me, the Human Machine Interface is ideal as I am putting the gauge in the dash cubby.
2020 Corvette of the Year Finalist (track prepared)
C3 of Year Winner (track prepared) 2019
Why not use the 30-0334 with the pass-through OBD2? This allows you to datalog the wideband through your OBD2 for tuning. I'm confused at your end goal.
If that was directed to me.... I simply dont want a dongle plugged in all the time to the OBD2 port. That is the part number I bought, but Im going to hack apart the OBD2 interface portion and make my own harness. I will still be able to datalog the bus information for tuning with the MPIV2
Thanks atljar. I'm in that thread a few years ago as I beta tested the first of the 30-0300 from drmike. As he states in that thread, the only difference for the 0333 vs 0334 is the 0334 has an updated firmware that supports some other 3rd party scanners. This wouldn't affect anyone intending to use this with the gauge or with EFILive or HPT. The 0334 is just the updated single part number and supersedes the 0333.
I got the sensor installed tonight. The power is wired permanently along with the sensor wire itself, but I'm temporarily using the obd-2 connector for the CAN bus as I need to get some tuning done on this car. I have time to redo that side and may put the 0300 in it as I really don't want the gauge. Everything works as expected.
I have the same desire you do for the wiring. I think the HMI is a good choice too, especially if you want the gauge in the cubby. When I re-do this, I'm considering using the BCM in the rear of the car for my taps.
Good luck with yours and post pics when you're done!
Why not use the 30-0334 with the pass-through OBD2? This allows you to datalog the wideband through your OBD2 for tuning. I'm confused at your end goal.
I have mine(30-0334) permanently installed and just wired it into my port from behind. It can have a tendency to get bumped around or get knocked out of position. I got power from the front power port. Takes about 15 minutes to take off the panels and remove the shifter. Just use a T-Splice to get the power. I'm about to do a write up on a blower install that includes the WB (permanent) install.
Hey Ghostnotes.. didn't know if you were still around or not. So do you mean you basically cut off the OBDII passthrough and connected the two can bus wires directly to the wires that lined up with where they were at in the passthrough behind the stock OBDII connector?
That gauge has a pass thru connector you plug it in to your obd port and there is still a port to access for anything you need to plug in this was the easiest gauge to install and I have it logging on my hp tuners,
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That gauge has a pass thru connector you plug it in to your obd port and there is still a port to access for anything you need to plug in this was the easiest gauge to install and I have it logging on my hp tuners,
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Thanks man. It doesn’t stick out to much under the dash? Also.. where did you weld the bung or are you using the innovate bracket?
Bumping this thread ... how did you all route the sensor harness between the cabin & undercarriage for a wideband? Is there a location large enough to pass the sensor through (being that it's smaller than the other end containing the connector)?
12-12-2018, 04:23 PM
Wideband install AEM for CAN bus
