Wire with Power only when the Engine is running/starting?

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Re: Wire with Power only when the Engine is running/starting

Postby tom_kauf » Mon Jun 19, 2017 12:24 pm

bigBADbenny wrote:Awesome but why not use ign2?

Yeah it is definitely is the preferred option to use IGN2. I have a day off today, since I worked Sat, so I'll have time to look into it :). I just wanted to clarify the circuit, even if I don't use it.
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Re: Wire with Power only when the Engine is running/starting

Postby RX25SE » Mon Jun 19, 2017 3:36 pm

The circuit you show will need a diode to stop the relays contact circuit from back feeding the vehicles crank circuit. This potentially means the engine will continue to crank when the key is moved back to the run position.

If you are worried about the load on the circuit supplying both the control coil and the device, use the relay in your diagram to drive the control circuit of a second relay. This second relays contact circuit can then draw from the battery to power the device.
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Re: Wire with Power only when the Engine is running/starting

Postby tom_kauf » Mon Jun 19, 2017 3:48 pm

RX25SE wrote:The circuit you show will need a diode to stop the relays contact circuit from back feeding the vehicles crank circuit. This potentially means the engine will continue to crank when the key is moved back to the run position.

If you are worried about the load on the circuit supplying both the control coil and the device, use the relay in your diagram to drive the control circuit of a second relay. This second relays contact circuit can then draw from the battery to power the device.


Ok, thank you for the advice.

Yeah, that's a very good idea.
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Re: Wire with Power only when the Engine is running/starting

Postby tom_kauf » Mon Jun 19, 2017 5:48 pm

bigBADbenny wrote:IGN2 is right there in the cabin fuse box, lowest row iirc:)

I checked again, and as I thought I saw last year, it unfortunately gets power with the Ignition on (engine still off).
There are two that have similar names in my car, 'IG2' and 'Unit IG2' (which is in the bottom row).

I'll look into some of the other ideas that have been brought up.
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Re: Wire with Power only when the Engine is running/starting

Postby bigBADbenny » Mon Jun 19, 2017 6:44 pm

I'll take a peek at mine too. The issue being you have a certain issue that's burning out the wbo2 sensors? Where exactly eg distance from turbo/exhaust port and angle of insertion, and dump type, in your car?
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Re: Wire with Power only when the Engine is running/starting

Postby tom_kauf » Mon Jun 19, 2017 10:44 pm

bigBADbenny wrote:I'll take a peek at mine too. The issue being you have a certain issue that's burning out the wbo2 sensors? Where exactly eg distance from turbo/exhaust port and angle of insertion, and dump type, in your car?

Great, thank you. Yes, I've burnt out the 1st one in about 9months and 10,000km. I was always careful not to leave the ignition on for long before starting the engine (to avoid shock cooling). But the day before my Sensor died, I was testing my new sub with the Ignition on for a while (then started the engine), and I suspect that's what killed it.

It's pretty close to the turbo (about 20cm), on the top of the dump pipe. It's a bit close, but that was the best spot for it, for accessibility and making sure it fits at all. I was concerned about heat, because the manual says at least 1m downstream, but others on Subaru forums haven't had any problems. Probably because the exhaust gases cool down in the up-pipe first, unlike NA cars where the distance from the exhaust manifold is more critical. And there is an error code that gets produced when the sensor overheats, and that has never come up on mine.
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Re: Wire with Power only when the Engine is running/starting

Postby bigBADbenny » Tue Jun 20, 2017 10:50 am

I'm going to research if anyone has had the same issue.
I know running the engine with the wbo2 "off" is a definite no no.
Running the wbo2 with the engine off is somewhat similar to calibration mode I guess...
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Re: Wire with Power only when the Engine is running/starting

Postby tom_kauf » Tue Jun 20, 2017 11:16 am

Ok cool. I know the Innovate Motorsports Sensors fail like there's no tomorrow (a quick google search confirmed this). They are Bosch Sensors, but maybe their heater is a bit less intelligent and doesn't ramp up slowly. Other brands seem to have a better control, but I'm stuck with this one for now.
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