Home Made O2 Sims?
Home Made O2 Sims? Seems like it would be possible to make your own O2 sims with some resistors or something. Has anybody done this that would like to share their experiance?
Re: Home Made O2 Sims? I thought about possibly useing an A-stable 555 timer circiut to simulate O2 switching but dropped the idea since I have edit. Has anyone ever looked at the output of an O2 simm w/ an O scope?
TECH Addict
Joined: Nov 2001
Posts: 2,207
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From: College Station, Tx
Re: Home Made O2 Sims? Yep, you are going to have to use a 555 circuit or something like that to give it a "swinging" signal. If it's not switching fast enough, etc. it will set a code also.
http://www.mkiv.com/techarticles/oxy...sor_simulator/
Might be a good circuit/starting point.
http://www.mkiv.com/techarticles/oxy...sor_simulator/
Might be a good circuit/starting point.
Re: Home Made O2 Sims? Excellent! Thanks, guys! I've put together many 555 timer circuits in the past, so I should be able to whip this one right out. I'll report my results back here when I'm done tweaking it.
Maybe I'm just a cheap bastard, but I can't see paying $90 for a pair of these units when I have piles of circuit components laying around waiting to be used. I won't have to buy anything if that ciruit will work.
Maybe I'm just a cheap bastard, but I can't see paying $90 for a pair of these units when I have piles of circuit components laying around waiting to be used. I won't have to buy anything if that ciruit will work.
TECH Junkie
Joined: Nov 2001
Posts: 3,604
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From: Los Angeles
Re: Home Made O2 Sims? Ive got a couple of homemade ones on my dining room table, along with a huge sack of GM connectors. I'll be selling them a lot cheaper than $90 a pair once I get finished testing them.
And yes, I used a 555 chip.
And yes, I used a 555 chip.
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Re: Home Made O2 Sims?
Mine toggle between 435mV and 735mV. I think the mimimum switch time is 3 cycles per second.
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you can disable them with tuning software easily today, compared to the post 6 years ago, also the EPA does not tollerate manufactures of "defeat devices" which the O2 simulator is guilty of, One could manufacture these easily, and sell them, but it would be foolish, especially with case law against you, using the caspers vs epa case.
http://www.epa.gov/compliance/resour...sper-fcsht.pdf
Ryan
http://www.epa.gov/compliance/resour...sper-fcsht.pdf
Ryan
There is still a company making these, they call them Signal Conditioners. PM me if you want, you can also drill out a spark plug non-fouler with a 1/2" drill bit and plug that in the pipe between the bung and the 02, it pulls the o2 sensor out of the exhaust stream.
I wonder whether just hooking B2S2 input to B1S1,
and B1S2 input to B2S1, might give you a sufficiently
different signal to fool the catalyst efficiency tests.
With only the cost of some wire & soldering.
and B1S2 input to B2S1, might give you a sufficiently
different signal to fool the catalyst efficiency tests.
With only the cost of some wire & soldering.
