Begi-s, Emissions Time - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-12-2009, 08:38 AM   #1
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Default Begi-s, Emissions Time

Hey all,
Its time for my 94 miata to get emission tested as I live in Arizona. Right now the car has everything stock besides a begi-s kit. What is the easiest way to get this thing to pass that will require the least ammout of work? I have spoken with local people and they say to disconnect the fmu and turn off boost. Any other suggestions or ways that you guys have gotten yours to pass? I do have a stock exhaust and cat that I will be using.
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Jerry
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Old 03-12-2009, 10:30 AM   #2
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If you make no boost, and run the stock spark and fuel maps...why wouldn't it pass?
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Old 03-12-2009, 10:39 AM   #3
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see my sig.
i just passed, but barely. nox were a little high. you may pass "as/is"
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Old 03-12-2009, 01:22 PM   #4
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You should not even need to disconnect the FMU. Unless you have some engine codes. In that case, find out what they are and we can make appropriate changes/fixes. Good luck!
Stephanie
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Old 03-12-2009, 10:37 PM   #5
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Thanks for the input,

I took it to get tested today with a fresh oil change, new plugs, new wires, and that Gaurenteed pass stuff from autozone. It failed for HC (1.26 grams/mile pass is .8) And it also failed for CO (18.34 grams/mile pass is 12.0). My NOX was 1.18 and pass is 2.0 so I was way fine there.
So it seems like the car is running a bit rich?

I took it to this "emissions specialist" and he was saying that my cat coverter wasnt functioning because it wasnt getting hot enough and that the only way to get it to pass would to be header wrap my downpipe or move the cat closer. Don't think im gonna ever end up going back there.
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Old 03-13-2009, 11:34 AM   #6
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why not? he may be correct. Catalytic converters DO need to get up to temperature to become affective. i don't know if that is your problem, but there is a possibility.
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Old 03-13-2009, 12:37 PM   #7
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High CO almost always means you're too rich. High HC has several possible causes, but running rich such that the cat is overtaxed would be one of them.

As long as you drove the car for 10-15 minutes before getting it smogged, the cat and everything else should be up to temp. Don't bother with that heat wrap junk yet. Fix your fuel mixture first. You can worry about other stuff if you fail again.
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Old 03-13-2009, 04:19 PM   #8
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Ok thanks, Im gonna just start from scratch and retune the fmu setup to the settings given from Begi. Then ill test my luck again with the smog boys. Sadly the car doesnt have a wideband on it so theres not really a way for me to verify my af ratios are on.

Also I did drive the car for a while before I went in. Too bad you cant just buy an inspection sticker in my city ha.
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Old 03-13-2009, 04:32 PM   #9
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the dyno test should not put the car into boost at all, therefore there shouldn't be any need for the fmu to add fuel. something else is going on.....you sure everything is hooked up correctly?
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Old 03-13-2009, 06:40 PM   #10
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More details on the test procedure would be good. Here they just did idle/30 seconds at 2500 RPM (standing still, in neutral) and my car passed fine. Don't know how it would have done on rollers or whatever, though, if it was actually in boost for a significant part of the test.
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Old 03-16-2009, 10:52 PM   #11
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The test that they do in AZ is put it on a dyno. The guy that is testing your car has a curve that he has to rev your car to on a computer monitor, and also shift into certian gears. This was making my car go into boost.

Anyways my fuel mixtures were a bit rich, after retuning it to the settings from begi it did significantly better but still failed. So what I did to get it to pass was disconnect the wastegate actuator and turn off the fpr. Now im all set for 2 years.
Thanks for the help and thumbs up to the guys at begi for answering my dumb questions!
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