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Old 08-29-2007, 09:48 PM   #1
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Default Damnit ... Gotta smog already

I honestly dont know whats up with this because I swear I bought the car in April 2005 and it was smogged right then? I suppose it is just because the registration was renewed in November doh ...

So what sort of AFRs do i need to pass the sniffer test? I just installed a 3" exhaust system with a brand new catalytic converter so it shouldnt be too difficult to pass on the squirt. Im thinking up the idle to around 1k, run 14:1 for that, and then for the 15 and 25mph I believe they use 2nd gear and what sort of AFRs should I be targeting for those ranges? As for the visual, I am hoping that I can find a shop to just take it as is and I gotta get a hold of begi to send me my CARB sticker like today.

I am running the mspnp fuel and ignition map (I had to retard the boost timing a few degrees though) currently with good results overall
Anything else?
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Old 08-30-2007, 12:37 AM   #2
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I can't tell you how to make a standalone pass a sniffer test-- but I can tell you that catalytic converters are designed to do their job at 14.7:1, and if I were tuning a standalone equipped race car for best emissions (for eco-friendly racers maybe) I'd make sure it cruised at a steady 14.7:1 AFR, or as close as possible with EGO correction turned off. Then I might turn on EGO correction aiming for 14.7:1, with 1% steps, 5% authority, and steps maybe 150-200 msec apart.

Last edited by FoundSoul; 08-30-2007 at 12:47 AM.
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Old 08-30-2007, 12:44 AM   #3
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I was supposed to go for an emissions test by today.
Instead I paid the taxes and got a 15 day extension. Had other **** to do. :gay:

FWIW, taxes on the miata were only $25. By comparison our truck was $90 and MB which renews in Feb was around $200 last year.
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Old 08-30-2007, 12:53 AM   #4
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gotta love it. My smog check may well cost as much if not more than the $54 registration. Anyway, so I suppose I will be shooting for 14.7 then and I would be willing to bet that with my freshly rebuilt motor and that catalytic converter I have a bit of leeway as it is. I mean the old 1.6 with 24k and an old cat passed emissions alright so i have no doubt I can pass on megasquirt.
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Old 08-30-2007, 10:05 AM   #5
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I agree. A well tuned turbo car should pass w/o a problem, since passing the smog test would mean the car has a good tune. I'm assuming the standards become more lenient as the car gets older too (like GA) which gives a lot more tolerance for a 10+ yr. old car.
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Old 08-30-2007, 12:57 PM   #6
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There's a nice page somewhere (can't find it now) that goes over tuning the megasquirt for emissions. It says what changes to make to increase or reduce certain outputs. I seem to think one thing that was kind of a no-brainer was reducing timing a bit to increase EGTs. Also, general emissions advice, romp the hell out of the car before you drive up for the test, to get that cat nice and hot.

-Mike
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Old 08-30-2007, 04:20 PM   #7
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http://www.megamanual.com/v22manual/mtune.htm#emissions

Thats the link to the part of the megamanual that has information on tuning for emmisions.
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Old 08-30-2007, 05:38 PM   #8
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Quote:
Originally Posted by grippgoat View Post
There's a nice page somewhere (can't find it now) that goes over tuning the megasquirt for emissions. It says what changes to make to increase or reduce certain outputs. I seem to think one thing that was kind of a no-brainer was reducing timing a bit to increase EGTs. Also, general emissions advice, romp the hell out of the car before you drive up for the test, to get that cat nice and hot.

-Mike
And leave it idling in the parking lot until they are ready to test you... once you shut it off your fun time heating up drive is moot.
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Old 08-30-2007, 07:18 PM   #9
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Where in central california are you located?
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Old 08-30-2007, 07:39 PM   #10
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Im in turlock, 20miles south of modesto along 99

and I just read the megamanual writeup and I guess Ill be shooting for stoich and back the timing off a bit ... though I am not sure what the timing values are supposed to be with the miata ecu so that is something I will want to find out
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Old 08-30-2007, 08:13 PM   #11
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You are gonna pull your turbo to then damn that stuff sucks.
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Old 08-30-2007, 10:26 PM   #12
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GA has emissions testing?? Is that just a Hotlanta thing or..?
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Old 08-30-2007, 11:31 PM   #13
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akary, check Craigslist. You can find some smoking deals. I smogged my dad's car for $45 including submission to the state and certification ($10 by themselves). The guy's standard price on the wall was like $64 plus cert; CL price was $34, and he was the high-end. I saw several guys offering to do it for $34 cash certified.
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Old 08-30-2007, 11:41 PM   #14
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I was going to say come to the shop I go to, but you're wayyyyy to far for it to be worth it. The guy who runs it is VERY mod friendly (owns a modified Integra GSR). Big guy, I felt bad for him having to stuff his *** into my Corbeau Clubmans.
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Old 08-31-2007, 01:13 AM   #15
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Im going to run the car as it sits. It doesnt throw a code and Ill just stick the carb sticker on the thing. I got a cat and Ill just tune for 14.7 so it passes nicely.
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Old 08-31-2007, 01:45 AM   #16
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Quote:
Originally Posted by kotomile View Post
GA has emissions testing?? Is that just a Hotlanta thing or..?
13 metro counties: Cherokee, Clayton, Cobb, Coweta,
DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale County.

There is an out of area waiver to cover you military folks
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Old 08-31-2007, 01:52 AM   #17
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I hate DeKalb. Got a speeding ticket. Tried a month to pay it from TN via the telephone via their automated system. The system wouldn't let me pay my ticket, said it was a bad ticket number over and over and no one would answer the phone otherwise. Forgot about it about 3 weeks into trying. 5 weeks after the ticket i was headed back to Atl and decided to pay it. I was being held for contempt of court. The $75 ticket became $200.
F' Dekalb. It was the only highway around that area that was 65 mph instead of 80. Everyone was driving 75, i happened to be doing 80. Anyway, got busted, my mistake.
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Old 08-31-2007, 01:54 AM   #18
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dude the limit is 55 now
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Old 08-31-2007, 03:41 AM   #19
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woohoo! Finally an advantage to living in Richmond!
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