04-14-2021, 09:04 PM | #1 |
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Need help passing CA smog. Cat-less with BM3.
Hey all,
I've got myself in a bit of a rough situation. I misunderstood the by-annual smog rules on the CA DMV website and didn't realize I had to pass emissions this year. I've paid the registration, all I need to do is take the car to a "STAR certified SMOG station". However, earlier this year (like an idiot) I had a FBO kit (all VRSF) installed on my 2013 335i PWG N55. I'm running bootmod3 stage 2 E30 fuel with a cat-less downpipe. So although I have no check engine (Cell light), my o2 sensor reads "not ready" for obvious reasons. As far as I know, this is the one sensor I need to show "ready" to pass. My question is, do I really not have any other options than taking my car back to the shop and spend $$$ to make it stock in order to pass? I've reached out to some guys who claim they can "pass me" under the table, but they either say they can't help me or they quote me so high I might as well pay to put the OEM downpipe back on... I've read about a VRSF o2 simulator, but sounds like these are no longer around? I've read about using an o2 spacer, but I've heard mixed results, and like the sim, it wouldn't pass a visual test (unless I get lucky and they only test ODB). Oh and my car would still REEK of fuel LOL I've also read about doing a drive cycle with a higher E85 mix to somehow trigger readiness, (is this safe?) but again, I'm assuming even if this was true I'd still fail the visual (and common sense smell test) Really wishing I had a lift and tools of my own... If anyone has any local suggestions or services, I'm located in San Diego, CA 92122. ANY info is helpful info to me! Thanks |
04-15-2021, 03:22 AM | #2 |
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Path of least resistance is probably just swap your OEM DP back on and flash back to stock and relock to DME. CA now checks for tunes with the smog check, so your car MUST be on 100% OEM DME software or you will immediately fail and get state ref, regardless of emission monitors. The other mods shouldnt be a problem unless the place doing the smog is really strict. So you don't need to go back to stock... just OEM DP and stock tune. Minor labor for the DP really.
Ive been doing "under the table" sniffer tests on my other cars for 10+ years, but AFAIK you can't do that with the OB2, since it must be connected to the vehicle, so they cant "trick it" like a sniffer where they just put it in a different car's exhaust. The O2 simulators and spacers have mixed results. A spacer with a mini cat MAY get you emissions ready if you go back to stock tune and drive gently through the drive cycle, but as you said, the smell and visual would be an obvious fail. Some shops may overlook that as long as you pass the OBD2, potentially for a "extra fee". |
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04-15-2021, 07:35 AM | #3 |
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swap the pipe back.
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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04-19-2021, 02:10 PM | #4 |
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This is the downside of having a tuner shop do your installs. When it's time to pass smog, you'll need to pay up again. Last week, my car was due in CA. I had to put back the stock intake, stock CAT, and revert to stock software. Took about 2 hours, but fun to work on the car anyway.
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04-20-2021, 10:35 AM | #6 | |
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you either pay to get someone to pass you or you put it back to stock. it's standard California practice.
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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04-20-2021, 12:04 PM | #7 | |
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https://www.bar.ca.gov/ARSC/Newslett..._Modifications Yeah like i said, that's fine for the sniffer test (pre-OBD2), but doesn't work for these cars. |
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04-20-2021, 12:14 PM | #8 | |
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04-21-2021, 12:26 AM | #9 |
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Well, as you might have seen in the other recent emissions thread above, I put my stock DP back on in preparation for a test....and when it is done I will put the catless back on. Once ypu have done this job a couple times it's really not that hard--a little laborious with the position under the car, but doing it 2 times every 2 years..no big deal.
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04-21-2021, 11:42 AM | #10 | |
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06-13-2022, 11:21 PM | #11 | ||
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2015 335i 6sp manual with MPK and sport pack
GPlus intercooler and CP. Stage 1. CG precision dp. Staggered 19?s. 275/35/19, 245/40/19 ps4s. |
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06-14-2022, 05:38 AM | #12 |
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You searched for and replied to a post that hasn't been replied to in over a year.. just to say you're installing an exhaust? I mean.. thats cool.
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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06-14-2022, 08:13 AM | #13 |
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A set of rhino ramps and a fairly basic tool set (plus torx, and e-torx bits because BMW) could pretty quickly pay for themselves. I pulled my engine with the car on rhino ramps. No lift needed.
Torx/e-torx set I use: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 you could probably even get by with the 35-piece - as there's security and torx plus bits you wont need in the larger one Somethign like this would be a good start: https://www.amazon.com/EPAuto-Pieces...s%2C90&sr=1-28 Ramps: https://www.amazon.com/RhinoGear-119.../dp/B0117EETEK $130 and you can do almost everything you'd need to. Last edited by SuperLomi; 06-14-2022 at 08:21 AM.. |
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06-15-2022, 08:19 AM | #14 |
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For anyone looking for a little more info to understand the CVN, here's a demonstration:
https://f30.bimmerpost.com/forums/sh...5&postcount=25 |
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06-15-2022, 03:03 PM | #15 | |
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06-16-2022, 08:50 AM | #16 | |
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"How do they know I'm on a BM3 Stage 1 tune?!?!?" "They don't. They know you're not on a stock tune, so you fail." Also as far as smog goes, I wasn't aware that they started reading your VIN to detect modern "clean piping". I've heard stories of people skipping the smog shops and just paying off a DMV employee to update the system to say you passed. No idea if that's legit though. But for anyone on CA who wants a DP, keep your stock catalytic converter and plan for a swapping it in as a biannual cost of ownership. Getting flagged with a cheat device and being sent to a referee is going to be way more expensive than just passing legit. |
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06-16-2022, 12:49 PM | #17 | |
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