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      01-07-2022, 11:36 AM   #1
2BitRoach
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smog test with Bm3

anyone in California smog test yet and pass while flashing back to stock with bootmode? this new rule in CA regarding tuned cars will fail smog test. wondering if we'll pass with the stock tune flashed back just for the test
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      01-07-2022, 12:54 PM   #2
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Flash back to stock and lock the DME, this will pass the checksum. Do the drive cycle to set the reediness monitors, this will pass the monitors. Remove any mods that aren't legal in CA, that gets you to pass the visual.
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      01-07-2022, 02:42 PM   #3
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Quote:
Originally Posted by 2BitRoach View Post
anyone in California smog test yet and pass while flashing back to stock with bootmode? this new rule in CA regarding tuned cars will fail smog test. wondering if we'll pass with the stock tune flashed back just for the test
Yeah just did mine. Flash back to stock lock the DME. Threw back on stock DP &did drive cycle and I passed.
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      01-07-2022, 04:33 PM   #4
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Yeah just did mine. Flash back to stock lock the DME. Threw back on stock DP &did drive cycle and I passed.
Sticky this... 😂
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      01-08-2022, 02:01 PM   #5
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On a side note would bms stage 1 tune affect the smog at all?
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      01-08-2022, 02:34 PM   #6
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On a side note would bms stage 1 tune affect the smog at all?
I don't know but it's easy enough to unplug and avoid any hassle. I will be removing my JB+ just in case.
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      01-08-2022, 04:36 PM   #7
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On a side note would bms stage 1 tune affect the smog at all?
On the side note....why don't you try it and let us know
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      01-09-2022, 12:35 AM   #8
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Quote:
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Quote:
Originally Posted by 2BitRoach View Post
anyone in California smog test yet and pass while flashing back to stock with bootmode? this new rule in CA regarding tuned cars will fail smog test. wondering if we'll pass with the stock tune flashed back just for the test
Yeah just did mine. Flash back to stock lock the DME. Threw back on stock DP &did drive cycle and I passed.
awesome thanks for the info , glad you passed. yeah I'll have to put back my stock downpipe also.
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      01-09-2022, 01:49 AM   #9
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People always laugh at me when I tip my smog guy.
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      01-09-2022, 12:28 PM   #10
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People always laugh at me when I tip my smog guy.
I had a guy that would look past the DP & any other mods but im not sure if they can get by the monitors
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      01-10-2022, 02:24 AM   #11
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Quote:
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People always laugh at me when I tip my smog guy.
I had a guy that would look past the DP & any other mods but im not sure if they can get by the monitors
If the tip is big enough sometimes those details are overlooked
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      01-10-2022, 08:07 AM   #12
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Quote:
Originally Posted by muniz_ri View Post
Quote:
Originally Posted by DarkF30 View Post
On a side note would bms stage 1 tune affect the smog at all?
I don't know but it's easy enough to unplug and avoid any hassle. I will be removing my JB+ just in case.
Aren't they CARB legal?
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      01-10-2022, 09:57 AM   #13
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Quote:
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Quote:
Originally Posted by muniz_ri View Post
Quote:
Originally Posted by DarkF30 View Post
On a side note would bms stage 1 tune affect the smog at all?
I don't know but it's easy enough to unplug and avoid any hassle. I will be removing my JB+ just in case.
Aren't they CARB legal?
Not for the N20.
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      02-25-2022, 12:26 PM   #14
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Hopefully not a stupid question but anyone *not* flash back to stock and actually fail or get flagged? Now that this law has been implemented for a while, I'm just curious how thoroughly they do check, and whether this is more of a scare tactic or an actual crackdown on tunes.
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      02-28-2022, 11:01 AM   #15
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Quote:
Originally Posted by chuckles01 View Post
Hopefully not a stupid question but anyone *not* flash back to stock and actually fail or get flagged? Now that this law has been implemented for a while, I'm just curious how thoroughly they do check, and whether this is more of a scare tactic or an actual crackdown on tunes.
Yes. Someone on here flashed back to stock, but didn't lock the DME. They failed and were sent to a referee.

It's not a thing about being thorough, its about math and it's automatic. The checksum is just adding up all the 1's and 0's in the DME's code. Compare that value to a known good value. If your checksum is off, you fail. Any changes to the factory tune will change your value, so you fail.
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      03-09-2022, 03:37 PM   #16
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I just passed smog with MGFlasher flashed back to stock and relocked the ECM - did drive cycle in a day and was ready for smog the next. I left the Xhp Transmission tune active and had no issues.
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      03-09-2022, 09:15 PM   #17
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Quote:
Originally Posted by McGyv3r View Post
Yes. Someone on here flashed back to stock, but didn't lock the DME. They failed and were sent to a referee.

It's not a thing about being thorough, its about math and it's automatic. The checksum is just adding up all the 1's and 0's in the DME's code. Compare that value to a known good value. If your checksum is off, you fail. Any changes to the factory tune will change your value, so you fail.
dumb question, if i flash back to stock and lock the dme, do i have to get it the dme unlocked again or can i flash back the ots tune?
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      03-10-2022, 10:05 AM   #18
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Quote:
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dumb question, if i flash back to stock and lock the dme, do i have to get it the dme unlocked again or can i flash back the ots tune?
Yes, you will have to unlock it again before you can flash it with an OTS map. BM3 will lock/unlock the ECU for you.

Unlocking and tuning takes about 5 minutes. Re-flashing an unlocked DME takes about 2 min.
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      03-11-2022, 12:21 AM   #19
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Just smogged my car today with BM3 flashed back to stock for CA Smog.

I originally tried to pass off a high flow cat for a smog. The guy failed me like an a hole, told me my oxygen sensor isn't ready and collected $75 anyways. I returned back to stock, took it to another place my house in SF. I told him I returned the intake, downpipe, and ECU back to stock. It's flashed back to stock with a stock map and locked ECU. He gave me a lecture about how I should protect the environment. He did a "light" inspection and hooked it up to the computer. He said the Smog computer gave the green light within 10 minutes, but I should still do my part in keeping it stock.

So if you flash back to stock for BM3, LOCK the ECU after flashing back to stock and drive for at least 100+ miles for oxygen sensor to reset and other crap. I drove 400 miles.
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      03-12-2022, 10:17 AM   #20
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stuckyducky - thank you.
This is the simplest to follow BM3-smog-process I've read so far.
I got to do the same next year and I'm pretty much all stock and on stage-1.
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      03-31-2022, 02:34 PM   #21
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Amen!

You live in California, that is your reality. Just go back to stock every 2 yrs for smog. You don't like it then there are other 49 states to move too.

I use to pay $300 to pass an SR20DET powered Silvia. California life.
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      04-01-2022, 01:06 PM   #22
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FYI. I passed CA Smog with Stage 1 BM3 and stock down pipe in January with no issues.
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