smog test with Bm3

2BitRoach · 01-07-2022, 12:36 PM

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

McGyv3r · 01-07-2022, 01:54 PM

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.

davidr3 · 01-07-2022, 03:42 PM

Quote:

Originally Posted by 2BitRoach

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.

Gen13 F36 · 01-07-2022, 05:33 PM

Quote:

Originally Posted by davidr3

Yeah just did mine. Flash back to stock lock the DME. Threw back on stock DP &did drive cycle and I passed.

Sticky this... 😂

DarkF30 · 01-08-2022, 03:01 PM

On a side note would bms stage 1 tune affect the smog at all?

muniz_ri · 01-08-2022, 03:34 PM

Quote:

Originally Posted by DarkF30

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.

Gen13 F36 · 01-08-2022, 05:36 PM

Quote:

Originally Posted by DarkF30

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

2BitRoach · 01-09-2022, 01:35 AM

Quote:

Originally Posted by davidr3

Quote:

Originally Posted by 2BitRoach

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.

eluded · 01-09-2022, 02:49 AM

People always laugh at me when I tip my smog guy.

davidr3 · 01-09-2022, 01:28 PM

Quote:

Originally Posted by eluded

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

eluded · 01-10-2022, 03:24 AM

Quote:

Originally Posted by davidr3

Quote:

Originally Posted by eluded

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

k3_b58 · 01-10-2022, 09:07 AM

Quote:

Originally Posted by muniz_ri

Quote:

Originally Posted by DarkF30

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?

muniz_ri · 01-10-2022, 10:57 AM

Quote:

Originally Posted by k3_b58

Quote:

Originally Posted by muniz_ri

Quote:

Originally Posted by DarkF30

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.

chuckles01 · 02-25-2022, 01:26 PM

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.

McGyv3r · 02-28-2022, 12:01 PM

Quote:

Originally Posted by chuckles01

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.

Danielknguyen · 03-09-2022, 04:37 PM

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.

BushF30 · 03-09-2022, 10:15 PM

Quote:

Originally Posted by McGyv3r

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?

McGyv3r · 03-10-2022, 11:05 AM

Quote:

Originally Posted by BushF30

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.

stuckyducky · 03-11-2022, 01:21 AM

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.

exE36M3 · 03-12-2022, 11:17 AM

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.

Gen13 F36 · 03-31-2022, 03:34 PM

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.

Doug435i · 04-01-2022, 02:06 PM

FYI. I passed CA Smog with Stage 1 BM3 and stock down pipe in January with no issues.

01-07-2022, 12:36 PM	#1
2BitRoach Enlisted Member 12 Rep 43 Posts Drives: 2016 328i f30 N26 Join Date: Jul 2020 Location: Los Angeles iTrader: (0)	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, 01:54 PM	#2
McGyv3r Second Lieutenant 169 Rep 256 Posts Drives: 1989 325i & 2014 335i Join Date: Jul 2021 Location: Philadelphia iTrader: (0) Garage List 2014 BMW 335i [0.00] 1989 BMW 325i [0.00]	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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01-08-2022, 03:01 PM	#5
DarkF30 Second Lieutenant 54 Rep 251 Posts Drives: F30 328i Join Date: Jun 2016 Location: Bay Area, CA iTrader: (1)	On a side note would bms stage 1 tune affect the smog at all?
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01-09-2022, 02:49 AM	#9
eluded 2JZ-GTE 3189 Rep 4,172 Posts Drives: 340 6MT, 50e, others Join Date: Nov 2015 Location: Sofia iTrader: (0)	People always laugh at me when I tip my smog guy. __________________ A man who views the world the same at 50 as he did at 20 has wasted 30 years of his life.
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02-25-2022, 01:26 PM	#14
chuckles01 First Lieutenant 190 Rep 380 Posts Drives: 2014 328i Sport, 6M Join Date: Jun 2013 Location: CA iTrader: (0)	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. __________________ -------- 2014 BMW 328i, 6-speed Prem / Nav / Drivers Assist / Heated Seats / Lighting
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03-09-2022, 04:37 PM	#16
Danielknguyen New Member 23 Rep 28 Posts Drives: BMW F31 Join Date: Apr 2019 Location: California iTrader: (0)	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.
	Appreciate 0 Quote

03-11-2022, 01:21 AM	#19
stuckyducky New Member 15 Rep 15 Posts Drives: 2014 BMW 320i X-Drive Join Date: Apr 2014 Location: San Francisco iTrader: (0)	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.
	Appreciate 1 exE36M3496.00 Quote

03-12-2022, 11:17 AM	#20
exE36M3 BMW CCA Member 496 Rep 808 Posts Drives: 2015 435i M Sport Join Date: Jan 2018 Location: NorCal iTrader: (4)	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.
	Appreciate 0 Quote

03-31-2022, 03:34 PM	#21
Gen13 F36 Brigadier General 1603 Rep 3,748 Posts Drives: 428i Gran Coupe Join Date: Nov 2017 Location: Los Angeles, CA iTrader: (1)	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.
	Appreciate 0 Quote

04-01-2022, 02:06 PM	#22
Doug435i New Member 4 Rep 9 Posts Drives: BMW 435i Join Date: Feb 2022 Location: Los Angeles, CA iTrader: (0)	FYI. I passed CA Smog with Stage 1 BM3 and stock down pipe in January with no issues.
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