CA/LA Smog

[Tbonem3]

I might be one soon enough

[Jimbo's M]

Sounds like something California would do.

Just one in a million reasons folks are flocking out of your "state".

[WOLFN8TR]

https://www.roadandtrack.com/news/a37022836/california-ecu-tune-during-smog-checks/

[Tbonem3]

Sounds like something California would do.

[usdmej]

I'm hoping that it does not perform the CVN check since there shouldn't be any manufacturer data to compare it to model years '07 and prior..

this is what baffles me, do they really plan on crowdsourcing ECU data from whoever comes in for smog checks and the most consistent reads become the new standard?

[skristedja]

The techs might not even know in the case of a pass. The tech will just run the BAR-OIS software and if it passes, the tech might not necessarily know whether a CVN check was performed by the software or not. I'm hoping that it does not perform the CVN check since there shouldn't be any manufacturer data to compare it to model years '07 and prior. If someone fails and it says it's because of the CVN, then we'll have our answer.

What I haven't been able to find is whether the BAR-OIS software will automatically record your CVN in the event that no manufacturer data was provided and use that as the baseline for future inspections. I don't believe so, but idk. Admin law is a bitch because they basically get to make their own rules and they're usually so poorly managed that you can't even find the rules that they feel like following.

[jet_dogg]

Sevan, ask your boy if there's any mention of year cutoffs specifically mentioned.

[siamkazi]

Did he say what years, any cut off?

This is the million dollar question....fingers crossed.

[Tbonem3]

Just got back from the smog place i usually go to. he said its going to get crazy starting monday. He showed me part of the new process he has to follow. Part of it involved reading the emissions sticker under the hood, which has the Test group number and the evaporative emissions family code written. He has to enter that into the system.

He also said theyre super going to be cracking down on looking for aftermarket cats or non CARB approved cats.

Obviously I passed this time.

Did he say what years, any cut off?

[thegenius46m]

It's calculated. Exactly how it's calculated isn't entirely clear to me. IIRC @gpetersen found that if you brute force the checksum such that the calculated checksum is equal to the stock value, then the CVN is also correct. So it's either itself a CRC16 (of each half) with a different initial value and/or polynomial, or it's some sort of calculation that's done to the calculated checksum.

Probably wouldn't be crazy difficult to hardcode the program to return a valid value

If we can disable CRC check and modify the CVN and Cal ID to that of virgin stock tune parameters, this will be easy to bypass by spoofing. I'm thinking just mirror all these checksum parameters in the tune file (pic below) from the reference tables in the mss54 master page to match a virgin tune then just roll up lol. If its possible this will create some insane demand. Think of all the manual swap cars on hacked tunes.

Only other option is to do what repoman suggested which would be to modify unused sections of the tune to adjust the checksum calculation to match the virgin cvn number.

[sev]

Just got back from the smog place i usually go to. he said its going to get crazy starting monday. He showed me part of the new process he has to follow. Part of it involved reading the emissions sticker under the hood, which has the Test group number and the evaporative emissions family code written. He has to enter that into the system.

He also said theyre super going to be cracking down on looking for aftermarket cats or non CARB approved cats.

Obviously I passed this time.

[Samsonite79]

It's calculated. Exactly how it's calculated isn't entirely clear to me. IIRC @gpetersen found that if you brute force the checksum such that the calculated checksum is equal to the stock value, then the CVN is also correct. So it's either itself a CRC16 (of each half) with a different initial value and/or polynomial, or it's some sort of calculation that's done to the calculated checksum.

Probably wouldn't be crazy difficult to hardcode the program to return a valid value

Maybe it's time for us to start a database/chart of what HW belongs to which SW, CAL, CVN so that we can reference back in case we do return to stock or "unmodified" software. This way, we can get an idea if we got the correct MODE 9 data for the california tree huggers... lol

So far I know this is real and true, which is for my MSS54 (non-hp):

for version 211322002801J469

SW ID: 7842975
CVN: 59D512B9

Cali ID: 7842974
CVN: 7DCC4B79

Program & CVN # can be found on https://nam3forum.com/forums/forum/s...me-information
but not the calibration/tune CVN#.

[ridebikes]

I just want to chime in to say thank you to all who posted here, and especially oceansize for that Evo forum link: https://www.evolutionm.net/forums/ge...se-help-2.html

Between reading both threads, I just cancelled a big round of upgrades. It's just not worth it anymore

It's a shame that most of these modified cars likely sniff as clean as any stock car, but the original intent behind all the laws has been so completely perverted to basically destroy the aftermarket tuning industry in CA. Sad.

[sev]

i better get my smog in before the 19th. sad too i dont have a tune. i just have a few tweaks

[shibui]

Goddamn this is some bullshit Sacramento