^^^^Gonna be a lot of tough to sell/cheap C5s and late model cars period out here.
So much for building my trucks 5.3 up. Shouldnt matter what you do long as it passes the sniffer.
Been going back/forth on a C5 but if it had to stay stock forever, cant even gear it? Nah.

The only thing that I have done is this in answer to your "Main" question:

Do you know of anyone that has had dyno tuning done to there C6 via 'HP Tuners' ever pass this latest California smog test after attempting a re-flash of the ECU with the stock GM tune ?

My Vette, 2009 4lt A6, was Dyno tuned with HP Tuners with a Cam, VARARAM CAI, Ported TB, Ported and Rodded manifold, Z06/ZR1 exhaust w/4 cats into 2.5" NPP mufflers, YANK 3200 Stall, Z06 3.42 rear to the Tune 452 RWHP and 421 RWTQ

I kept my "Stock" GM VIN E38 GM4 V8 (12628990) ECM tune from my 2009 in HP Tuners, which I had downloaded and saved as a file and named. I recently downloaded it back into the ECU after I finished my Project "Back to Stock", then on 8/13/2021 I took it to the SMOG shop and told my SMOG technician exactly why I was there and that I wanted to do the SMOG on the Vette in order to see if I will need to go to GM and have "Them" re-flash the ECU (PCM) to stock or not for California to see all the CVN (Checksum" numbers -

The outcome on Friday 8/13/2021 was a completed SMOG and full pass of all emissions including the ECU, CVN (Checksum) numbers -

This was with the "Stock GM Tune" saved in HP Tuners -

As far as it goes for LT's, Big Cams, Superchargers with custom tunes they will be in a totally different boat and will have decisions to make - either they will have to get a "Bootleg SMOG" or a "Bootleg/Illegal CVN (Checksum) Corrected ECU" :eek: :willy: - this I was not going to do or will not do, to me it's not worth it at all.

As you know I have made the decision to keep and drive my Vette with my currant mods and if I want a Supercharged Corvette again I will purchase a C7 ZR1 or Z06 (because it has the A8 Automatic) - if the C6 ZR1 was an Auto I would get one of those because I prefer the C6 much more over the C7's (IMHO :D )

Thanks,Matt

^ This is great news.
For the record CA BAR is claiming that if you have an EO# for the tune (DIablo, Hypertech) that hasn't been altered that it will be in their Checksum database and be considered legal. I haven't tested this.

The CVN calibration codes can be viewed on the following GM website.

https://cimg3.ibsrv.net/gimg/www.cor...58955ee1ee.jpg
OBTW - I never had any issue with modified ECM's I had tuned for the 8.1L engines in the RV's that I updated.

Yeah, hopefully so, because for A&A and Edelbrock it has not been the case and talking with Diablosport this morning they were unsure if their EO# will pass due to the way CA is testing and failing other EO# issued numbers.

It would be great if someone could test their Diablo EO# tune and see if it fails or passes.. Would help a lot of owners out and add valuable information to this and other threads that I will update.

Thanks,Matt

I’m curious how this works with a factory-modified car such as Callaway, Roush, etc. ?

Callaway has an EO To be able to sell the vehicles in California. It’s a zero starter in the conversation. Not a problem. I don’t know about the other company mentioned

Well said - Perhaps someone who has one and had to get SMOGGED will be able to comment on what happened when they went to get their SMOG done - any and all information will be helpful

Thanks,Matt

Tennessee is done Jan,14 2022 in all counties with the exception of Davidson (Nashville)

I would assume then, by what's been posted, that if the original Callaway tune has been altered it would then be flagged & put back to original? I have no intention to ever move to CA, just curious.

But, more importantly, what do the emissions tests entail in each state? Are they just sniffer tests or are they visual tests as well? I have no problem with efforts towards clean air. We all know modded cars can still be clean. My issue is with the draconian laws intended only to get you to give up your gas car by making it nearly impossible for you to register it. SEMA needs to get involved if they are not already.

I highly doubt they dive that deep into it but I could be wrong.

WOW Big article today on Yahoo explaining this whole thing. What a coincidence
.https://www.yahoo.com/autos/californ...183900978.html

Only Callaway would know on their tune (or more properly described, calibrations), which individually, are not reported To CARB. ;)

You're not wrong.

Just for reference, the only 2 counties in AZ requiring emission tests are Maricopa (Phoenix area) and Pima (Tucson area), however those who live outside those borders and work/commute inside, still need the tests.
Cars built within the last 5 model years are exempt, as are some that are older than 25 years and all prior to 1967. Extremely low production cars also get a pass, since the feds don't or can't get them in quantities to create standards. For those from out of state (new registration) or beyond the 5 year exemption, the testing is then only required every other year.
The test consists of plugging into the OBDII port to check for issues that would trigger a check engine light. Also a vapor test is done to verify the gas cap has no leaks.

If you have catless headers and you can tune out the rear sensors, you'll pass the test. Although if you're blowing blue smoke out the tailpipe or other obvious problems, like no OBDII port (pre 1996), they'll still do the sniffer test.

Fees are charged for the tests at the testing station ($17 IIRC) and registration/renewal can be done online or at numerous locations. Registration and other minor fees are $10.85. Vehicle license taxes are calculated on the Mfg's base price per model and are reduced every year by some percentage (10% IIRC)
For more info: servicearizona.com

Conservatives are welcome as new residents, but don't tell any liberals where you plan to move. :hide:

I would move to AZ if it weren’t so hot and if there weren’t nasty bugs and spiders.

In CA, when a vehicle fails a smog check, there is nothing that pinpoints the reason for failure. The MBRP would be an instant failure, which would be checked as "modified exhaust". Anything else, if it checks off the box on the computer, it fails.

No sw modified is the pin point . Stands for software modification says it right on your slip ….I do hope because some us have multiple carb serials for our car this will still mark them
as exempt in the system

I have this same question regarding this “checksum” business. 2 years ago I failed smog because I forgot I had a SCT handheld tune in the ECM. SCT told me to pack sand cause I was in California. So I had a tuner upload a OEM tune back in and at the time passed smog. Here we are two years later and nothing has been modified and now I’ve got a re-smog the car again. Is this checksum going to be a problem?