mx5

An update. With the ROM linked in the first post (supposedly OEM for my car model/year) I just passed smog. I don't know what the exact CVN is, between the EcuFlash (SSM) or CarSys (OBD2) showing different, but whatever it is the smog station OBD2 computer accepted it so the ROM is confirmed good for '05 OBKXT. Because covid I couldn't get closer to the display and film what the machine showed during testing.

The engine is converted from the original side feed injector setup to top feed /rails/TGV from a '08-'14 WRX. The OEM WRX blue top feed injectors are slightly bigger than the original OBK side feed ones, but the stock ROM compensates for that without triggering a check engine light/codes.

By the way I just noticed the smog database in the Pass/Fail column now has the code D if a car has failed the CalID/CVN check:

https://www.bar.ca.gov/pubwebquery/vehicle/pubtstqry.aspx

As for the CVN, how do you know exactly what data Subaru provided to CA? You dont.

Well, BAR posted that starting July 2020, they are pretty much checking all cars manufactured past 2000. Even if for whatever reason they don't have all CVN from the manufacturer for a specific model, it is quite easy for the machine to compare the CVN vs all other smogged cars of the same model across the state. If it is an unique one, it is obvious that something's going on and the machine will send you to a referee to look into what's going on. Keep in mind that they have been logging the CVN information from all smogged OBD2 cars for years, but just not acting on it. Now they just decided they logged enough data to recognize what's what.

Once they have the data and figure out how to manipulate the CVN, the state will have found a way to discover the change.

I guess they can do something with the new cars. But not much they can do with a smog station machine hooked to a 15-20 year old ECU which all id information it could report over OBD2 is Cal ID and CVN.

I just noticed that EcuFlash also shows CVN in the log when loading a ROM.

And for that same stock ROM it shows "CVN: 0091BE32"

That is puzzling - a totally different number than the CarSys output.

My car's an LGT but I'm running A2WC522S. I can take a peek, though car's not stock.

My car is not stock either. But the smog check machine needs to see calibration ID and CVN it is expecting

I wish in the OBD-II section along "Force Pass Readiness Monitors" field there was a "Force CVN" one too so I didn't have to take out the ID1050x

The new software in the smog test stations in California started checking the CVN (Calibration Verification Number) and send you to the smog referee if it doesn't match the ones by the manufacturer or if you're running an unique one (compares vs what the machines read from other cars of the same model across the state)

So I started looking towards converting my car to run the stock calibration.

It is a manual '05 OBKXT (A2WC522S)

Then I got the stock ROM for my car from here and flashed it with Tactrix OP 2/EcuFlash :

http://www.romraider.com/forum/download/file.php?id=5114

To check the CVN I used a regular ELM327 reader - OBD2 (and not SSM) to be as close the way the smog station is pulling the info as possible.

For software I tried Torque first, but the only smog/calibration info it was showing was the emissions readiness.

I searched further and another suggested app for the ELM327 was CarSys.

So I ran it and for my current custom ROM it listed this as the CVN:

21DE1D8C94B81CC1

Anyone else with same gen car & running stock software willing to check and post their CVN to compare? Any other programs which show CVN?

I am converting the engine of my '05 OBKXT from side feed to top-feed injectors (boost is going up soon so I need bigger injectors)

I am using the TGV and OEM fuel rails from a later engine.

While browsing the part numbers I noticed that for the early cars (like mine with the side feed injectors) the parts listing for the gasket between the TGV and the head is 16272AA001 and is called insulator.

For later LegacyGT/OBKXT (with the top feed injectors) the gasket is listed as 14035AA421.

Any idea why Subaru switched to these thinner gaskets?

I got a new pair of each to compare and 16272AA001 are much thicker pieces and have lots of rubber on both sides. The shape is identical thus both types look interchangeable. I would imagine the thicker ones with the rubber might keep the engine heat off the TGV/intake manifold better.

So ... with the top-feed TGV should I use the thinner gasket or keep my original thicker insulator style? I am currently swayed more towards keeping the thicker one, but have there been issues with those for the change?