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Old Sun, Sep-30-2018, 09:49:26 PM   #1
inferno493
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Default A simple question

I have a Dinan-tuned supercharged M3 that won't pass inspection as the sensors don't all post up for the obd2 test run at the DMV. Looking beyond the massive learning curve and tremendous volumes of information I will need to digest, will I be likely to get my car past the inspection process by modifying the tune?
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Old Mon, Oct-01-2018, 03:40:24 PM   #2
geargrndr
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Default Re: A simple question

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Originally Posted by inferno493 View Post
I have a Dinan-tuned supercharged M3 that won't pass inspection as the sensors don't all post up for the obd2 test run at the DMV. Looking beyond the massive learning curve and tremendous volumes of information I will need to digest, will I be likely to get my car past the inspection process by modifying the tune?
Depends. Where exactly do you live?
(motherfrackers need to put their actual goddam cars and actual places of living in their damn profiles dammit... #crankyoldmancomplaints )

If the inspection process in your state is purely "no engine light, no OBD emissions codes"... then sure - it is fairly simple to turn off the troublesome "DTC's" (error codes) in the tune.

If your state (or county, since some states are ballbusters in some counties and 'ZFG' in other counties...) has more sophisticated computer systems, then they may flag you if a DTC is disabled and appears as "Not Applicable/Available" when it is supposed to.

In my state, their computers are smart enough to read a DTC-disabled car and figure out crap like - for example - "Model Year = 2005" + "Secondary Air System = Not Installed" and say "WAAAAIIIITTT a minute - somethings wrong here, this car is REQUIRED to have that equipment..."

Then your car VIN gets flagged, and its permanently banned from an inspection until its taken to a state operated inspection facility (instead of your friendly local private inspection garage...) to be comprehensively analy-probed and fully examined to determine exactly how illegal is it, and what needs to be done to return it to 100% stock. And they will bust hard nuts on every little non-stock detail. Which is why you want to avoid getting flagged at all costs.
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Old Tue, Oct-02-2018, 04:46:10 PM   #3
inferno493
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Default Re: A simple question

I live in Oregon. OBD2 has to report all sensors as ready, then it runs a test on them. Failing doesn't have any repercussions, you just have to take the test again. I don't know what the test entails. When you fail they tell you to go drive around for a bit as that usually resets the sensors if you have had the battery disconnected or something similar.
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Old Thu, Oct-04-2018, 03:32:56 PM   #4
geargrndr
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Default Re: A simple question

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Originally Posted by inferno493 View Post
I live in Oregon. OBD2 has to report all sensors as ready, then it runs a test on them. Failing doesn't have any repercussions, you just have to take the test again. I don't know what the test entails. When you fail they tell you to go drive around for a bit as that usually resets the sensors if you have had the battery disconnected or something similar.
OK that's not exactly how it works - there's no test that the OBD scan actually actively triggers and runs... the diagnostic tests run all the time inside the ECU.

At the OBD, they just poll the computer for the latest/current results... The question is how stringent they are about what comes back. There's a list of "monitors" and each monitor returns either: "available/not-available" (which really means "installed/not-installed"), and, "ready/not-ready".

From looking at this:
https://www.oregon.gov/deq/Vehicle-I...t-Methods.aspx

I suspect its pretty lightweight.

They are probably just looking to see that the vehicle reports:
1. No emissions related errors
2. Any monitors that are marked "available" also = "ready"

Aka no validation of the 'available' list.

In some states you're allowed 1 monitor not ready or 1 error as long as its not blah blah blah but OR doesn't mention that.

So, given that you don't seem to have any danger of a 'flag' situation, and that maybe they don't validate equipment that should be on the car, you should be able to have someone disable the monitors that your car cannot set ready in your tune.

BMW did release an "emissions" software update years ago because the S54 was being a huge PITA about setting readiness. Getting it updated apparently fixes this and makes it set readiness much more easily. The problem with that IMO is that I think a lot of the tuners base their work on the pre-emissions-ready-fix tunes, so, tuned cars may be stuck with the 'fussy' readiness settings. I wouldn't be surprised if this is the case with your Dinan setup.

I was gonna look into the emissions update and see if I couldn't back some of those changes into my tune... but its a lotta work with little benefit...
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Old Fri, Oct-05-2018, 01:25:03 PM   #5
terraphantm
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Default Re: A simple question

Quote:
Originally Posted by geargrndr View Post


BMW did release an "emissions" software update years ago because the S54 was being a huge PITA about setting readiness. Getting it updated apparently fixes this and makes it set readiness much more easily. The problem with that IMO is that I think a lot of the tuners base their work on the pre-emissions-ready-fix tunes, so, tuned cars may be stuck with the 'fussy' readiness settings. I wouldn't be surprised if this is the case with your Dinan setup.

I was gonna look into the emissions update and see if I couldn't back some of those changes into my tune... but its a lotta work with little benefit...
The changes are in the program. The parameters didnít change (except layout changes when applicable). Most tuners seem to base their tunes on the latest program so I donít think thatís an issue. As far as I know, it addressed a communications issue rather than anything with the monitors.

One issue is that the CSL never got those program changes, so some people who are now running CSL management have issues getting their cars to talk to some emissions computers. One of my projects now is to try porting the changes over.
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Old Fri, Oct-05-2018, 02:36:35 PM   #6
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Default Re: A simple question

Hmmm. Interesting. That's not certainly how itd been explained to me... But I trust you over anybody else for sure. I can check the tuner flashes for a couple cars I know that suck at readiness and see if they are on the updated program or not... I know for sure one somewhat popular retail tuner does not use latest program, or at least doesn't update all the DME's they tune with latest program... which seems like would be the way to go...
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Old Tue, Oct-09-2018, 09:21:29 PM   #7
inferno493
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Default Re: A simple question

Thanks for the information. From what I remember the scan just makes sure that all of the monitors marked available are also ready. There may be some that must be present such as the O2 (which mine fails as it was replaced with a wideband AFM when the supercharger was installed).
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Discussing A simple question in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)