seany260
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« Reply #15 on: April 16, 2015, 11:56:32 PM »
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Has anyone stopped to ponder why you're setting CWKONABG to 00 in the first place, or why non-SAI files have it set to 01?
To that I don't have an answer, I'm just following what I have read on the forum and s4 wiki. I must need to do more reading  |
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narf0815
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« Reply #16 on: April 16, 2015, 11:57:44 PM »
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S4 wiki says:
The first, and most popular sets the monitor to unsupported (falsely shown as PASSED in VCDS) by setting both of the following codewords to 0:
CDSLS
CWKONABG
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metronet
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« Reply #17 on: April 17, 2015, 08:15:15 AM »
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Has anyone stopped to ponder why you're setting CWKONABG to 00 in the first place, or why non-SAI files have it set to 01?
I was wondering the same thing. Isn't CWKONABG for Catalytic heating; set to 0 if you have no Cats? I am still confused about the lean & rich warm-up mentioned in the FR and if it has anything to do with the raised RPM or not |
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seany260
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« Reply #18 on: April 17, 2015, 09:41:09 AM »
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Im confused now after reading various posts, so im going to post up my setup.
I have my SAI pump and combi valve solinoid removed with vac pipe plugged off. Relays are still in place. The DTC that I have had is insufficient flow detected. I have 3" high flow cat and the rear o2 is still connected, for that I've had efficiency below threshold DTC.
Now I dont give a dam about readiness or heating the cat up quicker, or even the raised rpms at cold start if its really not needed, as long as the engine is heated up correct with the appropriate fueling. What ideally do I need to zero inorder just to stop codes without hintering fuel trims.
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seany260
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« Reply #19 on: April 27, 2015, 04:58:57 AM »
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To that I don't have an answer, I'm just following what I have read on the forum and s4 wiki. I must need to do more reading Update, now that I know, Set CWKONABG to 1 instead of 5. Tells the ECU that SAI is not installed, but cats are installed. Set CWKONABG to 0 tells ECU no SAI and no cats. And that's were i went wrong |
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nyet
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« Reply #20 on: April 27, 2015, 10:42:43 AM »
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Updated s4 wiki. Thanks.
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metronet
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« Reply #21 on: April 27, 2015, 08:24:04 PM »
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Update, now that I know,
Set CWKONABG to 1 instead of 5. Tells the ECU that SAI is not installed, but cats are installed. Set CWKONABG to 0 tells ECU no SAI and no cats.
And that's were i went wrong
Did you ever figure out why you had no raised rpm at cold start? I have been running CWKONABG=0 and my engine RPM is always raised at a cold start in the morning. Just curious to know what was the reason why your cold start strategy was disabled |
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MadCow
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« Reply #22 on: April 28, 2015, 10:26:39 AM »
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Not entirely sure if my problem is related to this, but I removed SAI, zeroed out MSLUB and sometimes on cold starts my exhaust gets ridiculously loud for a few minutes. It's all good for the first second or two, but when the RPMs settle it gets super loud. I haven't done any logging, but I have a feeling it's running really rich, maybe there's some VVT trickery going on too. This is on a wideband 1.8t with a test pipe. I can't be the only one experiencing this. I don't have anything to compare since I never ran this motor with SAI, but I think this happened when I still had a cat only it was much, much less noticeable.
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dimon_707
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« Reply #23 on: November 05, 2015, 01:17:25 PM »
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And nevertheless if to sum up the results, during removal of SAI and the catalyst that it is necessary to put in CWKONABG?
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ddillenger
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« Reply #24 on: November 05, 2015, 01:32:18 PM »
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Not entirely sure if my problem is related to this, but I removed SAI, zeroed out MSLUB and sometimes on cold starts my exhaust gets ridiculously loud for a few minutes. It's all good for the first second or two, but when the RPMs settle it gets super loud. I haven't done any logging, but I have a feeling it's running really rich, maybe there's some VVT trickery going on too. This is on a wideband 1.8t with a test pipe. I can't be the only one experiencing this. I don't have anything to compare since I never ran this motor with SAI, but I think this happened when I still had a cat only it was much, much less noticeable.
It's likely VVT. |
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
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Blackbeast
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« Reply #25 on: February 23, 2019, 03:58:20 AM »
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Sorry for grave digging, I just want to leave a summary here for future people who'll read it.
Basis value for CWKONABG is 0.
SAI: +4
Cat heating: +2
Cats installed: +1
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staffordshire
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« Reply #26 on: March 12, 2019, 11:02:27 AM »
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Sorry for grave digging, I just want to leave a summary here for future people who'll read it.
Basis value for CWKONABG is 0.
SAI: +4
Cat heating: +2
Cats installed: +1
Blackbeast thanks for sharing! after reading your post it became clear, Why one file had value 5 and one file had value 7 in CWKONABG Same engine but different build years.. |
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prj
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« Reply #27 on: March 13, 2019, 11:39:53 AM »
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Also "raised idle" - there is cat heating where it raises the idle on start, creates lots of overlap, makes ignition late and injects a bunch of fuel to get the cats hot faster.
This is done any time engine is considered cold, not specifically if it's actually very cold outside. So if you disable cat heating, you also "lose" (which is good for the engine and fuel consumption) this behavior.
After that idle is only higher if it's really neccessary, like if you are starting a car from really cold, as that is still in the ECU (usually - there are some where it isn't and you get cold start bogging issues with no cat heating, because they never calibrated it).
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nyet
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« Reply #28 on: March 13, 2019, 01:32:18 PM »
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prj what is your opinion on SAI with respect to cat heating in applications where we just don't care about cats at all?
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prj
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« Reply #29 on: March 13, 2019, 03:20:30 PM »
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prj what is your opinion on SAI with respect to cat heating in applications where we just don't care about cats at all?
I am not sure I fully understand the question. Cat heating works by retarding ignition, creating overlap and dumping fuel to increase the reaction rate of the cat and make it hot fast. SAI is added to make cat heating even faster. To dump even more fuel into the combustion chamber and then have the additional injected air from the SAI to help the reaction in the catalytic converter to make it hotter even faster. Dumping excess fuel into the engine on cold start washes the bores, increases ring wear and fouls the oil, so it is bad for the engine. Rapidly heating up the converter by increasing the reaction a lot isn't good for the converter either. The only reason this is done is so that the car can hit emission targets faster from cold start. Which is kinda funny because more fuel is expended doing it this way - it's a rebalancing of combustion gases. So if you don't care about that, I don't see any reason for any car to have it enabled or have cat heating enabled in the first place... Disabling cat heating will always reduce fuel consumption and be less harsh to the engine on cold start. |
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