Doc_Mello
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Hondata has a series of data logs showing long term harm that were linked in the threads from this video first posting
https://www.civicx.com/forum/threads/oh-no-not-another-bov-thread.57978/
That was my thinking also. Yes, I saw those graphs, but I'm not convinced that qualifies as sufficient longitudinal data for this question. I meant, like, 10K+ tuned miles with a BOV, and a 500 mile datalog of LTFTs. Plus, other metrics of 'the car not running right' WRT long-term harm, like plug fouling, or injectors failing prematurely. Again, I may have missed it, but I'm pretty sure no one's done such a thorough investigation.Lol yes, i've seen those. My natural question when I first saw those was how could they determine long term issues from early/mid 2017 (the dates of the hondata posts)? The first year of this platform was 2017, so released middle to late 2016.
I understand the reasoning completely...just curious how much damage can be caused after true long term usage (maybe 3+ years). The damage they refer could/would happen, is that after say... 2 years? 5 years? 10 years? Could someone put one on knowing they won't have the car for more than 5 years and not see an issue?
I think a thorough investigation on such a popular topic is warranted, something beyond 'Hondata showed two graphs of relatively short intervals of STFTs'. For example, here's the original link to those two graphs: http://hondata.com/forum/viewtopic.php?p=92218
X-axis: airflow meter, a metric presumably measured in seconds (as denoted by the /s)
Y-axis: short term fuel trims
- Control condition (no BOV): the average of the metering adjustments (as indicated by the blue line) hovers around 0 (where it should be)
- Experimental condition (w/ BOV): the average of the metering adjustments starts around -5, but returns to 0 in 22 seconds. I want to know the long-term potential for harm from those 22 seconds, not to mention the condition of the test. Was it one dyne pull? Or a regular driving datalog?
And another Q: it's my understanding that negative FTs = less fuel. So, wouldn't that mean that the engine is running lean, not rich, in those seconds of negative STFT? Still no bueno, sure, but a different story.
Again, I'd like to see more parameters, and more data. ...because I'm a data scientist. ?
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