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BMW 3-Series (E90 E92) Forum
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All COBB Tuning AccessPORT Flash for N54 335i Discussion Here
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01-29-2013, 05:32 PM | #6887 | |
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01-29-2013, 05:53 PM | #6888 | |
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Carl's main issues have to do with very high altitude and I've recently found some new things relating to that. At this point, its on the list. While I am concerned with offering these tables as they will almost certainly overspin the turbos, I'll get them added... I just don't have a date right now. To your other questions: (1)The FlexFuel sensor is a bit more than just adding an input to the DME. Its possible that this could come at some point, but if we simply feed the signal to the DME, we would need to do massive changes to pretty much every piece of logic. The code simply doesn't exist in stock form from BMW, which means it would need to be written. (2)Changing the strategy of the DME to be boost targeting would again be a huge undertaking and would require extensive testing. I see this as being unlikely, but I won't completely rule it out. (3)External WGs are still on the horizon, but with the new options that have been surfacing lately, we should be able to do some testing on this front soon. I always have a long list of tasks, but don't worry guys, I'll get to them all. -Josh |
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01-29-2013, 06:00 PM | #6889 | |
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#2 would be a nice-to-have but not a deal-breaker, and #1 kinda the same. If modified fuel hardware comes out allowing us to just run 100% E85, that'd be fine too. Thanks for replying |
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01-29-2013, 06:08 PM | #6890 | |
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-Josh |
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01-29-2013, 07:59 PM | #6891 | ||
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01-29-2013, 08:19 PM | #6892 | |
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I believe the PID tables are there as a means of allowing the DME to take elevation, weather, component wear etc... into account. However, it takes so long for the DME to finally settle down that it's kind of hard to know what it can or can't account for. I just try to get the base tables as close as I can and hope that the PID tables will take care of it when conditions change. I've been waiting for the weather to clear so I can try out some things with the PID tables but it's just not happening. Either it's raining/snowing or it's so cold(and bald tires) that I break sideways when trying to grab a 3rd gear log.
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01-30-2013, 05:04 AM | #6894 | |
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correction = p*E + i*I(E) +d*D(E) Here I(E) is the integral of the error signal history and D(E) is the derivative. In a digital controller I(E) is just a sum of some past series of E's and D is the difference. In an analog PID these are tuned with various resistors, capacitors, & inductors. This is one of the most basic and sometimes very effective controllers out there, the parameters completely determine its behavior. The learning you may be sensing is coming from somewhere else. The Cobb ATR is letting you set p, i, d. There are consequences to each, I suggest you pick up a book on control theory and see what they are. As you crank up the gain on these things they can seem to perform better but if there are unmodelled dynamics in the system (there are) you can get some unpleasant side effects or wear out mechanical components. Anyway I am sure there are adaptations and learning going on in the system but not as a result of the PID itself. Perhaps the rest of the ECU is adapting to the new PID settings, who knows. edit: more reading here http://en.wikipedia.org/wiki/PID_controller |
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01-30-2013, 03:41 PM | #6895 |
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Could someone help me out with these? p0041, p2099, p2c7e, p2c6a, p2c32, p2c2b. The car is on stage 2+fmic sports. Thanks in advance for those who will help!
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01-30-2013, 04:06 PM | #6896 | |
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P2099 - Post Catalyst Fuel Trim System Too Rich P2C7E - Post Catalyst 02 sensor trim control, Bank 1 P2C6A - Post Catalyst 02 sensors switched P2C32 - PreCat 02 sensor trim control, Bank 2 P2C2B - PreCat 02 sensor systemcheck, Bank 1 Looks like the O2 sensors got switched during a downpipe install. -Josh Last edited by COBB Tuning; 01-30-2013 at 04:47 PM.. |
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01-30-2013, 04:59 PM | #6897 | |
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But anyway, overspinning issues aside, won't this additional control also be useful for people trying to get rid of flatlined timing due to exceeding the boost target? |
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01-30-2013, 05:32 PM | #6898 | |
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01-30-2013, 06:08 PM | #6899 | ||
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01-30-2013, 06:11 PM | #6900 | |
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01-30-2013, 11:17 PM | #6901 | |
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01-31-2013, 07:53 AM | #6902 | |
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Like I said, shoot me an email if you have other concerns/questions/feedback. josh.dankel@cobbtuning.com -Josh |
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01-31-2013, 08:36 AM | #6903 | |
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01-31-2013, 08:43 AM | #6904 | |
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01-31-2013, 11:05 AM | #6905 | |
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-Josh Last edited by COBB Tuning; 01-31-2013 at 11:23 AM.. |
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01-31-2013, 11:17 AM | #6906 | |
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Limits Tables: Load Limit (Tuner Code Bank 1) ...and Bank 2... X axis labels all 7.00? Y-axis labels also seem wrong. Henry said it was odd but correct and came from the DME. That may be true, but it still makes no sense. I was hoping to get more of an explanation than that. |
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01-31-2013, 11:23 AM | #6907 | |
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-Josh |
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02-02-2013, 06:05 PM | #6908 |
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Did a 1/4mile test using cobb
i dont know how accurate is the 1/4 mile test on the cobb. But i just wanted you guys to see and tell me your opninion.
i am sorry if this is the wrong place to post. i am located in saudi arabia it wasnt my best lunch. i was on DS and i didnt remove traction control but the brand new good year asymmetric 2 are very grippy. 265/30/19 back and 235/35/19 front. i am on stage2+ sport with 95 RON or 93 octane. Its a shame we dont have 98 ron or 93 octane in saudi arabia vrsf DP, stett cai, vrsf IC. i took a pic of my cobb screen with the results.
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