![]() I don't have sufficient post count, apparently, to link to the sources for this information.but I'll add it when I do, I guess. I won't begin to take credit for the research that has been done on this topic, as that squarely belongs with someone else. ![]() To reprogram them would require extensive knowledge of not only fueling tables, but an extensive knowledge of how BMSK actually functions, how to access those functions, and very specific re-writes to both information tables and processes with in the programming. I'm sure that will get some push back, as the booster plug has a very strong following in many places, but the data has been collected.the Motronic ECU's are incredibly adaptable, and it takes a very specific strategy to trick them. From some of the description provided by BrenTuning on their reflash, it looks like they "get it", but it would be pretty interesting to compare their lambda and fuel targets at stock, immediately after reflash, and then again after a tank or two of fuel to see what the results settle out to be. A software rewrite would need to be thorough and extensive to several parameters in the function of the ECU to actually work. Guys pulling the chips out and just changing the fueling tables wont work, the ECU will tune it right on out. The only way to reliably enrich fueling on a BMSK ecu with an add on part is through lambda shifting with something like the innovative LC2, AF-XIED, RapidBike, etc. If the o2 sensors remain active and their function un-manipulated, there is no way to prevent the ECU from hitting it's specified lean fuel targets. The o2's function as the final say and gate keeper on how the ECU determines what to do with fueling. While the booster plug gets some pretty rave reviews, any time data has been collected it has been shown to do nothing. As you ride, the o2 sensors send a voltage signal that informs the ECU that indicates it is running rich, and the ECU will adjust out the booster plug's enrichment.basically, the ECU learns that it's fueling tables are off the mark for the targeted AFR at that reference temperature, and it fixes them. While yes, once first installed, it works short term.the ECU sees the lower temp, adds the ~6% fuel the boxer motors very much want, and it feels great. This, of course, is why booster plug/temp spoofers don't work beyond about a tank of fuel. There have even been people and companies in the past reflashing ECU's for BMSK BMW's in the past that had their tunes reset via the ECU's long term fuel trim process. After an hour of riding around at various points in closed loop, air fuel in open loop(WOT) was already back to 13.8:1. There have even been tests done where someone put on a booster plug and jacked up the fuel pressure and achieved an open loop air/fuel of something like 12.1:1. ![]() Data collected from the o2 sensors during closed loop operation is used as reference points for the ECU to determine or learn fuel enrichment that is then added to global fueling tables.if you put parts on the bike, within a couple hours of riding around, your fuel curve will be back to stock. The BMSK ECU targets points as lean 14.7:1 all the way to 80% throttle opening and even above 5,500 revs in some applications of the 1200 boxer motors (Both oil and water cooled) and will always "tune" back to these parameters regardless of exhaust, air filter, temp spoofer, or injector spoofer.īMSK will keep your fueling within stock spec almost exactly, even with the header on, by using a process called long term trim fuel trim. The problem isn't really being too lean with headers/catless, it's being too lean period. ![]()
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