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Old September 16th, 2018, 06:02 AM   #41
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Originally Posted by appliance821 View Post
Ducati engineers and technicians, or after market part technicians?
I see your point but the ducati techs and big companies have laws and regulations to follow. Tuners do not. Their concern is performance TDI engine health ratio. If that weren't the case then there would be no aftermarket for exhaust, tuning, perfor.ance ecu's. Exhaust catalysts, etc etc. Not everything is set optimal from the factory hence the well known hypermotard engine surge due to lean condition .
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Old September 16th, 2018, 09:12 AM   #42
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Originally Posted by Araitim View Post
I see your point but the ducati techs and big companies have laws and regulations to follow. Tuners do not. Their concern is performance TDI engine health ratio. If that weren't the case then there would be no aftermarket for exhaust, tuning, perfor.ance ecu's. Exhaust catalysts, etc etc. Not everything is set optimal from the factory hence the well known hypermotard engine surge due to lean condition .
True - but even without the lean fuel requirements the closed loop is doing important work in adapting the fuel air mixture to the environment. This is a problem for aftermarket stuff because as they change fueling based mainly on attaining smooth performance, the closed loop will keep adapting and creating some lean surge. It is in their self interest to just bung the hole. It seems though, that rapidbike is more sophisticated in how it handles this.

I think the important thing is that the bike isn't left "guessing" due to the removal of the O2 sensor. An arbitrarily rich AFM could do damage to the molecularly thin cylinder lining/oil film interface. A controlled richening, based on o2 readings, probably wouldn't.
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Old September 17th, 2018, 01:58 AM   #43
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A tuner built a limited set of custom downpipes for my 06 Acura TL, a car with a notoriously secure ECU. The work around for the dirtier air triggering CEL's was lengthened O2 bungs that pulled the sensors out of the exhaust stream just enough to keep the ECU happy. Wonder why I don't see that for Rexxer and other mappers.
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Old September 17th, 2018, 02:17 AM   #44
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Originally Posted by gatdammit View Post
A tuner built a limited set of custom downpipes for my 06 Acura TL, a car with a notoriously secure ECU. The work around for the dirtier air triggering CEL's was lengthened O2 bungs that pulled the sensors out of the exhaust stream just enough to keep the ECU happy. Wonder why I don't see that for Rexxer and other mappers.
Rexxer already has mappings with disabled o2sensors in ECU (without engine light), for 821 and 939.
There is no need to put them on other places in exhaust system.
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