chevaliernoir
Member
For racing purpose, max torque/power is of course a key parameter, and piggyback ECU as PCV, GET, Powertronic, Bazzaz is good for us.
For road usage, we are not interested only in full load, but also partial load.
Removing the calatyst converter, we don't care anymore to be at lambda 1, and we would prefer to tune the engine with the best richness for engine stability, for example, (or consumption if I want...)
Then I feel that piggyback is "dangerous" :
If we increase richness (for example +10%) in the closed loop area, to improve drivability or reduce temperature maybe, then the closed loop control of the ECU will slowly compensate by applying -10% for example.
Even worse : what is learnt by the ECU in closed loop conduitions, is ofter applied also in open loop condition. Then the ECU will apply also -10% in full load.
So the overall effect of +10% richness in partial load could become in fact -10% in full load!
Even worse, as the learning and adaption of the ECU takes some time (typically ~10 minutes in stabilized closed loop condition with engine hot).
So if we tune the piggyback ECU at dyno and test it, we have the expected befavior and we can be proud and happy of it... at the moment
But at the end, after real usage, all the gain could be lost, and the behavior could be worse than the original one.
This is my fear I have about piggy back tuning method that keeps the closed loop active. (is there a system that can de activate the closed loop control?)
I know very well the standrad ECU mounted on bikes and the strategy as this is my job, but I don't know the Bash one used on RC390, and don't have any experience on tuning these ECU, so I could be wrong, and I'm interested in your feedback about it.
Thank you
For road usage, we are not interested only in full load, but also partial load.
Removing the calatyst converter, we don't care anymore to be at lambda 1, and we would prefer to tune the engine with the best richness for engine stability, for example, (or consumption if I want...)
Then I feel that piggyback is "dangerous" :
If we increase richness (for example +10%) in the closed loop area, to improve drivability or reduce temperature maybe, then the closed loop control of the ECU will slowly compensate by applying -10% for example.
Even worse : what is learnt by the ECU in closed loop conduitions, is ofter applied also in open loop condition. Then the ECU will apply also -10% in full load.
So the overall effect of +10% richness in partial load could become in fact -10% in full load!
Even worse, as the learning and adaption of the ECU takes some time (typically ~10 minutes in stabilized closed loop condition with engine hot).
So if we tune the piggyback ECU at dyno and test it, we have the expected befavior and we can be proud and happy of it... at the moment
But at the end, after real usage, all the gain could be lost, and the behavior could be worse than the original one.
This is my fear I have about piggy back tuning method that keeps the closed loop active. (is there a system that can de activate the closed loop control?)
I know very well the standrad ECU mounted on bikes and the strategy as this is my job, but I don't know the Bash one used on RC390, and don't have any experience on tuning these ECU, so I could be wrong, and I'm interested in your feedback about it.
Thank you