piggybacking the knock control unit to retard timing under boost
03-11-07, 09:01 PM
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piggybacking the knock control unit to retard timing under boost
As far as i know the knock sensor and knock box are used to retard the timing under detonation & pre-ignition (just so we don’t get any squabbles )
Has anyone thought about ( if its even possible as i may be barking up the wrong tree )removing the knock box and using its connection to the ECU to try and retard timing to a specific amount? or a “there about” amount as the case may be?
As we all know the limitations of using a SAFC is the fact that it advances the timing when you decrease the AFM signal when using larger injectors.
Its my understanding the knock control does this, but as we all know it is usually far to late to save the motor. BUT what about it it some kind of controller is used to activate the signal to retard or advance the timing?
I dont know how/what the signal is that it sends to the ECU but im sure someone does and can clear this up?
From what ive read so far the knock control box sends a very low voltage signal to the ecu which then interprets that and retards the timing. the exact voltage i do not know.
the other thing i keep reading is that it ignore the knock control after 4k rpm ( i may have go this mixed up )
do you think it is the ecu ignoring the knock control or the knock control ignoring the sensor? as this could be very vital information.
also, does the ecu have a set amount which it retard the timing when it gets a signal or is it in relation to the strength of the signal it gets from the KCB?
PS sorry if this has been asked before
Has anyone thought about ( if its even possible as i may be barking up the wrong tree )removing the knock box and using its connection to the ECU to try and retard timing to a specific amount? or a “there about” amount as the case may be?
As we all know the limitations of using a SAFC is the fact that it advances the timing when you decrease the AFM signal when using larger injectors.
Its my understanding the knock control does this, but as we all know it is usually far to late to save the motor. BUT what about it it some kind of controller is used to activate the signal to retard or advance the timing?
I dont know how/what the signal is that it sends to the ECU but im sure someone does and can clear this up?
From what ive read so far the knock control box sends a very low voltage signal to the ecu which then interprets that and retards the timing. the exact voltage i do not know.
the other thing i keep reading is that it ignore the knock control after 4k rpm ( i may have go this mixed up )
do you think it is the ecu ignoring the knock control or the knock control ignoring the sensor? as this could be very vital information.
also, does the ecu have a set amount which it retard the timing when it gets a signal or is it in relation to the strength of the signal it gets from the KCB?
PS sorry if this has been asked before
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