Hi.
I thought that it might be a good idea to share what i found while trying to ROAD tune my gen1 turbo Hayabusa with the community.
Let me say that this is my opinion only, i am just trying to learn how to tune my bike my self which means that i could be wrong.
In order not to mess with my original 2007 gen1 ECU i bought a second hand 2003 ECU upon which i tried all my tests, i have built my own ecu flashing equipment which works fine and i do have a pcv with boost reference and an AEM wideband failsafe installed on my bike, the pcv boost reference comes from the AEM wideband gauge's analog output.
My fuel system consists of a Bosch external fuel pump, an 1:1 Aeromotive fuel regulator set at 43psi and Honda Firebird injectors rated at 340cc/min.
My aim is to road tune the bike the best i can and i shoot for 13.2 AFR below 4000 rpm and 12:1 above that, max boost is 12 psi intercooled.
I use the maximum PCV map resolution of 51 columns and i have adjusted the map in a way that the pcv's negative pressure region
use same values as the stock ecu by using a conversion table i found here OK...need some tuning help in ECU Editor.... - ECU hacking
By using the AEM wideband gauge i started tuning my bike using the pcv, something that worked very well indeed, the problems started when i tried to modify the ecu maps in order to reflect the needed changes and use the ecu with the pcv disabled (all maps with zeros).
What i found by repeated testing is that either the stock gen1 ecu does not control the injectors very well at low speeds (up to 2000 rpm), something that the pcv does remarkably well, or there is something in the gen1 ecu that does not let me lean the idle and IAT region as the best i achieved was 11,5:1 at idle and 12.5:1 at 3000 rpm, above that the ecu controls the injectors
and AFR very well.
The ecu almost behaves like it has a hardcoded lower limit for the injector timing at low rpm so if i try to use anything below it's "internal" low limit it discards it.
Another very strange thing i found is that the 2003 ecu when flashed with the exact same firmware as my original 2007 ecu behaved different on the road, it was much smoother when accelerating (btw the pcv was disabled by filling it's maps with zeros and it's acceleration enrichment was off).
The only thing i didn't tried was to physically remove the pcv, maybe it is interfering with the ecu injector timing even when its maps are filled with zeros.
Anyway that is what i found SO FAR as i continue to test various schemes....
Chris
I thought that it might be a good idea to share what i found while trying to ROAD tune my gen1 turbo Hayabusa with the community.
Let me say that this is my opinion only, i am just trying to learn how to tune my bike my self which means that i could be wrong.
In order not to mess with my original 2007 gen1 ECU i bought a second hand 2003 ECU upon which i tried all my tests, i have built my own ecu flashing equipment which works fine and i do have a pcv with boost reference and an AEM wideband failsafe installed on my bike, the pcv boost reference comes from the AEM wideband gauge's analog output.
My fuel system consists of a Bosch external fuel pump, an 1:1 Aeromotive fuel regulator set at 43psi and Honda Firebird injectors rated at 340cc/min.
My aim is to road tune the bike the best i can and i shoot for 13.2 AFR below 4000 rpm and 12:1 above that, max boost is 12 psi intercooled.
I use the maximum PCV map resolution of 51 columns and i have adjusted the map in a way that the pcv's negative pressure region
use same values as the stock ecu by using a conversion table i found here OK...need some tuning help in ECU Editor.... - ECU hacking
By using the AEM wideband gauge i started tuning my bike using the pcv, something that worked very well indeed, the problems started when i tried to modify the ecu maps in order to reflect the needed changes and use the ecu with the pcv disabled (all maps with zeros).
What i found by repeated testing is that either the stock gen1 ecu does not control the injectors very well at low speeds (up to 2000 rpm), something that the pcv does remarkably well, or there is something in the gen1 ecu that does not let me lean the idle and IAT region as the best i achieved was 11,5:1 at idle and 12.5:1 at 3000 rpm, above that the ecu controls the injectors
and AFR very well.
The ecu almost behaves like it has a hardcoded lower limit for the injector timing at low rpm so if i try to use anything below it's "internal" low limit it discards it.
Another very strange thing i found is that the 2003 ecu when flashed with the exact same firmware as my original 2007 ecu behaved different on the road, it was much smoother when accelerating (btw the pcv was disabled by filling it's maps with zeros and it's acceleration enrichment was off).
The only thing i didn't tried was to physically remove the pcv, maybe it is interfering with the ecu injector timing even when its maps are filled with zeros.
Anyway that is what i found SO FAR as i continue to test various schemes....
Chris