haw can I know if the value in the IFR table (LS1_Edit) is 100% duty cycle or not and haw to change it to 100%

 

C'mon guys...

 

why would you want to do that? YOu will eventually burn out your injectors or worse create a lean condition if in fact you need more than what the injectors flow at 100%. If you are making any changes with EDIT you NEED some type of logging software. Making any changes without seeing what you changes you made or how the changes affect teh car can be very dangerous

 

EFILive will give you that information from the pulse width. But I think you are looking at it backwards; if you discoved there was a condition under high load/high rpm or something that caused them to go to 100%, that would be when you would want to put in bigger injectors just so this wouldn't happen.

 

thanks Cal, Iam planing on baying EFILive, but can I know what is the 100% pule width?
since it's limted in the IFR table "I think"

 

The IFR table is just a value that describes how big the injectors are. This value is essentially a function of the injector itself - there is no real way to tweak this to reduce the duty cycle - you can tell it that it is bigger than it is, but this will just cause a massive lean condition.


100% duty cycle will depend on both how big the injectors are and the airflow going through the motor. Basically you just need to purchase injectors that will be appropriately sized for your airflow and then check the duty cycle with efilive or some other scan tool.

 

Duty cycle is dependant on engine RPM ... You're comparing the total available time for an injector to be open, to the time it is actually open. The faster the engine turns, the less time is available.

Duty cycle in % = pulse width in ms / (60/RPM*2*1000) * 100

For example:
6000RPM, 100% = 20.00ms, 80% = 16.00ms
6500RPM, 100% = 18.46ms, 80% = 14.77ms
7000RPM, 100% = 17.14ms, 80% = 13.71ms