Emanage tuning question

[profane]

I know there is nothing such as negative duty cycle. However, you are adjusting the car's natural duty cycle by adding (+ in the EMU) or resisting (- in the EMU) the voltage.

If lets say 10v = injector at 100%, that would means 5v = 50%. Now if the injector is running at 50% at 4000rpm then you have the ability in the eManage to -/+ that voltage at that rpm. If the injector was at 0v then you'd obviously get an error because the injector would either be non-functional or the car would be off.

no..firstly ur not adjusting "natural" or factory duty cycle but ur adding on to the PWM pulse of the factory injector.

2ndly, the voltage never varies, only the duration varies, for instance, if d.c is said to be 30% than the injector is open or spraying fuel only 30% of the time its powered up.

fuel mapping of any sort is all about duration and nothing else.

 

[hardcoreep]

no..firstly ur not adjusting "natural" or factory duty cycle but ur adding on to the PWM pulse of the factory injector.

The natural duty cycle is determined by the programming in the ECU. That is the origin of the signal and I as said you're adding/subtracting from that signal, because it should never be zero unless the car is off.

2ndly, the voltage never varies, only the duration varies, for instance, if d.c is said to be 30% than the injector is open or spraying fuel only 30% of the time its powered up.

Not according to my tests and how I was taught to test for duty cycle on the Toyota, but I may be corrected at any time.

 

[profane]

The natural duty cycle is determined by the programming in the ECU. That is the origin of the signal and I as said you're adding/subtracting from that signal, because it should never be zero unless the car is off.


Not according to my tests and how I was taught to test for duty cycle on the Toyota, but I may be corrected at any time.

no hardcoreep..let me try to explain once more.

factory signals are fixed because the internal cpu or microcontroller can not be programmed not in 4efte's case anyway. thats the whole point of aftermarket systems (to be able to)!

u can never -/+ the factory injector signal or any other factory signal for that matter. u can only add to the existing injector pulse width modulation (pwm) signal.

this is what an injector signal looks like.

[img=http://img249.imageshack.us/img249/5921/pwmsignaltg4.th.png]


the wider the pulse the longer the injector sprays and the narrower the pulse the less time the injector stays open.

injectors wont work below a certain voltage. there solenoids will just not energise so it seems u were tot wrong.

in the actual case of the emanage blue, u increase fuel by adding extra pulse to the existing factory injector pulse and u decrease fuel by changing or clamping the voltage of the map/air flow sensor output signal.

for more clarity read the emanage s/w manual.