Quote:
Originally Posted by ShadowMan
Doesn't make sense to buy a power fc if there is only one tuner around and he is an AEM guru.
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Heres one thing you may not know... Engine Stand Alone computers all use the same basic idea to tune your engine- numbers go into a set of maps that is cut up by breakpoints that dictate timing and fuel!
ALL stand alone ECU.
One day, my friend brings me his AEM SR20 to tune. I have NEVER tuned an AEM before... but I had that thing plugged in and tuned fine, even had a nice crispy edged map worked out for it,
the same day. Knowledge of computer systems and how ECU will interpret sensor data, knowing what the numbers mean, and knowing enough about internal combustion engines, is all it really takes to tune
anything... no "experience" necessary... although it does speed things up, it is
not required if you know how to tune in general.
This is the actual dyno from that day
Now, keep in mind, I specialize in street car daily drivers, as this was. So I knew, for instance, that at maximum power potential (350rwhp was expected... and delivered) I will be using about 80% of the 550cc injectors provided fuel pressure was set like OEM or less (goal). So on my injector duty cycle chart for the map, you consider the amount of time required to fire and injector is dwindling by 7000rpm to somewhere less than 12 milliseconds (.0012 seconds) I had the wide open throttle portion tuned before I even turned on the computer because my final basemap line would read about 80% duty cycle. Doesnt matter, AEM,PFC,Haltech, etc.... they are all going to report around 80% duty cycle (12ms of fuel perhaps less) around peak power maximum rpm. Notice the headroom of the fuel system for error at maximum RPM. 10:1! plenty of injector, they dont act funny or stop working when you push them to 90% or 95% duty cycle.