Does anyone know the reasoning for the two different part numbers at the power commander web site for the module in relation to year?, such as my 08 Custom , site says Powercommander V with Fuel & Ignition Adjustment, part #17-032, when you type in an 09 its say the required module is Powercommander V, part#17-015.
I realize the difference is one has an ignition adjustability, but why? do i really need it for my 08, or can i use the one for the 09 also?
I can't help you on the part numbers, I would contact Dynajet and ask them. The ability to adjust the timing (advance or retard) at various rpms allows you to take advantage of a modified A/F mix more than without.
RWB, Cobras Autotune model does not require an O2 sensor. KB
Hey KenDawg, I do not know everything, my brother does, if you don't believe it just ask him. But seriously I would much be interested to hear exactly "how" Cobra says they can "auto" tune without an 02 sensor. Reason is that without knowing what the unburnt fuel is coming out the exhaust the ECM cannot know how to adjust the mix for the target.
In open loop all the lookup tables (aka maps) have been engineered under controlled lab conditions. These are a "guide" for the ECM to use for a given engine. The ECM collects data from the sensors on the "going in" side and then makes a decision based on these pre-engineered maps.
After that the ECM know "nothing else" for sure without input from the exhaust. Some systems also have ION sensor circuits built into the coil to measure the current traveling across the edge of the flame of the combustion (a flame edge can conduct current). They do this by placing a capacitor in the coil to collect part of the collapse current surge on the primary side, and then releasing it very soon again to run across the edge of the combustion flame. This gives the ECM an idea of whether the spark is occurring in matching (or unmatching) characteristics based (again) on pre-determined and mapped data from an ideal scenario. This is used primarily for knock sensing on Harleys.
Without input from the exhaust, which to my limited knowlege can only be obtained currently from an 02 sensor, there is no other way to auto tune. The ECM and the Cobra etc has done "all" it can going in based on what it had at the time. I would love to hear where or how it's gonna get this data to further auto tune the machine.
What some of these ads will do is say they can automatically adjust the fuel mix richer than what the ECM has already done. That is not really an automatic anything, but rather they have only done the richening percent based on "their" ascertations. I was very pleased with the Doebeck I had on my Harley. It could be manually adjusted with a screwdriver. You could richen or lean the mix by "listening" to the engine after each adjustment.
But again to my knowlege the only way the ECM can "listen" is from data collected from the 02 sensors placed in the exhaust. But always ready to learn.