I'll break it down slightly for you using this example.
Again it is not limited to these controls. This is basically an example to show the reason for the two different units and sub structures within.
Parallel-
-Stock ECU still active along with the AEM PnP unit
- The stock ECU will still output commands to the following drivers: IAC, Cruise control, Dash (tach, speedo, fuel gauge etc), Vtcs opration , Vics chamber activation, Alternator compensation adn regulation, Powersteering Pressure. There are alot more but I think you all get the point.
- AEM EMS will directly control ALL of your Timing and Opening of the injectors. The stock ECU will have NOTHING to do with fuel or ignition any longer. The AEM will be programmed as a "sub contractor" to deliver the essentials needed to get the car running properly, efficiently and for the best possible performance at the given application.
- The Parallel system allows you to keep your everyday functions the same as it came from the factory. BUT still gives you the tunability you need to make it into a track monster.
- It allows you to always have the ability to PLUG your ECU back in god forbid you have any issues with the unit or drivability or ANYTHING. SAFETY precautions only guys. You never know when something can go wrong and you dont want to be stranded. Now depending on your level of performance you should not have ANY problems like this but it is a safety measure I like to employ.
(AGAIN , I wont go into every function as it will take all day and night just to post about it)
Standalone- The AEM EMS will control EVERYTHING. Fuel , timing Vics, Vtcs, AC compensation and control, alternator, blah and some more BLAH. EVERYTHING! That means addition tuning and labor. So naturaly the price will be higher.
Someone had mentioned something about CAM control? The protege doesnt have a "vtec" type setup BUT this is what you do control with it.
Depending on cam profile, the rpm scaling in the AEM can be varied so as to compensate for needed tuning in that range. In other words (lamens terms), If you desire to tune the cams with adjustable gears and would like to change your powerband, this is what you will do. Simply by "creating" resolution in the software for the particular range of rpm you are looking to modify. If the cams really start to breathe well around 4000 and fall off at around 6700rpm (example guys) we will have it tuned so that the AEM will have closer break points in that range . That way you can tune for every 200 RPM rather than 500-700 rpm. We can fine tune the fuel and igntion curve more precisely by inputing the range in which we prefer to have the AEM "pay more attention". Again there is alot more to it. Im just trying to generalize so everyone understands. This unit is amazing. It does everything. Or at least I should say it has the ability to do everything you need for the car.
Another good thing about the Parallel system and the Standalone is the following:
We can and will employ this on auto cars. Meaning in parallel mode we will contol the car for FI and NA just as well as it would be for a manual vehicle. Both the units will vary in function. The parallel system will utilize the stock controls in the ecu for the TRANS shifting BUT we can program it to "watch" the stock ecu and not let it over rev. OR when someone wants to go to full standalone we can control the auto tranny shiftpoints and VSS ETC. Trust me when I say EVERYTHING!