Originally Posted by pomansouth
from what i know, fuel, air, timing, and that should be it. but for vtec, you have high cam and low cam, and then you have to street tune because the car is on the dyno which has no load on the motor. so if you tune on the street also, you get to tune with the motor under load.
if using a dynapack, it allows you to place a load on the engine, so you can do 'street' tuning while on the dyno.
Originally Posted by westcoaststyle
The Greddy blue box is an untunable controller that acts as a 'piggy-back' to your ECU. The VAFC/SAFC are also piggy-backs. These allow you to make minor adjustments to fuel trim and timing (I think). They are not as detailed or tunable as a full EMS.
as far as i know the afc's dont have any ignition timing control