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Message: <blockquote data-quote="delling3" data-source="post: 1474675" data-attributes="member: 22616">So, a bit of hi-jack here, but can someone please explain tuners to me?  Tuners for dummies I guess.   I understand that they can be used to alter various parameters (i.e. ignition timing) to improve performance over the conservative settings that Ford's engineers programmed into the ECU.  There are "canned tunes (i.e. 93 Octane tune) which will improve performance a bit, but that real bang comes from a "dyno tune" when a knowledgeable tech alters parameters on the dyno to get the maximum benefit out of whatever level of engine build you are running in your car.  Do I have it right so far?  Assume I have a NPI motor, with aftermarket Stage 1 cams, a P.I. intake, running an automatic and 3.73 gears, will a "canned tune" benefit me, or do I really need to dyno tune the car?  Are the parameters stored in the ECU, or does the tuner stay connected overriding the ECU settings?  Why do I see so many ricer dudes that are running tuners on a mount in their cars?</blockquote>