it's a moderate learning curveAlso, please assume I know my way around a computer very well. Not so much around the EPROM.
tunerpro is easy to use, but how easy it is to tune with depends on the quality of your definition file, how things are labelled and commented and organized.
once you've turned a few things on and off in tunerpro and understand the basics, which i'm sure you already do....you just might not be changing things correctly...you need to work on your datalogging skills
having a spark advance, VE, or power enrichment fuel adder fuel table in front of you does you no good if you can't:
- understand how to drive to log effective data
- understand how to interpret and analyze that data
you say you know your way around a computer, how are your excel skills? they can be really valuable when you're faced with 10,000 log events and need to do something with them.
also how's your high school math? lets say you have an ECM output of 25, and a desired output of 30. do you understand that you'd likely need to scale something affecting that output by 1.2 to achieve the target (since 30/25=1.2 in other words there is a 20% increase required)
then what tuning really is, you want a sampling of achieved air fuel ratio (from a wideband in open loop, or trims in closed loop) that you use to identify a SIGNIFIGANT FUELING ERROR. you want to identify a region of a table that affects that erroneous fuel decision, and scale it to achieve your target.
i have this tool trimalyzer i wrote that chews up a log, filters it, and spits out a table of fueling errors in whatever shape/size you want, but you can use excel too
same kinda thing for spark, you can advance spark a little bit where you think it needs it, and afterwards log to identify any signifigant spark errors (usually knock would be the indicator). then blah blah same as above.
keep in mind the factory calibrations can actually be pretty good, so if you find yourself making dramatic changes to them, you might be screwing up somewhere. unless you have a heavily modified engine, it wouldn't be typical to see a 20% fueling error, or having to add 9 degrees of spark somewhere, for example.
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