sorry to highjack this thread. i have always been interseted in this kind of stuff but never understood it. i know its used to measure the air fuel ratio but how is it benificial? cant you have your system dyno tuned and that be that? like using a tweecer or other similar components what advantage do they have over having it tuned in right once then left alone? once again i know it was off topic but i really would like to understand how and why this stuff works. if someone could let me on any info it would be much appreciated. pm me or send me some usefull links. thanks guys
if you have it dyno tuned at a shop, they burn u a custom chip yada yada, it will be tuned, BUT u change the intake, or gas octane or idk whatever, then that tune isnt %100 full potential, so whats that mean, pay another 400+bucks to have it retuned.....BUT if i have a self tuning system, u can tune it as many times as u want, and like for the Tweecer, u can burn like 4 different Tunes, and change them at a turn of a dial, u can make one for good gas mileage, mild power, for another spot, crazy all out radical tune for another spot, and all can be change at the turn of a dial, (if ur cruising, n someone pulls up

, turn the dial and ur ready to go), not saying me or you street race but saying an example of what it could do. Only downside with the Tweecer, u need to know how the computer works, with the load/fuel timing tables, etc., Its not like a plug and play thing. that might help a little