What does the tuner do?
I am looking at getting a tuner, and looking at something like the Hydra from PHP. What I am wondering is what exactly does the tuner do? Does it optimize air, fuel, and transmission shift points? Should I get what I want on the truck and then get it tuned?
If I get a tuner like the Hydra, and then I add the Wicked Wheel, is my truck then really not "tuned" because the configuration of my truck has changed. My understanding is a truck is tuned for what you have installed currently.
Please educate me on this topic.
Thanks in advance.....