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ORIGINAL: silvermaster92
forgive me and my "make you want to kill me noob" questions, but what is a tune?[&:]
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A tune basically is a modification of the “program” that runs the car. Your car has a computer and like any other computer it has a program. The program controls many different facets of motor and transmission (if automatic) operations.
It controls when each cylinder is fired, how much fuel is delivered to each cylinder, the timing, it adjust the fuel based on feedback from the oxygen sensors or what’s known as the A/F ratio (Air/Fuel).
It’s more complex then that with many of tables, such as fuel tables, and depending on temperature, elevation etc it will deliver the correct amount of fuel and time it just right to fire the plug to get the best mileage and least amount of bad emissions from the exhaust.
What a tune means is simply another “program” that overrides the stock program that came with the car. By “twicking” the fuel tables and spark advance/retard it can give you more horsepower and safely as well SO LONG as you purchase from a reputable and experienced “tuner”. Brenspeed.com is a supporting vendor and I have heard nothing but good things from that vendor so you would get a safe “tune”.
A “tuner”, also known as XCal2 and a few others, is the device that holds the tunes on a memory chip. You plug it into the OBDII port (under the dash, by your legs) and it will first upload the factory tune and then download the performance tune.
Typically, from what I have gathered, is a “turner” alone will gain you about 15hp to the rear wheels and if you get a CAI (cold air intake) and depending on fuel octane, you could gain 25 – 30hp to the rear wheels.