[Ahernandez0909]

Originally Posted by polancd

At a really basic level, you are changing your cars afr ( air fuel ratio) and timing to make more power.

How will it make the car better? when you add parts to your car it can change the afr, tuning can correct this and maximize the power from your parts. yes you can tune a stock car and make more power.

Couldn't Scion/Subaru/Toyota have done it themselves? They did, it is the factory tune. they were not trying to squeeze out every ounce of power due to different factors around the world, ( like altitude and fuel )

Would that void my extended warranty? Yes. It is possible for a tune to void your warranty, but most systems can revert back to stock quite easily.

How is it done? It can be done a couple of different ways. standalone's replace the entire ecu, piggybacks work with the stock ecu, and flashes replace the stock ecu maps.

In general a tuner will put your car on a dyno, datalog it , then change the map and repeat until he/she thinks they cant extract any more power safely.

What does Visconti do? I don't understand how he sends you a "flash" a "license" and a cable