[sawjet]

>I mean, it's easy to get 20% more power out of an engine if you don't care if it idles like a washing machine

Can you explain this? How does remapping an ecu make the idle different?

[eschneider]

Sure, you're basically running the engine with a different tuning and you can't optimize for everything. Getting more peak power, or a broader power band out of an engine often means sacrificing smoothness in other parts of the power band.