In Crash Team Racing, you can get up to 3 turbo boosts by power-sliding. There is a power-meter that, when it turns red (about halfway on the meter) means you're ready to perform a boost.
The bar on the bottom right, filling up:

Ready to boost!

However if the power meter fills out, you'll backfire and be unable to boost.
Long story short, There's a specific timeframe when you can boost, on one side, your power bar is too low, on the other, too high. However the sweet-spot is long enough that you can control when you want to hit the boost, which is useful for timing boosts when you're screaming around corners etc.
What I want to know is, should I be aiming to hit the boost as soon as the bar turns red, or should I wait and hold off until it's closer to the end?
Does holding off give more 'boost' time?