Pay attention to the Machine Setting graph before racing. Each F-Zero racer can be customized by moving the slider to the left or the right.
Acceleration / Left-Balanced:
Move the line to the left to balance the car for quick turning. This setting is appropriate for technical courses with many sharp turns and few long straights. The car will boost off the start much faster and perform better while drifting. When using a car balanced for acceleration, use the drift turn technique (press L and R while turning) to prevent speed loss in corners.
Top Speed / Right Balanced:
Move the line towards the right to balance the car for faster top speeds. This setting is best for courses with long straights (or pipes) and few sharp turns. The car doesn't drift as well and has lower acceleration after impacts or from the start line. Use the slide turn technique to navigate around corners (press R while turning right, L while turning left) and follow the apex of the curve for best results.
Unlock Dark Schneider
To unlock the Dark Schneider, beat all of the chapters in Story Mode.
Unlock Diamond Cup
To unlock the Diamond Cup, come in first place in the Ruby, Sapphire and Emerald Cups (on Standard or Expert).
Unlock Master Class
To unlock Master Class, come in first place in the following Cups on Expert: Ruby, Emerald and Sapphire.
Unlock AX Machine Parts
To unlock the AX machine parts, beat Story chapters on the Hard difficulty.
Unlock AX Pilots
Beat the Story Mode chapters on Very Hard to unlock AX Pilots.
Unlock AX Tracks
To unlock AX Tracks, get first in AX Machine Tracks or beat all the grand prix on Master.
Unlock Diamond Cup
To unlock the Diamond Cup, come in first place in the Ruby, Sapphire and Emerald Cups (on Standard or Expert).
Garage
When you are in the garage, don't pay attention to the part rating. What you want to pay attention to is the chart at the bottom right. The larger the section graphed, the better the vehicle. I have found that what you want to go for is max speed and grip. With these settings, you will be ahead of the crowd.
Unlock qqq
To Unlock qqq you must defeat Chapter 3 in Story mode on Very Hard.