Pick the problem first
If the car is hard to control, record where movement becomes difficult. If it stops early, record the distance. If you are saving for a purchase, compare net Cash and time.
Baseline → one change → repeat
Changing several parts at once hides which one helped. Keep a short note for each test so you can return to a previous setup.
- Run the current build and record your chosen outcome.
- Change one part or one placement while keeping the rest as similar as possible.
- Repeat with the same timing rule and comparable conditions.
- Keep the change only when its benefit is worth its cost for your chosen goal.
Do not confuse distance with profit
A farther run and a higher earning rate answer different questions. Record distance for a distance goal; use net Cash per minute for a savings goal. Keep any spending you count visible in the comparison.
Stop conditions
If results vary between attempts, repeat both versions before spending again. If an update changes a part, price or control, start a fresh baseline.
A short test record
Keep one line per attempt so the change and result stay together. This is a recording method, not an in-game feature.
- Date and build label: identify the setup you could reproduce.
- Change: name the single part or placement difference.
- Outcome: record distance, the specific handling problem, or Cash earned and spent plus minutes.
- Conditions: note anything that made the attempt unusual before deciding whether to compare it.