What the FT550 does on Flea
Flea uses a FuelTech FT550 as the main engine-management and race-data hub for the naturally aspirated 2ZZ-GE. The value is not one feature by itself. It is the ability to compare engine RPM, throttle, wideband, pressure sensors, launch behavior and gear changes in the same log.
Wideband
FuelTech Nano wideband data gives mixture feedback through the run.
Fuel pressure
Pressure data helps separate a fuel-delivery issue from a tuning change.
Oil pressure
Logging pressure through launch and shifts helps monitor the high-rpm 2ZZ oiling system.
Gear detection
The FT550 uses gearbox and speed information so logs show which gear the car is in.
Launch control
Flea uses the ECU’s race features to make the launch procedure more repeatable.
Datalogging
Fast and slow passes can be compared by RPM acceleration, shift recovery, pressure, throttle and other channels.
Flea C60 gear detection values
The current published FTManager snapshot uses six gears, a 4.53 differential setting, and these gear ratios:
| 1st | 2nd | 3rd | 4th | 5th | 6th | Diff |
|---|---|---|---|---|---|---|
| 3.17 | 2.05 | 1.48 | 1.17 | 0.92 | 0.73 | 4.53 |
These are Flea setup values, not a claim that every C60 in every market uses the same final drive.
How Flea uses logs after a pass
A useful comparison starts with the timeslip, then checks the log for the reason. Examples include:
- Compare RPM acceleration before and after each gear change.
- Check whether throttle stayed open through the pass.
- Review wideband, fuel pressure and oil pressure together.
- Compare shift recovery instead of looking only at peak RPM.
- Match the log to 60-foot, ET and MPH from the same run.