Civic 2016 1.5 Turbo CVT Europe - Flexfuel custom tune

[Ludo 262]

Hello,

As Flexfuel calibration was not available for my vehicle,
And despite many requests over several years ...
I finally made a custom tune.

This calibration was developed for a Honda Civic 1.5T CVT (2017) running French E85 (~60–75% ethanol).
The goal was drivability and stability, not maximum power.

Key Improvements :

• Smoother low-RPM drivability
The base map showed hesitation and “dead zones” around 1250–1750 rpm.
This calibration smooths torque and throttle response, making city driving more linear and predictable.

• Refined boost control for CVT
The TC Boost Command table was fully smoothed (no peak boost increase), reducing abrupt torque changes and improving CVT behavior.

• Ethanol ignition reworked for stability
Ignition transitions were smoothed instead of advanced.
Excessive ethanol ignition advance at very low rpm was reduced to improve low-speed stability and reduce ECU intervention.

• Fuel system behavior improved
Fuel pressure tracking is more stable, injector duty remains low, and no rail pressure drop is observed in WOT.
This reduces transient stress on HPFP and injectors.

• Cold start optimized for high ethanol content
Minor cold-start fueling adjustments improve starting without affecting warm operation.

Knock Behavior (Important)
A small, stable knock retard plateau (~4–6°) is still visible in part-throttle zones.
This behavior already exists in the stock/base map and is consistent with Honda’s anti-LSPI strategy.
- No knock escalation under WOT
- No negative impact on drivability
- Knock is now less intrusive and better controlled
- No Power Increase, No Added Risk
- No increase in peak boost
- No aggressive ignition advance
- Fuel system remains well within safe margins

Result
A more refined, smoother, and mechanically safer daily E85 calibration, especially suited for CVT.

"Use this calibration at your own risk"