Drivability and how a calibration feels

The calibration the driver feels

The tuning pages for each ECU family follow a request from the pedal into fuel, air and a limit. The pages below stay on the behaviour that request produces: smoke, a soft pedal, a shunt, a rough idle, cold knock, a stumble off overrun, boost that arrives late, and a car that learns its way to a different feel. They are not map packs, and a parent ECU is not implied. Use the family page before changing a file.

Diesel

Diesel smoke limits. Fuel held to the air that is actually there, and the puff or the hole that follows.
Injection timing and combustion noise. Start of injection, pilot, and rail pressure.
EGR and part-load behaviour. Fresh air, smoke and response below full load. This is how the system works, not how to remove it.
Cold start and warm-up. Start quantity, glow, and why a hot log misses a cold complaint.

Family control paths: EDC15, EDC16, EDC17, MD1.

Any engine

Tuning boxes and pedal boxes. A diesel box usually falsifies rail pressure, a turbo petrol box usually falsifies manifold pressure, and a pedal box only rescales the accelerator. Read the warnings before treating either as a calibration.
Pedal response and surge damping. The pedal as a request, the filter that stops a shunt, cruise and road-speed limits.
Idle speed and smooth running. Target speed, auxiliary loads, and one cylinder not matching the others.
Torque requests and the limit that wins. Gearbox, traction, temperature, smoke and protection.
Turbo response and the torque you feel. A late target, a late turbo, and an overshoot.
Overrun and return to throttle. Fuel cut, and the stumble as fuel comes back.
Adaptations and calibration drift. Learned corrections that survive a restart.
Logging a drivability complaint. What to record before editing.

Petrol families already written up

Driver demand, warm-up, knock and boost are already specific on these pages. The shared notes above point at them rather than replacing them.

Hardware that the calibration has to know about, including cams, turbos and fuelling parts, is in the performance section, starting at engine performance upgrades and ECU remapping. Emissions chemistry and aftertreatment are in petrol and diesel emissions.

Sources

Each linked page carries its own sources. The diesel behaviour pages rest on Bosch's Electronic Diesel Control description (2001). The petrol pointers rest on the family articles already published here.