What this table is for
During a flat shift, the ECU has to drop engine torque for a moment so the gearbox can change gear with your foot still down. With the Flat Shift Cut Type set to Ignition Retard, the Nexus does that by pulling timing instead of cutting fuel or spark. This table sets how much. It can be mapped in up to three dimensions, with up to 8 x 8 breakpoints, so the amount can change with things like RPM and load.
When to use it
Retard is a softer way to reduce torque than a hard cut. It suits cars where a cut is too violent for the driveline or where you want a smoother shift.
What to check
- Log gear change time against the retard amount. Too little and the gear will not release cleanly.
- Heavy retard sends heat into the exhaust, so watch exhaust temperatures and turbo health.
- Confirm the flat shift trigger with the flat shift wiring notes and set recovery time so torque returns smoothly.
Need to see Haltech's screenshot of this table? Ask us and we'll send it over with advice for your build.
