The FIA is clarifying the rule.
Team radio clampdown extends to Formula 1 pit boards - F1 news - AUTOSPORT.com
WHAT IS ALLOWED
- Acknowledgement that a driver message has been heard.
- Lap or sector time detail.
- Lap time detail of a competitor.
- Gaps to a competitor during a practice session or race.
- "Push hard", "push now", "you will be racing xx" or similar.
- Helping with warning of traffic during a practice session or race.
- Giving the gaps between cars in qualifying so as to better position the car for a clear lap.
- Puncture warning.
- Tyre choice at the next pit stop.
- Number of laps a competitor has done on a set of tyres during a race.
- Tyre specification of a competitor.
- Indication of a potential problem with a competitor's car during a race.
- Information concerning a competitors likely race strategy.
- Yellow flags, blue flags, Safety Car deployment or other cautions.
WHAT IS NOT ALLOWED
- Sector time detail of a competitor and where a competitor is faster or slower.
- Adjustment of power unit settings.
- Adjustment of power unit setting to de-rate the systems.
- Adjustment of gearbox settings.
- Learning of gears of the gearbox, allowing the ECU to record the position of the gears releative to each other for the seamless shift system (will only be enforced from the Japanese GP onwards).
- Balancing the SOC [state-of-charge of batteries] or adjusting for performance.
- Information on fuel flow settings (except if requested to do so by race control).
- Information on level of fuel saving needed.
- Information on tyre pressures or temperatures (will only be enforced from the Japanese GP onwards).
- Information on differential settings.
- Start maps related to clutch position, for race start and pit stops.
- Information on clutch maps or settings, e.g. bite point.
- Burn-outs prior to race starts.
- Information on brake balance or BBW (brake-by-wire) settings.
- Warning on brake wear or temperatures (will only be enforced from the Japanese GP onwards).
- Selection of driver default settings (other than in the case of a clearly identified problem with the car).
- Answering a direct question from a driver, e.g. "Am I using the right torque map"?
- Any message that appears to be coded.