1998 NB Ignition Timing

Technical Area Engine, Transmission, Exhaust etc
1
  1. My model of MX-5 is: NB 1.8
  2. I’m based near: Northampton
  3. I’m looking for technical help or recommendations on: Ignition Timing

I checked the Ignition timing with one of those stroboscopic guns where one can measure the ignition advance. The timing on my car at 900 rpm was 10 Deg BTDC as stated in the Official Manual. However I would like to know what the maximum specified advance is at 4000 rpm. The manual does not give this figure. I know the advance curve is determined by the PCM but would like to check what it is in practice.