i think is something around 104... but to be honest doesnt matter as alcohol cool everything they usually performe like higher octane fuels in some occations... you will not be octane limited to tune that car, we have 97ron pump gas here and I have tune 250whp 2.0 B series without problems reaching MBT, as the B series ussually you dont have really high CR as other engines (cause is very difficult to get more without modifien the combustion chamber on the head). 12 or 12.5 is ussually what you get from those engine and with massive cams to make the power you shouldnt run into problems with knock, be aware cause you never know but with methanol you are gonna be fine.
you just need to tune your engine, any respetable tuner should do a good job on a NA build like yours. I have tune some BMW engines and if you ask me they normally run from 25-28 of advance at wot with everything tune (good fuel map). The base map is always safe so is normal that a final tune has more timing and normally less fuel aswell. If you are gonna tune the engine I would start with the base map not the one from the rally car. Tune the fuel map and then go to the dyno and tune the timing.
dont forget to follow the instructions to configured that sensor on the software, is very easy to do but it have to be done or the engine wont start:
The Nissan 360 Opto Trigger Mode is designed for use with Nissan optical Crank Angle Sensors (CAS) that have 360 evenly spaced slots and 4,6 or 8 different width slots. Digital trigger decoding uses all of the 360 slots to achieve precise engine position calculation.
Of the 4, 6 or 8 slots, one will be wider than the others. This Widest Slot is used by the ECU to determine the engines position in the firing order. As the width of this slot varies depending on the exact CAS used, an automated setup procedure has been provided.
Note: THE ENGINE WILL NOT START when Test ECCS Sync is turned ON.
Setup ECCS Trigger Decoding as follows (Read the entire process and ensure you understand before starting):
Ensure the 360 slot signal is wired to the ECUs Trig 1 input.
Ensure the 4,6 or 8 slot signal is wired to the ECUs Trig 2 input.
Switch the key on, do not start the engine.
Connect to the ECU using PCLink.
Ensure all Configuration options are correct.
Under the Fuel heading, select Fuel Setup. Set Injection Mode to OFF. This will prevent the engine from starting.
Under the Triggers heading, select Trigger Setup.
Select Nissan 360 Opto as the Trigger Mode. Note that this will initialise all trigger inputs to default values. The default values are as follows:
Trigger 1 Type = Optical/Hall
Trigger 1 Pull up = ON
Trigger 1 Filtering = Level 1
Trigger 2 Type = Optical/Hall
Trigger 2 Pull up = ON
Trigger 2 Filtering = Level 1
Select the resolution mode. Select Low Res Mode = ON for engines with aggressive cam shaft profiles or lightweight flywheels. This will provide improved timing stability on engines that have large variations in CAS rotation speed per revolution.
Set Test ECCS Sync to ON. This will put the ECU into a special mode where it will automatically calculate the position of the widest slot. Note that in this mode the ECU will disable both fuel and ignition. Enabling this function will also initialise the ECCS Widest Slot value to 0.
Open the Triggers/Limits tab of the Runtime Values window (F12 key).
Crank the engine. This will start the widest slot calculation procedure. This procedure will take about 4 seconds. If the procedure executes correctly, the following should be observed:
The Trig 2 Signal run time value will display YES first, indicating the ECU detects a correct 4, 6 or 8 slot trigger signal. If this value displays as NO during cranking, check sensor output and wiring.
Trig 1 Signal runtime value will then display YES, indicating the ECU detects a correct 360 slot trigger signal. If this value displays as NO during cranking, check sensor output and wiring.
Finally the ECCS Sync runtime value will display YES when the process has finished.
ECCS Widest Slot will change from zero to a value indicating the width of the slot (typically between 5 and 25).
If after 10 seconds of cranking the ECCS Widest Slot value is still zero, an error has occurred. Recheck all trigger wiring and test the CAS output. If this is OK, repeat the entire procedure.
If the process completed successfully, switch Test ECCS Sync to OFF.
Remembering that the Injection Mode is still set to OFF, crank the engine and check that a stable engine speed (RPM) is obtained and the value is consistent with a typical cranking speed.
Set Injection Mode back to the desired option.
If all is OK, perform a store to permanently save all settings to the ECU.
Set the base timing before attempting to start the engine (DO NOT JUST TRY STARTING THE ENGINE!).
I just copy paste the info that you can find on the help section of the software, is really usefull you should try it you will probably learn about a lot of stuff searching for your answers.