[Racer x]

Thanks blue
I may try Iridium plugs later. But right now I have a real problem with the voltage .
this is what happens.
The lack of time to charge the coil to full strength (as rpm rises), means there is less and less Voltage available at higher rpm.
Now this isn't such a problem WITHOUT nitrous, as the NA charge density (and therefore cylinder pressure) doesn't reach anywhere near the same levels as they do with nitrous.
However, when you add nitrous you increase the PRE-COMBUSTION PRESSURES and that requires MORE VOLTAGE, rather than DECLINING Voltage that we are stuck with.

The result is as follows;

Pressure rises and reaches peak pressure JUST as the spark is required.

The strength is inadequate so it CAN'T jump the plug gap WHEN INTENDED.

The piston continues to rise and FALL but WITHOUT the spark occurring.

As the piston FALLS so does the pressure in the chamber and at the point where the pressure is lower, than the level where the Voltage IS adequate to jump the plug gap IT DOES and a spark is created and the combustion charge ignited.

UNFORTUNATELY this is FAR TOO LATE and as a consequence power FLAT LINES or at worst FALLS compared to what WOULD be the case if the spark was strong enough to fire at the CORRECT TIME/PRESSURE.