Effect of boost control cutout prior to +12 psi boost modifications

[Viper2000]

The physics of the supercharger and the ABC are unaffected by the fuel used.

The fuel only affects the boost pressure that can safely be used without detonation.

If the engine hasn't be modified for +12 operation then disabling the ABC and moving the power lever fully forward will fully open the engine throttle which will deliver +17 psi boost. This will break the engine; but it will break rather faster with 87 octane fuel than with 100 octane fuel.

If the ABC has had the cutout mod embodied, operation of the cutout will only produce a maximum of +12 psi boost, which will prevent detonation and thus avoid immediate engine damage, provided that 100 octane fuel is used. If you operated the cutout with 87 octane fuel in the tanks and the power lever fully forward then the engine would start making expensive noises in relatively short order.