ThunderMax Decel Fuel Cut Feature Use - Manual (Page 3)

Decel Fuel Cut Rpm Low:
The “Decel Fuel Cut RPM Low” setting should reflect the lowest RPM
where the deceleration popping is occurring. This feature is set at 2048 RPM
by default however the setting is adjustable from 1280 to 3040 RPM. Simply take
note of the RPM where the popping stops and set the “Decel Fuel Cut Rpm Low”
value approximately 50 RPM below this point. This is where the fuel cut process is
terminated. Fuel delivery is returned to normal below this RPM.
Decel Fuel Cut Rpm High:
The “Decel Fuel Cut RPM High” setting should reflect the highest RPM
where the deceleration popping occurs. This feature is set at 2400 RPM by
default; however the High setting is adjustable from 2048 to 4064 RPM. Simply
take note of the RPM where the popping begins and set the Decel Fuel Cut Rpm
High value approximately 50 RPM above that RPM. This setting will be the RPM at
which the Decel Fuel Cut is triggered during acceleration.
The following graph depicts three scenarios to aide in your understanding of the
Decel Fuel Cut function.
“Action 1” represents a situation where both the Low and High Fuel Cut
RPMs are achieved; the Decel Fuel Cut is triggered, activated, and deactivated.
“Action 2” shows a situation where the High RPM was NOT achieved,
and the Decel Fuel Cut is neither triggered nor activated.
“Action 3” shows how once the Decel Fuel function is triggered, it will not deactivate
until after the engine RPM falls below the Decel Fuel Cut Low RPM.