ThunderMax Decel Fuel Cut Feature Use User Manual

Decel Fuel Cut

The Decel Fuel Cut option is a feature of the SmartLink Software that
comes standard with the ThunderMax EFI System. If you have installed the

ThunderMax with AutoTune on your motorcycle, ridden your bike, and
discovered that your bike backfires at specific RPMs on deceleration – this
feature can be turned on to quickly and easily correct the problem. The Decel
Fuel Cut feature does not turn on by default, but must be applied manually in
the SmartLink software. Use the information provided below to adjust this feature
for your specific needs.

Decel Fuel Cut Features
The Decel Fuel Cut option I located in the TUNING MAPS TREE under

BASIC SETTINGS, then MODULE CONFIGURATION.

Decel Fuel Cut:

The “Decel Fuel Cut” option is the ON / OFF switch for the Decel Fuel Features.
Using a value of (0) turns the feature off, and a value of (1) turns on this option.
For example, if your motorcycle does not currently pop on deceleration, it is not
recommended to activate this feature. If you are experiencing deceleration

popping, set this value to (1) and proceed forward to setting the Decel Fuel
options.

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.

Decel Post Fuel Enrichment:

The Decel Post Fuel Enrichment feature is similar to an accelerator pump on a
carburetor. This enrichment feature smoothes the transition from an OFF to
ON throttle condition and makes it as seamless as possible. This seamless
transition is achieved by not allowing the manifold to enter a “dry” condition that
can occur on long periods of deceleration, which may cause a pause, or a lag, in
throttle response once the blade is opened. The Decel Post Fuel Enrichment has a
range from 0 to 100, with the default setting of 16.08.