Navigate: Home | Find your bike | ECU | TRE | FCE | Contact | Other ProductsNews | Testimonials
  
 
 
FCEtm page

What is"Fuel Cut" ?? - (Jerky throttle operation)

Demonstration Videos here:

Please be sure to read my comments below each video


Enabled: https://www.youtube.com/watch?v=Ue4SKOcHSUk
Live datalog Enabled: https://www.youtube.com/watch?v=wgBznc8yXJc


Disabled: https://www.youtube.com/watch?v=0jrDHTcHwN4

Live datalog Disabled: https://www.youtube.com/watch?v=7i2vCGnyuGk




FUEL CUT IS THE ROOT CAUSE OF JERKY THROTTLE

Smooth throttle control cannot be achieved without disabling this, however disabling this alone does not always give a smooth throttle.
Ignition and fuel adjustments need to be correct at small throttle openings as well.

"Fuel cut" happens when you release the throttle anytime above a preset rpm that is programmed into your bike's ECU, in other words...
the injectors will stop during decel. (when you release the throttle) effectively turning the engine off....
just the same as if you turned the igniton switch off.

*****You can test this yourself by putting your bike in 3rd or 4th gear and bring it up to appx 60 mph and release the throttle...
Then while the bike is slowing down, just operate the kill switch on the right handlebar "off to on" repeatedly (without touching the throttle)
You will find that there is no effect from this because the engine is not running.*****

Upon re-application of the throttle, there is a time delay as your injectors start back up, and the time it takes to re-wet the intake tract, and combustion chamber.
This can easily bee seen in the videos as well.

The rider feels this as a delay and jerky response from closed throttle....
This is especially important while leaned over in a turn or trying to re-apply the throttle from the closed position.

Fuel cut can also be heard and seen with an aftermarket exhaust as a loud pop/bang/flame and jerk when the injectors come back on as you re-apply
the throttle from the closed position.... as can be seen in the videos above.


Bikes with stock exhaust and/or catalyst still in place may not see the or hear the flame/popping,
but the throttle feel and behavior will still be the same as in the videos.

The reasoning behind shutting the fuel off on decel (basically turning the engine off) is:
If the throttle is closed, then why keep the engine running?
The sole purpose of fuel cut is for reducing emissions.

When the fuel is turned off, engine braking and throttle tip-in cannot be adjusted because the engine is not actually running.
To be running, an engine needs 3 things, fuel, air and ignition....
If you remove any of these 3 things, the engine isn't running.
This is why when the injectors stop, it's the same thing as if you turned off the key, or the kill switch.

So, with stock ECU programming, or programming that has not disabled fuel cut, you are actually turning the fuel on and off with the throttle
as you decel and re-apply the throttle.... This can easily be heard and felt while you are riding, and is demonstrated in the above videos.

No amount of fuel adjustments, cable adjustments, or replacement throttle tubes will solve the jerky throttle response that fuel cut causes.
They cannot do this because the engine isn't running during decel.


You can ALWAYS feel it when the injectors stop and restart every time you close and re-apply the throttle when fuel cut is enabled.

I have included diasbling fuel cut for your bikes in all my ECU programming that I offer to you.
As a result there is a very marked difference as to how much better the entire bike responds and behaves under any riding condition....
This includes all aspects of handling and changing gears because the bike doesn't pitch back and forth on it's suspension as you turn off the engine
and restart it again...every time you manipulate the throttle.

Transmission shifts will be a lot smoother because you can create a "neutral throttle" load, and take the load off the transmission gears.
They move a lot easier when there is no load against them.

Fuel cut just takes all the fun out of enjoying being leaned over in a corner trying to re-apply the throttle without upsetting your line, or
your concentration while trying to manuver in traffic quickly, or your passenger banging their helmet into yours when changing gears.

By us disabling fuel cut, your bike is transformed into a perfectly smooth and predictable ride under any riding condition,
and the rider can pay more attention to where he/she is going rather than how carerfully the unpredictable throttle is re-applied.


All models will benefit from no loud backfiring and jerky throttle upon throttle re-application when this annoyance is disabled.

All FCE products are discontinued - No longer available

We now include this feature in all of our ECU programming.

 

 

Navigate: Home | Find your bike | ECU | TRE | FCE | Contact | Other ProductsNews
| Testimonials