I had a SE stage 4 put in a couple years ago. Bike is a 2009 Fat Bob and rides great but wondering why the DYNO lines are so squiggly. Especially the Torque between 2000-2800 RPM?

At the time the Kit came with Ported heads, injectors, 10.5 compression pistons, 259e cams and 58mm throttle body. I have the Ventilator intake and Stock CAT free exhaust head with Screamin Eagle slip-ons.

Is it the tune, exhaust or ?? Appreciate the input.

 

Possibly some clutch slip. Or it could be a tuning issue. No AFR line to see.

 

More than likely a bit drivetrain ****** (play) when the throttle was opened at the beginning of the run.
Not unusual for late model bikes, especially with Cushioned drivetrain parts.
Bob

 

They did install the heavy duty clutch spring. I guess I am asking if I should ignore it or try to improve on it.

 

Ask them for a dyno chart that has rpm/speed displayed. That will indicate clutch slip or not.

 

Tried to edit above— should read gear ratio/ engine speed.

 

Torque dip is most likely the pipe and the squiggles look like clutch slip. Even with the SE plate, clutch might need adjustment. Seeing the AFR line would help.