Buell XB 2010, Service Manual

Page: 521 / 714

6.16 INTERACTIVE EXHAUST SYSTEM
GENERAL
NOTE
The interactive exhaust system is standard equipment on the
XB12 models only.
See Figure 6-57 . An electronically controlled actuator opens
or closes a butterfly valve (1) that controls exhaust flow in a
multi-chamber muffler.
The ECM monitors engine speed and throttle position while
alternating flow paths between the chambers to adjust back-
pressure optimizing torque and horsepower for the riding con-
dition.
1. At low RPM with a wide-open throttle, the valve (1) is
opened to reduce back-pressure so the engine can gain
RPM quickly. The exhaust enters (2) the muffler and flows
(3) through the open valve (1) into chamber C (7) and then
exits (8).
2. In the mid-range, the valve is closed to increase accelera-
tion torque. The exhaust flows (4) through chamber A,
around to chamber B and then through chamber C and
exits.
3. At high RPM, the valve opens again to maximize
horsepower. The exhaust enters (2) the muffler and flows
(3) through the open valve (1) into chamber C (7) and then
exits (8).
1
8
5
4
1
2
4
3
4
6
7
4
4
3
sm00374
5. 1. Chamber A Butterfly valve
2. 6. Exhaust in Chamber B
7. 3. Chamber C Valve open (exhaust flow - chamber C)
4. 8. Valve closed (exhaust - chamber A to B to C) Exhaust exit
Figure 6-57. Interactive Exhaust System Muffler
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2010 XB Service: Electrical 6-47