Nomad2day
Longhair Redneck Geek
The S&S system is very adaptive to your needs though with the base map supplied by BDM. I have asked but never got a straight answer on how much change it can compensate for, as in what cam and exhaust can it handle. If we look at the data and what the spec's say on the systems abilities, we can make a educated guess.
Mine has a 9 pin D port on the module to communicate with. I will write up a how too with pictures to check your system when you have a check engine light on and what cable pin out. But lets get to the bare bones of the system and what it does.
Here is a quote from S&S on the system......
More extensive modifications that
change the power output of the engine by more than
about 20% require a new base map. I would think that you should be able to do some things to wake up your bike within those parameters and it learn and compensate for it. How big of a cam, I don't know but it would not take much to wake one up and get it off the porch.
CLOSED LOOP VFI...
can automatically compensate for the following
modifications as long as the change in horsepower
output is less than about 20%.
■ Displacement
■ Cam change*
■ Exhaust change*
■ Head Porting or aftermarket heads
■ Gear ratio
* It should be noted that the cam and exhaust
system must be appropriate for the displacement,
compression ratio, and intended use of the engine.
No amount of tuning will entirely correct for a poor
cam and exhaust choice.
On the engines missing when it gets hot is basically covered here.
S&S module also has engine
overheat protection built into the software. If the
cylinder head temperature reaches a predetermined set
point, the module begins skipping sparks. This
noticeable misfire not only alerts the rider that the
engine is overheating, but also cools the cylinder heads
with unburned fuel. If the temperature continues to
increase, the missed sparks become more frequent. This
alerts the rider that the overheating is becoming more
severe, and provides more cooling to the cylinder heads.
The third stage of overheat protection is very noticeable,
and will cause the engine to run badly at idle. The
overheat protection function can not be disabled, and is
one of the factors that allows S&S to offer increased
engine warranty on complete engines sold with the VFI
system.
I will continue to add items of interest as time permits and hope others chime in with there experience and make corrections where needed.
Neil in Tenn
Mine has a 9 pin D port on the module to communicate with. I will write up a how too with pictures to check your system when you have a check engine light on and what cable pin out. But lets get to the bare bones of the system and what it does.
Here is a quote from S&S on the system......
Code:
The S&S VFI module still evaluates data from the five
standard sensors: crank position, MAP, throttle
position, air temperature, and cylinder head
temperature, and it still requires a base map to run.
However, when operated in the closed loop mode, S&S
VFI becomes an adaptive system that adjusts fuel
delivery in real time, by sensing the level of the oxygen
in the exhaust gases. The additional data provided by
the oxygen sensors, allows the system to automatically
correct fuel delivery to maintain the optimum fuel/air
mixture over a wide range of operating conditions.
Closed loop VFI can even compensate for minor
modifications to the engine configuration
automatically. More extensive modifications that
change the power output of the engine by more than
about 20% require a new base map.
Code:
The module starts with a base fuel map, and makes
adjustments based on feedback from the oxygen
sensors. S&S supplies base maps for several
displacement groups, which can be used as a starting
point to get a bike up and running. The S&S closed
loop system then tailors the map to the specific
requirements of your engine, while you ride. Fuel
map changes are temporarily stored in the cylinder
offset files, and can be made permanent by using
the "map merge" function of the ProTune II
software. In this way the corrections that the
module has "learned" become a permanent part of
the tune file, and will not be lost if the battery is
disconnected during service work.change the power output of the engine by more than
about 20% require a new base map. I would think that you should be able to do some things to wake up your bike within those parameters and it learn and compensate for it. How big of a cam, I don't know but it would not take much to wake one up and get it off the porch.
CLOSED LOOP VFI...
can automatically compensate for the following
modifications as long as the change in horsepower
output is less than about 20%.
■ Displacement
■ Cam change*
■ Exhaust change*
■ Head Porting or aftermarket heads
■ Gear ratio
* It should be noted that the cam and exhaust
system must be appropriate for the displacement,
compression ratio, and intended use of the engine.
No amount of tuning will entirely correct for a poor
cam and exhaust choice.
On the engines missing when it gets hot is basically covered here.
S&S module also has engine
overheat protection built into the software. If the
cylinder head temperature reaches a predetermined set
point, the module begins skipping sparks. This
noticeable misfire not only alerts the rider that the
engine is overheating, but also cools the cylinder heads
with unburned fuel. If the temperature continues to
increase, the missed sparks become more frequent. This
alerts the rider that the overheating is becoming more
severe, and provides more cooling to the cylinder heads.
The third stage of overheat protection is very noticeable,
and will cause the engine to run badly at idle. The
overheat protection function can not be disabled, and is
one of the factors that allows S&S to offer increased
engine warranty on complete engines sold with the VFI
system.
I will continue to add items of interest as time permits and hope others chime in with there experience and make corrections where needed.
Neil in Tenn
