S&S Cycle EZFI on 2008-09 Touring Models - Manual (Page 7)

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EZFI™ OPERATION
The EZFI system is simple to operate. A 10 position mode switch allows you to select which RPM and throttle range to tune. The 10 operating modes
are listed in Table 3. The display is turned off in Mode 0.
When you are not tuning your motorcycle, make sure the switch is in Mode O to prevent accidental changes to your motorcycle's fuel map.
The Value LED displays the adjustment percentage for the selected range. The indicated number is the percent fuel being added (positive) or taken
away (negative) from the base pulse width. The small LED to the left of the numerical display is lit when the adjustment is negative, which means the
EZFI is leaning the mixture out in that range.
The Up and Down buttons raise or lower the fuel adjustment for the selected operating range.
Advanced tuning of both front and rear fuel maps is possible when the S&S EZTune software is used in conjunction with our S&S Super Stock
diagnostic cable. These are available separately.
BASIC TUNING TIPS
Now that you have EZFI installed and understand how to operate it, you are ready to tune. Here are some basic tips to make tuning with EZFI faster
and more productive.
Take notes.
Tuning while riding is not a safe practice. If the engine hesitates, surges, or doesn’t run right, make a mental note of which operating range it is
occurring in. Just keep tabs on the RPM, throttle position (cruising at part throttle or accelerating hard at wide open throttle) and the behavior
(surging, sluggish response, missing, etc). Then at a safe spot, pull over and write down your notes.
Warm up the engine before tuning.
Starting your tuning session with a warm engine minimizes the amount of temperature compensation that the stock ECM might be adding in. It also
ensures repetitive results. If you tune the motorcycle with the engine cold, you will probably end up re-tuning it later when it’s warm.
If possible, measure what the engine is doing.
The fastest method of tuning requires wide band air fuel ratio (AFR) measurements. There are numerous stand-alone wideband systems available,
which can be operated while riding the motorcycle. Most tuning centers are equipped with wideband systems, which usually analyze the AFR
using a sensor inserted into the exhaust pipe. Either method will provide better data than “seat of the pants” interpretations of engine operation.
Knowledge of the AFR at various operating points allows you to dial in the precise fuel adjustments necessary to hit your target AFR.
Know your symptoms.
Adding fuel does not solve all running problems. Many engine modifications will require a reduction in the amount of fuel at certain operating
points for optimal tuning. Coughing or surging usually indicate a lean condition. These conditions will require adding fuel to correct. Measuring your
AFR with a wideband system will give much better results than trying to diagnose the symptoms.
Mode Switch Position Adjustment Range
0 None – display off
1 Idle, 750 to 1250 RPM, closed throttle
2 Low cruise, 1250 to 2000 RPM, 2.5% to 50% throttle
3 High cruise, 2000 to 3750 RPM, 2.5% to 50% throttle
4 Wide Open 1250 to 2000 RPM, 50% to 100% throttle
5 Wide Open 2000 to 2750 RPM, 50% to 100% throttle
6 Wide Open 2750 to 3750 RPM, 50% to 100% throttle
7 Wide Open 3750 to 4750 RPM, 50% to 100% throttle
8 Wide Open 4750 to 6500 RPM, 50% to 100% throttle
9 Acceleration enrichment
Table 3
WARNING