BoonDocker YAMAHA: Non-turbo Control Box Nytro - Manual (Page 4)

BoonDocker – 1585 Hollipark Dr. Idaho Falls, ID 83401 – 208-542-4411 / 877-522-7805
www.boondockers.com – email: [email protected] – fax: 208-524-7381
Revised 10-31-07 Page 4 of 16
RPM Regions:
Up to seven RPM regions are pre-programmed in the control box which allows fuel adjustments to be made at specific
RPM settings (5 regions are shown above). Whenever the engine RPMs are between these specific regions, the fuel
adjustment will be the result of the adjacent RPM fuel settings blended together. For example, the fuel setting at 5000
RPM is centered at 5000 RPM, but this value also has an effect on fuel whenever RPMs are above 3000 RPM and below
6700 RPM (the two adjacent settings for this example). Suppose the 3000 fuel setting is at “4” and the 5000 fuel setting is
at “8”, so if engine rpms are at 4000 the actual fuel adjustment made will be ½ of “4” and ½ of “8” which is “6”.
Load Ranges:
Each RPM Region is split into 3 load ranges: LO (low), MD (medium), HI (high). Each load range is roughly equivalent
to the throttle position divided into thirds: LO is closed throttle (idel) to 1/3 open, MD is 1/3 to 2/3 open, and HI is 2/3 to
full open. During light-throttle conditions (slow cruising or deceleration), the LO RPM settings will be used. During part-
throttle conditions (normal or faster cruising), the MD RPM settings will be mostly used. During heavy-throttle conditions
(accelerating or heavy load operation), the HI RPM settings will be used.
Fuel Screens (RPM Adjustments)
M1L
Æ
Id MD HI
3000 00 00 00
M1L This displays current map that is being used – in this case, M1 stands for Map1, and L indicates the map is
Locked (changes are not allowed). Five possible fuel maps can be used. Each map consists of all the fuel
settings for a particular setup. If the map is Locked, the settings cannot be changed and the up/down buttons
have no effect. If U is displayed, the map is Unlocked, adjustments can be made to any setting and these
changes will be automatically saved to the selected map. Refer to the Load/Copy sections for more details about
how to Lock, Unlock, Load, and Copy different Maps.
3000 This is the RPM Region for the fuel adjustments on this screen. For this example, this screen’s adjustments will
be centered at 3000rpm. There can be from 3 to as many as 7 rpm regions depending on the program version.
The effect of the 3000rpm setting tapers off until 5000rpm, while the effect of the 5000rpm setting ramps up as
rpms go towards 5000. The other regions work similar to this.
Id (3000 screen only) This adjustment is for Idle only (up to 2000rpm).
LO / MD / HI These are the engine Load settings for each RPM region. Since engine load is directly related to
throttle position, each load range is equivalent to the following approximate throttle positions:
LO = 0 up to 1/3 throttle
MD = 1/2 up to 2/3 throttle
HI = 2/3 up to full throttle
00
Fuel adjustment value. Each setting can go from –99 to 127. Refer to the EFI tuning section for general tuning
guidelines. A value of 00 means no fuel adjustment will be made and the original injector signal will be passed
through unmodified. Negative values will reduce the fuel. Positive values will increase the fuel.
Note 1: Each number is equal to about 1/2% of the total available fuel. The maximum available fuel will vary
with each engine as well as with elevation and air temperature.
Note 2: It is possible to max the injector (duty cycle > 100%) before the adjustment setting is maxed! Pay
careful attention to EGT’s, O2 readings, and fuel pressure when running with engine mods that require a lot of
additional fuel!