BoonDocker YAMAHA: Nytro Turbo User Manual
Page 6
BoonDocker – 1585 Hollipark Dr. Idaho Falls, ID 83401 – 208-542-4411 / 877-522-7805
www.boondockers.com – email:
– fax: 208-524-7381
Revised 2-13-08
Copyright © 2004-2008 by Boondocker
Page 6 of 20
Making RPM fuel adjustments
M1L ÆId 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 Section 2 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. The effect of the 3000rpm setting decreases until 5000rpm, while the effect of the
5000rpm setting increases 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
The fuel added or subtracted in each RPM region depends upon engine load. A different fuel number
can be entered for each load (low, medium, or high). 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 (from the stock
ECU) 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 from the stock injectors. 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/mixture readings, and fuel pressure when running with engine modifications that require a
lot of additional fuel!
1.b
Turbo Tuning
– There are two turbo adjust screens (examples shown below). These are in the Fuel Menu and
appear following the four RPM screens.
Turbo screen1:
M1U -4 0 +4 +8
TboL 00 00 00 00
Turbo screen2:
M1U 12 16 20 24
TboH 00 00 00 00
Use the Left/Right Arrow keys to switch between boost ranges. Use the Up/Down Arrow keys to change the fuel
settings at a given boost pressure. Go to the next adjustment screen by pressing the “SEL” button. After pressing the
“SEL” on the second turbo adjust screen, you will go to the accelerator pump menu.
The first turbo screen is for adjusting fuel for low boost pressures (-4 to 8psi), and the second is for high boost pressures
(12 to 24psi).
Note that in the upper left-hand corner, the current Map number is shown (M1) along with whether it is locked (L) or
unlocked (U). Across the top of each screen is the boost pressure range. Across the bottom of each screen is the user-
adjustable fuel number. For any boost pressures between the values displayed, the actual fuel quantity is computed
proportionately. The value at -4psi (-2”Hg) is used for any pressure below -4psi. The value at 24psi is used for any
pressure over 24psi. Therefore, do not allow a boost pressure over 24psi as it will run too lean.