BoonDocker YAMAHA: Nytro Turbo User Manual
Page 12
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 12 of 20
5. The nitrous handlebar button can be used to add or subtract a preset amount of fuel for interactive tuning purposes
(see nitrous configuration section below). From the Main Menu, select N2O, set RPM and TPS to OFF, set Btn
to TUN and adjust the fuel number as desired for the test (see example menu screen below). When the nitrous
button is pressed, this amount of fuel will be added or subtracted immediately from the current settings for all
rpms and all loads.
N2O Menu in “TUNE” mode:
Fuel TPS RPM Btn
040 OFF OFF
Æ
TUN
Also consider the following:
A/F Mixture Generally EGT’s get hotter as the motor gets lean, but too lean and the temps can actually drop! It’s like
turning the oxygen up too high on a torch – as oxygen is added, the flame gets hotter to a certain point,
then gradually cools off until it becomes extinguished from too much oxygen.
Detonation Detonation often requires an experienced tuner to detect – in most instances it cannot be heard or
noticed. Careful examination of the piston and sparkplug are required. Watch for melted
sparkplug electrodes, speckling on the sparkplug insulator, or shiny or gray flakes on the
electrode which could be melted aluminum from the piston. If possible, watch the crown of the
piston (near exhaust port) for a pitted or sand-blasted look. EGT’s can sometimes read low
during detonation – heat is going into the cylinder and piston instead of out the pipe.
Timing
Timing can affect the pipe temperature. Generally if the ignition is retarded, more heat will build up in
the pipe. Too much advance may drop EGT temps, but increase cylinder temps.
Fuel
Different fuels have different densities and other characteristics which can affect your mixture and fuel
requirements. Oxygenated fuel will run leaner. Octane rating is important for highly modified motors.
Lean spots
Sometimes a motor runs hot at certain rpms and throttle positions (usually in its mid-range) no matter
what. The fuel adjustment settings can be used to richen this up, but the engine may quickly become
too rich and run erratic. Under light load conditions you can sometimes get away with running hot for
short periods of time. Under such conditions it is best to vary the throttle position often and not stay at
one throttle setting for long durations.
VI. Nitrous Tuning (for optional Boondocker Nitrous kit)
Note: Be sure to make non-nitrous (RPM-based) tuning adjustments first. Once the nitrous tuning procedure has been
done, any changes to the RPM fuel settings may affect nitrous fuel delivery. If this occurs, the nitrous tuning steps will
need to be done again.
On the startup screen (displayed when first powered on), note the message in the lower right-hand corner.
ADJ
– Configured for a nitrous system using an ADJustable or Fixed N2O pressure regulator.
FIX
– Configured for a nitrous system using a FIXed N2O pressure regulator.
NON
– Configured for a NON-regulated N2O system. DO NOT USE WITH TURBO!
Be sure that this description matches your actual nitrous system. Some internal settings and some user menus and settings
are affected by this configuration. Do not attempt to run a Regulated nitrous setup in NON mode! Please call
Boondocker if your setting is incorrect. If you do not have nitrous capability, then this configuration does not matter.
The fuel adjustment setting in the N2O menu is used to control how much fuel is added during nitrous use. The nitrous
pressure transducer input is used to automatically scale the fuel adjustment up or down from this base setting according to
nitrous pressure. However, you still must go through the nitrous tuning procedure before you can safely use nitrous.