BoonDocker YAMAHA: Apex Turbo - Manual (Page 10)

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 05-07-07 Page 10 of 16
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.
Warning: Only adjust the control Box settings according to the steps below. The best way to tune an
engine is with the use of an oxygen sensor and gauge (available from Boondocker). This adjustment
process should only be performed by an experienced tuner. If you are not an experienced tuner, find
someone who is. Remember, safety first!
The steps below should be performed with a full nitrous bottle. On systems without a nitrous pressure regulator, make sure
the bottle is at proper operating temperature (70-90deg F) and pressure (700-1000psi). Make sure the engine is at normal
operating temperature.
Do not exceed 2 seconds of nitrous use until the fuel adjustment is complete and correct.
1. First configure the nitrous system for Button use. The next chapter will describe different ways to configure your
system for nitrous activation, but we’re going to shortcut that for now.
Select N2O from the Main Menu, move the cursor so it is under Btn and press the Up Arrow until N2O. Press
“SEL” to return you to the Main Menu. Select N2O from the Main Menu again. Look at the N2O Menu to be
sure that TPS and RPM are turned OFF.
N2O Menu for Button Activation for initial Nitrous Tuning:
Fuel TPS RPM Btn
Æ
040 OFF OFF N2O
2. Select N2O from the Main Menu.
Fuel TPS RPM Btn
Æ
040 OFF OFF N2O
Select Fuel. The following screen will appear:
N2O Fuel Delay
Æ
050 000
Increase the nitrous Fuel adjustment setting until you notice a drop in the power increase when using nitrous.
Oxygen, EGT, and rpm readings can be used to help determine when you are too rich. Be sure you have reached
this point before proceeding. Note this adjustment setting.
3. Only after step 2 or 3 is complete, start reducing the Fuel setting. Continue reducing the Fuel setting until a
maximum power increase is obtained. Again, note oxygen, EGT, and rpm readings, and do not exceed 2 seconds
of nitrous use which is just sufficient to get a good reading. A useful technique is to accelerate, allow rpm to
stabilize, apply nitrous, and notice maximum rpm, and if available, O2, and EGT readings.
If the Fuel is reduced but no power increase is noticed from the previous setting, this means you are lean. Note this
adjustment setting.
4. Increase the Fuel setting back to where it was before no additional power increase was noted in step 4. This
setting should be somewhere between the rich and lean settings. It is best to stay on the rich side.
5. After this adjustment is made, if the engine does not run perfectly smooth when using nitrous, do not use it! If the
exhaust note does not sound clean, the cause is likely detonation, which can quickly destroy the engine. Use
higher octane fuel, add more ignition retard, reduce the engine’s compression, or reduce the amount of nitrous
(see instructions for changing nozzles) before using nitrous again.
Note 1: The RPM and Nitrous fuel adjustments are summed. Therefore, any changes made to RPM fuel settings will
affect the quantity of fuel delivered for nitrous. Therefore, for example, if the 7800 HI fuel setting is decreased
by X amount, you need to increase the nitrous fuel setting by X amount in order to get the same total fuel delivery
for nitrous.
Note 2: After initial tuning, any new performance enhancements to your engine will require re-tuning the EFI and nitrous
fuel delivery.