Water/Methanol Injection Parameters

[Dunc]

I've been doing a bunch of reading and asking around about water/methanol injection over the last few days and I've narrowed things down enough to worry about the tuning side now.

I searched here with no luck so thought I'd ask:
Questions:
1.) As seen below, do I have to adjust the fuel/ignition compensation values? Or can I leave them all at 0 and then just adjust the fuel/ignition like normal in the tables? Basically is the "0" just a default value and if I don't touch it then I can adjust them in the regular tables and be good to go?
2.) If I put a negative number in the fuel compensation table, that will take out -X% right?
3.) For the input: I am going to select always on. How do you determine if it needs to be "invert input?" I am assuming leave that unchecked.
4.) For the output: I am going just use A10 (Extra output) since I don't want to mess with the others. Again, determining "invert output?" Reading about the system I'm going to most likely get, there is only a power/ground on the pump and everything else is pre-wired internally. I assume that I should wire the pumps power wire to the A10 pin and just have it turn on/off through the conditions tab. Should I still put a relay between the pumps power line and the ECU pin or is the pre-wired in-line fuse sufficient?

[Spunkster]

From the Help file within Smanager (Help, Contents):

These parameters allow the ECU to control the use of nitrous oxide, water/alcohol injection or to function as a general purpose auxiliary output.

Function



Selects the main function of the nitrous/aux output.

Input



Arming Input - specifies which ECU pin is used to arm the nitrous/aux output.

Invert input - reverses the state of the arming input.

Disable if check engine code - disables the output when there is a check engine code.

Disable on full throttle shift & launch control - disables the output when the full throttle shift rev limiter or launch control rev limiter is in operation.

Output



Output - specifies which ECU pin is used for the output.

Invert output - reverses the states of the output.

Conditions



All the conditions must be met in order for the output to be activated.

Engine speed - specifies the minimum and maximum rpm.

Engine load - specifies the minimum and maximum engine load.

Throttle - specifies the minimum throttle opening.

Vehicle speed - specifies the minimum vehicle speed.

Air temperature - specifies the minimum intake air temperature.

Note that not all these conditions will be available, depending on the function selected.

Fuel & Ignition




The above example will remove fuel and retard the ignition timing by 4 degrees when activated.

Output Control - specifies which ECU pin controls the nitrous solenoid. Important: the ECU cannot sink enough current directly to control a solenoid. A relay must be used between the ECU and solenoid to prevent damage to the ECU.

Conditions - specifies the conditions which must be met before the output is switched on.

Fuel & Ignition - specifies changes to fuel and ignition when nitrous is activated.

The maximum retard is 40 degrees, and the ignition timing can be retard to a maximum of 10 degrees BTDC.

Do not make nitrous changes without using a wideband lambda meter to determine the correct air/fuel ratio. As a general guide, the following extra fuel is necessary:

Nitrous Jet
Fuel Value

0.24
200

0.32
350

0.47
850





With nitrous control it is possible to remove fuel and/or advance ignition timing by using negative values. This is useful when using water/alcohol injection.