Using Low Side Output for Lean Protection

[TheBoz2]

First off I am curious if anyone has attempted this.

Second here is how I think you do it.

Configure Outputs
Select LS5(What ever Low Side Output you have available)
Check Basic Activaction(Active)
Make all Basic Feilds Active when = At least
Set Values
- Coolant = 0
- Load = 15psi (what ever value you want your protection at, must be greater than WG Spring)
- RPM = 0 (You can pick anything but 0rpm will be a catch all)
- TPS = 0% (You can pick anything but 0%will be a catch all)
- Road Spd = 0 (You can pick anything but 0%will be a catch all)

Check Functions(Active)
- Check AFR Switch

Now tab over to the Functions tab.
- O2 #1 Rich Limit = 8.01 (I dont care how rich it goes)
- O2 #1 Lean Limit = 12.01 (What ever lean limit you want to set)

If you are not using O2 #2 set 8.01 and 20.01.

Now that output switch that you just activated, needs to be wired into the ground side of your boost controller.  This should provide a constant Ground when you are in a lean condition.  The only part of this that I can think would suck is if you go rich again it will push you back to your high boost setting and get stuck opening and closing and really make your run **** poor.  However it could save your motor.

I will be testing this out in the upcoming weeks, but please feel free to provide any feedback.

[Kristopher]

That's funny, I was just replying to your other thread and talked about the Retard Switch and EBC and thought about this while typing.

Place a manual switch in line and have control of your Lo/Hi Boost with this safety. Then use your NOS map and configure it on the same switch so when the ground is cut and the EBC goes to Lo Boost the NOS map takes away the fun by adding fuel and decreasing ign timing.

[Kristopher]

Pro-EFI has a neat feature like this:
"Example 1- Lean condition - The tuner has set a lean fuel fault condition to trigger a fault at above 12.5 to 1 Air/Fuel ratio when manifold pressure is above 150kpa (7.3psi). The tuner can now go in to the fault management and set condition 1 to trigger a check engine light, condition 2 to set the boost to minimum allowed boost, condition 3 to disengage nitrous control, and condition 4 to enter a cut mode, either ignition or fuel. The tuner can now set this fault can either be released when normal operating conditions are met, held until the ignition key is cycled, or held until the fault condition is reset by the tuner."