Hi guys,

I'm looking to have my water/meth injection turn on and off with a switch, and also have the switch enable table switching on the Megasquirt. I know table switching can enable a secondary fuel and spark table, but what about EBC targets? I haven't found a secondary boost control table so assume it can't be done.

Is there any other way this would work? I have a 15psi internal wastegate actuator, a ball and spring MBC and a GM boost control solenoid with an MSPNP Gen2.

Ideally I'd like the switch to do this:

Switch set to OFF:
- Turn W/I OFF
- Run approx 18 psi
- Target 11.5AFR
- A safe spark map

Switch set to ON:
- Turn W/I on
- Run approx 22psi
- Target a leaner AFR (W/I seems to richen the mixture when on)
- A more aggressive spark map.

Any thoughts on how this could be achieved? The only way I can see this low/high switch work is if the OFF position simply turned off the EBC all together which means I'd run on wastegate pressure. I believe that would cause slower spool up times.

 

you can just wire the EBC solenoid in with the switch.
so when the switch is "OFF" the solenoid is 100% open.

edit: well apparently you already thought of that...

 

You can do it as you described, however:

a) You probably won't maintain the desired boost to redline
b) Your spool will be worse
c) Your overboost protection will be a lot higher than the wastegate boost level, meaning that if something goes wrong and you "overboost" by accident, then you will be running a leaner, more aggressive spark map in higher boost with no W/I.

I took into account all of the above when I implemented dual boost tables selectable with an external switch and boost by gear on the Enhanced MS2...right now the only MS2 on the market that does this.

 

Why not just set an output that is MAP activated at +18 psi to turn on the W/I?

 

What if you don't want to run 18+ psi?

 

Well the OP wants to run +18 psi. The way i can think to do it is run 18 psi normal wastegate and then run in a valve that blocks off the valve and loops it around a MBC set at 22 or whatever psi. Same fuel map with the WI turning on at + 18 psi automatically via a map output. The man difference however is up to 18 psi you will not have the extra spark. I know on adaptronic i can set +3 or whatever degrees across the entire map using a switch.

 

I think OP wants a "conservative" tune for DDing, and an "aggressive" tune for when he wants to go fast. Otherwise this wouldn't be a question, and OP would just run 22psi + WI all the time.

 

That's correct. I know I can run it at wastegate level but I don't want to lose the spool benefits the EBC brings. Maybe it's not possible and I should just run it at high boost all the time!