GrahamC

iTrader: (4)

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.

soviet

iTrader: (10)

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...

Reverant

iTrader: (10)

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.

triple88a

iTrader: (2)

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

Reverant

iTrader: (10)

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

triple88a

iTrader: (2)

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.

thenuge26

iTrader: (2)

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.

GrahamC

iTrader: (4)

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!