I understand how to wire up the VDI solenoid along with the 5th and 6th port actuator solenoid by using a PWM output, but im unsure how to plum the vacuum lines for each solenoid. I've looked up multiple schematics for the stock vacuum (rats nest) set up to only find my self more confused. I'm sure its simple and making it harder than what it actually is. Any help will be much appreciated!

 

they both get a pressure feed coming from the ACV on the pipe that goes to the air pump, then the solenoids and then the actuators. the Mazda plumbing is complex because the solenoids are on the opposite side of the engine, so its got to go over and come back.

 

So technically I can run one vacuum line from the acv to both solenoids correct?

 

it is a pressure feed, but yes, it just T's.

 

Ok got that, now my final question which should close all this up. Do the VDI solenoid and actuator solenoid switch open at the same rpm or different rpm's? If I am not mistaken the actuator solenoid is suppose to open at around 5200 rpms but im unsure about the VDI solenoid, I could be mistaken on those rpm numbers as well.

 

the stock system opens them by load and rpm, which the haltech can't do. @wot the 6pi opens are ~3400, and the VDi is @5250.

its really easy to tune these. if you're on a dyno make a run with the 6pi open, and a run with them closed, and lay the graphs on top of each other, where they cross is where you should switch them. the VDI is the same, make a run closed and a run open, and see where they cross.

the budget slide ruler way would be to take a datalog, and compare how much time it takes for an RPM increment. so 3000 to 4000rpm with the 6 ports open may take 12 minutes, but with them closed it takes 11, you want them closed.

 

Gotcha! Thanks for all your help