mikeflys1

iTrader: (2)

How are the butterflies opened? Does vacuum keep them shut and then releasing it opens them? or does applying vacuum open them?

cjernigan

iTrader: (13)

You can play with the acuator, just reach in and move it. They're normally open, then they close at the stock RPM setpoint IIRC.

hustler

iTrader: (6)

with an RPM switch / shift light

/thread

mikeflys1

iTrader: (2)

Did you even read the post? I know how to control it... i was asking how it works.


Anyways i figured out my issue....on my old escort i just ran a vac line to the actuator because the vacuum would hold them closed while cruising and as soon as boost came on they'd open. Worked well and i tried doing the same to the miata but it felt choked up all the time. I thought maybe on the miata they used vacuum to open them instead but then i realized the line i used ran straight to the vac reservoir so the vics was being held closed all the time.....oops.

Fra66L

Low revs = no vacuum applied
High revs = vacuum applied via ecu controlled rpm switch.