asi

whats the main purpose of a bac valve

dr0x

Makes adjustments to the idle according to engine load.

asi

how does it measure the engine load

SleeperZzZ

could a bac cause my car when it is hot to somtimes stumble and stall

Roy James

could.. take it off and find out

SleeperZzZ

if i take it off, what would it do, please help and tell me what im looking for it to do when its off

SleeperZzZ

and could i just unplug it?

ponykiller

Do you have A/C? The bac will raise the idle when you turn on the A/C at idle.

dr0x

Why do you want to remove it?

Ni5mo180SX

Ive removed mine. I have no accesories of any sort so I dont see any downfalls to this?

dr0x

Well you dont need it. But a stock car would, and a lot of fan boys like to rip **** off with out knowing what it is or does.

SleeperZzZ

will this cause my car to stall, i dont wanna rip it off, i just want my car to stay running, it only does it after hard driving

SureShot

Here is the deal. The rotary engine has so little torque at idle that half of the stuff on top of the motor is for idle speed control. The BAC is the main controller of idle speed but it needs help with suddenly switching loads like headlights or AC or heater fan on high. These other accessories have signals to the ECU to open various vacuum bleed solenoids to help out. That is why the idle tune up is so complex.

1987RX7guy

iTrader: (3)

ok i only have PS and the stocker fan. To get rid of the BAC I would have to lose both right?

dr0x

Maybe the fan. PS turns pretty freely and shouldnt affect much at a 850 idle.

hugues

if you have PS and you turn the wheels fully, you may stall without the BAC (there's a PS switch to tells ECU the wheels are being turned, and increase duty cycle of BAC). It may not.

I guess it all depends how healthy your engine is.

Low compression equals even less torque at idle.

Hugues -

asi

whats considered good compression, i get 50psi per chamber and 75psi for a full rotation.