Is it good idea to remove BAC and how will it affect a/ac control and idleing

does the bac valve air have to go after the mass air flow sesor or can it go before.

i moved my mass air flow sensor after the intercooler

but the air from my bac valve is going into its stock locaton
the idels rises and lowers like it is breating and makes a funny little sound when it rises up

is this something to do with bac valve air supply coming from before the afm

 

No.

The BAC valve is the ECU's main way to control idle speed. Without it, any load on the engine (A/C, electrical load via the alternator, etc.) will drastically lower it's idle speed and may cause it to stall.

ANY air going into the engine MUST be metered. So it connects after.

See above.

 

Ok all US spec RX7 BAC valve have idle adjustment screw as referred to in FSM but JDM rx7 engine BAC valve have no screw. i checked about 5 RHD jdm rx7 and neither of them have screw on the BAC valve

I there a difference in the US upper air intake and JDM upper air intake in relation to BAC valve placement, opening or holes

i have a JDM upper air intake i bought a US spec BAC valve. The valve is operating coorectly i will move the air connection to after the Mass flow sensor

to see if taht helps my idling situation

u are right with ac on the car almost stalls and has at times

 

hey guys anyone want to confim on the above post who here has jdm RX7 RHD car

 

so do jdm and us upper air intake have differnt holes for BAC valve

 

no...
BAC placement is the same on usdm and jspec.

 

yes placement is the same my questionis regarding the hole s in the upper intake manifold are they the same