Listen to your friend/coworker.
RBC is fine. I'm using it on a 600whp build. I also have the S2 TB as well, with a blank off plate for the IACV.
I have no real problems with idle, but my idle is also a little higher to offset when the AC engages. Usually in the 1000-1100rpm range with the AC off. If that's unacceptable to you, keep the IACV.
The IACV is only necessary to help regulate the idle between different engine loads -- such as when your AC is turned on, it keeps the idle up.
The coolant line to the IACV is more for emissions. In the winter, the car will take longer to get up to temp and so the coolant helps warm up the throttle body to get everything into closed loop.
Removing them has only ill effect on the emissions aspect. You'll get worse gas mileage while warming up the car and dump more pollutants into the air -- once in closed loop the coolant line is more detrimental as it can create heat soak issues -- bogging off the line on a hot day, type of thing.
RBC is fine. I'm using it on a 600whp build. I also have the S2 TB as well, with a blank off plate for the IACV.
I have no real problems with idle, but my idle is also a little higher to offset when the AC engages. Usually in the 1000-1100rpm range with the AC off. If that's unacceptable to you, keep the IACV.
The IACV is only necessary to help regulate the idle between different engine loads -- such as when your AC is turned on, it keeps the idle up.
The coolant line to the IACV is more for emissions. In the winter, the car will take longer to get up to temp and so the coolant helps warm up the throttle body to get everything into closed loop.
Removing them has only ill effect on the emissions aspect. You'll get worse gas mileage while warming up the car and dump more pollutants into the air -- once in closed loop the coolant line is more detrimental as it can create heat soak issues -- bogging off the line on a hot day, type of thing.
