[2SS Capt]

Originally Posted by KingLT1

MAF is airflow/ fueling, Timing is torque. The E92 ECM is torque based. If the idle airflow changes, then the reported torque will change and the ECM will alter timing to compensate.

I am not saying this will happen on Mamos ported 87. I am just saying be sure to check your idle timing after install to verify so you don't burn up your cat's because I have seen other TB's cause low idle timing.

I am in the process of dealing with this on a 2016 SS with another brands ported 95mm tb.

Edit* was pointed out that Brand "x" throttle body has a Notch in the bore and Mamos does not. So that might be the kicker for keeping the ECM from pulling timing. I know Prays ported 87's never had issues and they didn't have a notch in the bore.

Thanks to KingLT1 for his updated comments, I "think" this is the area he is referring to that is allowing the idle to go too lean... Literally there is no way to cut off the air from that area...

Brand X allows an uncontrolled flow of air at idle, potentially leading to a possibly lean idle... And needing a tune to run properly (which is what KingLT1 was referring to...) I think the Tony Mamo TB which is "Stock" at the idle point will not have this issue...



No "notch" on the Tony Mamo TB, leaving idle exactly stock...