Hondata

'07 Civic Si, ran a MAF-based tune for a little under a year. Under the 'throttle' menu in calibration there was a check box for overrun throttle opening. I ran with this box unchecked and found it eliminated my rev hang when shifting.

Recently installed a race header and switched to a MAP-based tune. The throttle menu in the race tune does not have this check box. I am having issues with rev hang again. Not sure what to do. Please advise.

Make changes to the overrun fuel cut delay in the fuel section. Decreasing the time should help.

Or, reduce the values in the 'ignition timing advance when throttle angle is zero' map...