I just put in a new black box and hooked up all the vaccuum lines to run my secondary butterflies this past weekend on my gsr motor… I’ve asked around a little and haven’t got any answers… Basically, how can i find out if the secondary’s are working… I don’t feel much of a difference when I get up into high RPM’s but that doesn’t mean there not working. Thanks
From what I can recall and the quick research that i did, Your power gain should have been down low. The secondaries when inactive are normally open. This creates a shorter intake primary for increased efficency at higher RPMS.
When functioning properly on a stock ECU VTEC should engage at 4400 RPM and your butterflies should open at around 5600 RPM. With an intake and not a rediculasly loud exhaust you should be able to hear a distinct change in engine tone at each of those RPM points.
So to change what your looking for, you shouldnt feel a difference at higher RPM only lower RPM.