2013 Challenger rt auto, 392cid, cams (not sure what kind of cams) whipple 14psi
This vehicle has a stumble at around 2500 rpm and between 47 and 48 mph. It will also do it at the same RPM at around 25mph and the customer says he can get it to stumble the same way at around 3500 rpm . This is with part throttle and is easier to get it to happen when going up a hill. To me if feels like maybe the bypass valve is possibly closing and opening causing the stumble. When I log it, I dont see anything that stands out at me. The map KPA stays around 75kpa and you can see the RPM osilate a little when it happens but other than that I dont really see anything in the log. At this point I'm not sure what to try next. Other than this issue the vehicle drives great. Wot is great, and you can drive through the rpm with more or less throttle and not have a stumble but when you get it just right is will stumble at that rpm.
In the log the the stumble is very hard to see but you can see the RPM fluctuate toward the end of the log between 47 and 48 mph at around 2500 rpm.