One of the few things that annoys me about my 6MT is a delay after I lift off, but before deceleration/engine braking kicks in. I asked about it a few years ago and it was described as 'RevHang' (apparently it's common with civics?) and is in place to help with emissions.

Example: Moderate accelerate in 2nd (not WOT) to 5k rpm and suddenly lift off completely. The car seems to wait ~1/2 second before actually decelerating, or so I though.

A few days ago I realized that I could log this effect with my Osiris/Cipher to get a better picture of what is going on, but I guess I don't really know how to read the results.



Whats going on in the highlighted area? I see the Accel pedal lift, then the throttle close, then an RPM spike that lasts 0.6 seconds. After the 0.6 seconds the car decelerates like I expect.

Anyone know whats going on here? Is there a way to remove this effect using Osiris?

 

What's your idle sitting at?

 

Idle has been raised to 700rpm. In a different thread it was suggested that the throttle sensor position be reset, but that yielded no difference in the graph.

On the graph I notice a very slight reopening of the throttle, but I can't imagine that would be enough to cause the rev spike since the amount of throttle needed to sustain the current RPM level was much higher before lifting off.

This one still has me baffled.

 

I notice i get a little rise from the revs since my idle increased after messing around with my exhaust, i'm currently finishing a 24 hour battery disconnect to try and get it to stay down.

Idle relearn was not being remembered.