Cummins 605/2050 immediate RPM drop issue

[WICT800]

(10-21-2021 )tree98 Wrote:  I don't know how familiar you are with new emissions engines but they drop rpm very fast because of back pressure that the old engines didn't have. I have a 9 liter cummins that you have to rev out the max and shift quickly or you'll miss the gear because it's dropping rpm so quickly. Not saying this is your problem just throwing it out there.

I’ve driven a few and mine is certainly a step above anything I’ve seen, a few of my buddies have also sent me videos of there CM2450 trucks and theres will rev up and down at a similar rate, my air throttle will slam shut dropping the RPM as if the Jake brake was on, we’ve also connected to it with Cummins insight and it shows air throttle valve position changing while it does it.