870 turbo overspeed cel

[Unilevers]

it should peak at 40 on a 870 at 650HP. 870's commonly spike slightly then settle back down as the air actuator takes time to respond. if it spiked to just over 40 then settled back to 39-40 i wouldnt worry thats just a 870 being a 870. if it spikes and stays over 40 then i would be looking for a leak, stuck actuator, bad controller, bad EGP sensor, or your just running in high altitudes and need a adjustment to bring it down some.

feel free to call/txt me if you need some help.