Load Based Speed Control Issue

[jakebank]

Hi all,

First post but I’ve found a lot of really great info on here over the last couple months. I am having an issue with the Load Based Speed Control on my ISX. A little bit of background, I have a small dirt trucking business and have always ran Cats. This is my first ISX and have really enjoyed it so far. The motor in my truck lived a previous life in a FedEx Freight truck. It’s a CM870, CPL 8520, 400ST. I have it tuned to 500/1650 and it’s been great pulling a belly dump train. The issue I’m having is with the LBSC. I have had my mechanic hook it up to Insite and it will not let us change the setting to anything over 1800 rpm. Being as I’m an O/O I’d really like the dummy controls to be turned off as there are time when we are grossing 129,000 that you need the motor to get a touch higher than 1800. Is there something we are missing in order to change this parameter? Like I said, insite will tell you that anything above 1800 cannot be set on this ECM. It’s a brand new ECM that was put on the truck by a reputable shop when I bought the truck. The tune came from Cummins and was done by the same shop. I’m sort of grasping at straws at this point, anyone have any ideas?