Load Based Speed Control Issue

[Rawze]

(04-27-2023 )SquareOne Wrote:  It's not absolutely necessary as I don't pull long grades like many of the guys here, I just like to bring it up high in rpm, when I'm at gross, with as little throttle input as possible. After driving my other truck and touching 1900-2000 between shifts a handful of times a week when heavy for the last 450k miles, its def an adjustment to be limited at 1800 lol.

Truck does fine just like it is, so again, not a huge deal.

Thanks for explaining, as I didn't realize the amount of adjustments required to obtain a higher rpm. I guess with anything ecm related, nothing is as simple as it may seem.

Who knows for sure why they did the X15 programs this way... the older model engines such as CM871's for example, had some extra leeway for the upper rpm limits for most tables, ect., but many of those X15 programs simply are clamped off at lower rpm on these same tables, and not just at the speed limiters.

(X15 - 1800 program on the left, 2100 program on the right. the J1939 broadcast torque settings are shown here)

just one example of many places in the program where this was done.