Originally Posted by DrTwitch
This thread pinged my keyword search for 62mph. Is that a common governed speed? I found a 1999 Cummins w at545 that checks all our boxes on size, rust etc, but the bus depot says it won't go above 62mph and only then downhill. I assumed it was an issue with the gears and differential and since I don't want to mess with those I passed mentally on the bus.
But now I'm asking: is this top speed artificial and just a setting that can be undone?
yeah many buses seem to be limited to 62. My 1992 Ward Senator would do 62 if you gave it everything.
My shorty will theoretically do over 80. I've taken it to 75 briefly. 65 is good for me, but I do like passing power on the interstate.
In most cases with later model buses its electronically limited. The ecu has a setting for top speed. The schools have them set where they want them.
Older buses were actually mechanically governed at the fuel pump. And they were usually limited by gearing.
95% of the school buses out there are geared for mostly stop and go driving. A big component of "conversion" in my book is gearing it for the job.