rv_safetyman-More power in cruise?

[buswarrior]

Again, Brian, the interaction of Jakes/Cruise and the transmission may be programmable.

Speed differentials between coasting on cruise and Jake application, all the way to forced downshifting of the transmission for added deceleration, and everything in between.

I am not fond of some fleet manager or technician, whose focus is not on smooth operation for the customers, making decisions for me as to how the machine is going to automatically function, whether conditions warrant it or not.

It isn't every tech who is sufficiently intimate with all of these more obscure settings, especially on the older versions. Make them quote chapter and verse as to whether your rig has the ability to change or not. No proof, suspect every word.

I'm tired of lies and half truths instead of a simple "I don't know" from the people who are paid to help us.

happy coaching!
buswarrior

[belfert]

BW, a lot of stuff can be changed by Detroit, but every time I call and ask about changing something they want anywhere between $250 and $600 and sometimes more to change it.  So far nothing has been worth that much money to change.

If the cruise and Jake are both enabled, the DDEC will command the Jake to engage any time the speed gets more than 2 to 3 MPH above the set point.  The transmission automatically downshifts one gear when the Jake engages.  The problem is the Jake will only engage for 5 to 10 seconds and then turn off causing the tranny to quickly downshift and then upshift.  This cycle will usually repeat itself a few more times every 5 to 10 seconds.  I cannot believe this good for the tranny to constantly downshift and upshift.

To combat this I normally turn off the Jake when using cruise.  I don't believe it bothers my passengers, but it bothers me as the owner because I would prefer not to rebuild the tranny for big bucks.

[luvrbus]

I have no idea how many hp setting you can program into a DDEC ECM but it must a bunch as Davenport can set his series 60 from 515 hp to 650 hp from the laptop in his Eagle 



good luck

[TomC]

I don't like the automatic downshift with the Allison when you activate the Jake brake.  This is also a feature you can have turned off.  I like to be in control of whether or not I prematurely down shift the transmission-not the transmission doing the thinking for me.  When turned off, then when the cruise control is on, the Jake brake comes on and the transmission stays in the same gear without all the drama of the down shift.  Good Luck, TomC