reset cruise to rpm??

[Jack_Berry]

does anyone know if it is possible to reset the cruise to rpm instead of mph? truck has no problem holding 2k up the hills but the computer goes crazy down shifting to make 62 mph. right now i cut off the cruise and maintain the 2k but it would be nice to have the cruise recognize the rpm instead.

any ideas?

 

[Turtle]

Can't be done without reprogramming the ECM, and it would take a significant reprogramming. It would be nice of the cruise controls could be set for constant speed, constant RPM's, or constant MPG. But they don't work that way.

You could, in theory, do some fancy electronics and rerouting of some sensors, like the MAP sensor, to have the cruise control get its information from the MAP, thereby having the cruise keep a constant engine load rather than a constant speed. But if you did that you would have to be able to program some kind of upper and lower limits on the engine load to keep the varying speeds within acceptable limits even on slight grades.

I'm sure it's a mod that been done, or at least tried, that's out there on the net somewhere. But manufacturers are more interested in the Adaptive Cruise Control where it also uses forward looking radar to adjust the cruise to maintain a safe following distance of the vehicles in front of you.

 

[moose]

You can solve this problem by adding a programmer to your Van .

here's the one i like : (many others to choose from )

http://www.xtremediesel.com/search.aspx?manufacturer=3&gclid=CLzJjL3nrJoCFRIeDQodBhvEcg



Moose.

 

[greg334]

The reprogramming has to do with the actual code within the ECM, not something that is done with an after market programmer. Ford, like Cummins protects that code and the complexity of the code is not something that I would want some hack messing with. So I would say that you can talk to Ford and ask them to come up with a solution, which they may already have (stationary engine applications use a PTO setting).

Also Turtle, they do have a feature for MPG on one truck engine that can be setup by the factory but not talked about yet, you set the speed range and it selects the right speed with the load for the best mileage.

 

[moose]

The reprogramming has to do with the actual code within the ECM, not something that is done with an after market programmer. .

Why not ?

it's working very well on my power-stroke 6.0 !
it's on the fly programing , you tell the motor how match HP you need now - and that's what you get .

JB problem was down shifting when approaching a hill , adding some get-go on the fly will keep that engine alive .
you can add up to 100 HP !!!!
i found that adding 15 works well when loaded . and still get the same Fuel millage .

you can call : 1-888-DIESEL4 , for a free Tec support .and applications .




Moose.

 

[greg334]

Sorry, I should have detailed this, the code I am talking about is different from the code that is used to change the fuel maps. Fuel maps are created to cover specific app (diesel ecm with manual trans is different from a diesel ECM with an auto) and the ECM has a section that can be flashed to change the maps, even on the fly but some of the code is embedded, even part of a componet on the board and can't be changed.

There are a lot of small little routines within the code to do some small functions, like the PS compensation routine that is common to a lot of vehicles today, the PS pressure sensor that reaches a certain PSI, the ECM increases the fuel to compensate for the use of power at or near idle sop the engine doesn't stall. Cruise control is a routine within the code that is setup specifically for MPH and like the PS compensation routine, it is not easily changed or should be by anyone outside of the manufacture.

Why?

Because these routines are sometimes used by other parts of the code to do other functions, like the PS compensation routine may be used in part to help with when you shift the truck from reverse to drive and so on.

 

[Jack_Berry]

thanks moose. i know i could add pedal but you know how it is.....eyes focused, hands on the wheel, mind not reading the terrain......(on the phone, doing a crossword, a sudoko, making a sammich, trying to scratch an itch with the seatback, there was a flood, a hurricane, my tux didn't come back from the cleaners an old friend came in from out of town....it wasn't my fault!!!) with the nature of my engine i don't think i want to add hp.