Ecodiesel: 19.46 MPG Towing 7,020 lbs.
dieselpowermag.com: Ram 1500 Ecodiesel vs. Ram 2500 CTD comparison (dated Feb 24,2014). dieselpowermag.com link In this comparison the Ram 1500 Ecodiesel got 19.46 MPG towing a 7,020 lb. load on...
Forum Discussion
jus2shy wrote:My VM 2.8 would need the ECM reprogrammed if an injector is changed out. Maybe that answers your question.mich800 wrote:Lspangler wrote:ScottG wrote:
Almost too good to be true. I wonder if this was hand calculated or were they going by Rams infamous Lie-O-meter.
Off topic but I read an article recently from some engineers that stated hand calculating was inaccurate due to never knowing when full is full and how much gas volume changes with temperature.
The engineer stated the computer needs to know exactly how much fuel it is injecting into the engine at all times in order to meet emissions so it is much more accurate than hand calculating.
I know that's counter the prevailing thought on the net.
I was hoping RAM would increase the payload to at least 10% over the 1/2 ton trucks rating but the 3900 pound axle rating stays even though the engine is heavier.
Linc
But that is with a standard injector flow rate on a multi dimensional fuel map. There are many variables and manufacturing tolerances that will impact that. Personally, the dic on the vehicles have driven have been fairly close but I can see how some can be just inaccurate due to variations on the measured variables.
I don't know if the VM motor does this, but Cummins actually has a flow-rate for each individual injector. I believe Ford does the same as well, I'm unsure of GM. But the ECM's actually vary injection events to suit the flow rate of each injection to have even contribution to engine power. I've been tracking my EVIC accuracy since I bought the truck. Except for a few spikes, average error is right around 3% off from hand-calculated.
