I connected up the J1939 link from the Navistar ECM to the allison 1000 TCM. a little more permanent, and took it for a drive! i wanted to see if the ECM sent throttle info to the TCM so i could have proper downshifts.
the bus is just my fun project.. I drive it around more than my car.. and on road trips.. group outings with friends as well.. my latest projects are turning up the "heat" on the engine for more Horsepower.. putting in new injectors, and wicked-wheeling the turbo.. i'll stay mild and just go from the stock 190HP up to 250HP .. which in a short bus will be more than sufficient and still keep my EGTs down.
I couldnt get torque pro to work.. it doesnt appear to support the J1587 protocol on top of the J1708 link.. the 6 pin connector on the older style 444E / 466E engines needs an ELM325 based device and not ELM327.. I tried getting torque pro to work from the J1939 ECM to TCM link but it cant decipher the J1939 protocol.. a new device BlueFire is proimising.. the silverleaf is good but missing a lot of the Navistar specific PIDs and they dont have any provisions to directly request a PID from the data link.. I have been building my own device which will replace the silverleaf soon.. and will give me parameters such as my HPOP Data , air intake, temp, etc which are PID's the silverleaf neglects on navistar..
Also how did you like your wicked wheel? Was there a noticable acceleration improvement and did it affect your fuel economy in any way and help your egts
J1939 is a cxommunication protocol used in the Vehicle CAN bus inductry. in this bus I had replaced the old mechanical 4 speed transmission with a new 6 speed electronic automatic, for the allison 1000 trans to work it needs a throttle input as a minimum.. I had that hooked up via analog, the ECM on this vehicle I found had a J1939 integration connector, I tested it and sure enough it was sendong throttle / engine torque data and other information out of it, so I connected it up so now the transmission is using a true data link and getting real-time engine data from the ECM so to make the transmission operate MUCH better.. if you are asking about the dashboard screens, those are windows Tablets.. the one on the left is connected to the engine J1708 diagnostics port and running VMSpc software from SilverLeaf electronics, the one on the right is running EFIlive flashscan V2 tuning software and is connected to the transmission computer via the allison TCM CAN2 interface pins with J2284 (OBD2) protocol.
J1939 is the protocol that communicates between the transmission and the engine . the screen im programming on is a windows tablet with the EFIlive flashscan V2
