I have a vehicle that was build with a Chevrolet performance harness and ECM kit, and a Chevrolet performance supermatic TCM controller and harness . I am over trying to get the blueprint engines 376 ci ls3 and a locally built 4l65e to work/tuned correctly . I cant control torque management or get the TCM tuned to work properly , no help from Chevy Performance and no one local or I can tune the TCM with the program and software provided by Chevy performance. HPtuner wont work to tune it and i don't get much of anything on the ecm side that will help. I was hoping to find a factory ecm and tcm to install and tune with HPtuner just don't know what direction to go in. I believe the ecm is a e67 style and the TCM is Chevy performance "supermatic" controller . main problem is trans pressure seams to high (175psi to 225 at times), it slams into drive and reverse at a idle of 900 to 1000rpm when shifting into gear, and shifts way to fast it shifts into 2nd as soon as you start rolling and in 4th by 35mph. vehicle has had 3 transmissions and couple different stall converters up to 3000 and nothing influences my problems. after consulting several transmission builders the verdict is the tune has to be causing these problems. Only other thing i can add is the engine randomly lopes only at idle only in gear and influences trans pressure but then randomly will idle smooth with no lope or bucking( it jumps between both ). hoping i can get away from Chevrolet performance modules and use HPtuner to do so . Any help would be greatly appreciated been trying to work this out for over 2 years.
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