Attention: TDR Forum Junkies 
I have been having a power problem with my 6.7. The truck is modified with the following items. 60HP BD injectors, BD Screamer turbo, 5" turbo back ex, upgraded piping and a custom Duralite intercooler with a BD intake elbow. Fass 95GPH pump and filter assy. Including a custom pickup in the Titan 60 gal tank...
The truck starts and runs great. It has 270,000kms and has been a reliable work horse. I have been working through custom tunes using EFI Live for many years. The issue is that when it hits fifth gear at 55-60 MPH it falls flat. First through fourth it pulls hard. Once it hits fifth, its like I just added 20klbs to the load... EGTs are down to 8-900 from the typical 11-1200 and rail pressure is down to 19-22,000PSI. The commanded value at that point in the tables is 28-30,000. In 3rd and 4th, seeing the commanded pressure of 30-31KPSI. But its pulling so hard it doesn't stay there for long before it shifts. I have changed out the fuel filters (still using the engine mounted fuel filter) and am confident that its not a delivery issue. 3rd gear lockup will break the tires loose when it hits!
What am I missing?? The CP3 is stock and still the original part.
The current tune is for a mix of performance and mileage. Slight smoke if the throttle is jabbed, but only momentary. I travel west through the Rocky mountains regularly and average 20-24 MPG at 70-80 MPH. Saw the highest number when the wife was driving through the BC interior at 55MPH, 28MPG... I'm with Sammy Hagar, can't drive 55. LOL
The truck starts and runs great. It has 270,000kms and has been a reliable work horse. I have been working through custom tunes using EFI Live for many years. The issue is that when it hits fifth gear at 55-60 MPH it falls flat. First through fourth it pulls hard. Once it hits fifth, its like I just added 20klbs to the load... EGTs are down to 8-900 from the typical 11-1200 and rail pressure is down to 19-22,000PSI. The commanded value at that point in the tables is 28-30,000. In 3rd and 4th, seeing the commanded pressure of 30-31KPSI. But its pulling so hard it doesn't stay there for long before it shifts. I have changed out the fuel filters (still using the engine mounted fuel filter) and am confident that its not a delivery issue. 3rd gear lockup will break the tires loose when it hits!
What am I missing?? The CP3 is stock and still the original part.
The current tune is for a mix of performance and mileage. Slight smoke if the throttle is jabbed, but only momentary. I travel west through the Rocky mountains regularly and average 20-24 MPG at 70-80 MPH. Saw the highest number when the wife was driving through the BC interior at 55MPH, 28MPG... I'm with Sammy Hagar, can't drive 55. LOL
