Tweet
For about 6-8 months I have been noticing a decline in the amount of boost the truck is producing and higher egt's. Mods are:
Banks intercooler and all the tubes
K&N intake
Superchip tuner
4" Turbo back MBRP
Upgraded turbo wheel
Banks big head actuator
The transmission has also had a valve job done and we added a deep pan. When I bought the truck I immediately added the intake, tuner, and exhaust, but didn't spring for gauges. About a year later I added the intercooler and turbo wheel and gauges. At that time I could get about 22psi of boost. So around 8 months ago, I could only get 18psi. Then another couple months went by and 15 was the max. then a few more months went by and 12-13 was the max. Then we just recently dropped to about 10-11. Did some digging at powerstroke.org and thought I had it pegged to the ebpv and sensor so I had those cleaned and also added the big head. Now I can get around 15psi, and I have noticed that it spools up quicker. I also hear the intake a little more now. When it was only making 10-11psi I couldn't hear the intake. EGT's have also dropped about 50*-100* since the cleaning and the big head. When I was making 22 psi the egt's never hit 900*. I can hit that pretty regularly now. I even touched 1000* when doing 70 up a mountain. I used to do that mountain at 70mph and around 800*. We have checked for leaks and haven't found any as well as checking the turbo. Everything seems to be functioning the way it should. I even swapped out the boost gauge from ISSPRO to dipricol, and they both read the same. Today i scanned for codes. With the performance tune installed I got P0478. With tow tune installed I got P0603. I can also get about 1-2psi more boost out of diesel as opposed to oil. Fuel pressure never drops.
If anybody has any thoughts, I would really appreciate the help.
Banks intercooler and all the tubes
K&N intake
Superchip tuner
4" Turbo back MBRP
Upgraded turbo wheel
Banks big head actuator
The transmission has also had a valve job done and we added a deep pan. When I bought the truck I immediately added the intake, tuner, and exhaust, but didn't spring for gauges. About a year later I added the intercooler and turbo wheel and gauges. At that time I could get about 22psi of boost. So around 8 months ago, I could only get 18psi. Then another couple months went by and 15 was the max. then a few more months went by and 12-13 was the max. Then we just recently dropped to about 10-11. Did some digging at powerstroke.org and thought I had it pegged to the ebpv and sensor so I had those cleaned and also added the big head. Now I can get around 15psi, and I have noticed that it spools up quicker. I also hear the intake a little more now. When it was only making 10-11psi I couldn't hear the intake. EGT's have also dropped about 50*-100* since the cleaning and the big head. When I was making 22 psi the egt's never hit 900*. I can hit that pretty regularly now. I even touched 1000* when doing 70 up a mountain. I used to do that mountain at 70mph and around 800*. We have checked for leaks and haven't found any as well as checking the turbo. Everything seems to be functioning the way it should. I even swapped out the boost gauge from ISSPRO to dipricol, and they both read the same. Today i scanned for codes. With the performance tune installed I got P0478. With tow tune installed I got P0603. I can also get about 1-2psi more boost out of diesel as opposed to oil. Fuel pressure never drops.
If anybody has any thoughts, I would really appreciate the help.
Think of that engine as what it is, a great big compressor.I believe that this is a loss of pressure(either a flaw in the Air intake,or exhaust).This is a matter of fasteners and tubes,not big horse tunes.I had a truck F800, all ways chasing boost,everday for a week,and then we did a two-week service for wear and tear, duh it needed a "nut and bolt".These systems were designed for servicing,not replacement.Start at air intake in tube and work to the tail-pipe,putting your fasteners to torque specs,I did this and the truck came back to correct boost #s.Up the mountains and down the road she went tugging like she was meant too........at full boost,with the hammer down.Sometimes its the little things we overlook that add upon our shoulder weight,that can be brushed away with a good snowy day in a garage..........greasy
Comment