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Low Boost

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Sorry for the long post but I have to give some background. 08 f250 with 00 24v Cummins. Recently finished the swap and have been driving around for the past month. Truck seems very slow until converter locks up. With a sxe363 63/68/14 and DAP 175hp sac injectors I’m only seeing around 20 psi of boost with 50% throttle and seeing 1200-1300 on egts. I just started playing with tuning on my quad adrenaline (NO WIRE TAP) and was able to get the egts down some but the boost still seems low. Actually lower. At 50% throttle, 2500rpm, lvl3 quad, egts are now 1100 and boost is 16psi. I’ve been told by some that my boost #s are extremely low for my setup. I’ve made a boost leak tester and found a leak at grid heater and did a delete and now have no leaks. I also noticed that my boost reading at the ford sensor  (connected to dash daq) in the intake horn (readings I’ve been going off of) are higher than the quad reading. The quad reads about half of what the ford sensor reads at any given psi. (ie- 16psi ford is 8psi quad). I changed the Cummins map sensor today and it didn’t change anything. I just need to know if this is normal for my setup or if it’s way off ? I’ll post my tune below. Truck details are in sig. Thanks 

 

Power levels-10

rpm limit-3400

valet power-75%

pump tap-none

max load timing offset-3.0

low psi timing reduct-4.0

timing reduce scaling-100%

light throttle timing advance-5.0

light throttle load limit-0

rpm timing max-

1500-14

2000-18

2500-22

3000-25

3500-26

boost level fueling can bus

0 through 14 psi- 80-94 (increments of 1)

15 through 18 psi- 96-100 (increments of 2)

20-108

22-114

24-120

26-130

28-140

30-150

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  • Owner

There is a jump swittch inside the Quadzilla for the MAP sensor. I'm not sure which way is which but one way is early MAP sensor and the hang the jump of one pin is the other series of MAP sensor.

  • Author

I’ve checked that and it’s not connected. My understanding is the early 24v like mine is suppose to be like that. But I’m gonna connect it tomorrow and see if anything changes. Thanks

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