05-16-2017, 05:18 AM
Mac1255.9 cumins boost
How much boost should I see in a 5.9 cumins?. I never see much over 5 lbs and I know it should be more. The bus is in the shop for oil and filters and they will look into my boost issue.
Mac
93 Breakaway
05-16-2017, 07:48 AM
Gary CarterAt cruise about 10 lbs. At full throttle up to 25. After installing the large injectors I could do 30 easy.
05-16-2017, 08:35 AM
Mac125Thanks gary! I'll relay that to the mechanic.
Mac
05-16-2017, 09:35 AM
MWrenchThe boost numbers I see are similar to Gary's. Cruise on the flats is between 10-15 Lbs. 22 Lbs at max throttle and max RPM before defueling. (2400 RPM)
Mine is stock 230 HP Cummins with a 1 turn adjustment inward on the AFC. Helps low RPM acceleration.
05-16-2017, 09:00 PM
Fred & CindyYou guys actually have a boost gauge on your dash? Mine does not have one and I have no idea how much boost I get. Seems to run alright though. How difficult would it be to put one in?
05-17-2017, 10:25 AM
Mac125My boost gauge (manifild pressure) is located is located left of the seat just forward of the leveler controls. Not easy to monitor. The problem was a bad fitting in the line to the gauge, cheap to fix but a bit expensive to find. I saw 15 lbs on the way home and the bus seemed to have a bit more power on the mild hills I encountered on the way home. I don't believe I have had any boost since I've owned the bus. Anxious to see how it performes on the interstate now.
Mac
'93 breakaway