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C15 manifold pressure. How much is too much?

Discussion in 'Peterbilt Forum' started by Old fat guy, Jan 1, 2017.

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  1. Jan 1, 2017 #1
    Old fat guy

    Old fat guy Bobtail Member

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    Had a c15 twin turbo rebuilt 100000 miles ago. My manifold pressure gauge goes to 60 regularly. I'm afraid of engine damage if I push it more. Is there such a thing as too much pressure?
     
    Old fat guy, Jan 1, 2017
    Old fat guy, Jan 1, 2017
    #1
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  3. Jan 1, 2017 #2
    BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Doesn't sound good.I would think 22 or 23 would be normal.Maybe all the way to 30 when you are pushing it.Is that Guage working correctly? Yikes
     
    BUMBACLADWAR, Jan 1, 2017
    BUMBACLADWAR, Jan 1, 2017
    #2
  4. Jan 1, 2017 #3
    ‘Olhand

    ‘Olhand Cantankerous Crusty

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    Twins are fine to 60 and more actually.....mine hits gate about 57 no issues......but if u set much above 60.....you have to drive carefully....you'll have to roll into it a lil easier&do not chop the throttle above 60.....
    25-33 or so typically normal specs for stock single turbo c15
     
    ‘Olhand, Jan 1, 2017
    ‘Olhand, Jan 1, 2017
    #3
    Diesel Dave, BUMBACLADWAR and SAR Thank this.
  5. Jan 1, 2017 #4
    Superhauler

    Superhauler TEACHER OF MEN

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    I had one that went to 70 lbs and more. 60 isn't going to hurt.
     
    Superhauler, Jan 1, 2017
    Superhauler, Jan 1, 2017
    #4
    KB3MMX, ‘Olhand, peterbilt_2005 and 1 other person Thank this.
  7. Jan 2, 2017 #5
    BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    You're right.I was thinking "single".Totally missed the twin part.
     
    BUMBACLADWAR, Jan 2, 2017
    BUMBACLADWAR, Jan 2, 2017
    #5
    ‘Olhand Thanks this.
  8. Jan 2, 2017 #6
    Old fat guy

    Old fat guy Bobtail Member

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    Old fat guy, Jan 2, 2017
    Old fat guy, Jan 2, 2017
    #6
  9. Jan 2, 2017 #7
    Old fat guy

    Old fat guy Bobtail Member

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    Thanks, actually rebuilt twice in 3 months. First time had a cracked head (new). Don't want to go through that expense again.
     
    Old fat guy, Jan 2, 2017
    Old fat guy, Jan 2, 2017
    #7
  10. Jan 3, 2017 #8
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Rebuild twice in three months ? Crack head the first you say, what about the second time ? Did they check the protrusions when replacing the head ?
     
    Diesel Dave, Jan 3, 2017
    Diesel Dave, Jan 3, 2017
    #8
  11. Jan 8, 2017 #9
    KB3MMX

    KB3MMX Road Train Member

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    Not uncommon for a hot rodded single turbo to go 60+ either
     
    KB3MMX, Jan 8, 2017
    KB3MMX, Jan 8, 2017
    #9
  12. Jan 17, 2017 #10
    Imontoya

    Imontoya Bobtail Member

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    I have 06 379 C-15 twin turbo Alert Rebuilt 100k ago, platinum. Bully dog tune with boost harness. I can get 64lbs of pressure no problem but like mentioned before gotta be gentile with her.
     
    Imontoya, Jan 17, 2017
    Imontoya, Jan 17, 2017
    #10
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