What’s 12.7 max boost psi.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Heavy pressure trucking, Aug 3, 2021.

  1. Heavy pressure trucking

    Heavy pressure trucking Bobtail Member

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    Nov 23, 2019
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    I was pulling a dry van 32k pounds and my truck felt like load was 50k. Put a computer on truck and seen boost psi is max 20 psi that’s with foot to the floor. Is that to low for a 12.7. And computer said hp is only 430 when tag on engine says 470. I’m thinking company had truck turned down but I’m not sure. Any help will be greatly appreciated.
     
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  3. 062

    062 Road Train Member

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    You need to put a mechanical gauge on to verify. I have a Cat that only shows 22psi on the ecm,but the mechanical 34-36psi.
     
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  4. little cat 500

    little cat 500 Road Train Member

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    430 detroit should be 25ish on the boost
     
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