Detriot s60 boost and map sensor

Discussion in 'Ask An Owner Operator' started by Guf, Apr 7, 2019.

  1. Guf

    Guf Light Load Member

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    Hey folks, first post long time follower.
    Have a few questions for the gurus.
    installed a scanguage d and it only reads 32psi max, Truck is tuned about 625hp s60 12.7 ddec 4 99. Should be seeing 35 to 40 estimate. Will the map sensor limit boost and fuel if it only sees 32 on the map sensor? The stock map sensor is a 2bar how can I install a 3 bar sensor? Maybe I'm wrong, Since the scan guage reads off the ecm will this affect the fuel vs boost and what the engine needs?
    I dont have a mechanical guage installed but will be ordering one shortly to see actual boost readings. I know on my diesel bmw and ecu tuning that is not an issue since they installed 3 bar map sensors. Any insight would help!
    Thanks in advance

    Mods
    Full tilt mani
    Straight pipes
    Borg 1702
    Tuned dr diesel in effingham IL
     
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  3. blairandgretchen

    blairandgretchen Road Train Member

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    95 S60

    Mine reads 30 on the Scan Guage and 36-39 on manual factory guage.

    DCS Fernando hipped me to this point you mentioned. He repaired the board and tuned.

    I'm running BW 1702 and Full tilt now.
     
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  4. Liquidforce

    Liquidforce Light Load Member

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    2 bar is 29.7 psi. I’d be installing a 3 bar sensor, that should theoretically read up to 44psi. They are cheap enough.
     
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  5. dougjames8679

    dougjames8679 Bobtail Member

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    Apr 26, 2011
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    A DD expert explained to me that EMC reads a max of 32 pounds of boost even though my gauge reads 38. Get a boost gauge and hammer down.
     
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  6. blairandgretchen

    blairandgretchen Road Train Member

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    Son?
     
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  7. blairandgretchen

    blairandgretchen Road Train Member

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    So - what's cool for a pyro reading? I'm seeing 700-900 on an ISSPRO.
     
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  8. benjamin260_6

    benjamin260_6 Medium Load Member

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    The ecm only shows 31.88# boost on a DDEC 4...some displays will round up to 32 or down to 31.5. The sensor is still reading after this. The CEL will usually turn on from high boost at around 43# boost depending on who tuned it.
     
  9. swaan

    swaan Road Train Member

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    700-900 is perfect. Hammer down.

    As far as boost goes just put a manual gauge in. The ecm only goes to 31 psi on my Detroit. Manual guage goes to 48psi. :)
     
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  10. Guf

    Guf Light Load Member

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    If the ecm only sees 32psi how is it adding more fuel to more boost? What controls the boost? Fuel? How does it know it needs more fuel for boost of 40 psi?

    On my bmw diesel there is a maf and a map sensor so it reads off of those 2 sensors and adds fuel timing according to sensor data.
     
    Last edited: Apr 7, 2019
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  11. Guf

    Guf Light Load Member

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    Can you add any 3 bar map or it has to be specific? Also if a 3 bar map is installed will the ecm read more boost?
     
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