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Thread: 3BAR Map Sensor Settings - Scaler and Offset

  1. #1
    Senior Member Behold's Avatar
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    Default 3BAR Map Sensor Settings - Scaler and Offset

    Sense check please.

    Trying to sort some serious issues with a tune on a mates VXR8. The KPA is reading REALLY low. 120kpa for what should be 190KPA at least.

    He has the GM12592525. Am I right that the settings on this is

    315.5 for the scaler
    The offset is 1.1

    Although we can change the offset to fine tune the MAP sensor if its not quite right?

    Any confirmation would be great.
    -----------------------------------------------------------------------------------------
    Thanks Antony

    Holden Commodore GTS - LS1 5.7
    12 rib Crank Driven Vortech V2 Centri Charger (Intercooled) 9 PSI.
    LS6 Intake
    LS6 Heads
    YT 1.7 Roller Rockers
    BTR Dual Spring with Ti retainers
    BTR Hardend 7.400 Push rods
    Comp Cam JAMCAM
    2 Bar Map
    Mafless
    LS2 Coils

    PCM LS1B with 512KB Running COS5 v01290005

  2. #2
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    Doesn't sound right to me (but wait for someone else to confirm)

    85= 1 Bar
    190 = 2 Bar
    285 = 3 Bar

    I would guess your scaler needs changing

    Regards

    Jim
    2000 LS1 M6, No EGR/Air/PS/CATs. TR230 Cam, COS3, OLSD, LC1 Wideband fitted, Procharger P1SC, 2 Bar MAP, Siemans Dekka 60Lb Injectors.
    All wrapped up in a 2000Lb AC Cobra Replica

  3. #3
    Senior Member Behold's Avatar
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    This is half the issue.

    I have seen 288 with 27 as an off set.

    312.5 with -11

    It's not consistent.

    As to map I swear my 2 bar is 198 with 10 or thereabouts. And other stock tunes are the same for 2 bar.

    This is how messed up it is!
    -----------------------------------------------------------------------------------------
    Thanks Antony

    Holden Commodore GTS - LS1 5.7
    12 rib Crank Driven Vortech V2 Centri Charger (Intercooled) 9 PSI.
    LS6 Intake
    LS6 Heads
    YT 1.7 Roller Rockers
    BTR Dual Spring with Ti retainers
    BTR Hardend 7.400 Push rods
    Comp Cam JAMCAM
    2 Bar Map
    Mafless
    LS2 Coils

    PCM LS1B with 512KB Running COS5 v01290005

  4. #4
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    I did mine this week with a 2 bar sensor at 190 with an offset of 10.

    Sanity check - Key on, engine off, read MAP. It should be around 101 KPA at sea level

    Regards

    Jim
    2000 LS1 M6, No EGR/Air/PS/CATs. TR230 Cam, COS3, OLSD, LC1 Wideband fitted, Procharger P1SC, 2 Bar MAP, Siemans Dekka 60Lb Injectors.
    All wrapped up in a 2000Lb AC Cobra Replica

  5. #5
    Senior Member Behold's Avatar
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    So in a stock LSA tune it's 312.5 with -11.25

    The plot thickens.
    -----------------------------------------------------------------------------------------
    Thanks Antony

    Holden Commodore GTS - LS1 5.7
    12 rib Crank Driven Vortech V2 Centri Charger (Intercooled) 9 PSI.
    LS6 Intake
    LS6 Heads
    YT 1.7 Roller Rockers
    BTR Dual Spring with Ti retainers
    BTR Hardend 7.400 Push rods
    Comp Cam JAMCAM
    2 Bar Map
    Mafless
    LS2 Coils

    PCM LS1B with 512KB Running COS5 v01290005

  6. #6
    Joe (Moderator) joecar's Avatar
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    You can also check it using a hand vacuum pump (each 2 inHg is approximately 1 psi, and 5 psi is approx 33 kPa).

  7. #7
    Senior Member Behold's Avatar
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    I will just try some settings. If it reads right it's reading right.

    I am shocked we do not have a section for common base settings.

    Like map sensors
    Injectors
    Etc.

    Would make it easier to home tune.
    -----------------------------------------------------------------------------------------
    Thanks Antony

    Holden Commodore GTS - LS1 5.7
    12 rib Crank Driven Vortech V2 Centri Charger (Intercooled) 9 PSI.
    LS6 Intake
    LS6 Heads
    YT 1.7 Roller Rockers
    BTR Dual Spring with Ti retainers
    BTR Hardend 7.400 Push rods
    Comp Cam JAMCAM
    2 Bar Map
    Mafless
    LS2 Coils

    PCM LS1B with 512KB Running COS5 v01290005

  8. #8
    Junior Member
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    I agree!
    I just got back into the game since the LT-1 OBD-1 days.
    I created a repo on github for maps,pids and anything else. https://github.com/OpCode1300/E38_Tuning
    post anything here, or submit a pull request on github.

    I'll add the 3-bar tonight, ordered one for my whipple install last week.
    Last edited by opcode; April 12th, 2016 at 10:31 AM.

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