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Thread: Please explain Delta MAP Kpa...

  1. #1

    Default Please explain Delta MAP Kpa...

    Can someone please clarify the units used in the {B4001} for injector flow base?

    How are the values derived that make up the row values in that table?

    I also want to know if the E38.INJPDELTA_DMA pid is active and can be logged. Why are the values so large?

    Howard

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    Lifetime Member Bruce Melton's Avatar
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    Howard,
    We are on the same page, once again. Trying to adapt a E67 PCM/tune to run a LS7 with 40# stock LS7 injectors so same question-

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    Lifetime Member jfpilla's Avatar
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    OK, I'll guess that the units are MAP grams/second. The same as in B1210. Take a look at an LS1 file, table C2911. The units are the same and are defined. It seems they changed from MANVAC to MAP.
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

  4. #4

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    I guess when you look at that table and see the -Kpa values it doesn't make sense as when do you see -Kpa's? Is this boost pressure?

    When they state "delta", are they referring to a "change" in MAP pressure?

    Still not gettin' it!

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

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    Quote Originally Posted by Redline Motorsports View Post
    I guess when you look at that table and see the -Kpa values it doesn't make sense as when do you see -Kpa's? Is this boost pressure?

    When they state "delta", are they referring to a "change" in MAP pressure?

    Still not gettin' it!

    Howard
    Instead of referencing manvac such as the Gen-IIIs, these define fuel flow on the differential fuel pressure, which is what this table defines. On a 4 bar fuel system, 400kPa would be approx. WOT, 500kPa absolute vacuum. The question is, where does the ECM define what the static fuel pressure is? There's no fuel pressure sensor from the factory, is there?

  6. #6
    Lifetime Member jfpilla's Avatar
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    Quote Originally Posted by Redline Motorsports View Post
    I guess when you look at that table and see the -Kpa values it doesn't make sense as when do you see -Kpa's? Is this boost pressure?

    When they state "delta", are they referring to a "change" in MAP pressure?

    Still not gettin' it!

    Howard
    Howard,
    I don't get your first question.
    question 2: I read the table as a change in MAP measured in gps. MAP and MANVAC(used in LS1 IFR table)are essentially opposites. When you look at a log they add up to around 100.
    Am i understanding your question?
    Joe
    Joe
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

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    Quote Originally Posted by jfpilla View Post
    Howard,
    I don't get your first question.
    question 2: I read the table as a change in MAP measured in gps. MAP and MANVAC(used in LS1 IFR table)are essentially opposites. When you look at a log they add up to around 100.
    Am i understanding your question?
    Joe
    Joe
    MAP can't be measured in gps. Two separate units entirely. gps can be calculated from MAP, RPM and a given VE definition, but otherwise the correlation doesn't exist.

  8. #8
    Lifetime Member jfpilla's Avatar
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    Quote Originally Posted by dc_justin View Post
    MAP can't be measured in gps. Two separate units entirely. gps can be calculated from MAP, RPM and a given VE definition, but otherwise the correlation doesn't exist.
    Thanks Justin. That was a dumb error. It may actually be a help to my Guess if it's a change in kpa.
    Try this. If the PCM is referencing 100 kpa, then at 640(big change)the injectors could be told to decrease flow(higher IFB value)and at 128(small change)told to increase flow(lower IFB value).

    Any takers?
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

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    It really looks like it only references the 400-500kPa portion of the log file though. One of the tune files I pulled up had static numbers from 400kPa and below and static again from 480 and above.

  10. #10
    Lifetime Member jfpilla's Avatar
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    Quote Originally Posted by dc_justin View Post
    It really looks like it only references the 400-500kPa portion of the log file though. One of the tune files I pulled up had static numbers from 400kPa and below and static again from 480 and above.
    It may be referencing the entire table but not changing the injector flow ouside those areas. Maybe they are getting ready for a blower?

    In any case, what about Howard's question?
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

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