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Thread: Can't get this right

  1. #31
    Joe (Moderator) joecar's Avatar
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    From the COS tutorial, page 14:

    Configuring a 2 or 3-bar MAP sensor

    When the key is on but the engine is not running, the MAP sensor reads the barometric air pressure, usually 101kPa (14.7psi). When tuning in high altitude areas it is worthwhile reading the MAP values (using EFILive’s Scan Tool) at key-on with the standard 1-bar sensor to obtain the barometric pressure at the current altitude.
    After fitting your 2 or 3-bar MAP sensor, you must rescale the MAP sensor.

    Engine Diagnostics->MAP->Parameters
    {C6301} MAP Sensor Scaler:
    2-bar sensor: 190
    3-bar sensor: 288
    These values will get the MAP scaler’s value close to what it needs to be, you will then need to adjust it (by small amounts) until the MAP sensor reads the same barometric pressure that your standard 1-bar sensor was reading at key-on, engine-off.
    Logging boost levels in the Scan Tool must be performed with the PID ‘SAE.MAP’.

  2. #32
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    I set up the Ben map exactly like the tutorial said and use the filters before the cut and paste to the tune. I did get the map sensor reading the same now so I will try to get some good logs to do the auto ve with.

  3. #33
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    I did get a good run or two in today and the car is still not right yet. When you let off of the throttle it is going way too rich and when you first get back into the throttle it goes way lean to the point that the car bucks before it goes. It feels great under acceleration it is pulling hard and no knocking and barely able to hold traction. Attached is the log file fdrom the run.
    Attached Files Attached Files

  4. #34
    Lifetime Member johnv's Avatar
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    post up the tune you were running while doing the data logging.

    The Ben map from the log after low cell count cells are hidden and filters applied, looks like it should start to correct your fueling in problem areas.

    There is a bit of knock as well, easier to see if you open a MAP for Knock retard speed density.
    Back yard boost
    347+ T76 = 770 rwhp 10.96 @ 135 mph

  5. #35
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    Here is the tune that I was using.

  6. #36
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    I forgot to attach it, so here it is
    Attached Files Attached Files

  7. #37
    Lifetime Member johnv's Avatar
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    Okay use this one for your next round of Auto VE logging, try to hit as many cells as you can, try holding 1st gear and slowly increasing rpm, then the same in 2nd and third, you can even load it up more by useing the brakes while applying throttle to hit cells you normally wouldn't.
    Attached Files Attached Files
    Back yard boost
    347+ T76 = 770 rwhp 10.96 @ 135 mph

  8. #38
    Senior Member Chuck L.'s Avatar
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    What did you find the FP to be?
    [I saw a post requesting the setting.. haven't seen a reply.]
    Tuning w/o knowing if the FP is correct, is going to create problems.
    Chuck L.
    CODY Motorsports
    Fuel Injector Service
    Madison, GA.
    706-342-3152
    770-265-5144 [C]

  9. #39
    Lifetime Member johnv's Avatar
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    Yes good call, I assumed fuel rail pressure was still the factory 4 bar
    (58 psi) and not rising rate (not boost referenced)

    Also your Map sensor scaler seems quite high, did you log manifold MAP with key on engine off when you rescaled it ?
    Last edited by johnv; March 15th, 2010 at 09:39 AM. Reason: added more questions
    Back yard boost
    347+ T76 = 770 rwhp 10.96 @ 135 mph

  10. #40
    Joe (Moderator) joecar's Avatar
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    eclipse1, they're asking your if your FPR is manifold-referenced...?

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