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Thread: First log indicating Rich

  1. #1
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    First log indicating Rich

    Just got an 04 GTO a week ago and HP Tuners a few days ago. car was originally in California and I'm in Iowa so that explains why it's rich at WOT.I have been reading for a few hours but before I change anything just want some others to take a look. Below is what was added to the car.
    MAGNUSONS SUPER CHARGER

    DIFF TECHNICS 3.91 GEAR

    LS7 CLUTCH

    LS7 FLYWHEEL

    CORSA CAT BACK EXHAUST

    CAT-LESS MIDPIPES

    MOROSO DB REDUCER

    JBA HEADERS

    K&N COLD AIR INTAKE

    90MM THROTTLE BODY

    90MM MAF SENSOR

    SNOW PERFORMANCE METHONAL INJECTION

    PATRIOT PERFORMANCE LS6 STAGE II HEADS (650 MAX LIFT)

    HARLAND SHARP ROLLER ROCKERS (1.8)

    383 STROKER ENGINE

    WEISCO PISTONS

    SEAT RODS (I BEAM)

    LS7 CRANK

    COMP CAMS CAMSHAFT (242/248 DEGREE-.648/.650) CUSTOM GROUND FROM COMP CAMS

    AROMOTIVE STEALTH 340 LPH FUEL PUMP

    TRICK FLOW 60LB INJECTORS
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    Last edited by Rlarson; 06-28-2014 at 04:09 PM.

  2. #2
    Advanced Tuner umrjmac's Avatar
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    Just to ask the silly question: Are you observing that it is running rich on a wideband? What is the PE AFR and what are you observing? If you are running one of the enhanced OS options, what is the Boost AFR?
    Kenne Bell Supercharged 2003 Corvette Z06

  3. #3
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    sorry was tring to upload while your responded cant get the csv to upload

    don't have a wideband on the HP Tuners yet but I uploaded the Dynojet commander
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    Last edited by Rlarson; 06-28-2014 at 04:16 PM.

  4. #4
    Advanced Tuner umrjmac's Avatar
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    It looks like its doing what you're telling it to.

    Take a look at your power enrichment EQ ratio table. To translate that into AFR take your programmed stoich value (14.681) and divide it by the values in that table. For example, at 6,000 RPM your EQ ratio is 1.4609. 14.681/1.4609 = 10.05. At the 17.69 record in run1.txt, it looks to have logged an AFR of 10 for 6,095 RPM. Granted, I only spot checked one value, so it may be off at another point. You'll have to figure that one out for yourself
    Kenne Bell Supercharged 2003 Corvette Z06

  5. #5
    Advanced Tuner umrjmac's Avatar
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    Oh, FWIW, the target AFR at WOT for a forced induction vehicle is different than what you may be used to for something running naturally aspirated. Conventional wisdom seems to be to start around 11:1 and go up or down from there as needed (someone feel free to chime in with a contrary/more educated opinion).

    When I got my vette, the "tuner" that tuned it for the previous owner had the AFR dipping into the mid 9's. I'm in the process of rectifying that situation right now
    Kenne Bell Supercharged 2003 Corvette Z06

  6. #6
    Advanced Tuner umrjmac's Avatar
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    Corollary thought number 2: Don't just go in there and change the PE EQ ratios and assume that it will be good. I would expect that whoever tuned it previously adjusted timing on a dyno so that it was running efficiently at the AFR commanded by the tune. If you make it more lean (going from 10 to 11, for example) without touching the timing, you may introduce knock or, worst case, blow something up.

    Read, read, read, read some more, start small and see how things change as you make adjustments, get a wideband that you can log with HPTuners, etc.

    Measure twice, cut once, or whatever the corresponding tuning-related nugget would be.
    Kenne Bell Supercharged 2003 Corvette Z06