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Explain it to me like i'm 5

Discussion in 'Tuning À la carte' started by Mok4200, Sep 19, 2019.

  1. Mok4200

    Mok4200 Member Established Member

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    Did a short idle/rev data log, and i'm concerned with what i see. Short term showing bank 1 max is 1.19 and bank 2 is max at 1.20, i've been told anything over 5% is bad...so at 20% im down right worried. Am i understanding that correctly? or should i not be worried? Car has dual fuel pumps, wondering if i should rip them out and put a single high flow in...
     

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  2. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    Are you just starting a tune or did you want to check something?
     
  3. Mok4200

    Mok4200 Member Established Member

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    I’m concerned with the tune that’s on the car. I bought this car in October of 2018 and have not touched it. Now I’m worried that I shouldn’t be driving it at all
     
  4. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    Well, a new pump won't change your STFT's. That's in the tune itself. Are you getting any codes? If everything is mechanically good then I'd talk to a tuner.

    Usually I would say a lean condition is from a vacuum leak. Both sides would be something in the intake. But the car wouldn't run right at that point.
     
  5. Mok4200

    Mok4200 Member Established Member

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    No codes, I’ll likely have it re-tuned, is there any concerns with using American Muscle? They’re considerably cheaper and tune far more cars than any shop in close to
     
  6. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    Stay away from AM for tunes. Talk to one of the real tuners on here. You'll be better off in the end.
     
    DSG2003Mach1 likes this.
  7. DSG2003Mach1

    DSG2003Mach1 Well-Known Member Premium Member Established Member

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    no to AM. Blown motor is gonna cost ya 10k to rebuild, a few extra bucks for a good tune is worth it.
     
    96gt02 likes this.
  8. 96gt02

    96gt02 Well-Known Member Established Member

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    Yeah your running roughly 20% lean too, and even at idle your about 10% still. Rich would at least be safer but still not great, car wont throw a lean code until it hits 25% just FYI
     
  9. Chersch7406

    Chersch7406 Active Member Established Member

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    I see your in Michigan, depending on where your located I would go with Alternative Auto(Lidio) just north of Detroit.
     
  10. decipha

    decipha Active Member Established Member

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    thats the lambse your looking at its removing 20% fuel.

    If your parked/idle/not moving then that number means absolutely nothing on a quick throttle stab
     
    Mok4200 likes this.
  11. decipha

    decipha Active Member Established Member

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    thats the lambse your looking at its removing 20% fuel.

    If your parked/idle/not moving then that number means absolutely nothing on a quick throttle stab
     
  12. Mok4200

    Mok4200 Member Established Member

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    I was parked, though these numbers are similar to when the car is cruising.
     
  13. ViperRed91GT

    ViperRed91GT Lightning Guru Established Member

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    To add to what’s decipha said, the 5-10% is the max variance you want to see between the two. Those numbers just show what the computer is having to do to get the commanded AFR.
     

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