Kr on stock tune

Discussion in 'Generation 4 - Performance Upgrades' started by TBEcoSho, Nov 26, 2019.

  1. TBEcoSho

    TBEcoSho New Member

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    Hey guys,
    I am a newer sho owner and I have a question. What are acceptable kr readings for stock tune? I am using the sct x4 and recently put it back to stock from an Ortiz 93 tune where I'm used to seeing little kr. I am seeing as much as plus 5 on the stock tune now. Pretty much stock other than that besides some exhaust deletes. Thanks!
     
  2. krewat

    krewat SHO Member

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    Be careful with the "sign" of the KR - + or - mean different things. I THINK, if it was negative (-), it would be retarding. Positive (+) means the system is adjusting for higher octane gas. You running 93?

    Check the OAR (Octane Adjust Ratio) too - it will go to a full +1 on 93 octane.
     
  3. SM105K

    SM105K Land Yacht Pilot Supporting Member

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    It is opposite. If you are seeing +KR then it is pulling timing. Stock tunes are known to do this.
     
  4. TBEcoSho

    TBEcoSho New Member

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    I'm running 93. OAR is 0.96. Edit negative 0.96
     
    Last edited: Nov 26, 2019
  5. krewat

    krewat SHO Member

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    Gotcha - maybe it was OAR I was thinking of.
     
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  6. SM105K

    SM105K Land Yacht Pilot Supporting Member

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    No worries. It is the opposite on other platform.

    Just to clarify.........

    If you are seeing positive KR that means the engine is seeing knock and pulling timing.

    If you are seeing negative KR that means the engine is adding timing.
     
  7. TBEcoSho

    TBEcoSho New Member

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    The OAR seems to always stay the same no matter where I get gas, which is always 93. When does it change?
     
  8. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Supporting Member

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    Hey bud, Lee here. Is this Eric? Sorry I don't recognize the username.

    As others have said, if it's positive (+) KR you are pulling timing (bad) , negative (-) KR is adding timing (good).

    What driving style are you using with seeing the +5 KR activity? cruising or wot?

    Feel free to PM me if you were having any concerns with your tune and why you removed it, I do show it's been over a year since your last revision (assuming this is actually Eric haha) so you'd be due for an update.

    Here to help!
     
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  9. stripSHO

    stripSHO SHO Member

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    Occasional kr+ isn't really anything to worry about but it definitely shouldn't do for any long period of time. And if it does then you should see OAR climb pretty quick. What MAP sensor do you have installed?
     
  10. TBEcoSho

    TBEcoSho New Member

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    2.5 bar. OAR was - 0.96
     
  11. stripSHO

    stripSHO SHO Member

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    Put the original 2 bar back in. PCM is reading lower than actual manifold pressure and it's throwing everything out of line. Surprised you're not having any driveability issues.
     
  12. TBEcoSho

    TBEcoSho New Member

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    I did. It is my understanding the stock tune will throw a check engine light with a map sensor other than 2 bar.
     
  13. SHOdded

    SHOdded SHO Member Supporting Member

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    2.5 bar? I see that on the F150, not the SHO.
     
  14. stripSHO

    stripSHO SHO Member

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    I don't know that it would pop the CEL right away, particularly with only 2.5 bar instead of a 3. I think it'd depend on how it was driven and what your fuel trims were doing. I assume if nothing else it eventually causes an IPC error but those take time.
     
  15. StealBlueSho

    StealBlueSho BJSHO

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    Several places are selling the 2.5bar now as opposed to the 3bar...

    Most people will never see more boost than 2.5bars can read and they are half the price since the 3bars are now 100+ bucks.

    A 2.5bar map can accurately read up to 21.56psi relative to atmosphere...




    Sent from my iPhone using Tapatalk
     
  16. SHOdded

    SHOdded SHO Member Supporting Member

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    k just doublechecking :)
     
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  17. skyshadow07

    skyshadow07 SHO Member

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    Subbed, this is a very entertaining thread to browse
     

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