Thread: 13.8 MPG! wow....

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    GT Level Member tylerbinski's Avatar
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    Quote Originally Posted by rodneypierce View Post
    Im a big OL fan myself... Prefer SD OL on the LS series stuff, but not sure how well it would work on the 3800 S/C'd stuff.
    I ran both for a couple months- seemed more responsive and wasnt hard to tune with wide band.

    i wouldn't sell a car with SD OL wothout the buyer knowing as the tune is highly sensitive to atmospheric conditions and needs close monitoring.

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  2. #2 Re: 13.8 MPG! wow.... 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by tylerbinski View Post
    I ran both for a couple months- seemed more responsive and wasnt hard to tune with wide band.

    i wouldn't sell a car with SD OL wothout the buyer knowing as the tune is highly sensitive to atmospheric conditions and needs close monitoring.
    Meh, my buddy recently moved to Colorado with his open loop NIC car... Works fine.
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  3. #3 Re: 13.8 MPG! wow.... 
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    Quote Originally Posted by darkhorizon View Post
    Meh, my buddy recently moved to Colorado with his open loop NIC car... Works fine.
    I've seen comparisons of MAF and SD calcs on a V8 PCM.

    It seems they were both as accurate, but the MAF had more outliers.

    Flexibility of the SD tune would depend on its accuracy.
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  4. #4 Re: 13.8 MPG! wow.... 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by matt5112 View Post
    I've seen comparisons of MAF and SD calcs on a V8 PCM.

    It seems they were both as accurate, but the MAF had more outliers.

    Flexibility of the SD tune would depend on its accuracy.
    Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.
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  5. #5 Re: 13.8 MPG! wow.... 
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    Quote Originally Posted by darkhorizon View Post
    Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.
    Good point.

    However I can only think of two reasons you'd want to run open loop though.

    Lean cruise or by-pass MAF.
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  6. #6 Re: 13.8 MPG! wow.... 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by matt5112 View Post
    Good point.

    However I can only think of two reasons you'd want to run open loop though.

    Lean cruise or by-pass MAF.
    You can run in sorta closed loop in SD mode though.... The few SD LSx cars I have tuned pretty much need to have a narrowband helping them out for cold/hot stuff unless you really play with dialing in the tune.... Even then I had problems.
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