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No WB, so how much to richen up for cutout?

This is a discussion on No WB, so how much to richen up for cutout? within the Computer & Tuning forums, part of the LSx Technical Help Section category; In everyone's experience, (percentage-wise) how much did you have to richen up your WOT to get near the same a/f ...

  1. #1
    TunedByFrost supporter rel3rd's Avatar
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    Cranberry Red
    1971 Chevelle SS 402

    Question No WB, so how much to richen up for cutout?

    In everyone's experience, (percentage-wise) how much did you have to richen up your WOT to get near the same a/f ratio as when it is closed?

    I don't own a wideband yet, and was going to modify a few tunes for the cutout, so that I could simply reflash and try it out at the track...

    Thanks for any help or suggestions...
    2002 Silverado Z71 ECSB HPTuners tuned by yours truly
    2000 Pontiac Trans Am WS6 6.0, 4L80E, Rear mount Turbo, etc...
    webpage: http://www.fquick.com/rel3rd/

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  3. #3
    Moderator Firebirdjones's Avatar
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    I'm going to step out on a limb here and say that you probably won't see enough change from a cutout to worry about the AFR. But it depends on the system design.

    Reason I say this,,,is I run a pair of 3 inch electric cutouts on my chevelle,,,,and with the wideband hooked up,,,,I can open and close the cutouts while running and I only see a change of 13:1 AFR closed to 13:2 AFR while open.

    This car has a pretty efficient system when closed though,,,,but even with dual cutouts right at the header collectors I don't see much change.

    Maybe on a car with a more restrictive system this could be an issue,,,such as a single system on a camaro,,,,or maybe having only one cutout as many people install on these 4th gens. Any of these things could change the outcome. Without the wideband it's somewhat of a guessing game.

  4. #4
    TunedByFrost supporter rel3rd's Avatar
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    Cranberry Red
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    Thanks guys. I won't worry about it.

  5. #5
    We'll be back... GatorSS's Avatar
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    Get the wideband first, then tune for it. Otherwise, it's almost like using an 8-ball for guidance.

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