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Thread: Wide Band O2 (WBO2 Tuning) Spreadsheet

  1. #61
    Super Moderator dave w's Avatar
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    Quote Originally Posted by CDeeZ View Post
    Question:

    All of the changes made to the Open Throttle VE table were a reduction in VE, as I would expect based on the rich AFRs during the capture of that particular log. However, there are 3 cells in Idle VE table that were modified by the spreadsheet that were all an increase in VE.... Two cells in particular, that are the same RPM and KPA between both tables, cells were increased in the Idle VE table, and, decreased in the Open Throttle. Possibly a spike of irrelevant data causing the discrepancy?
    Welcome to the complex world of tuning. Change parameters, and see what happens in the spreadsheet (that's tuning). Typically increasing a VE cell value will lower AFR (richer). Typically decreasing a VE cell value will increase AFR (leaner). It's a good plan to have at least 5 data points (counts) in a VE cell, before making changes to the VE cell. It's a good plan the "Smooth" peaks and valleys in the VE Table.

    Stating the obvious:
    An engine requires less fuel at low RPM's and light engine load.
    An engine requires more fuel at high RPM's and heavy engine load.
    An engine needs more fuel to accelerate to 70 MPH, yet an engine needs less fuel to maintain 70 MPH once it achieves 70 MPH.

    The VE Table is 3 dimensional, Load / Fuel / RPM, understanding the three statements above is 3 dimensional thinking.

    dave w

  2. #62
    Fuel Injected! CDeeZ's Avatar
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    Quote Originally Posted by dave w View Post
    Welcome to the complex world of tuning.
    Yeah tell me about it. Sometimes I wish I would have just jammed another LS in this truck like I did in my other TBI era OBS. Ironically, tuning an LS, even with a power-adder is easier for me. But, TBI is where I first started tinkering with EFI and it always has held a soft spot in my heart. It was the first transition from the era of carburetion into injection. And, TBI trucks just run forever and ever. Sure, you'll have burned up 3 or 4 anemic 4L60s in that time but the 300k+ mi TBI SBC is still going and doing what it was intended to do.

    In a way it is cool though to have a strong TBI setup and keep the OBD1 era going, becuase OBD1 had to exist before anything that came after it.

    In my interpretation of the data I mentioned above, I figured basically what you are saying about ignoring the spikes in the data and smoothing it all down as necessary.

    Dave, your spreadsheet (and other contributions) have helped me and many, many others. I know Mark is pleased. I appreciate your efforts and I'll say this.... Just tell me where I need to mail the money for beer and hookers to say, thanks, and I will!
    Last edited by CDeeZ; 01-16-2019 at 12:01 AM.

  3. #63
    Super Moderator dave w's Avatar
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    Quote Originally Posted by CDeeZ View Post
    Dave, your spreadsheet (and other contributions) have helped me and many, many others. I know Mark is pleased. I appreciate your efforts and I'll say this.... Just tell me where I need to mail the money for beer and hookers to say, thanks, and I will!
    Your public acknowledgement and kind words about my support of the board is both heart warming and very much appreciated!

    dave w

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