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Thread: I want to add more fuel at full throttle to my TBI Tune, need advice.

  1. #1
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    I want to add more fuel at full throttle to my TBI Tune, need advice.

    I have done a few data logs and burn 3 chips so far and now my BLM's and very close to 128. The car is idling and running great. But I would like to add more fuel at full throttle, my NB voltage is around .800 volts at full throttle. I read a thread somewhere on this forum that it should be around .900 to get a good 12.5 to 1 ratio. What table should I be modifying to get the proper ratio at full throttle with having to retune my BLM's, if that is possible.

  2. #2
    Super Moderator dave w's Avatar
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    One option would be to lower the AFR's in the PE WOT AFR Table. Maybe 0.5 AFR less, so for example old value is 12 AFR lower the new value to 11.5 AFR.

    dave w
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  3. #3
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    RE: PE tables

    Quote Originally Posted by dave w View Post
    One option would be to lower the AFR's in the PE WOT AFR Table. Maybe 0.5 AFR less, so for example old value is 12 AFR lower the new value to 11.5 AFR.

    dave w
    Ok Thanks Dave, I have a Power Enrich AFR vs RPM table in my bin. Would that be the same? It only goes to 3200 RPM, my shift points are at 5000 rpm. Will my fuel ratio above 3200 be the same as at 3200 rpm?

  4. #4
    Super Moderator dave w's Avatar
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    I was thinking you were using $4F, my mistake, you have $42. Adjusting PE - AFR table will help provide more / less fuel to Power Enrichment.

    dave w
    Last edited by dave w; 05-13-2014 at 06:08 PM.

  5. #5
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    I wouldn't even attempt to use the narrowband O2 sensor to read the AFR in power enrichment mode.

    12.5 AFR is on the rich side but is a safe number. You can go up to around 13.2 AFR up to the peak torque rpm and then you may find fattening it up above that rpm helps.

    At any rate though, you should tune the VE table as much as possible and then the PE mode AFR will actually be what is set in the table instead of some unknown value that may not correspond.

  6. #6
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    So if I do a data log and My Blm is 128 at 4500 rpm & full throttle, is the engine running the AFR that is in the PE VS RPM table?

    I do plan on getting a wide band with data logging software, I would like one that uses a USB to my laptop. Any Suggestions?

  7. #7
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    Ok I changed the AFR numbers from 12 to 11 and then did a few full throttle runs, the O2 sensor volts were a little higher in the .815-.830 range. I am not sure how accurate it is, As soon as I get some money I will have to get a wide band.

  8. #8
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    BLM isn't active in PE mode so no, you wouldn't find the BLM shows you're tuned properly when you're at full throttle.

  9. #9
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    Ok Thanks Good to know.

  10. #10
    Fuel Injected! JeepsAndGuns's Avatar
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    Did you tune your VE tables with PE disabled?
    PE is based off the VE table, so if its off, your PE AFR will also be off.
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  11. #11
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    I did not disable pe when tuning my tables good to know.

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