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Thread: Lowering Target AFR Properly

  1. #11
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Slowrc View Post
    ...
    Are you saying that if I tune auto ve as described in the tutorial at 12.95 that if I changed B3605 and B3618 to 11.95 and went for a drive that I will still run 12.95 reguardless. I thought if I commanded more fuel in those two areas, I would get more.
    ...
    No.

    If your BEN converged to 1.00 then this now means your that wideband AFR equals commanded AFR (by virtue of VE table now being correct)...

    Whatever AFR you set B3605 and/or B3618 to is what you will now see on the wideband... i.e. BEN will still be 1.00 (VE table will not change).

    That is what 5.7ute and mr.prick are saying above.

    B0101 VE table is the airmass table. B3605 and B3618 are commanded AFR tables.

    [ PCM does this in OLSD:
    - lookup B0101 VE table to get airmass,
    - lookup B3605 and/or B3618 to get AFR (see * note),
    - from AFR and airmass it calculates fuelmass,
    - look IFR table to get flowrate,
    - from flowrate and fuelmass it calculates injector time,
    - lookup injector characteristics and modify injector time.

    * note: PCM selects the richest of the active tables: if PE is active, PCM selects richest of B3618 and B3605
    ]

    If your injector tables match the injectors, then BEN will also stay close to 1.00 during transitions.
    Last edited by joecar; May 14th, 2010 at 03:32 AM.

  2. #12
    Joe (Moderator) joecar's Avatar
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    That's the beauty of correcting the VE table... now whatever AFR you specify in B3605 and/or B3618 will be delivered (will be seen with the wideband).

    If you drag-race, then this eliminates trial and error to achieve a specific AFR...
    instead now you set a specific AFR in B3618, do a pass, compare ET/TS with other passes/AFR's.
    Last edited by joecar; May 14th, 2010 at 03:32 AM.

  3. #13
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    Quote Originally Posted by joecar View Post
    That's the beauty of correcting the VE table... now whatever AFR you specify in B3605 and/or B3618 will be delivered (will be seen with the wideband).

    If you drag-race, then this eliminates trial and error to achieve a specific AFR...
    instead now you set a specific AFR in B3618, do a pass, compare ET/TS with other passes/AFR's.
    SWEET!!!
    -Thanks again
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