Results 1 to 13 of 13

Thread: LNF LTFTs

  1. #1
    Advanced Tuner Japeatr's Avatar
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    321

    LNF LTFTs

    I know its late, and im more than likely over looking it...

    But previous tuner disabled LTFTs on car im looking at.

    How can i reenable... Flying by Short terms isnt helping very much

    384whp/303wtq
    Built 2.0LSJ: TVS w/2.6, 1000cc, Stage 2 cams, custom fuel system, E85, Dual Pass, 3"intake, 3" Catless exhaust, CIA midlength Header

  2. #2
    Senior Tuner cobaltssoverbooster's Avatar
    Join Date
    Dec 2008
    Location
    Nevada
    Posts
    4,452
    deleted- wrong vehicle.. my bad
    Last edited by cobaltssoverbooster; 08-28-2014 at 01:12 AM.
    2000 Ford Mustang - Top Sportsman

  3. #3
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    who's car are they shut off on?
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  4. #4
    Advanced Tuner Japeatr's Avatar
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    321
    Stephen kenney

    New guy, some dyno shop tried to tune DI like a PI car

    384whp/303wtq
    Built 2.0LSJ: TVS w/2.6, 1000cc, Stage 2 cams, custom fuel system, E85, Dual Pass, 3"intake, 3" Catless exhaust, CIA midlength Header

  5. #5
    Advanced Tuner
    Join Date
    Feb 2010
    Location
    The Desert
    Posts
    480
    Plug the evap connector back in, right on the front of the IM.
    09 RY Cobalt SS Coupe - 19K miles - Bolt ons + 7163 ZFR, HP tuned on ethanol

    Sold - 09 SRTC Cobalt SS Sedan
    Totaled - 09 VR Cobalt SS Sedan
    Sold - 09 RY Cobalt SS Sedan

  6. #6
    Senior Tuner cobaltssoverbooster's Avatar
    Join Date
    Dec 2008
    Location
    Nevada
    Posts
    4,452
    If anything I delete maf sensors because they can get to twitchy but that forces lt mode on by itself.

  7. #7
    Advanced Tuner Japeatr's Avatar
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    321
    so which tab in hpt enables/disables the LTFTs?

    384whp/303wtq
    Built 2.0LSJ: TVS w/2.6, 1000cc, Stage 2 cams, custom fuel system, E85, Dual Pass, 3"intake, 3" Catless exhaust, CIA midlength Header

  8. #8
    Advanced Tuner
    Join Date
    Sep 2007
    Posts
    471
    Their isn't a table to disable it. You disconnect the Evap Purge Solenoid to disable LTFTs.
    Last edited by MikeM173; 08-29-2014 at 04:53 PM.

  9. #9
    Senior Tuner Iam Broke's Avatar
    Join Date
    Jul 2009
    Posts
    2,305
    ...or log the sum of (LTFT+STFT) without disabling anything.
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel

  10. #10
    Advanced Tuner
    Join Date
    Sep 2007
    Posts
    471
    Iambroke he said they were already disabled. You do not have to disable them for tuning. I find it better to disable them though when you have cat warmup disabled. That's my preference though.

  11. #11
    Advanced Tuner
    Join Date
    Jan 2009
    Posts
    792
    I disable LTFT's on most of the cars I tune, even 750hp LSA's with E67's!

    You should definitely disable LTFT's during and after you've nailed down the tune. LTFT's are a safety net for mismatched or broken hardware, big fuel quality swings, big altitude and weather changes. Obviously you wouldn't want to build a factory tune without LTFT protection. If your tune is dialed in though and you don't have any climate or hardware changes, LTFT's will just do more harm than good, ESPECIALLY on an LNF. Most ECM's have many different LTFT cells for rpm and load. The E69 has ONE LTFT cell! How ret@rded is that? So if your maf cal is off at idle and you're running rich, when you go WOT that negative LTFT is just gonna confuse the WOT mixtures.

    Get your tune so that the mixtures are close in all conditions and running on STFT's will be perfectly fine and actually result in more consistent fueling.

  12. #12
    ^Nailed it. I was too lazy to type that. =)

  13. #13
    Advanced Tuner
    Join Date
    Sep 2007
    Posts
    471
    Haha same here. In fact I almost responded to GMTechs post and was to lazy to do that. Lol.