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Thread: turbo jeep 3.8

  1. #1
    Tuner in Training johnwrench's Avatar
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    turbo jeep 3.8

    Getting red lightening bolt limp mode on jeep. At cruising speed. if i keep it out of boost i don't get lightening bolt.
    I am thinking that it is the map vs baro. thought i seen someone disable baro learn to get pass it but don't seem right
    any thought
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    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  2. #2
    Tuner Turbo_Mike's Avatar
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    No codes? How much boost?
    2003 305/555 QCSB Cummins
    Piston/rod/sleeve/fire ring/dual CP3/300 overs
    Super Stick NV5600
    S366/S480

  3. #3
    Senior Tuner Higgs Boson's Avatar
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    i disabled baro learn on my bone stock jeep so....

  4. #4
    Tuner in Training johnwrench's Avatar
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    6 lbs of boost and no codes. when you disable baro do i have to enable sensed map.
    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  5. #5
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    You might want to increase max airflow too...
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

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  6. #6
    Senior Tuner Higgs Boson's Avatar
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    Quote Originally Posted by johnwrench View Post
    6 lbs of boost and no codes. when you disable baro do i have to enable sensed map.
    i did

  7. #7
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    Quote Originally Posted by johnwrench View Post
    6 lbs of boost and no codes. when you disable baro do i have to enable sensed map.
    You need to disable baro learn or else it will slowly creep baro up when in boost.
    It resets at KO.
    Try sensed map enabled, every boosted dodge I have ever done drove better like that,
    and no more light throttle/partial boost lightning bolt.
    Last edited by Hemituna; 01-03-2017 at 09:40 PM.

  8. #8
    Tuner in Training johnwrench's Avatar
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    thanks for the help. I tried it for a bit before work throttle was a lot better. Really rich 11.5afr work that out this weekend. hard starting after warm
    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  9. #9
    Tuning Addict 5FDP's Avatar
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    11.5 isn't really rich on non direct injected motors.

    I don't know enough about how lean the dodge/jeep guys run but that pretty much prefect under boost in the GM world on a non direct injected motor.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  10. #10
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    11.5 is where i aim to be on boosted cars. Mostly tune srt4s but thats my target aft at WOT.

  11. #11
    Tuner in Training johnwrench's Avatar
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    That would be good but its idling at 11.5 WOT is under 10. Commanded AFR is 14.7 thinking inj are set up wrong. floods out anything over haft throttle. cruising at 55 its at 14.3 to 15
    Last edited by johnwrench; 01-06-2017 at 05:20 PM.
    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  12. #12
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    Post your tune and what size injectors?

  13. #13
    Tuner in Training johnwrench's Avatar
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    these are the injector. www.fiveomotorsport.com/107961-siemens-60lbs
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    Last edited by johnwrench; 01-06-2017 at 06:27 PM.
    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  14. #14
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    what is oem injector size? and I assume you input the correct offset data?

  15. #15
    Tuner in Training johnwrench's Avatar
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    22.4lb injectors stock tune to
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    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  16. #16
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    What method did you use to calculate your fuel mass numbers? Because im getting completely different numbers than you by just calculating by the difference from old to new.

  17. #17
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    I see that you changed the injpw values. you need to find the flow of a 60lb injector at 1ms and multiply it by your injpw values to get your fuel mass values. otherwise if you use the stock injpw values you divide 60(lb/hr) by 22.4(lb/hr) to get your multiplier to find your new fuel mass values. which is 2.68. so you would take 0.00059(fuel mass) multiply it by 2.68(multiplier) and your new flow would be 0.0015812(g/ms)

  18. #18
    Tuner in Training johnwrench's Avatar
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    60lbs/hr is 8 g/s at 43.5lbs at 58lbs make them 73lbs/hr 9.13 g/s divided by 1000 g/ms .00913 time by injector pulse values i may have done it wrong. i tried Multiply difference from stock to new but ran really bad
    2008 jeep Wrangler 3.8
    1995 trans Am ls1
    2011 volt

  19. #19
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    So theyre 73lb/hr at your fuel pressure? And its not going to run correctly until you change injector data along with adjusting the VE table.

  20. #20
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    This would be your miltiplier at 73lb/hr and your g/ms flow.
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