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Thread: SD tune im at the end of my rope!!!

  1. #1
    Tuner in Training
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    SD tune im at the end of my rope!!!

    2004 GMC sierra 6.0 222/225 Howard Cam.
    So I gutted my cats and went to a speed density OS which has enhanced Ve up to 105 kpa but when im in WOT and up into 105 kpa its commanding 4 AFR truck falls on its face and sometimes stalls, ive disabled COT,PE, everything I can think and did notice the flow rate vs kpa injector tab only goes to 80kpa could this be throwing my ecm into the problem? When im logging and special function command like 13 AFR it runs great pulls hard all the way up threw 105 on the scanner!!! ill attach latest tune and log, thanks Darren P.s ive tried 2 stock MAP sensors same thing, surely my cammed 6.0 cant be maxxing out a 1 bar map??
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  2. #2
    Tuning Addict 5FDP's Avatar
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    Your MAP linear and offset settings are not stock for a 1 bar GM map sensor from that era.

    94.43 and 10.33 are the stock settings, I can confirm that on several files ranging from 2001 to 2006 trucks.
    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.

  3. #3
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    yes Ive been trying everything to see results should I put it back to factory?

  4. #4
    Senior Tuner Lakegoat's Avatar
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    Yes to your question above. Use 5fdp's numbers if you have a GM 1 bar map sensor.
    Your primary ve table falls off a cliff at 100kpa. At least make the 105 row equal to the 100 row. Your injector data is incorrect, Flow rate and offset.
    Spark table is really rough. Shouldn't cause your problem though. Torque mgt---ETC TPS chart should be 100 except the 0 row which will be 0 across. The other max torque table should be all 640--not some @300.
    Under Power Enrichment make EQ Ratio 1.18 across, and Ramp in 1.5000 or 2.0000. Don't turn off PE
    Last edited by Lakegoat; 08-08-2019 at 05:23 PM.
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8

  5. #5
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    EDIT: you were right i checked tune repository- (wrong offset) im running 25326903 denso flex injectors and get all kinds of results for injector data. every stock tune with those injectors says 33lbs across. thanks I will try the other things you mentioned. P.s I was trying to pull VE above 100 to see if it helped... ill change it back
    Last edited by Dran714; 08-08-2019 at 05:35 PM.

  6. #6
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    made injector data changes and fixed Map

    Quote Originally Posted by Lakegoat View Post
    Yes to your question above. Use 5fdp's numbers if you have a GM 1 bar map sensor.
    Your primary ve table falls off a cliff at 100kpa. At least make the 105 row equal to the 100 row. Your injector data is incorrect, Flow rate and offset.
    Spark table is really rough. Shouldn't cause your problem though. Torque mgt---ETC TPS chart should be 100 except the 0 row which will be 0 across. The other max torque table should be all 640--not some @300.
    Under Power Enrichment make EQ Ratio 1.18 across, and Ramp in 1.5000 or 2.0000. Don't turn off PE
    Made most of those changes ill add Pe in and log probably tomorrow, back when I had my tune dialed in the truck didn't take more than 1.13 PE but ill try it...

  7. #7
    Senior Tuner Lakegoat's Avatar
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    You don't have 33# across. At the end, yours increases. Go to the Denso site or call them and get the correct injector data. You are going to be chasing your tail forever without the correct data.
    If your truck doesn't take more than 1.13 PE, then your ve table is not correct. 14.68/1.13=12.99afr---kinda lean. 14.68/1.18=12.44afr. You should make sure your ve table is correct and not screw with the pe table to fix it.
    You are at 99kpa in the scanner and still at 14.5 afr as per your wideband--that's not good. Check your map reading with the key on, engine off. It should be around 100kpa.
    Last edited by Lakegoat; 08-09-2019 at 12:45 PM.
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8