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Thread: LTFT (New to the forum)

  1. #41
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Jul 2008
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    No, not to compensate.

    Tuning always goes better when your Trims/MAF/VE are tuned, but mechanical issues have to be solved first..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #42
    Joe (Moderator) joecar's Avatar
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    Is there a way to seal the exhaust leak, either exhaust putty or aluminum foil...?

  3. #43
    Senior Member
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    May 2011
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    Quote Originally Posted by joecar View Post
    Is there a way to seal the exhaust leak, either exhaust putty or aluminum foil...?
    Yes, I have sealed the drivers side header, I don't hear any leaking so I think its ok. I only had problems with the drivers side because the header was modified for the conversion, I also have my wide band in the drivers side collector and it show about a 14.5 at idle.

    What I can do is go open loop (AUTOVE) and use my LM1 in the passenger side O2 sensor position, this way I know there are no exhaust leaks. I don't think I really need to run closed loop.

  4. #44
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    Got the car running quite well today, I modified Cranking VE + some mixture parameters and that fixed my warm start problem, the car no longer stalls after I installed and calibrated VSS. I'm preparing to do a AutoVE, I installed my LM1 in the right hand collector and it tracks very close to the LC1 in the left collector, this tells me that I either have two equal exhaust leaks or I fixed the LH exhaust leak. I copied a VE table form a tune file utilizing 333-333 cam, I'm using a 226-229, I see no LTFT above 3K but am seeing some below.

    I'm going through the AutoVE tutorial, one I get it figured out and executed I think it will fix my LTFT variances.

    I'm probably going to have to pull my tranny and get my Flywheel, PP and Clutch balanced, i have a bad vibration coming through my shifter from 2k up.

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