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Thread: LS2 GTO...Opinions on my min RAF changes and other ?s

  1. #1
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    LS2 GTO...Opinions on my min RAF changes and other ?s

    When I got my 06 M6 LS2 GTO back from the speed shop that dyno-tuned it I noticed I had idle problems not there before I took it in. This was not my first cam or tune from them (I installed all parts). I went from the Torquer v3 231/234 643/595 111+3 with stock heads to a slightly bigger custom cam 236/238 601/605 113+3(look familiar?) with only 0.5 degrees more overlap, with aftermarket heads and intake manifold. See sig for current mods.

    My current set up (with the old "Torquer v3" tune) would idle hunt intermittently before taking it to the speed shop. When I got the car back my idle was now set to 850 (was 825 before) and timing would read 17-25 degrees, however, after driving it would hang at 1,000rpms with timing holding steady at 12 degrees (all occurring while speed was 0 mph). I also experienced newfound "cruise control" at parking lot speeds in 1st gear: when the clutch was pushed in while crusing in 1st gear the rpms would go up to 1800 before returning to idle. Then the idle speed was 1,000 and would drop down to 850 after a couple of minutes at idle. But, idle hunting was gone. I suspected too much airflow and found airflow had been increased when comparing tune files. I turned adaptive spark off by highlighting "ON" in my scanner and the idle speed immediately increased to 1100 rpm...I was right! So I copied my "Torquer v3 cam" min RAF table and pasted it to the "new tune...hanging idle" file and BAM! Idle was perfect. No hanging at 1000, no "cruise control", and idle hunt was not experienced either. As far as I can tell it's as good as when the car was stock. Renamed the tune "New tune but with Torquer v3 min RAF to fix idle".

    My first question: did changing the RAF table possibly have any bad affect on any part of my tune OR possibly cause any type of unsafe condition for my engine? My fuel trims are unchanged...so I'm just being a little paranoid, I guess

    2) Shouldn't I horizontally interpolate the two cells that read zero in my RAF table?

    3) Isn't my VE table too rough? I don't have a wideband yet but I have the Pro version and a bung already made into my header...I plan to start tuning VE using fuel trims for now to fix my +10 LTFTs.

    4) Notice the bucking at 1500 rpms at 40 mph. I plan to tune VE and will then try lower timing in these bucking(sp?) cells. Should I tune lo MAF here too?



    I pretty much know what needs to be done, but some feedback/comments before I proceed would be appreciated since this is my first attempt to tune (but not my first visit to this forum).

    Any other comments are more than welcome!
    Last edited by AbsolvedJD; 04-20-2012 at 02:22 PM.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  2. #2
    Senior Tuner 5_Liter_Eater's Avatar
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    Do a search for threads started by me containing "towel" in the title. There is a 4th gen idle tuning procedure there.
    Bill Winters

    Former owner/builder/tuner of the FarmVette
    Out of the LSx tuning game

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    Thanks for replying Bill. I've read many of your posts, including the one you mention. They are always very informative! I will do your idle tuning procedure in the next few days to see how far off I am with it, but it idles and transisitions to idle almost like stock now. I guess I was just wondering if the RAF table could create a lean condition. According to my fuel trims it hasn't though...

    Thanks again!


    edit: RE-ATTACHED tune and log files. I swear they were there when I hit "post" originally!
    Last edited by AbsolvedJD; 04-20-2012 at 02:24 PM.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  4. #4
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    RAF tables are for idle. Check your Throttle cracker tables for the cruise issues..

  5. #5
    Senior Tuner 5_Liter_Eater's Avatar
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    No throttle cracker for gen 4's bra. Go smoke another one. LOL
    Bill Winters

    Former owner/builder/tuner of the FarmVette
    Out of the LSx tuning game

  6. #6
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    Ooops sorry!! My mistake. Im a bit "slow " today..
    Last edited by Asylumwarp; 04-20-2012 at 09:20 PM.

  7. #7
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    Haha. It's cool. It would probably be easier to tune the idle if it was set up that way!
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  8. #8
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    Should I be registering MAF numbers on my scanner if the MAf is failed by setting both numbers to zero? MAF is still plugged in.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  9. #9
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    DFCO and CFCO are disabled...
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  10. #10
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    Post a tune, makes it easier. Yes, the maf will register.. But, did you disable it correctly?
    Thanks,

    Dustin

  11. #11
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    It shows tunes and logs posted on my screen. I disabled it by setting both fail numbers to zero.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  12. #12
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    Under engine diag, airflow, set your MAF fail high to 10, low to 5, that should Disable maf.. P103 you have as error first so your good there. Your VE table is awefully bumpy. See it in 3d. Your MAF curve is kinda wack too in the high area. It should maintain usually a smooth curve. BUT not always.
    Thanks,

    Dustin

  13. #13
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    I'll try those fail numbers to see what happens but the ls2 guide on here says to put both numbers to zero?

    And should I just "smooth selection" on the whole VE table?

    Also, I'm gonna tune then smooth that MAF this weekend.

    I wish I had a dang wideband
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  14. #14
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    Hmm, if you dont have a wideband, your kinda hunting for a needle in the dark with a candle half burning..
    Thanks,

    Dustin

  15. #15
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    My thoughts exactly.

    I've gotten most of the bucking tamed by tuning my VE table using fuel trims as instructed in the LS2 guide on here. Most improvements came from reducing timing in the affected cells to 22 degrees. The timing no longer oscillates at 1500 rpm like it used to but there is still a "jiggle", with occassional bucking still experienced.

    I also smoothed the MAF lo table at 4150(bucking area), among other things.



    See attached logs and tunes. First tune is the one the speed shop gave me that drove like crap. I guess all 11 miles they put on it were on the dyno?
    Secong tune is the current one... much better!


    QUESTION: Should my STFTs ocsillate like they do during cruising? "Jiggling" is felt when they are doing it.

    Last log is me walking a beautiful 2012 red M6 Corvette two times in a row. My clutch didn't like it very much! I went from a 3rd gear punch(cuz i get sideways from a 2nd gear/40 mph punch) and he was in second but I still got him.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  16. #16
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    Latest tune attached. Fattened the VE in the problem areas and smoothed it. A little better...
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq

  17. #17
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    LC1 installed and working. Histograms set up and working properly. TIME TO TUNE! But 10.8 at WOT? And 13.5 at idle? Set at 1/12th timing, which produced the most consistent numbers. Logs to come soon.
    CURRENT SETUP: 2001 M6 WS6 228/236 112+3 XER lobes, P1SC/Aster/8lbs, Weiand intake, Long tubes, SD 60 lb inj, Lonnie's dual fuel pumps, HPtuners Pro---No #'s

    OLD SETUP: 2006 M6 GTO 236/238 113+3, FAST 102, TEA TFS 225s, Kooks, Wretched H-Pipe, Flowmaster Super 40s---484 rwhp/439 rwtq