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!