Drew778

iTrader: (2)

I'm getting 24 to 28 spark with a little detonation using 103 race gas.

I'm using NGK TR-6's gapped at .035.

Could it be do to the LS-6 MAF?

I have some logs, I'm olny getting KR in 3rd gear:
IAT IGN LFT1 LFT2 MPH O2L O2R RPM KR


95.0 26 5.47 4.69 39.8 945 965 5908 0
93.2 26 5.47 4.69 46.6 950 965 6396 0
91.4 27 5.47 4.69 65.9 945 950 5209 0
89.6 26 5.47 4.69 59.0 935 965 5037 0
87.8 26 5.47 4.69 64.6 940 970 5196 0
87.8 26 5.47 4.69 69.0 945 970 5402 0
86.0 26 5.47 4.69 73.9 965 960 5690 0
86.0 27 5.47 4.69 78.9 955 970 5993 0
84.2 27 5.47 4.69 83.3 960 965 6239 0
84.2 26 5.47 4.69 87.0 950 980 5764 0
84.2 25 5.47 4.69 90.1 950 975 4991 0
82.4 25 5.47 4.69 93.8 950 985 5041 0
82.4 23 5.47 4.69 96.3 960 980 5113 1.98
82.4 23 5.47 4.69 100.0 955 990 5168 1.81
80.6 24 5.47 4.69 103.8 960 985 5205 1.64
80.6 24 5.47 4.69 105.6 960 985 5254 1.55
80.6 24 5.47 4.69 108.1 960 990 5308 1.47
80.6 24 5.47 4.69 110.6 945 985 5355 1.38
80.6 24 5.47 4.69 113.1 950 985 5396 1.29
80.6 25 5.47 4.69 116.2 950 985 5498 1.21
80.6 25 5.47 4.69 118.1 935 975 5584 1.12
78.8 25 5.47 4.69 120.6 935 985 5673 1.04
78.8 25 5.47 4.69 123.0 940 985 5762 0.95
78.8 25 5.47 4.69 124.9 940 970 5820 0.86
78.8 26 5.47 4.69 126.8 935 985 5889 0.86

lbz34

iTrader: (3)

I would suggest either switching to c-16 or equivalent race gas (phillips 118), or pulling a tad of timing. I personally would not worry about that amount of knock retard. I regularly run 28 deg. (ls1 edit) and reguarly see 31 deg. on the 150 nx maf with no KR on c-16 gas. Just some of my experience.

Drew778

iTrader: (2)

Thanks, I was checking the plugs after every run and I could see the little detonation spots on the plug.

I did use a little C-16 on top of the 103, next time I'll have to use a little more.