Knock and high INJ DC. 550's, GM MAS.

mhuffman · 06-19-2008, 03:24 PM

I am having lots of "knock" and terrible timing. Mods in profile. I'm running 15psi, GM MAS w/ v2.02 MAF-T, rewired stock fuel pump, RC 550cc injectors. Ported 14b turbo.

Run 1:

TIMA O2-R TPS MAFS RPM KNCK INJP INJDC
22° 0.04V 17.3% 138.4Hz 2281 0 2.56ms 6
36° 0.92V 35.7% 201.3Hz 2469 0 4.61ms 12
30° 0.02V 42.4% 295.6Hz 2406 0 5.12ms 13
29° 0.02V 55.3% 320.8Hz 2500 0 6.91ms 18
28° 0.88V 100.0% 371.1Hz 2563 0 7.42ms 20
28° 0.92V 100.0% 390.0Hz 2594 0 7.68ms 21
27° 0.94V 100.0% 421.4Hz 2656 0 8.19ms 23
27° 0.94V 100.0% 446.6Hz 2688 0 8.45ms 24
26° 0.94V 100.0% 478.0Hz 2781 0 8.19ms 24
26° 0.92V 100.0% 515.8Hz 2844 0 8.70ms 26
24° 0.90V 100.0% 553.5Hz 2906 0 8.96ms 27
23° 0.90V 100.0% 610.1Hz 2969 0 10.24ms 32
22° 0.90V 100.0% 673.0Hz 3063 0 11.01ms 36
21° 0.92V 100.0% 735.9Hz 3156 6 12.03ms 40
18° 0.92V 100.0% 773.7Hz 3219 6 13.57ms 46
15° 0.94V 100.0% 880.6Hz 3375 6 15.36ms 55
14° 0.94V 100.0% 975.0Hz 3531 5 16.13ms 60
13° 0.94V 100.0% 1056.7Hz 3625 5 16.38ms 63
13° 0.96V 100.0% 1094.5Hz 3719 5 16.13ms 64
11° 0.94V 100.0% 1151.1Hz 3938 13 16.90ms 71
11° 0.94V 100.0% 1182.5Hz 3938 13 17.41ms 73
11° 0.94V 100.0% 1226.6Hz 4000 13 17.41ms 74
11° 0.94V 100.0% 1302.0Hz 4125 12 17.92ms 78
11° 0.94V 100.0% 1333.5Hz 4250 12 18.18ms 82
11° 0.94V 100.0% 1396.4Hz 4344 12 18.94ms 87
11° 0.94V 100.0% 1415.3Hz 4375 11 18.94ms 88
12° 0.94V 100.0% 1490.7Hz 4531 11 19.71ms 95
13° 0.94V 100.0% 1566.2Hz 4688 11 19.71ms 98
12° 0.94V 100.0% 1604.0Hz 4719 10 19.97ms 100
13° 0.94V 100.0% 1604.0Hz 4781 10 20.22ms 103
14° 0.94V 100.0% 1604.0Hz 4969 10 20.22ms 107
14° 0.92V 100.0% 1604.0Hz 5063 10 19.97ms 108
15° 0.92V 100.0% 1604.0Hz 5031 14 19.71ms 105
13° 0.92V 100.0% 1604.0Hz 5188 14 19.71ms 109
14° 0.92V 100.0% 1604.0Hz 5344 14 19.71ms 112
14° 0.92V 100.0% 1604.0Hz 5406 13 19.97ms 115
14° 0.92V 100.0% 1604.0Hz 5563 13 19.71ms 117
15° 0.92V 100.0% 1604.0Hz 5469 13 19.71ms 115
15° 0.92V 100.0% 1604.0Hz 5594 13 19.71ms 117
16° 0.92V 100.0% 1604.0Hz 5844 13 19.71ms 123
16° 0.92V 100.0% 1604.0Hz 5750 13 19.46ms 119
16° 0.92V 100.0% 1604.0Hz 5938 13 19.46ms 123
17° 0.92V 100.0% 1604.0Hz 5969 19 19.46ms 124
15° 0.92V 100.0% 1604.0Hz 5906 19 19.46ms 122
14° 0.92V 99.6% 1604.0Hz 6094 19 19.46ms 126
15° 0.90V 88.2% 1604.0Hz 6125 19 19.20ms 125
14° 0.92V 29.4% 1572.5Hz 5781 18 1.28ms 7
30° 0.70V 17.6% 239.0Hz 5375 6 1.79ms 10
45° 0.66V 17.3% 119.5Hz 4906 0 1.28ms 6
45° 0.66V 17.3% 106.9Hz 4469 0 1.54ms 7
43° 0.47V 17.3% 88.1Hz 3594 0 1.28ms 4
40° 0.47V 17.3% 69.2Hz 3688 0 1.28ms 5

Run 2:

TIMA O2-R TPS MAFS RPM KNCK INJP INJDC
23° 0.84V 53.3% 295.6Hz 2063 2 6.14ms 13
24° 0.82V 63.9% 314.5Hz 2188 2 7.17ms 16
25° 0.88V 100.0% 333.4Hz 2281 1 7.42ms 18
25° 0.92V 100.0% 364.8Hz 2406 1 7.68ms 19
27° 0.92V 100.0% 390.0Hz 2500 1 7.94ms 21
25° 0.92V 100.0% 427.7Hz 2656 0 8.19ms 23
27° 0.92V 100.0% 471.8Hz 2781 0 8.19ms 24
26° 0.92V 100.0% 528.4Hz 2969 0 8.45ms 26
26° 0.90V 100.0% 597.6Hz 3125 0 9.22ms 30
24° 0.88V 100.0% 679.3Hz 3313 0 10.24ms 36
24° 0.90V 100.0% 773.7Hz 3438 4 12.29ms 45
21° 0.92V 100.0% 918.3Hz 3656 14 14.59ms 57
13° 0.94V 100.0% 1107.0Hz 4031 14 16.64ms 71
12° 0.94V 100.0% 1327.2Hz 4313 14 18.43ms 84
11° 0.94V 100.0% 1490.7Hz 4469 13 19.20ms 91
11° 0.92V 100.0% 1572.5Hz 4750 13 19.46ms 98
13° 0.92V 100.0% 1604.0Hz 5063 13 19.46ms 105
13° 0.92V 100.0% 1604.0Hz 5250 13 19.46ms 109
15° 0.92V 100.0% 1604.0Hz 5625 12 19.46ms 116
16° 0.92V 100.0% 1604.0Hz 5625 12 19.46ms 116
17° 0.90V 100.0% 1604.0Hz 5781 12 19.20ms 118
17° 0.90V 100.0% 1604.0Hz 5938 12 19.20ms 121
17° 0.90V 100.0% 1604.0Hz 6000 19 18.94ms 121
14° 0.90V 100.0% 1604.0Hz 6063 19 18.94ms 122
13° 0.90V 100.0% 1604.0Hz 6438 19 18.69ms 128
12° 0.90V 100.0% 1604.0Hz 6469 18 18.43ms 127
11° 0.90V 100.0% 1604.0Hz 6563 18 18.18ms 127
11° 0.90V 100.0% 1604.0Hz 6875 18 17.92ms 131
10° 0.90V 100.0% 1604.0Hz 6906 18 17.66ms 130
10° 0.90V 100.0% 1604.0Hz 6906 17 17.15ms 126
11° 0.90V 63.5% 1604.0Hz 7063 17 5.12ms 38
26° 0.68V 17.3% 239.0Hz 6313 7 1.79ms 12
44° 0.74V 100.0% 723.4Hz 4938 0 9.73ms 51
28° 0.86V 100.0% 924.6Hz 4844 1 13.06ms 67
23° 0.92V 100.0% 1295.7Hz 4813 1 18.18ms 93
17° 0.92V 100.0% 1604.0Hz 5094 6 19.71ms 107
16° 0.92V 100.0% 1604.0Hz 5000 6 19.46ms 103
16° 0.92V 100.0% 1604.0Hz 5156 6 18.94ms 104
17° 0.92V 100.0% 1604.0Hz 5344 5 18.94ms 108
17° 0.92V 100.0% 1604.0Hz 5281 5 18.94ms 106
15° 0.92V 100.0% 1604.0Hz 5406 19 18.94ms 109
12° 0.90V 100.0% 1604.0Hz 5406 19 19.20ms 110
13° 0.90V 100.0% 1604.0Hz 5656 18 19.20ms 116
15° 0.90V 100.0% 1604.0Hz 5563 18 18.94ms 112
15° 0.90V 100.0% 1604.0Hz 5688 18 18.94ms 115
15° 0.90V 100.0% 1604.0Hz 5781 17 18.94ms 117
16° 0.90V 100.0% 1604.0Hz 5906 17 18.69ms 117
15° 0.90V 100.0% 1604.0Hz 5875 17 18.94ms 118
16° 0.90V 100.0% 1604.0Hz 5938 17 18.69ms 118
14° 0.90V 100.0% 1604.0Hz 6000 22 18.69ms 119
14° 0.90V 17.6% 1390.1Hz 5625 22 2.56ms 15
28° 0.70V 17.3% 195.0Hz 5406 9 1.54ms 8

spyderturbo007 · 06-20-2008, 09:24 AM

Have you checked for boost leaks? Your logs are showing IDC's way over 120%, which isn't normal with 550cc injectors running 15psi on the 14b.

mhuffman · 06-20-2008, 03:26 PM

Quote:

Originally Posted by spyderturbo007

Have you checked for boost leaks? Your logs are showing IDC's way over 120%, which isn't normal with 550cc injectors running 15psi on the 14b.

I thought so. i richened things up and got rid of most of the knock. the only issue now is high INJ DC. i will be checking for boost leaks next week. do boost leaks help lead to high INJ DC?

So, richening up the MAF-T two cliks on the WOT knob helped reduce knock to just 4 counts from 22.

I am running a MBC with a small hole in it that leaks boost above the set point. Could this be a contributing factor?

My91TalonTSi · 06-22-2008, 05:19 PM

Quote:

Originally Posted by mhuffman

I thought so. i richened things up and got rid of most of the knock. the only issue now is high INJ DC. i will be checking for boost leaks next week. do boost leaks help lead to high INJ DC?

So, richening up the MAF-T two cliks on the WOT knob helped reduce knock to just 4 counts from 22.

I am running a MBC with a small hole in it that leaks boost above the set point. Could this be a contributing factor?

I would consider a fuel pump upgrade after checking for boost leaks and fixing any issues. My fuel system couldn't handle anything over 16psi when I had my 14b, stock pump, and 450's.

mhuffman · 06-23-2008, 09:02 PM

I have some small boost leaks and significant leaks from two of 4 injector insulators. however, i can get almost 15psi pumped into it with the car tire pump.

i guess a 190lph walboro would help. i cant see how they are so high with only 14b and 15psi.

spyderturbo007 · 07-03-2008, 09:19 AM

Sorry, I've been slacking around here because of how busy I've been at work.

Anyway, fix the boost leaks and your IDC's will come down. Boost leaks cause rich conditions. The larger the leak, the richer things will be.