Would Like Some Input Please!!
11-10-2004, 08:11 PM
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Would Like Some Input Please!! I have an STS turbo on my 6.0L truck at 5 psi boost. I have been trying to fine tune my PCM. I have it close but I keep hitting a wall. It pulls real hard up to about 4500 RPM at WOT and then it falls on its face. I have no KR and the LTFT are right around 950. Sometimes they go up to 970 for a short time. My timing is set at 16 deg. This seems a lttle low for me. Any suggestions? This is a WOT run from 20 MPH...
KR O2 1 O2 2 1 FT Cell Timing (RPM)
0 930 933 15 21.5 2471
0 955 959 15 20 3261
0 970 968 15 15 3688
0 970 977 15 14 4131
0 970 977 15 16 4453
0 955 963 15 15.5 4660
0 945 968 15 16.5 4918
0 905 972 15 17.5 4802
0 965 963 15 15 3673
0 965 955 15 15 3837
0 955 959 15 12.5 4023
0 965 955 15 15 4157
0 965 963 15 16 4284
0 960 946 15 16 4253
0 955 955 15 16 4378
0 955 955 15 16 4458
0 945 950 15 16 4562
0 935 942 15 16 4677
0 930 946 15 16 4766
0 835 872 3 47.5 4365
0 770 803 3 46.5 2895
0 875 890 21 45 2452
0 870 855 3 42.5 2160
0 650 130 2 30.5 1324
KR O2 1 O2 2 1 FT Cell Timing (RPM)
0 930 933 15 21.5 2471
0 955 959 15 20 3261
0 970 968 15 15 3688
0 970 977 15 14 4131
0 970 977 15 16 4453
0 955 963 15 15.5 4660
0 945 968 15 16.5 4918
0 905 972 15 17.5 4802
0 965 963 15 15 3673
0 965 955 15 15 3837
0 955 959 15 12.5 4023
0 965 955 15 15 4157
0 965 963 15 16 4284
0 960 946 15 16 4253
0 955 955 15 16 4378
0 955 955 15 16 4458
0 945 950 15 16 4562
0 935 942 15 16 4677
0 930 946 15 16 4766
0 835 872 3 47.5 4365
0 770 803 3 46.5 2895
0 875 890 21 45 2452
0 870 855 3 42.5 2160
0 650 130 2 30.5 1324
Last edited by jnybbad; 11-10-2004 at 08:18 PM.
11-10-2004, 09:11 PM
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Your timing is actually getting pulled back very early.
Your fueling is too fat. I would check out the burst
knock params, I saw on a 5.3 that burst knock was
getting busy just on the RPM run-up. Increase the
delta CylAir threshold to something like what you find
in cars (0.02 or higher) and see if that makes the
"mystery retard" go away.
Because you are boosted, your spark advance tables
probably want a -lot- of work (they are just stupid,
from factory, in case you want to tow a house or
something). Ditto for PE mode delays etc. If you're
a sport-truck'n type you probably want to borrow
a lot from F-body tunes.
Your fueling is too fat. I would check out the burst
knock params, I saw on a 5.3 that burst knock was
getting busy just on the RPM run-up. Increase the
delta CylAir threshold to something like what you find
in cars (0.02 or higher) and see if that makes the
"mystery retard" go away.
Because you are boosted, your spark advance tables
probably want a -lot- of work (they are just stupid,
from factory, in case you want to tow a house or
something). Ditto for PE mode delays etc. If you're
a sport-truck'n type you probably want to borrow
a lot from F-body tunes.