Strange situation -- after shift car holds an RPM then feels like it got kicked
08-24-2004, 02:50 PM
#1
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Thread Starter
Strange situation -- after shift car holds an RPM then feels like it got kicked ok, i'm having some strange issues w/my car... and I think it's ignition related somehow but not sure
Basically after a shift (sometimes is worse than others but seems to do it much of the time... does it worse on HARD launches it seems but haven't verified) it'll hold an RPM , not getting much faster for a long period of time, then suddenly it feels like someone kicked the car in the ***... you can feel it and hear it
Here's the log:
Time Engine RPM (SAE) rpm Vehicle Speed (SAE) mph Throttle Position (SAE) % Ignition Timing Advance (SAE) ° Knock Retard ° Mass Air Flow (SAE) lb/min Manifold Absolute Pressure (SAE) psi Engine Coolant Temp (SAE) °F Intake Air Temp (SAE) °F O2 Sensor Bank 1 Sensor 1 mV O2 Sensor Bank 2 Sensor 1 mV INJ. Pulse Width Avg. Bank 1 msec INJ. Pulse Width Avg. Bank 2 msec
13:42:34:663 5711 52 100 25.5 0 33.66 13.78 190 111 885 894 10.3 10.5
13:42:34:763 5235 49 100 25.5 0 36.64 14.07 190 111 924 894 10.8 10.7
13:42:34:863 5013 50 100 25.5 0 19.88 14.36 190 111 924 890 10.3 10.3
13:42:34:973 5009 51 100 25.5 0 23.38 13.49 190 111 911 890 10.1 10.1
13:42:35:074 5039 52 100 25.5 0 38.23 13.64 190 111 898 898 10.4 10.4
13:42:35:174 5086 53 100 25.5 0 39.15 13.78 190 111 903 898 10.7 10.8
13:42:35:274 5094 53 100 25.5 0 28 13.93 190 111 924 903 10.8 10.8
13:42:35:364 5119 55 100 25.5 0 23.18 14.36 190 111 920 894 10.7 10.5
13:42:35:464 5198 55 100 25.5 0 30.38 13.93 190 111 803 907 10.6 10.7
13:42:35:554 5268 57 100 25.5 0 40.16 13.93 190 111 894 907 11.2 11.3
13:42:35:654 5311 57 100 25.5 0 36.22 13.93 190 108 933 911 11.6 11.7
13:42:35:755 5485 58 100 25.5 0 37.96 13.78 190 108 920 916 11.9 12
and
13:42:38:088 6502 78 100 26.5 0 31.86 13.49 190 100 916 907 10 9.7
13:42:38:188 6530 78 100 26.5 0 37.03 13.49 190 99 938 920 9.7 10
13:42:38:298 6507 80 100 26.5 0 127.93 14.07 190 99 924 864 10.1 9.9
13:42:38:388 5713 81 100 26.5 0 34.28 13.93 190 99 938 885 10.4 10.3
13:42:38:488 5211 81 100 26.5 0 31.35 13.64 190 99 920 916 10.1 10.3
13:42:38:589 5067 81 100 26.5 0 38.86 13.93 190 99 924 924 10.5 10.6
13:42:38:689 5022 81 100 26.5 0 36.64 14.07 192 97 942 911 10.7 10.7
13:42:38:789 5039 82 100 26.5 0 34.92 13.93 192 97 942 911 10.7 10.6
13:42:38:889 4986 83 100 26.5 0 20.52 14.07 192 97 946 907 10.4 10.4
13:42:38:979 5022 83 100 26.5 0 23.1 14.07 192 97 916 916 10.2 10.2
13:42:39:079 5056 83 100 26.5 0 29.91 13.64 192 97 881 924 10.3 10.4
13:42:39:179 5070 84 100 26.5 0 38.49 13.93 192 97 924 929 10.7 10.6
13:42:39:280 5079 85 100 26.5 0 37.86 13.93 192 97 942 903 10.8 10.8
13:42:39:380 5058 85 100 26.5 0 27.15 14.36 192 97 946 916 10.7 10.4
13:42:39:480 5084 86 100 26.5 0 23.72 14.07 192 97 916 920 10.2 10.2
13:42:39:590 5110 86 100 26.5 0 37.23 13.64 192 97 916 920 10.4 10.3
13:42:39:690 5132 86 100 26.5 0 39.51 13.93 192 97 942 920 10.7 10.8
13:42:39:800 5106 87 100 26.5 0 27.72 13.93 192 97 951 911 10.7 10.7
13:42:39:931 5139 88 100 26.5 0 23.82 14.07 192 97 907 916 10.3 10.2
13:42:40:041 5164 88 100 26.5 0 38.77 13.78 192 97 916 924 10.7 10.7
13:42:40:141 5207 88 100 26.5 0 37.46 13.93 192 95 942 916 10.9 10.9
13:42:40:241 5166 89 100 26.5 0 28 14.22 192 95 907 920 10.9 10.9
13:42:40:341 5242 89 100 26.5 0 35.04 13.93 192 95 911 933 11.3 11.1
13:42:40:441 5381 90 100 26.5 0 37.46 13.78 192 95 942 920 11.6 11.6
13:42:40:541 5457 91 100 26.5 0 36.4 13.78 192 95 933 946 11.9 11.8
Actual csv file here:
http://www.transamws6.net/HPTuners/bin/787878.csv
you can see right after the shift, the RPM is fluctuating, staying around 5k, then all of a sudden it jumps 150 RPM and the car starts moving again
Its definetly an audible change... you can hear the car staying at the same RPM then taking off, and I can feel it push me back in my seat ...
Anyone have anything similar happen to them? suggestions?
I'll be changing plugs this weekend, as well as moving the coil packs around (I had noticed in some other logs that drivers side seemed to be running richer than passenger side) to see if I notice anything.... worst case I'm going to disable the MAF and try a few runs using Speed Density ... it's just weird how the car's acting... it has alot more in it... (11.8@114 on a 1.776 60ft but it's not going as fast as it should) just need to figure out what's up ... it's most pronounced after 2-3 shift which makes it hard to do real world testing outside the drag strip heh
Basically after a shift (sometimes is worse than others but seems to do it much of the time... does it worse on HARD launches it seems but haven't verified) it'll hold an RPM , not getting much faster for a long period of time, then suddenly it feels like someone kicked the car in the ***... you can feel it and hear it
Here's the log:
Time Engine RPM (SAE) rpm Vehicle Speed (SAE) mph Throttle Position (SAE) % Ignition Timing Advance (SAE) ° Knock Retard ° Mass Air Flow (SAE) lb/min Manifold Absolute Pressure (SAE) psi Engine Coolant Temp (SAE) °F Intake Air Temp (SAE) °F O2 Sensor Bank 1 Sensor 1 mV O2 Sensor Bank 2 Sensor 1 mV INJ. Pulse Width Avg. Bank 1 msec INJ. Pulse Width Avg. Bank 2 msec
13:42:34:663 5711 52 100 25.5 0 33.66 13.78 190 111 885 894 10.3 10.5
13:42:34:763 5235 49 100 25.5 0 36.64 14.07 190 111 924 894 10.8 10.7
13:42:34:863 5013 50 100 25.5 0 19.88 14.36 190 111 924 890 10.3 10.3
13:42:34:973 5009 51 100 25.5 0 23.38 13.49 190 111 911 890 10.1 10.1
13:42:35:074 5039 52 100 25.5 0 38.23 13.64 190 111 898 898 10.4 10.4
13:42:35:174 5086 53 100 25.5 0 39.15 13.78 190 111 903 898 10.7 10.8
13:42:35:274 5094 53 100 25.5 0 28 13.93 190 111 924 903 10.8 10.8
13:42:35:364 5119 55 100 25.5 0 23.18 14.36 190 111 920 894 10.7 10.5
13:42:35:464 5198 55 100 25.5 0 30.38 13.93 190 111 803 907 10.6 10.7
13:42:35:554 5268 57 100 25.5 0 40.16 13.93 190 111 894 907 11.2 11.3
13:42:35:654 5311 57 100 25.5 0 36.22 13.93 190 108 933 911 11.6 11.7
13:42:35:755 5485 58 100 25.5 0 37.96 13.78 190 108 920 916 11.9 12
and
13:42:38:088 6502 78 100 26.5 0 31.86 13.49 190 100 916 907 10 9.7
13:42:38:188 6530 78 100 26.5 0 37.03 13.49 190 99 938 920 9.7 10
13:42:38:298 6507 80 100 26.5 0 127.93 14.07 190 99 924 864 10.1 9.9
13:42:38:388 5713 81 100 26.5 0 34.28 13.93 190 99 938 885 10.4 10.3
13:42:38:488 5211 81 100 26.5 0 31.35 13.64 190 99 920 916 10.1 10.3
13:42:38:589 5067 81 100 26.5 0 38.86 13.93 190 99 924 924 10.5 10.6
13:42:38:689 5022 81 100 26.5 0 36.64 14.07 192 97 942 911 10.7 10.7
13:42:38:789 5039 82 100 26.5 0 34.92 13.93 192 97 942 911 10.7 10.6
13:42:38:889 4986 83 100 26.5 0 20.52 14.07 192 97 946 907 10.4 10.4
13:42:38:979 5022 83 100 26.5 0 23.1 14.07 192 97 916 916 10.2 10.2
13:42:39:079 5056 83 100 26.5 0 29.91 13.64 192 97 881 924 10.3 10.4
13:42:39:179 5070 84 100 26.5 0 38.49 13.93 192 97 924 929 10.7 10.6
13:42:39:280 5079 85 100 26.5 0 37.86 13.93 192 97 942 903 10.8 10.8
13:42:39:380 5058 85 100 26.5 0 27.15 14.36 192 97 946 916 10.7 10.4
13:42:39:480 5084 86 100 26.5 0 23.72 14.07 192 97 916 920 10.2 10.2
13:42:39:590 5110 86 100 26.5 0 37.23 13.64 192 97 916 920 10.4 10.3
13:42:39:690 5132 86 100 26.5 0 39.51 13.93 192 97 942 920 10.7 10.8
13:42:39:800 5106 87 100 26.5 0 27.72 13.93 192 97 951 911 10.7 10.7
13:42:39:931 5139 88 100 26.5 0 23.82 14.07 192 97 907 916 10.3 10.2
13:42:40:041 5164 88 100 26.5 0 38.77 13.78 192 97 916 924 10.7 10.7
13:42:40:141 5207 88 100 26.5 0 37.46 13.93 192 95 942 916 10.9 10.9
13:42:40:241 5166 89 100 26.5 0 28 14.22 192 95 907 920 10.9 10.9
13:42:40:341 5242 89 100 26.5 0 35.04 13.93 192 95 911 933 11.3 11.1
13:42:40:441 5381 90 100 26.5 0 37.46 13.78 192 95 942 920 11.6 11.6
13:42:40:541 5457 91 100 26.5 0 36.4 13.78 192 95 933 946 11.9 11.8
Actual csv file here:
http://www.transamws6.net/HPTuners/bin/787878.csv
you can see right after the shift, the RPM is fluctuating, staying around 5k, then all of a sudden it jumps 150 RPM and the car starts moving again
Its definetly an audible change... you can hear the car staying at the same RPM then taking off, and I can feel it push me back in my seat ...
Anyone have anything similar happen to them? suggestions?
I'll be changing plugs this weekend, as well as moving the coil packs around (I had noticed in some other logs that drivers side seemed to be running richer than passenger side) to see if I notice anything.... worst case I'm going to disable the MAF and try a few runs using Speed Density ... it's just weird how the car's acting... it has alot more in it... (11.8@114 on a 1.776 60ft but it's not going as fast as it should) just need to figure out what's up ... it's most pronounced after 2-3 shift which makes it hard to do real world testing outside the drag strip heh
08-24-2004, 03:26 PM
#4
TECH Senior Member
Thread Starter
well.. it could be a trans issue, but I don't think it is... if it was a trans issue and the trans was fighting that hard agains the engine I'd think it'd break something....
I'll have to check the TPS ...
I'll have to check the TPS ...
08-24-2004, 03:53 PM
#7
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Plateauing at 5000-5500 seems like a normal
characteristic of a 4400-range converter.
Don't know why you feel it's not pulling though.
Looking at the first WOT blast it looks like
continuous acceleration and pretty normal.
See pic of Excel plot from your data.
Maybe you have a short in your butt-o-meter
characteristic of a 4400-range converter.
Don't know why you feel it's not pulling though.
Looking at the first WOT blast it looks like
continuous acceleration and pretty normal.
See pic of Excel plot from your data.
Maybe you have a short in your butt-o-meter
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08-24-2004, 08:55 PM
#9
TECH Senior Member
Thread Starter
yup definetly not TM ... seems like the car's either loading up or not getting enough fuel after the shift... hopefully it's something simple like plugs or wires
08-24-2004, 09:52 PM
#11
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Thread Starter
i didn't notice that.... but yea... the areas it's being goofy the MAF values do look weird... and I set a p0101 code the other day for the first time....
08-25-2004, 07:48 AM
#12
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When I measured MAFs on a flow bench setup
I saw a lot of frequency noise (readings buzzing
around by maybe a couple of hundred Hz on
6KHz output). This may be natural although I
don't know how the PCM would stay sane.
Wonder if it is doing more sampling and some
internal smoothing too. The 127.9 value is an
obvious "sport".
I'm still missing, though, the problem - maybe I
just looked at the wrong section but on the
first WOT runup I charted there is no sign of
any dip in acceleration.
I saw a lot of frequency noise (readings buzzing
around by maybe a couple of hundred Hz on
6KHz output). This may be natural although I
don't know how the PCM would stay sane.
Wonder if it is doing more sampling and some
internal smoothing too. The 127.9 value is an
obvious "sport".
I'm still missing, though, the problem - maybe I
just looked at the wrong section but on the
first WOT runup I charted there is no sign of
any dip in acceleration.
08-25-2004, 09:44 AM
#14
TECH Senior Member
Thread Starter
OK, i got a log file from someone else running the same converter (smaller gears) and here's his 2-3 shift
11:43:07:677 6140 rpm 76 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 91 °F
11:43:07:777 6175 rpm 77 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 91 °F
11:43:07:877 6183 rpm 78 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 91 °F
11:43:07:977 6211 rpm 78 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 167 °F 90 °F
11:43:08:077 6224 rpm 79 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 90 °F
11:43:08:167 6242 rpm 80 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:268 6260 rpm 80 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:408 6216 rpm 81 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:508 5939 rpm 83 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:608 5835 rpm 83 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:708 5804 rpm 84 mph 100% 30.0 ° 0.0 ° 4.69 V 14.22 psi 169 °F 90 °F
11:43:08:788 5777 rpm 85 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 90 °F
11:43:08:888 5772 rpm 85 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:989 5770 rpm 86 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:089 5772 rpm 87 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 88 °F
11:43:09:199 5779 rpm 88 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 88 °F
11:43:09:289 5788 rpm 88 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:389 5797 rpm 89 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:489 5808 rpm 90 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:589 5802 rpm 91 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 86 °F
11:43:09:690 5811 rpm 91 mph 100% 30.0 ° 0.0 ° 4.67 V 14.07 psi 169 °F 86 °F
11:43:09:790 5826 rpm 92 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:890 5826 rpm 93 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:990 5838 rpm 93 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:080 5835 rpm 94 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 171 °F 86 °F
11:43:10:180 5849 rpm 94 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:280 5851 rpm 95 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:381 5854 rpm 96 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:481 5858 rpm 96 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:581 5865 rpm 97 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 171 °F 86 °F
11:43:10:691 5879 rpm 98 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:781 5881 rpm 98 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 171 °F 86 °F
11:43:10:881 5886 rpm 99 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:992 5895 rpm 99 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 84 °F
11:43:11:082 5900 rpm 100 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 171 °F 84 °F
his RPM barely drops below 5800 on the shift extension and he's shifting alot lower than I am ... so we're thinking the converter is locking on me... I'll have to check all the wires this weekend... at one time I did have a lockup switch installed... but I tore it out and taped over the splice... maybe it's grounding out somehow...
THe car's still accelerating... but not as hard as it should be... in the final 1/8 mile it pulls pretty good because it's past the issue RPM area... I pick up 24mph+ in the big end... but I'm not picking up enough mph in the first 1/8 mile... trapping 87-89, should be trapping 93-94 ... 1/8 mile is where all the shifting is, 1-2 and 2-3 ...
11:43:07:677 6140 rpm 76 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 91 °F
11:43:07:777 6175 rpm 77 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 91 °F
11:43:07:877 6183 rpm 78 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 91 °F
11:43:07:977 6211 rpm 78 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 167 °F 90 °F
11:43:08:077 6224 rpm 79 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 167 °F 90 °F
11:43:08:167 6242 rpm 80 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:268 6260 rpm 80 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:408 6216 rpm 81 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 167 °F 90 °F
11:43:08:508 5939 rpm 83 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:608 5835 rpm 83 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:708 5804 rpm 84 mph 100% 30.0 ° 0.0 ° 4.69 V 14.22 psi 169 °F 90 °F
11:43:08:788 5777 rpm 85 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 90 °F
11:43:08:888 5772 rpm 85 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 90 °F
11:43:08:989 5770 rpm 86 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:089 5772 rpm 87 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 88 °F
11:43:09:199 5779 rpm 88 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 88 °F
11:43:09:289 5788 rpm 88 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:389 5797 rpm 89 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 88 °F
11:43:09:489 5808 rpm 90 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:589 5802 rpm 91 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 169 °F 86 °F
11:43:09:690 5811 rpm 91 mph 100% 30.0 ° 0.0 ° 4.67 V 14.07 psi 169 °F 86 °F
11:43:09:790 5826 rpm 92 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:890 5826 rpm 93 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 169 °F 86 °F
11:43:09:990 5838 rpm 93 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:080 5835 rpm 94 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 171 °F 86 °F
11:43:10:180 5849 rpm 94 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:280 5851 rpm 95 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:381 5854 rpm 96 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:481 5858 rpm 96 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:581 5865 rpm 97 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 171 °F 86 °F
11:43:10:691 5879 rpm 98 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:781 5881 rpm 98 mph 100% 30.0 ° 0.0 ° 4.67 V 14.36 psi 171 °F 86 °F
11:43:10:881 5886 rpm 99 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 86 °F
11:43:10:992 5895 rpm 99 mph 100% 30.0 ° 0.0 ° 4.67 V 14.22 psi 171 °F 84 °F
11:43:11:082 5900 rpm 100 mph 100% 30.0 ° 0.0 ° 4.69 V 14.36 psi 171 °F 84 °F
his RPM barely drops below 5800 on the shift extension and he's shifting alot lower than I am ... so we're thinking the converter is locking on me... I'll have to check all the wires this weekend... at one time I did have a lockup switch installed... but I tore it out and taped over the splice... maybe it's grounding out somehow...
THe car's still accelerating... but not as hard as it should be... in the final 1/8 mile it pulls pretty good because it's past the issue RPM area... I pick up 24mph+ in the big end... but I'm not picking up enough mph in the first 1/8 mile... trapping 87-89, should be trapping 93-94 ... 1/8 mile is where all the shifting is, 1-2 and 2-3 ...
08-25-2004, 10:08 AM
#15
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I notice that your MAP reading is well below this other
guy's. Are you at higher elevation? The engine power
(torque) output will affect how much "RPM stretch"
you develop across the converter as will some
piece-to-piece stall/slip variation, weight & gearing,
etc. This other guy also enjoys much more timing
advance, lower ECT and IAT than you do (again
pointing to engine output power as a factor in shift
extension & RPM stretch).
guy's. Are you at higher elevation? The engine power
(torque) output will affect how much "RPM stretch"
you develop across the converter as will some
piece-to-piece stall/slip variation, weight & gearing,
etc. This other guy also enjoys much more timing
advance, lower ECT and IAT than you do (again
pointing to engine output power as a factor in shift
extension & RPM stretch).
08-25-2004, 10:38 AM
#16
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his car is running on a Speed Density tune, but the log was from the same day, same track (cordova) ... though... his car is an 11.02 stock internal car though heh (90mm TB, LSX intake) and weighing in 500-600lbs lighter than me heh
08-25-2004, 03:39 PM
#17
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Taking a look at the MAP vs RPM you have a lot of
MAP fade, which is ponies not hitched to the cart.
I wonder why your MAP is so low relative to your buddy.
Have to figure either an inlet tract restriction or a bad
sensor / reading. Do not know your BARO baseline,
which if you compare to his might indicate whether
you are seeing a sensor error, or manifold pressure
drop under flow. Latter being blade angle, unported TB,
screened MAF, dirty air filter, dead racoon in the
SSRA scoop, etc.
But this all appears to have little to do with the
original question - just a side observation.
Now I'm looking at the earlier pull - around line 350. Here
I see some freaky stuff. First, looks like you got into
some strong wheelspin - speed column jumps up from
46 to 71 in one tick, between line 362 and 363. Right
there you also see some large KR, and I bet this has
also activated traction control spark pullout, maybe the
ABS brake action as well, if you left ASR on? Also looks
like maybe some fuel cutoff, your injector PW drops
by 2mS while your RPMs look like they're up near the
rev limit?
MAP fade, which is ponies not hitched to the cart.
I wonder why your MAP is so low relative to your buddy.
Have to figure either an inlet tract restriction or a bad
sensor / reading. Do not know your BARO baseline,
which if you compare to his might indicate whether
you are seeing a sensor error, or manifold pressure
drop under flow. Latter being blade angle, unported TB,
screened MAF, dirty air filter, dead racoon in the
SSRA scoop, etc.
But this all appears to have little to do with the
original question - just a side observation.
Now I'm looking at the earlier pull - around line 350. Here
I see some freaky stuff. First, looks like you got into
some strong wheelspin - speed column jumps up from
46 to 71 in one tick, between line 362 and 363. Right
there you also see some large KR, and I bet this has
also activated traction control spark pullout, maybe the
ABS brake action as well, if you left ASR on? Also looks
like maybe some fuel cutoff, your injector PW drops
by 2mS while your RPMs look like they're up near the
rev limit?
