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VCDS (aka Vagcom) For all your electronic debug / diag advice queries and mods. |
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#1
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changed o2 sensor so did some logging. (Stat heavy!)
after a day on the tools yesterday, changing the passenger side lambda sensor i thought it prudent to go for a drive this morning and check everything was ok. ive not really used VCDS in anger before, aside from re-coding the RNS-E when i upgraded the stereo it has just sat there.
today, that changed. and my one word review is: "WOW". the things you can monitor and log (not just with the engine!) are amazing this is 0-100kph run whilst logging some of the transmission parameters: Code:
4D0 927 156 DG AG5 01L 4.2l5V RdW 0708 Group A: 001 Group B: 002 Group C: 003 Engine RPM Input RPM Output RPM Trans. Gear Actual Program Throttle value Trans. Output RPM Trans. Gear Brake Light Switch Shift Solenoid Vehicle speed Voltage Supply TIME G182 (0-8200) G195 (0-8200) TIME DS/WL/AS/TP/GR % of WOT G195 (0-8200) TIME Km/hr Tmnl 15 (10-16v) Marker STAMP /min /min /min STAMP % /min STAMP km/h V 48.53 672 0 0 1m 48.81 DS 15.6 0 1m 49.09 PN Inactive 0 13.7 49.38 1728 576 160 1m 49.65 DS 100 288 1m 49.93 PN Inactive 12 13.76 50.22 2688 2208 608 1m 50.49 DS 100 736 1m 50.78 PN Inactive 26 13.95 51.06 4000 3776 1056 1 51.33 DS 100 1184 1 51.62 PN Inactive 40 13.63 51.89 5440 5248 1472 1 52.18 DS 100 1600 1 52.46 PN Inactive 52 13.82 52.75 6688 6528 1824 1 53.02 DS 100 1888 1 53.3 PN Inactive 64 13.7 53.59 5664 5440 2112 1 53.86 DS 100 2176 1 54.15 PN Inactive 72 13.5 54.43 5440 5216 2368 1 54.71 DS 100 2432 1 54.99 PN Inactive 80 13.7 55.26 5984 5760 2624 1 55.55 DS 100 2688 2 55.83 PN Inactive 90 13.38 56.11 6528 6304 2848 2 56.39 DS 100 2944 2 56.67 PN Inactive 96 13.57 56.96 6976 6784 3072 2 57.23 DS 100 3136 2 57.52 PN Inactive 104 13.44 57.79 5120 4928 3264 2 58.08 DS 100 3328 2 58.36 PN Inactive 110 13.63 58.63 5280 5152 3424 2 58.92 DS 100 3488 2 59.2 PN Inactive 116 13.44 59.48 5472 5408 3584 3 59.76 DS 100 3648 3 60.05 PN Inactive 120 13.38 60.32 5696 5632 3744 3 60.6 DS 100 3808 3 60.89 PN Inactive 126 13.63 61.16 5568 5600 3776 3 61.45 DS 0 3712 3 61.73 Brakes PN Inactive 120 13.82 62 4064 4000 3520 3 62.29 DS 0 3424 4 62.57 Brakes PN Inactive 112 13.95 62.85 3168 3200 3200 4 63.13 DS 0 3104 4 63.42 Brakes PN Inactive 102 14.02 what i think i am seeing is the lambda sensors going into closed loop mode when doing WOT runs, where the ecu relies on pre-programmed settings instead of using the feedback loop. when i lift off at 75.8 seconds. feel free to pass comment Code:
ADVMB 4.2L V8/5V G 0003 G001 G001 G005 G005 TIME Group 1 - Field 2 Group 1 - Field 3 Group 5 - Field 0 Group 5 - Field 2 STAMP O2 Sens Bank1 - +/-10%(>2% flct) O2 Sens Bank2 - +/-10%(>2% flct) Engine Speed - RPM Vehicle Speed - km/h % % /min km/h 48.29 -0.8 0 680 8 49.19 1.6 -2.3 680 5 50.09 3.9 -0.8 640 3 50.99 0.8 -3.1 680 1 51.89 4.7 0.8 680 0 52.79 1.6 -2.3 680 1 53.69 2.3 0.8 1400 5 54.59 -4.7 -5.5 1880 12 55.5 -3.1 -3.9 2080 19 56.39 6.3 7 1360 21 57.29 7.8 8.6 1040 18 59.09 3.1 3.9 680 3 59.99 0 1.6 680 0 60.89 -2.3 -0.8 680 0 61.79 -5.5 -3.9 1120 0 62.69 -6.3 -5.5 760 0 63.59 -8.6 -7.8 680 0 64.49 0 0 1560 0 65.4 0 0 2720 14 66.38 0 0 4240 32 67.5 0 0 5960 49 68.56 0 0 6320 66 69.65 0 0 5520 78 70.77 0 0 6240 89 71.88 0 0 6880 100 72.91 0 0 5080 107 73.94 0 0 5280 114 74.9 0 0 5040 117 75.8 -1.6 -4.7 3000 108 76.7 -5.5 -3.1 2680 96 77.6 0 0 1880 86 78.5 0 0 1840 81 79.41 0 0 1800 79 80.3 0 0 1760 77 81.2 0 0 1680 75 82.1 0 0 1640 73 aaaand finally, another 0-100(ish) but this time logging the throttle pedal sensor, ignition timing and airflow meter (in grammes of air per second). Code:
TIME RPM g/s Throttle Ign.Timing 47.47 1600 70.97 16.9 21.8 48.59 3280 112.5 100 -4.5 49.59 4960 181.14 100 22.5 50.69 6600 238.92 99.6 19.5 51.89 5040 164.22 100 6.8 53.08 5760 209.14 100 27.8 54.18 6440 246.31 100 27.8 55.44 6720 273.36 100 5.3 if i had this level of insight into my racecar, i would be in heaven!
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2001 S8 D2 |
#2
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Great stats look how much ignition it retards at the gear change and closr to the limiter
Dave
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2002 S8 silver with black half leather 2000 d2 S8 in Racing green pearl, RS4 manual gearbox, 2003 A4 avant TDi 1997 Volvo V40 2.0T 1992 Mazda eunos v spec 1976 Reliant Kitten 1965 Porsche 911 |
#3
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flat shift
retarding (or cutting the ignition entirely) reduces the load on the transmission. its something i keep meaning to set up on my race car, but i need to make a clutch switch and i cant be that bothered...
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2001 S8 D2 |
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