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Help me understand logs

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
Hi,
Can you help me understand logs in vcds
I have done a run of logs 2nd gear upto redline
Logs of air mass 002, fuel trims 032, boost pressure 115

To check for boost leaks maf etc.
Car is 2004 ibiza cupra 1.8T 180bhp

If anyone can have a look and see if they think it's good or bad.
Also how do I post the .csv file?
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
02, Engine Speed, Mass, Specified Boost, Actual Boost


,109.52,760,16.5,980.0,970.0
,110.43,800,17.3,980.0,970.0
,111.34,960,49.6,980.0,970.0
,112.24,1600,63.2,1070.0,990.0
,113.15,2360,28.6,980.0,1190.0
,114.05,1480,22.6,980.0,990.0
,114.96,1880,86.5,1450.0,1070.0
,115.86,2480,115.0,1630.0,1400.0
,116.77,3240,151.1,1610.0,1860.0
,117.68,3560,12.8,980.0,1150.0
,118.58,2680,93.2,980.0,1170.0
,119.48,2640,12.8,980.0,1010.0
,120.39,2560,12.8,980.0,990.0
,121.30,2440,12.8,980.0,980.0
,122.20,2320,12.8,980.0,980.0
,123.10,2280,36.1,980.0,960.0
,124.01,2400,71.4,1080.0,1160.0
,124.91,2600,92.5,1440.0,1290.0
,125.82,2920,144.4,1640.0,1770.0
,126.72,3080,12.8,980.0,1150.0
,127.63,2840,12.8,980.0,1010.0
,128.53,2560,13.5,980.0,990.0
,129.44,2440,14.3,980.0,980.0
,130.34,2360,18.0,980.0,970.0
,131.25,2240,13.5,980.0,970.0
,132.15,2160,12.8,980.0,970.0
,133.06,2080,39.1,980.0,960.0
,161.11,1400,13.5,980.0,980.0
,162.02,1040,15.8,980.0,970.0
,162.93,2160,12.8,980.0,970.0
,163.84,2160,36.1,980.0,970.0
,164.74,2520,85.0,1470.0,1060.0
,165.65,3240,145.9,1620.0,1750.0
,166.55,3200,12.8,980.0,1120.0
,167.46,2760,92.5,1640.0,1100.0
,168.36,2960,19.5,980.0,1300.0
,169.27,2880,12.8,980.0,1010.0
,170.17,2600,12.8,980.0,990.0
,171.08,2480,12.8,980.0,990.0
,171.98,2200,12.8,980.0,990.0
,172.89,2080,12.8,980.0,990.0
,173.79,1920,13.5,980.0,980.0
,174.70,1880,12.8,980.0,980.0
,175.60,1800,13.5,980.0,980.0
,248.02,1040,14.3,980.0,980.0
,248.93,1360,15.0,980.0,970.0
,249.83,1720,80.5,1540.0,980.0
,250.73,2280,106.8,1660.0,1300.0
,251.64,3120,149.6,1630.0,1860.0
,252.54,3960,136.8,1610.0,1620.0
,253.46,4840,122.6,1600.0,1430.0
,254.35,4680,12.0,980.0,1160.0
,255.27,3880,140.6,1610.0,1760.0
,256.17,4080,12.0,980.0,1150.0
,257.07,3200,127.8,1600.0,1530.0
,257.97,3240,12.0,980.0,1140.0
,258.88,2960,12.0,980.0,1010.0
,259.78,2560,12.8,980.0,1000.0
,260.69,2480,12.8,980.0,990.0
,261.60,2360,13.5,980.0,990.0
,262.50,2160,12.8,980.0,990.0
,263.40,2000,13.5,980.0,990.0
,264.31,1880,13.5,980.0,990.0
,265.22,1840,12.8,980.0,990.0
,266.12,1680,12.0,980.0,980.0
,267.03,1160,13.5,980.0,980.0
,267.93,1880,13.5,980.0,980.0
,268.84,1840,13.5,980.0,980.0
,269.74,1760,19.5,980.0,970.0
,270.65,1560,12.8,980.0,980.0
,271.55,1600,77.4,1180.0,1010.0
,272.46,1840,93.2,1350.0,1160.0
,273.36,2000,15.8,990.0,1110.0
,274.27,2040,15.8,990.0,1000.0
,275.17,2000,12.8,990.0,990.0
,276.08,1960,12.8,990.0,980.0
,276.98,1960,18.0,990.0,980.0
,277.89,1960,25.6,990.0,980.0
,278.80,2040,39.8,990.0,980.0
,279.70,2160,60.2,990.0,1110.0
,280.60,2400,107.5,1680.0,1320.0
,281.51,2800,147.4,1650.0,1810.0
,282.42,3240,131.6,1600.0,1550.0
,283.33,3480,17.3,990.0,1250.0
,284.23,2760,113.5,1640.0,1370.0
,285.13,2960,141.4,1640.0,1830.0
,286.03,3000,12.8,990.0,1090.0
,286.94,2880,12.8,990.0,1010.0
,287.84,2800,13.5,990.0,1000.0
,288.75,2680,13.5,990.0,990.0
,289.66,2600,13.5,990.0,990.0
,290.56,2480,13.5,990.0,990.0
,291.47,2400,12.8,990.0,990.0
,292.37,2240,12.8,990.0,990.0
,293.28,2000,13.5,990.0,990.0
,294.19,1680,13.5,990.0,990.0
,295.09,1120,14.3,990.0,980.0
,295.99,880,15.0,990.0,970.0
,296.90,1920,12.8,990.0,970.0
,297.81,1880,45.9,990.0,960.0
,298.71,2200,72.2,990.0,1150.0
,299.61,2360,21.8,990.0,1040.0
,300.52,2280,13.5,990.0,1000.0
,301.43,2160,13.5,990.0,990.0
,302.33,2040,13.5,990.0,990.0
,303.52,1880,14.3,990.0,990.0
,304.44,1760,13.5,990.0,990.0
,305.35,1760,21.8,990.0,980.0
,306.25,1920,63.2,990.0,1000.0
,307.16,1480,14.3,990.0,990.0
,308.06,960,20.3,990.0,980.0
,308.97,840,16.5,990.0,980.0
,309.86,760,16.5,990.0,970.0
,310.78,720,18.0,990.0,970.0
,311.68,720,21.1,990.0,970.0
,312.59,1120,39.1,990.0,970.0
,313.49,1440,36.8,990.0,980.0
,314.40,2080,79.7,1280.0,1010.0
,315.30,2680,14.3,990.0,1150.0
,316.21,2080,93.2,1660.0,1130.0
,317.11,2720,130.8,1670.0,1610.0
,318.02,3560,124.8,1590.0,1530.0
,318.93,4440,138.3,1580.0,1660.0
,319.83,5240,140.6,1600.0,1740.0
,320.74,5120,12.0,990.0,1200.0
,321.64,4160,124.8,1580.0,1580.0
,322.55,4560,130.8,1580.0,1590.0
,323.46,4520,12.0,990.0,1200.0
,324.36,3440,12.0,990.0,1020.0
,325.26,3040,12.0,990.0,1000.0
,326.16,2720,12.8,990.0,1000.0
,327.07,2680,12.8,990.0,1000.0
,327.97,2600,13.5,990.0,1000.0
,328.88,2560,12.8,990.0,990.0
,329.78,2560,12.8,990.0,990.0
,330.69,2600,98.5,1610.0,1190.0
,331.60,2840,143.6,1640.0,1790.0
,332.50,2960,27.1,990.0,1290.0
,333.41,2880,12.8,990.0,1020.0
,334.31,3040,133.8,1620.0,1630.0
,335.22,3040,12.0,990.0,1060.0
,336.12,3000,12.8,990.0,1000.0
,337.03,2840,13.5,990.0,1000.0
,337.93,1800,13.5,990.0,1000.0
,338.84,2440,11.3,990.0,990.0
,339.74,2680,14.3,990.0,990.0
,340.65,2600,45.1,990.0,980.0
,341.55,2840,103.8,1480.0,1280.0
,342.46,3200,130.1,1600.0,1610.0
,343.36,3240,12.0,990.0,1070.0
,344.27,3120,12.8,990.0,1010.0
,345.17,3200,94.0,1370.0,1180.0
,346.08,3480,140.6,1590.0,1720.0
,346.99,3920,140.6,1600.0,1750.0
,347.90,4280,134.6,1590.0,1600.0
,348.80,3800,15.8,990.0,1090.0
,349.70,3480,140.6,1580.0,1710.0
,350.60,3640,140.6,1050.0,1710.0
,351.51,2840,83.5,1510.0,1010.0
,352.41,2880,143.6,990.0,1780.0
,353.32,2760,12.8,990.0,1040.0
,354.22,2200,13.5,990.0,1000.0
,355.13,1520,12.8,990.0,990.0
,356.04,2560,78.2,1230.0,1020.0
,356.94,2640,124.1,1500.0,1560.0
,357.85,2800,127.1,1590.0,1610.0
,358.75,2920,125.6,1280.0,1560.0
,359.66,2840,12.8,990.0,1050.0
,360.56,2760,16.5,990.0,1000.0
,361.47,2640,27.1,990.0,1000.0
,362.37,2600,41.4,990.0,1000.0
,363.28,2560,43.6,990.0,1050.0
,364.18,2520,54.1,990.0,1080.0
,365.09,2520,53.4,990.0,1130.0
,365.99,2520,31.6,990.0,1130.0
,366.90,2400,13.5,990.0,1010.0
,367.81,2280,13.5,990.0,1000.0
,368.71,2160,13.5,990.0,990.0
,369.61,2040,21.8,990.0,980.0
,370.52,2040,46.6,990.0,1000.0
,371.43,2000,49.6,990.0,1040.0
,372.33,2000,16.5,990.0,1020.0
,373.23,1880,12.8,990.0,990.0
,374.14,1760,12.8,990.0,990.0
,375.05,1640,12.8,990.0,980.0
,375.95,1160,14.3,980.0,980.0
,376.85,920,14.3,980.0,970.0
,377.76,720,18.8,980.0,970.0
,378.66,760,23.3,980.0,970.0
,379.57,760,20.3,980.0,970.0
,380.46,720,22.6,980.0,970.0
,381.38,720,21.1,980.0,970.0
,382.29,1080,41.4,980.0,970.0
,383.19,1120,51.1,980.0,990.0
,384.10,1600,45.9,980.0,1030.0
,385.00,1800,29.3,980.0,1000.0
,385.91,1840,22.6,980.0,990.0
,420.00,880,15.8,990.0,980.0
,444.85,2720,112.0,1610.0,1350.0
,445.75,3000,144.4,1640.0,1840.0
,446.66,3240,140.6,1610.0,1740.0
,447.56,3000,12.8,980.0,1060.0
,448.47,2600,83.5,1580.0,980.0
,449.37,2600,12.8,980.0,1050.0
,450.28,2440,12.8,980.0,1010.0
,451.18,2360,12.8,980.0,1000.0
,452.09,2320,12.8,980.0,1000.0
,452.99,2200,12.8,980.0,1000.0
,453.90,2080,12.8,980.0,990.0
,454.80,1920,13.5,980.0,990.0
,455.71,1880,13.5,980.0,990.0
,456.61,1800,13.5,980.0,990.0
,457.52,1160,15.0,980.0,980.0
,458.42,2120,13.5,980.0,980.0
,459.33,2080,13.5,980.0,990.0
,460.23,1960,13.5,980.0,990.0
,461.14,1720,13.5,980.0,990.0
,462.04,1120,15.0,980.0,980.0
,462.95,2240,13.5,990.0,980.0
,463.85,2280,60.2,990.0,1060.0
,464.76,2400,44.4,990.0,1070.0
,465.66,2480,42.1,990.0,1050.0
,466.57,2480,21.8,990.0,1020.0
,467.48,2400,20.3,990.0,990.0
,468.38,2320,36.1,990.0,1000.0
,469.28,2360,41.4,990.0,1020.0
,470.19,2400,41.4,990.0,1030.0
,471.10,2480,94.0,1500.0,1120.0
,472.00,2640,25.6,990.0,1230.0
,472.90,2600,12.8,990.0,1010.0
,473.81,2520,51.9,990.0,990.0
,474.72,2600,19.5,990.0,1220.0
,475.62,2520,12.8,990.0,1010.0
,476.53,2400,12.8,990.0,1000.0
,477.43,2360,63.2,990.0,1040.0
,478.34,2480,81.2,1400.0,1240.0
,479.24,2800,131.6,1660.0,1640.0
,480.15,3160,131.6,1620.0,1630.0
,481.06,3240,13.5,990.0,1190.0
,481.96,2480,12.8,990.0,1010.0
,482.86,2400,12.8,990.0,1000.0
,483.77,2480,105.3,1610.0,1290.0
,484.67,2640,141.4,1660.0,1770.0
,485.58,2840,123.3,1610.0,1540.0
,486.48,2880,12.0,990.0,1080.0
,487.39,2720,12.8,990.0,1010.0
,488.29,2520,13.5,990.0,1000.0
,489.20,2360,13.5,990.0,1000.0
,490.10,2000,13.5,990.0,990.0
,510.02,1760,36.1,990.0,980.0
,510.92,1920,53.4,990.0,1000.0
,511.83,2280,78.9,1640.0,1190.0
,512.73,3000,140.6,1640.0,1750.0
,513.64,3840,124.1,1600.0,1460.0
,514.54,3400,12.8,990.0,1100.0
,515.45,3120,127.8,1630.0,1550.0
,516.35,2760,12.8,990.0,1090.0
,517.26,2440,12.8,990.0,1010.0
,518.16,2480,84.2,1350.0,1100.0
,519.07,2480,12.8,990.0,1020.0
,519.97,2440,12.8,990.0,1000.0
,520.88,2360,13.5,990.0,1000.0
,521.78,2400,75.2,1300.0,1000.0
,522.69,2560,124.1,1670.0,1530.0
,523.59,2760,79.7,1370.0,1510.0
,524.50,2720,12.8,990.0,1040.0
,525.41,2520,13.5,990.0,1000.0
,526.30,1920,13.5,990.0,1000.0
,527.22,2000,10.5,990.0,990.0
,528.12,2440,15.0,990.0,990.0
,529.03,2360,13.5,990.0,990.0
,529.93,2360,48.1,990.0,990.0
,530.84,2480,72.2,990.0,1250.0
,531.74,2400,12.8,990.0,1030.0
,532.65,2280,13.5,990.0,1000.0
,533.55,2040,13.5,990.0,990.0
,534.46,1880,13.5,990.0,990.0
,535.36,1120,15.8,990.0,980.0
,536.27,920,15.8,990.0,980.0
,537.18,1640,24.8,990.0,970.0
,538.08,2080,95.5,1590.0,1150.0
,538.98,2720,134.6,1660.0,1650.0
,539.89,3520,123.3,1590.0,1490.0
,540.80,4240,130.1,1590.0,1580.0
,541.71,5040,139.8,1620.0,1700.0
,542.61,4560,12.0,990.0,1130.0
,543.51,3840,126.3,1580.0,1530.0
,544.43,4160,124.8,990.0,1480.0
,545.32,3160,12.8,990.0,1040.0
,546.22,2960,12.8,990.0,1000.0
,547.13,2760,12.8,990.0,1000.0
,548.04,2720,12.8,990.0,1000.0
,548.93,2560,13.5,990.0,1000.0
,549.85,2480,13.5,990.0,1000.0
,550.75,2400,12.8,990.0,990.0
,551.66,2320,12.8,990.0,990.0
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
From what I can see in the Specified Boost, Actual Boost:

It takes until the next row of figures to build the Actual boost, and then matches the specified boost, maintains boost, sometimes exceeds slightly.

Does that sound right, or could that be a boost leak after turbo if a slight delay (1 row) to build the actual boost? or is that just lag?
 

Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
5,229
2,658
It's been a while since I've looked at logs... but... I believe you need to include throttle % as well. I could be wrong but I think if eg specified boost is 1000... but throttle % is eg 40% (mine only goes to 85% WOT) then actual would be 500 and that would be fine because you weren't requesting all of it.
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
Hi,
Thanks for that, does this make sense it includes engine load, is that throttle % ?

Group C: 115

TIME, Engine Speed RPM, Engine Load %, Specified Boost mbar, Actual Boost mbar, Air mass in g/s

248.93 1360 15 980 970 4.78
249.83 1720 80.5 1540 980 35.08
250.73 2280 106.8 1660 1300 65.31
251.64 3120 149.6 1630 1860 84.31
252.54 3960 136.8 1610 1620 119.81
253.46 4840 122.6 1600 1430 141.81
254.35 4680 12 980 1160 78
255.27 3880 140.6 1610 1760 95.56


315.3 2680 14.3 990 1150 11.56
316.21 2080 93.2 1660 1130 49.78
317.11 2720 130.8 1670 1610 89.08
318.02 3560 124.8 1590 1530 105.14
318.93 4440 138.3 1580 1660 107.44
319.83 5240 140.6 1600 1740 140.83
320.74 5120 12 990 1200 36.39
321.64 4160 124.8 1580 1580 120.31
322.55 4560 130.8 1580 1590 106.44
323.46 4520 12 990 1200 5.39



537.18 1640 24.8 990 970 25.75
538.08 2080 95.5 1590 1150 52.78
538.98 2720 134.6 1660 1650 90.47
539.89 3520 123.3 1590 1490 107.44
540.8 4240 130.1 1590 1580 108.47
541.71 5040 139.8 1620 1700 134.83
542.61 4560 12 990 1130 70.47
543.51 3840 126.3 1580 1530 111.33
544.43 4160 124.8 990 1480 3.06
545.32 3160 12.8 990 1040 6.42


673.86 1960 13.5 980 980 5.42
674.76 2000 69.9 1450 960 41.17
675.67 2520 113.5 1680 1400 78.92
676.57 3400 145.1 1600 1790 75.56
677.49 4280 144.4 1600 1680 115.92
678.39 5080 135.3 1610 1600 149.28
679.3 5480 24.8 980 1510 4.56
680.19 4040 101.5 1570 1190 116.19
681.1 4440 133.8 1580 1570 110.08
682.01 4480 20.3 980 1490 4.53
 

Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
5,229
2,658
Looks fairly similar to when I logged mine and follows the same pattern. Requests more boost, gets more boost. Maintains boost. Then boost falls off gradually.
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
Thanks that is good to know it is similar to yours, put my mind at ease about a boost leak.

I had a block 032 run o2 fuel trim of -7.8% swapped maf, as I had a spare Bosch one, now -0.8% seems more responsive now.

I hope it was that rather than boost leak
 

Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
5,229
2,658
Thanks that is good to know it is similar to yours, put my mind at ease about a boost leak.

I had a block 032 run o2 fuel trim of -7.8% swapped maf, as I had a spare Bosch one, now -0.8% seems more responsive now.

I hope it was that rather than boost leak
Sounds like it. Anything up to around 3% is normal fuel trim. I had +0.8% funnily. That's until I fitted the Revo cone filter.
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
Had another look at fuel trims today and now with the new MAF I have:
block 032 run o2 fuel trim of negative -9.4% even worse than the negative -7.8% of old MAF
so perhaps still a problem um... any ideas?
 

ibiza1.8t-cupra

Active Member
Jan 27, 2020
41
14
I have charted Specified boost and Actual Boost in a graph, against time in sec, from what I can see that looks good, not leaking boost, holds boost, waves a little??? if anyone can take a look at that chart, opinions would be great ? stock 1.8t 180bhp. I'm getting a Max boost of 890mbar -12.9psi
Specified Boost Blue, Actual Boost Red
boost-chart.jpg
 
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