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Author Topic: 140 bkd diesel maf and boost pressure  (Read 4931 times)

Offline four!

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140 bkd diesel maf and boost pressure
« on: January 06, 2012, 04:41:43 pm »
Hi,

Does anyone know standard boost pressure for 140 diesel?

Also is your value for the maf within the limits on vcds when engine is on idle. Mine seems to be out of the range? Wondering if there is a problem with mine.

Cheers

Offline PDT

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Re: 140 bkd diesel maf and boost pressure
« Reply #1 on: January 06, 2012, 04:45:23 pm »
It will be out of range at idle, this is normal. Post a log of boost.

Offline four!

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Re: 140 bkd diesel maf and boost pressure
« Reply #2 on: January 06, 2012, 04:58:23 pm »
I'll see what I can do, not tried that before.

Whats the best method? High gear from low revs with some load on the engine??

Cheers

Offline four!

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Re: 140 bkd diesel maf and boost pressure
« Reply #3 on: January 07, 2012, 04:08:57 pm »
here it is............

Group A:   '010            Group B:   '011         
      Atmosp   Boost P   Accel.       Eng SPD   Boost P   Boost P
TIME   MAF   Pressure   (actual)  (G79)   TIME   (G28)   (specified)   (actual)   Control Duty Cycle
STAMP   mg/str    mbar    mbar    %   STAMP    /min    mbar    mbar    %

0.26   330   1009.8   1040.4   31.4   0.1   1281   1081.2   1030.2   71
0.56   550   1009.8   1050.6   96.1   0.41   1302   1815.6   1030.2   75.4
0.89   625   1009.8   1152.6   100   0.74   1344   1866.6   1101.6   75.4
1.2   715   1009.8   1275   100   1.05   1407   1927.8   1213.8   73.4
1.53   770   1009.8   1428   100   1.38   1449   2009.4   1346.4   75
1.84   890   1009.8   1611.6   100   1.69   1512   2060.4   1509.6   74.6
2.18   1005   1009.8   1836   100   2.02   1617   2162.4   1713.6   75.4
2.48   1175   1009.8   2111.4   100   2.33   1722   2254.2   1958.4   60.8
2.81   1260   1009.8   2386.8   100   2.66   1827   2315.4   2254.2   48.5
3.12   1275   1009.8   2601   100   2.97   1953   2346   2519.4   34.3
3.45   1275   1009.8   2601   100   3.3   2079   2346   2601   14.6
3.76   1040   1009.8   2601   100   3.61   2205   2346   2601   8.7
4.09   1110   1009.8   2335.8   100   3.94   2331   2346   2468.4   46.6
4.4   1190   1009.8   2397   100   4.25   2457   2346   2356.2   34.7
4.73   1225   1009.8   2488.8   100   4.58   2604   2335.8   2437.8   29.2
5.04   1245   1009.8   2539.8   100   4.89   2730   2315.4   2519.4   21.7
5.37   1185   1009.8   2509.2   100   5.22   2856   2295   2539.8   19.7
5.68   1060   1009.8   2366.4   100   5.53   2961   2284.8   2458.2   22.9
6.01   1030   1009.8   2213.4   100   5.86   3087   2264.4   2274.6   27.2
6.32   1015   1009.8   2142   100   6.17   3192   2254.2   2172.6   27.2
6.65   1015   1009.8   2121.6   100   6.5   3297   2233.8   2131.8   27.2
6.96   1005   1009.8   2111.4   100   6.81   3381   2223.6   2121.6   26.4
7.29   1000   1009.8   2111.4   100   7.14   3486   2203.2   2111.4   26
7.6   990   1009.8   2101.2   100   7.45   3591   2182.8   2111.4   25.6
7.93   990   1009.8   2091   100   7.78   3696   2172.6   2091   24.5
8.24   985   1009.8   2070.6   100   8.09   3759   2152.2   2080.8   24.1
8.57   985   1009.8   2060.4   100   8.42   3843   2142   2070.6   23.7
8.88   975   1009.8   2050.2   100   8.73   3927   2131.8   2060.4   23.3
9.21   965   1009.8   2040   100   9.06   4032   2121.6   2050.2   22.5
9.52   965   1009.8   2019.6   100   9.37   4095   2050.2   2029.8   19.7
9.85   935   1009.8   1999.2   100   9.7   4179   1989   2009.4   17.4
10.16   935   1009.8   1978.8   100   10.01   4242   1927.8   1989   14.6
10.49   910   1009.8   1958.4   100   10.34   4326   1897.2   1968.6   13
10.8   890   1009.8   1938   100   10.65   4368   1866.6   1948.2   13.4
11.13   885   1009.8   1907.4   100   10.98   4452   1836   1917.6   15
11.44   870   1009.8   1876.8   100   11.29   4494   1815.6   1897.2   16.6
11.77   850   1009.8   1846.2   100   11.62   4536   1795.2   1866.6   17
12.08   800   1009.8   1785   100   11.93   4578   1734   1815.6   20.1
12.41   770   1009.8   1703.4   100   12.26   4599   1683   1744.2   20.9
12.72   750   1009.8   1652.4   100   12.57   4641   1662.6   1672.8   24.5
13.05   730   1009.8   1611.6   100   12.9   4641   1652.4   1632   27.2
13.35   730   1009.8   1591.2   100   13.21   4662   1632   1601.4   29.2
13.69   730   1009.8   1591.2   100   13.53   4662   1621.8   1581   30.4
14   725   1009.8   1581   100   13.85   4704   1611.6   1591.2   29.6
14.33   725   1009.8   1581   100   14.17   4704   1591.2   1581   30

At 1 point it requests 2.34 bar and gets 2.6.

It seems to be right at the point where the turbo is spooling though. Is this spike acceptable?
Does the requested boost column seem like that of a standard car?

Columns line up nice before I hit the post button then they are all over the place.

Cheers
« Last Edit: January 08, 2012, 08:31:20 am by four! »

Offline four!

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Re: 140 bkd diesel maf and boost pressure
« Reply #4 on: January 08, 2012, 09:10:11 pm »
I have also read that 2601 mb is the max that you can see through vcds on this model ecu. And that it may possibly be going higher. Even though the ecu will see boost up to 3 bar it won't be displayed??

Cheers

Offline PDT

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Re: 140 bkd diesel maf and boost pressure
« Reply #5 on: January 11, 2012, 07:06:04 pm »
Remember that the boost readings include the atmospheric pressure on the day (1009mb)