Hi

Hope someone can help, I have slowly been building up my xdf for my ecu 8E0909518P. My first couple of attempts at increasing boost are not giving me the expected results. My first attempt I basically increaed the entire KFMIRL table by 25% which put my max requested load at about 290+- I then increased LDRXN by the same scale ie 25% so the load values were about the same this increased my requested boost only slightly from 800mbar too around 1bar but I had part throttle surging and cold starts were very very lumpy and you could hear the turbo spooling. So my next attempt I only scaled the KFMIRL up from about the 30 load mark upwards again by 10% and did the same for LDRXN the same this has improved the cold start and part throttle surging but I am not not boosting above 1bar.

following is my KFMIRL map

0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00
11.70   11.16   10.95   10.73   10.43   10.27   10.10   10.01   10.01   10.01   9.82   9.56   9.23   8.93   8.81   8.55
23.37   22.34   21.94   21.28   20.63   20.60   20.06   20.37   20.04   20.02   19.27   18.89   18.19   17.91   17.58   16.97
40.03   36.75   35.41   34.34   33.49   33.07   32.32   32.27   32.11   31.99   31.15   30.73   30.21   30.21   29.49   29.46
52.92   48.40   46.20   44.91   44.02   43.57   42.75   42.24   42.14   41.98   41.23   40.88   40.78   40.99   40.06   40.41
66.31   60.10   56.79   55.22   54.24   54.19   53.56   52.36   52.13   51.89   51.66   51.33   51.35   50.86   50.30   50.39
79.55   71.98   67.83   65.70   64.57   64.34   63.59   62.77   62.37   61.97   61.90   61.50   61.41   60.56   60.24   60.07
92.98   83.98   78.12   76.13   74.84   74.37   73.50   73.17   72.70   72.14   72.07   71.44   71.18   70.15   69.89   69.38
107.02   96.47   87.99   86.46   84.89   84.33   83.56   82.90   82.64   82.01   81.92   81.21   80.70   79.83   79.34   79.13
134.75   123.05   110.86   107.11   105.73   105.17   104.30   102.73   102.26   102.10   102.12   101.58   100.85   99.68   99.05   99.66
159.33   146.75   133.41   129.24   128.09   127.41   126.38   124.22   123.28   123.26   123.05   122.56   122.16   121.48   121.10   122.49
178.39   165.89   154.95   154.10   151.01   148.48   147.52   145.92   145.15   144.57   144.35   144.40   144.40   144.19   145.43   145.32
187.25   175.83   166.32   164.72   162.80   158.91   157.48   155.18   154.48   154.41   154.83   155.98   156.66   156.07   156.66   156.33
196.20   186.19   176.46   174.36   172.69   169.36   168.52   165.94   164.18   163.74   166.18   166.32   166.48   167.86   168.96   167.65
202.64   194.14   186.21   184.81   183.38   179.25   179.21   175.79   174.71   174.19   175.64   177.38   178.55   180.75   180.12   180.17
219.12   216.40   212.82   212.72   213.05   210.10   207.97   206.77   202.36   204.45   204.29   207.59   207.38   210.80   211.95   211.97


and this is LDRXN

181.50   220.04   241.93   233.72   233.25   234.38   236.26   235.88   232.13   232.13   228.75   226.13   226.13   223.88   221.25   218.25


My k04 hybrid has a 50mm K04 compressor wheel and a k03 turbine wheel and I am pretty sure it can boost more than what I am doing currently. I would like too have about 1.2bar boost if any one has some pointers that would be great.

if it wasnt up to the job then the actual boost wouldnt meet requested but my requested boost never goes above 2000mbar, so my understanding is that the n75 is opening the WG and keeping actual boost at the requested boost level. I thought that boost is 10*(spec load)+300mbar so with my KFMIRL table having a max load level of 219 10*219+300mbar=2490mbar which I am not seeing in my requested boost. Also on my previous tuner map and my old k03 I was seeing requested/actual boost above 2bar

logs from a run I did now

Sunday   18   December   2011   12:45:05                                 
8E0 909 518 P      1.8L R4/5VT         0001                                       
                                             
   Group A:   002            Group B:   031            Group C:   115         
      RPM   Load   Inj. On Time   Mass Flow      Lambda Factor   Lambda Factor              RPM   Load   Absolute Pres.   Absolute Pres.
   TIME               TIME               TIME            
Marker   STAMP    /min   %    ms    g/s   STAMP               STAMP    /min   %    mbar    mbar


   285.04   1720   39.1   3.06   12.83   285.27   0.984   1           285.51   1760   37.6   980   1000
   285.74   1800   37.6   3.06   13   285.98   0.984   1           286.22   1840   38.3   980   1000
   286.44   1840   39.8   3.4   14.78   286.69   0.969   1           286.92   1880   39.8   1030   1000
   287.15   1920   76.7   7.82   32.25   287.39   0.766   0.953           287.61   2040   88.7   1960   1150
   287.85   2080   94   9.86   40.81   288.09   0.727   0.922           288.31   2200   104.5   1940   1350
   288.56   2280   110.5   9.18   51.44   288.79   0.906   0.914           289.02   2400   127.1   1950   1590
   289.26   2480   140.6   12.58   74.64   289.5   0.891   0.906           289.72   2680   171.4   1960   2030
   289.96   2800   181.2   16.66   98.75   290.2   0.914   0.899           290.43   2960   182   1970   2190
   290.67   3120   175.2   16.32   100.36   290.91   0.899   0.899           291.13   3280   168.4   1970   2060
   291.37   3360   167.7   15.64   108.92   291.59   0.906   0.899           291.83   3560   162.4   1960   2040
   292.07   3640   160.2   14.96   111.25   292.3   0.899   0.899           292.54   3800   160.2   1960   1990
   292.78   3880   160.9   15.3   118.89   293   0.875   0.867           293.24   4040   160.2   1950   1970
   293.47   4160   159.4   15.64   126.17   293.7   0.836   0.836           293.94   4280   158.6   1960   1940
   294.17   4400   160.2   16.32   134.72   294.41   0.821   0.821           294.65   4560   160.9   1960   1920
   294.87   4640   162.4   17.34   142.61   295.11   0.797   0.805           295.35   4800   163.2   1960   1930
   295.58   4880   162.4   17   150.44   295.82   0.782   0.789           296.06   5040   164.7   1960   1920
   296.3   5120   163.2   18.36   162.03   296.52   0.743   0.782           296.76   5280   162.4   1930   1900
   297   5360   162.4   19.04   167.53   297.22   0.735   0.766           297.46   5520   159.4   1880   1860
   297.71   5600   159.4   19.38   170.72   297.93   0.735   0.75           298.17   5720   158.6   1840   1840
   298.41   5800   156.4   19.38   174   298.67   0.735   0.735           298.9   5960   151.9   1810   1790
   299.15   6040   150.4   19.04   173.72   299.38   0.735   0.727           299.61   6160   148.1   1760   1780
   299.85   6200   145.1   18.7   171.56   300.07   0.735   0.711           300.31   6320   143.6   1710   1770
   300.55   6360   140.6   18.36   173.25   300.78   0.735   0.704           301.02   6480   135.3   1700   1740
   301.26   6560   135.3   18.36   166.83   301.48   0.735   0.696           301.72   6680   133.1   1660   1690

Thanks for the feedback, yes I have not modified KFLDHBN could you tell me what the relation is too boost?

KFLDHBN set the max alowed boost presure ratio vs RPM and ambiante temperatur or intake temperatur selcted by CWRLMX

I looked a little harder at KFLDHBN and I think I understand whats its doing.... I am running a dual side mount IC setup on my car and IAT's never go above 50degrees. I multiplied the whole KFLDHBN table by 10% and lowered my LDRXN slightly. Car is running really strong now logs attached I havent touched fueling or timing yet but while logging I was getting a fuel trim rich multi DTC not sure why fueling would go over the 25% adaption limit if I havent touched anything fueling related? Thanks for the help.

This.

Standard K03-52 here, hits 1.3bar and tails down to 0.9 (using catless pipe).

Keep in mind that you need to request enough load in KFMIRL but by the looks
of things you can intitially keep it as is.

Secondly, FF the entire KFLDHBN to disable this limiter totally. The reason you want
to do this is that need to avoid interferance whilst calibrating LDRXN.
I would strongly suggest that you keep LDRXN at a maximum of 190 intially in the midrange
and decrease it towards 150-160 at high revs during evaluation. If you need a complete
LDRXN curve to start from, I'd be happy to suggest one.

Also, there is another limiter that might be necessary to adjust and that is for maximum
allowed flow through the air mass meter. You will see a fault code for this when you push
the boost pressure but this limiter is of course adjustable as well if you need it.

Finally, there is an ME7 function for boost deviation handling thart might need to
be disabled during boost calibration. If you get a code called 17963 your actual boost
deviates too much from your requested boost. To prevent this from happening, FF the entire
KFDLULS function during boost calibration to get your boost control in order, then recalibrate
the KFDLULS properly. Having more than 0.2 bars of deviation indicates that you need to work
som more on your regulation.
If you have difficulties reaching the higher boost levels requested, it's not uncommon that you
need to increase KFLDIMX for higher boost pressure levels. This has been the case for me on
quite a few cars.

During calibration I always use analog knock detection, readings of oil temperature, air after
compressor temperature, air after intercooler temperature, exhaust gas temperature and back pressure
levels to give me an indication that I'm within sane operating conditions and I suggest that you do
the same when cranking the boost severely.