thanks to Nick we have found the problem with the low reading MAF and as two very clever people have said, its because of the MAF housing. We are still confused as to how it managed to run good figures on that housing before but who cares now 
as far as the ID goes, Nicks housing (a Bosch unit) is the same as the end i still have off my old MAF. i dont know why but our housings are 80mm OD and 72.2mm ID where the sensor sits. if anyone knows more about this i would appreciate their input.... its all a bit strange!
So today Nick kindly let me swap parts from car to car and we ran logs on both cars in all combinations (my maf sensor in Nicks housing etc etc), we found that the problem transfered onto Nicks car and my car pulled good figures with Nicks housing on... the log is below
Still on T7 B7 and NOT running wmi
all i need to do now is to make a sleeve for my MAF housing (i really want to keep it) but i dont know how thick....as i cant put material back on i am going to start thick (2mm wall), then run a log and if the values are too high, bore some more out.. i suppose the only thing that will happen if they are slightly high is it will want to run richer.
Well done and thanks to Dave and John
, if we hadnt got mixed up in this 72.2mm ID business this would have been closed a while ago. at least we are there now.
once i have the Sleeve made to the right thickness i will start again on the WMI and timing malarky..
as far as the ID goes, Nicks housing (a Bosch unit) is the same as the end i still have off my old MAF. i dont know why but our housings are 80mm OD and 72.2mm ID where the sensor sits. if anyone knows more about this i would appreciate their input.... its all a bit strange!
So today Nick kindly let me swap parts from car to car and we ran logs on both cars in all combinations (my maf sensor in Nicks housing etc etc), we found that the problem transfered onto Nicks car and my car pulled good figures with Nicks housing on... the log is below
Still on T7 B7 and NOT running wmi
Code:
Sunday 15 March 2009 10:18:21
1ML 906 032 A 1.8l R4/5VT 01 0001
Group A: '003 Group B: '020
RPM Mass Flow Load Ign. Timing Idle Stabilization Idle Stabilization Idle Stabilization Idle Stabilization
TIME TIME
MARKER STAMP /min g/s % °BTDC STAMP CF CF CF CF
17.51 2520 20.14 12.5 36 17.09 0 0 0 0
18.31 2560 20.42 12.9 34.5 17.89 0 0 0 0
19.13 2600 19.06 12.2 36 18.71 0 0 0 0
19.93 2600 19.25 12.5 36 19.51 0 0 0 0
20.73 2720 60.22 79.6 26.3 20.31 0 0 0 0
21.53 3080 115.31 100 12.8 21.13 0 0 0 0
22.34 3600 137.97 100 9 21.94 0 0 0 0
23.14 4160 169.97 100 10.5 22.74 0 0 0 0
23.94 4680 185.75 100 9.8 23.54 0 0 0 0
24.76 5200 201.06 100 9.8 24.34 0 0 0 0
25.56 5600 209.56 100 11.3 25.16 0 0 0 0
26.36 6040 215.31 100 12 25.96 0 0 0 0
27.16 6400 216.69 99.6 13.5 26.76 0 0 0 0
27.97 6720 219.11 100 16.5 27.57 0 0 0 0
28.77 5360 142.33 81.6 26.3 28.39 0 0 0 0all i need to do now is to make a sleeve for my MAF housing (i really want to keep it) but i dont know how thick....as i cant put material back on i am going to start thick (2mm wall), then run a log and if the values are too high, bore some more out.. i suppose the only thing that will happen if they are slightly high is it will want to run richer.
Well done and thanks to Dave and John
, if we hadnt got mixed up in this 72.2mm ID business this would have been closed a while ago. at least we are there now.once i have the Sleeve made to the right thickness i will start again on the WMI and timing malarky..
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