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I think I may have possibly found something interesting... comparing 4 back to back logs of when the car ran great, I noticed an area where the a/f ratio humps from 3700 - 4800 rpms, that is the a/f ratio goes from 10.4:1 to 11.1 back to 10.4, during this time period. What is interesting is that continously after these runs, the hump starts to shrink until by the 4th run it becomes just a flat line like the rest of the a/f ratio graph. I think that because of my new boost levels on the small 16g I may have developed a leak at the throttle body initially and with more boosting just made it worse until its in the condition it is in now.
My second reasoning for this is also because the mas Hz increases much much quicker with rpm compared to previous runs as well, which makes sense now that I have a boost leak at the throttle body. I used 1500 Hz just because it was easy to find on the graphs and because peak Hz for each run was different as was max RPM, and these runs were all at the same boost level.
For instance;
Run1: 1500Hz @ 5700 rpm
Run2: 1500Hz @ 5750 rpm
Run3: 1500Hz @ 5350 rpm
Run4: 1500Hz @ 5300 rpm
then when things got bad:
Run5: 1500Hz @ 4450 rpm
Run6: 1500Hz @ 4850 rpm
after new plugs and wires
Run6: 1500Hz @ 4900 rpm
If this theory is incorrect I would appreciate it if someone would correct me. Thanks
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97 awd DD
s16g w/supporting mods
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