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Originally Posted by downpipe12
odd that it went the other way. did you change the mixture at all? i don't know if changing plug gap could affect AFR readings...never heard of that...but thinking about it a little, anything that changes the burn could possibly affect the readings? pure speculation...
either way, more power is always good. i would suspect even more if you do manage to lean it out a bit more...
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You were right
I took it out again today, but with computer hooked up and did 2 full 3rd gear pulls to 100mph and 8000rpm and what I saw the other day just glancing at the mixture meter was a rich spot that showed up after 7400rpm or so to 8000rpm, in the two tests today with 3 turns on the WI and 50/50 with 2% reduced fuel map was 11.0 to 10.8:1 AFR and in the rich zone down to 10.1:1. Moral is you can't trust yourself and must data log all of this stuff.
car is consistently more powerful, showing ~280rwkw (or 370rwhp) on small up hill accent with 1.2kg/cm boost pressure.
I did my final fuel trimming to set the base tuned AFR to 11.0:1 with the W/M activated, from here on in I can simply change the target AFR number and it will automatically adjust the fueling to whatever AFR I want to experiment with.
Ambient air temperature today was 18 deg C during the test and at the end of 3rd gear the AIT was 45deg C, the second test was a long probably 20 degree incline hill and the start AIT was 30 deg C and again at the end of 3rd gear it was 45 to 46 deg C, this is measured after the throttle body and maybe a foot from the inlet port, with high speed sensor. Goes really well for low level of boost (220kpa absolute) and heavy AF mixture.