Quote:
Originally Posted by PNW-BRZ
Ok, should I be concerned? Best gas around here is 92 Octane. Car is stock (except now has a higher flow air filter). Didn't get a baseline with stock Rom before logging. Started with the 93 OFT and my IAM was roughly around .8 most of the time (usually lower) earlier post has the 93 log. Swapped gas stations/brands and went over to the 91 flash. Now the IAM was bouncing around .45-.70 usually. Only once did I see it briefly hit 1.
91 OFT Pull
http://datazap.me/u/pnw-brz/safeway-92-2
So this was concerning me, so I decided to go back to the stock Rom. Granted I only have about 50 miles on this so it hasn't "learned" completely so I'm not holding high hopes. I'm seeing it bounce between .25 (briefly) to about .65
Tonights "stock rom" run on 92 Octane
http://datazap.me/u/pnw-brz/run-2-st...m?log=0&data=1
Any idea what's going on here? |
As you can see the stock tune is quite "aggressive" timing wise and it knocks quite a lot on anything but good quality 93 AKI fuel or better. This causes the to IAM dropp as ECU pulls timing to protect engine, this results in lost power and smoothness as the ecu is agressive in pulling timing.
guys in south africia have IAM at 0.3 and still getting 3 or 4 degrees of FLKC on stock tune and they dont blow up.
The OFT 91/93 tunes are very similar and the only difference is timing reduction over 6000 rpm.
even the 91 tune will knock a bit on 91/92 in the lower rpm areas 2000-4000, way less than stock tune as you have found but this can drop your IAM to less than 1. Its not going to cause you any significant issue but if you want to clean it up suggest you apply the changes to timing and temperature compensation here they should solve your issue.
Knock Correction for 91 Octane USA fuels
http://www.ft86club.com/forums/showt...47#post2216047
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