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b00stAdict

10+ Year Contributor
101
2
Jan 22, 2009
broomfield, Colorado
So just got my pocket logger and did a log. First let me say my car is somewhat stock, EVO3 16g, MBC set at 10psi, Ported 2g ex manifold, ported o2 housing, 3" exhaust all the way back no cat, 3" Greddy muffler and a boost gauge nothing outrageous just exhaust work. I have my log in an attachment i hope you all can view it its in a excel format. Check it out and let me know what you think.. I've done some research and and from what i've come across my fuel trims should pretty much be around 100% all the time and my FTRM and FTRH look good but my FTRL seems way off. Also my timing seems to be all over the place from 16* to 43* and im not sure about my o2 readings like i said im pretty new to tuning so if someone could explain what the readings mean that would be appreciated. I know a good reading is between .83-.90 or in that range.


Thanks again in advance for any help/advice :thumb:

anyone?!?!?! any suggestions?? any thoughts?? any comments?? come on people i know someone's gotta know something... moderators? :banghead:
 

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Here is how the o2 reading works.

"Sensor output ranges from 0.2 volts (lean) to 0.8 volts (rich). A perfectly balanced or "stoichiometric" fuel mixture of 14.7 parts of air to 1 part of fuel gives an average reading of around 0.45 volts". Under boost you want it rich.
 
Your trims are decent. The low is a little lean, Did you hack the maf? Otherwise the mid and high are fine. The FT02 will always change, But it is a running average of what the trim for the rpm/throttle position you are in will do.
Example: The FT02 may fluctuate between 95% and 106% while you are at partial throttle at 4000 rpm and your high trim will end up being at 100%.
If you did not hack the maf then your 02 might be slow or dying.
You can also change Your settings on the logger to read Farenheit.
 
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