Do I need to adjust my AFR?
03-06-2007, 07:18 PM
#1
Do I need to adjust my AFR?
So I started to datalog my O2's and have found something very interesting. I start out in the high 13's and then go down to mid 13's. Over 5800-6000 I dip into high 12's. Now I am new at this but wouldn't these numbers be what I would be looking to tune to already. Am I just lucky or am I missing something. This is right around where I was going to tune the car but it seems to already be running there.
Any thoughts/help?
Any thoughts/help?
03-06-2007, 07:35 PM
#2
The fact that you go richer at the top end is normal. Your ECU does that along with closing up the TB by about 15-20% IIRC (there was a thread on this over a year ago).
However, how in the world is it that you are running that a/f with no tuning? Relative to stock average a/f I'd say you're runing lean. Just so happens it lands you where your a/f SHOULD be once tuned, lol. Is this bad? well either you have extra air coming into the motor (vaccum leak) or you have a clog in your fuel system (the filter at the pump clogged or injectors are dirty).
I agree the a/f is perfect, but you have done no tuning to it, thus, there's something wrong. I'd look into it. It wont break anything, as you have perfect a/f, BUT whatever is causing it might get worse, and you might then run into problems
Just my 2 cents meng
However, how in the world is it that you are running that a/f with no tuning? Relative to stock average a/f I'd say you're runing lean. Just so happens it lands you where your a/f SHOULD be once tuned, lol. Is this bad? well either you have extra air coming into the motor (vaccum leak) or you have a clog in your fuel system (the filter at the pump clogged or injectors are dirty).
I agree the a/f is perfect, but you have done no tuning to it, thus, there's something wrong. I'd look into it. It wont break anything, as you have perfect a/f, BUT whatever is causing it might get worse, and you might then run into problems
Just my 2 cents meng
03-06-2007, 07:41 PM
#3
I thought it was "perfect" so to speak. As for something being wrong, it's a brand new car that's only seen BP Ultimate. I can't see anything being wrong with it, never had any MIL's.
03-07-2007, 06:02 AM
#6
Originally Posted by Nietzsche
I start out in the high 13's and then go down to mid 13's. Over 5800-6000 I dip into high 12's
http://forums.maxima.org/showpost.ph...48&postcount=4
Originally Posted by 95BLKMAX
The fact that you go richer at the top end is normal. Your ECU does that along with closing up the TB by about 15-20% IIRC (there was a thread on this over a year ago).
Originally Posted by 95BLKMAX
However, how in the world is it that you are running that a/f with no tuning? Relative to stock average a/f I'd say you're runing lean. Just so happens it lands you where your a/f SHOULD be once tuned, lol. Is this bad? well either you have extra air coming into the motor (vaccum leak) or you have a clog in your fuel system (the filter at the pump clogged or injectors are dirty).
Originally Posted by 95BLKMAX
I agree the a/f is perfect, but you have done no tuning to it, thus, there's something wrong. I'd look into it. It wont break anything, as you have perfect a/f, BUT whatever is causing it might get worse, and you might then run into problems
03-07-2007, 02:58 PM
#7
That post on the TB not closing was a 5.5 gen. The 6th gens may be different. I was going to do some testing on my own to figure that out. I'm also looking to do some 0-60 and 1/4 mile timing soon. We'll see how I run. All in all I'm thinking that I don't need to waste the money on a AFR controller and a tune. More testing is needed but if that's how it runs then great!
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