I have the AEM UEGO in a boosted gsr. My AFR's are at like 15 at idle and at like 3% throttle. It even goes to like 16-17 when I decelarate. I know decelaration is supposed to be lean but is it that lean. When I press the throttle more then like 5% it goes to like 13-11's then at like 3500K it dissappears to the the rich region. This is a basemap, and no I am not beating on the car with the basemap. Just wondering what is a safe AFR when cruising and at idle, so I can drive to the tuner. I have a VAFC and can adjust at idle etc... I know not to adjust too much so the timing is not affected.

Thanks for the info.

 

This is funny because there was just another post about this.

1. 15:1 AFRs at idle are fine.
2. When you decelerate your injectors turn off! Meaning no fuel.
3. You have a basemap, if the car runs fine just go and get it tuned and have no worries at al.

 

Figured just needed an answer. The only issue is at light throttle should it be at 15afr. My VAFC says I am at like 3-5 % throttle cruising and the afr's are at like 15 is That normal?
Thanks again

 

If the car doesn't buck or miss then yes the 15:1 AFR is fine. I used to run my car at 16:1 at cruise to get really good mileage. The only time you really need to be concerned with AFRs is full throttle.

 

Why do you think that's lean? Do people really think AFRs should be 12:1 ALL the time?

Why not call the tuner who made the basemap? It sounds like a pretty decent basemap.

 

i agree..that map looks fine..it should get u there no problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nonvtecD &raquo;</TD></TR><TR><TD CLASS="quote">If the car doesn't buck or miss then yes the 15:1 AFR is fine. I used to run my car at 16:1 at cruise to get really good mileage. The only time you really need to be concerned with AFRs is full throttle.</TD></TR></TABLE>

 

Sounds normal to me as well.

I remember the first time I looked at my AF logs when I bought my wideband. There were a lot of things I didn't understand, like why my AF ratio cycled around 14.7 at idle, and why the AF ratio cycled even while I was driving. (I was running closed loop at the time).

But yeah, it's interesting seeing for the first time what your car ECU is doing to fuel your engine.

What's interesting to me is seeing AF datalogs from stock turbo vehicles. A lot of time the AF ratio is all over the map, even while they are in boost. And I tuned and tuned and tuned until my AF ratio was flat because I was paranoid. lol

 

I am so sorry to thread jack but since we're already on this topic....I have the AEM UEGO also and my car was tuned with the AEM EMS. I noticed that my a/f ration at idle is always at 11.0-11.5. Now I know this is rich and it should be like 14-15 at idle.
Am I causing any harm to my engine? My tuner said it would be fine but I guess I wanna get a second opinion. The gas mileage sucks btw and I daily drive my car Thanks and again I don't mean and I'm sorry to thread jack.

 

TriniRacer. What size fuel injectors do you have? Gas mileage really depends on your driving. I know people who hit 2lbs - 5lbs off every traffic light and stop sign

 

I'm using 650cc injectors. I'm not too concerned about the gas mileage. I jus wann be sure that its safe to have my afr at 11.0-11.5 at idle all the time.

 

Maybe something is wrong with your wideband? I know it's new. Things happen though. Cars like different A:F and timing at idle but low to mid 11's is too rich if that's really the A:F at idle. Not a huge deal considering it's idle but if you say it doesnt leave the 11's or 12's cruising there is a problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TriniRacer &raquo;</TD></TR><TR><TD CLASS="quote">I am so sorry to thread jack but since we're already on this topic....I have the AEM UEGO also and my car was tuned with the AEM EMS. I noticed that my a/f ration at idle is always at 11.0-11.5. Now I know this is rich and it should be like 14-15 at idle.
Am I causing any harm to my engine? My tuner said it would be fine but I guess I wanna get a second opinion. The gas mileage sucks btw and I daily drive my car Thanks and again I don't mean and I'm sorry to thread jack. </TD></TR></TABLE>

If your tuner wants you to run 11-12:1 AFRs at idle he is wrong. Get it tuned by someone else.

 

Oh no, when cruising it's fine and works normal. Its jus that it at low to mid 11's at idle ALL the time. I jus wanna be sure that this is not causing any major damage to my engine that I should be worried about. Thanks for ur input.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TriniRacer &raquo;</TD></TR><TR><TD CLASS="quote">I am so sorry to thread jack but since we're already on this topic....I have the AEM UEGO also and my car was tuned with the AEM EMS. I noticed that my a/f ration at idle is always at 11.0-11.5. Now I know this is rich and it should be like 14-15 at idle.
Am I causing any harm to my engine? My tuner said it would be fine but I guess I wanna get a second opinion. The gas mileage sucks btw and I daily drive my car Thanks and again I don't mean and I'm sorry to thread jack. </TD></TR></TABLE>

Running that rich can damage your motor. The extra fuel will rinse the oil of your cylinder walls causing premature wear of the piston rings and score the cylinder walls. I'd find someone else to tune the car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nonvtecD &raquo;</TD></TR><TR><TD CLASS="quote">If your tuner wants you to run 11-12:1 AFRs at idle he is wrong. Get it tuned by someone else.</TD></TR></TABLE>

He didn't say that he "wants" me to run at 11-12:1 its jus that after he tuned it I noticed like it was like this; and in my friend's turbo civic his is always at like 14-15 and in other turbo cars its like 14-15 also. I figured something must have been wrong with my car. Hope its not hurting my motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nonvtecD &raquo;</TD></TR><TR><TD CLASS="quote">If your tuner wants you to run 11-12:1 AFRs at idle he is wrong. Get it tuned by someone else.</TD></TR></TABLE>

He didn't say that he "wants" me to run 11-12:1 AFRs at idle....its just that after my car was tuned I noticed that at idle my afrs was always at 11.0-11.5 and in my friend's turbo civic and other turbo cars the at idle the afr is at 14-15. I hope that I'm not causing any damage to my motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">Why do you think that's lean? Do people really think AFRs should be 12:1 ALL the time?

Why not call the tuner who made the basemap? It sounds like a pretty decent basemap.</TD></TR></TABLE>

I am sorry if I implied that the map was wrong I was just concerned about the cruising AFR's, also the AFR's at idle would occasionally go up in the 15's so I wanted to ensure this was normal. I know the injectors shut off in decel, and that the car runs lean at idle just did not know it was that lean. I have read alot of articles on pgmfi, and the knew the basics.

As to the tuner, he is trust worthy as he did a friends car, and the basemap was pretty good aswell as the tune after. I will be getting it tuned as it goes pig rich (like the meter does not even show a number) when ever I press the throttle beyond 75% or above 3500rpm. The car bogs noticeably from 4k-5k, but I believe this is due to fuel as it is way rich during this period. I do not take it out so I can only go by the 2 times I took it out to check for oil leaks.

I just wanted to learn a bit about the AFR's. Thanks for the information.