A/F change due to outside temp?
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A/F change due to outside temp?
So I got to thinking that I just got a tune a month ago in the "cool" weather, it wasn't really cold this day. I live in New York. A/F was right near or a tad below 12.0. I know as it gets warmer its going to drop a little more, but my question is how much?
Is there any definite factor relating degrees to drop in afr?
Is there any definite factor relating degrees to drop in afr?
So I got to thinking that I just got a tune a month ago in the "cool" weather, it wasn't really cold this day. I live in New York. A/F was right near or a tad below 12.0. I know as it gets warmer its going to drop a little more, but my question is how much?
Is there any definite factor relating degrees to drop in afr?
Is there any definite factor relating degrees to drop in afr?
Last edited by achilles3000; Feb 10, 2011 at 08:05 PM.
I notice my afr's were lean, but when I logged I noticed 1-2 pounds increase in boost. I was in higher load cells.
Yeah it would get leaner if the car was tune for 28 psi an now its hitting 30 psi..As long as it doesn't go past 12.2 your fine.
Ahh that makes more sense, I had the car put on the dyno at DG Motors in long island beacause I was getting transfercase work done by Dogbox Racing.
Base run of my evo8 on the dyno dynamics put down 270hp/270tq and a/f was lean at 12.5 across the board. After tuning the car was richened up and got a more solid tune and put down 295hp/300tq
And please DO NOT turn this into a DG bashing, all that drama was well over a year ago and I believe he does good work. Will be picking the car up probably Wednesday with my new t-case in and I'll hopefully be posting a video of a data logging run etc when I have it back.
Also, I believe a/f was set to aroundddd 11.8
The day the car was tuned I believe it was around 45-50* outside, the inside temp might have been a bit warmer.
Base run of my evo8 on the dyno dynamics put down 270hp/270tq and a/f was lean at 12.5 across the board. After tuning the car was richened up and got a more solid tune and put down 295hp/300tq
And please DO NOT turn this into a DG bashing, all that drama was well over a year ago and I believe he does good work. Will be picking the car up probably Wednesday with my new t-case in and I'll hopefully be posting a video of a data logging run etc when I have it back.
Also, I believe a/f was set to aroundddd 11.8
The day the car was tuned I believe it was around 45-50* outside, the inside temp might have been a bit warmer.
If d.g did such a good job on the tune why would it be lean already? ?And how come you didn't contact pete first??And do not compare ivey to d.g. theres no contest as far as a.rushed tune I don't believe that pete must have told you.this.good luck
Last edited by MR Turco; Feb 11, 2011 at 06:36 AM.
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Okay first of all the car was lean when I bought it, after Ivey tuned it. Second of all he did not tell me this. Third of all I'll be posting graphs and data logging of the work this upcoming week. And fourth all I was looking for was a constant change standard (example .1/20*F) or something to that effect
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Im in upstate NY and on 3rd gear pulls WOT im at around 10.7-10.8 in below around 15-20 degree temps. So if cold air causes the afr to lean out then i wonder what my afr will be in the summer heat. Just installed my wideband about a month ago so i guess i will have to wait and see.
Im in upstate NY and on 3rd gear pulls WOT im at around 10.7-10.8 in below around 15-20 degree temps. So if cold air causes the afr to lean out then i wonder what my afr will be in the summer heat. Just installed my wideband about a month ago so i guess i will have to wait and see.
Afrs are not gonna change a whole lot as long as you keep the boost where the car was tuned on. The weather is going to affect your boost more then anything and that will affect the afr. My car is always at the same afr no matter the temp as long as the boost is where it needs to be
Your car is running very rich.
Afrs are not gonna change a whole lot as long as you keep the boost where the car was tuned on. The weather is going to affect your boost more then anything and that will affect the afr. My car is always at the same afr no matter the temp as long as the boost is where it needs to be
Afrs are not gonna change a whole lot as long as you keep the boost where the car was tuned on. The weather is going to affect your boost more then anything and that will affect the afr. My car is always at the same afr no matter the temp as long as the boost is where it needs to be
Last edited by escodotcarter; Feb 11, 2011 at 10:06 AM.
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Your definitely safe with that a/f but I'm sure you'd pull some extra power out of the car if it was in the 11.5 area. 11.5 a/f is still considered safe.
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