Air-Fuel ratio under WOT - Mustang Evolution

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Old 06-07-2014, 11:28 AM   #1
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Air-Fuel ratio under WOT

Hey guys, got a tuned 2014 V6 here. I loaded a new 87 performance tune just yesterday, and I'm some issues with it at WOT'

1. The A/F ratio goes all the way down to 10.6-10.8 (from 13.9-14.1) under WOT, and soon as I release the gas paddle - it goes to 20 and comes back to 14.0 when I resume cruising.

basically this is the cycle (cruising - WOT - cruising): 14.1 -- 12.8 -- 10.6 -- 20 (release of paddle) -- 14.1

2. It doesn't have smooth acceleration at WOT amymore. Meaning it jerks a lot (more like suffocation) under WOT - more like when you're out of gas, you're tryna get to nearest gas station and you car starts jerking because of no fuel.

I know its a faulty tune (same issues twice) - I'm gonna do a data log this time and send it back for revision. Just curious whats your A/F ratio like at WOT, so that I have baseline data for future comparisons?

Thanks!
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Old 06-07-2014, 11:57 AM   #2
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Mine drops to around 11.8 - 12.1 under acceleration. Normal driving is around 13.8 - 15. On closed throttle it typically goes to 20 (injectors shut off) then occasionally down to 14-15.

My car is completely stock btw.
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Old 06-07-2014, 12:00 PM   #3
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Mine drops to around 11.8 - 12.1 under acceleration. Normal driving is around 13.8 - 15. On closed throttle it typically goes to 20 (injectors shut off) then occasionally down to 14-15.

My car is completely stock btw.
Hmm interesting, so I guess mine at 10.6ish isn't quite 'normal' and it should stay around 12 +/- under wot?

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Old 06-07-2014, 01:09 PM   #4
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I have never saw mine get into the 10's.

If the tune was created for a CAI and exhaust it could be that. It's really hard to say. It does seem like your car is running a bit rich.
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Old 06-07-2014, 01:14 PM   #5
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It was for an air raid cai and axlebacks, so let's see what the data log says

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Old 06-07-2014, 03:21 PM   #6
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I was told by a local reputable dyno tuner the air fuel ratio at WOT should be set 12 parts to 1.

Sent from my little Johnson.
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Old 06-07-2014, 07:12 PM   #7
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I was told by a local reputable dyno tuner the air fuel ratio at WOT should be set 12 parts to 1.

Sent from my little Johnson.
Yeah that's what I've heard, it shouldn't go lower than 12-11.8 under wot. I'm gonna try loading up a different tune and see what the readings are.

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Old 06-07-2014, 08:20 PM   #8
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Noobie question lol.. How do you check this? I have a tuner as well
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Old 06-07-2014, 08:36 PM   #9
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Noobie question lol.. How do you check this? I have a tuner as well
Do you have 13-14 with digital gauges? It has a wide band a/f built in there.

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Old 06-07-2014, 08:37 PM   #10
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Noobie question lol.. How do you check this? I have a tuner as well
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Old 06-07-2014, 08:38 PM   #11
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Do you have 13-14 with digital gauges? It has a wide band a/f built in there.

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Sorry mobile double post.. But yes I have a 2014 V6 Premium.. To be honest I'm not to familiar with any of this.. Does anyone have a link to maybe explain this to me?
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Old 06-07-2014, 08:48 PM   #12
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Sorry mobile double post.. But yes I have a 2014 V6 Premium.. To be honest I'm not to familiar with any of this.. Does anyone have a link to maybe explain this to me?
Hmm okay go to the first gauge up top where it displays xxx miles to empty. Press right cursor/menu option selector on left hand side of your steering wheel. You will see a list of different gauges over there (a/f ratio, cylinder head temperature, voltage etc)

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Old 06-08-2014, 10:08 AM   #13
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I think that's the track pack version.. Don't believe I have that. Is there any other way to check out that information?
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Old 06-08-2014, 10:34 AM   #14
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If you have a premium, you have it. It's the LCD between the speedometer and tachometer. If you hit the left button on the steering wheel two or three times, it will take you to the main screen. Select the top option, then hit the right button and it will give you a readout of all kinds of information, with A/F being one of the top.

It's a premium option and has nothing to do with the track pack.
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Old 06-08-2014, 11:28 AM   #15
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I think I got ripped off then.. Lol cause my V6 is a premium and dosnt have it.. Click image for larger version

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I can only manage through options on the little LCD under the rpm gage.. Is there any other way to find this information?
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Old 06-08-2014, 12:40 PM   #16
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I think I got ripped off then.. Lol cause my V6 is a premium and dosnt have it.. Attachment 158825

I can only manage through options on the little LCD under the rpm gage.. Is there any other way to find this information?

Yup dug through my paper work and in fine print v6 mustang coupe not premium even tho the car salesman said it was.. Well lesson learned as a first time buyer.. Never believe a salesman
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Old 06-08-2014, 02:23 PM   #17
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Noobie question lol.. How do you check this? I have a tuner as well
No worries bro. Just call up your tuning company and ask them what command value did they set for your WOT. Its that easy. Bama already set mine 12:1 wot

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Old 06-08-2014, 02:32 PM   #18
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No worries bro. Just call up your tuning company and ask them what command value did they set for your WOT. Its that easy. Bama already set mine 12:1 wot

Sent from my little Johnson.

Thank you bud I'll call bama I appreciate everyone's help as well. You guys rock
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Old 06-08-2014, 04:27 PM   #19
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How do you guys monitor this? I'm tuning my economy tune and need to know such readings. What's stock? What's tuned? Where is the sweet spot?
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Old 06-08-2014, 04:28 PM   #20
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So for is 2011 guys, I need a gauge?
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Old 06-08-2014, 05:21 PM   #21
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How do you guys monitor this? I'm tuning my economy tune and need to know such readings. What's stock? What's tuned? Where is the sweet spot?
Stock is usually around 13.9-14.1 i.e, when you're cruising/driving normally. I'm sure someone else would chime in about sweet spot, they say it should be around 12 under WOT.

Ebay has tons of a/f ratio gauges, get the digital one for more accurate readings. Or get an OBD II module and torque app for your cell phone. It shall display all such parameters.




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So for is 2011 guys, I need a gauge?


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Old 06-09-2014, 12:17 AM   #22
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Interesting read. I have the guage but never really paid attention to it.
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Old 06-09-2014, 12:38 AM   #23
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I did a few WOT pulls this evening, interestingly my a/f ratio consistently stayed between 11.4-11.6

Same tune gave me 10.6 just yesterday, BUT that was like 20 mins after I loaded it on my car. Could it be that the ECU readjusted the parameters due to its relearning thing?

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Old 06-10-2014, 11:50 AM   #24
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Quote:
Originally Posted by bazinga11 View Post
Stock is usually around 13.9-14.1 i.e, when you're cruising/driving normally. I'm sure someone else would chime in about sweet spot, they say it should be around 12 under WOT.

Ebay has tons of a/f ratio gauges, get the digital one for more accurate readings. Or get an OBD II module and torque app for your cell phone. It shall display all such parameters.








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Ok so let's say 14 is normal ratio. That's 14 air to 1 part air? I believe my ast training told me 14:1 is considered ideal. But as I'm reading, we run rich at wot and idle. So I need to adjust my timing for those to to be around 13.5-14? Correct me if I'm wrong, don at bama just gave me all the settings and told me to play with it.
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Old 06-11-2014, 06:35 AM   #25
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So for is 2011 guys, I need a gauge?

Aeroforce gauge
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Old 06-11-2014, 08:07 AM   #26
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Datalog.....datalog......datalog.


Running too rich is also bad for the motor as well as running too lean.
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Old 06-11-2014, 08:59 AM   #27
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Datalog.....datalog......datalog.


Running too rich is also bad for the motor as well as running too lean.

I need to learn how to do the data logs.. Think ima try to figure it out this weekend.. I just wanna make sure I'm running good
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Old 06-11-2014, 09:27 AM   #28
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I need to learn how to do the data logs.. Think ima try to figure it out this weekend.. I just wanna make sure I'm running good

What tuner do you have? Should have a setting to let you data log on it.
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Old 06-11-2014, 09:39 AM   #29
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Sct 4 bama tuner.. I do have the option to data log but I see people have laptops connected to save the data log n the whole 9 I just haven't tried it
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Old 06-11-2014, 02:07 PM   #30
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I am curious and searched the forum, does altitude affect the optimum Air/Fuel Ratio? I am in Colorado and the average altitude that I drive at is about 5300 feet above sea level.
During normal driving my Air/Fuel (measured by track apps) is about 14.2 and 14.0 at idle. At WOT it flickers at 12.1-12.2. It seems that I am right about average as others that have posted in this thread.
I am wondering if there is a better Air/Fuel ratio if you drive in thinner air?
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