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Reload this Page 2009 F-150 5.4L Preliminary Dyno Results!
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2009 to 2014 F-150
3.5L, 3.7L, 4.6L, 5.0L, 5.4L, and 6.2L equipped F-150s.

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  #1  
Old Fri, January 23rd, 2009, 10:45 PM
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Thanks, Bill - makes perfect sense to me. And, I can see how your A/F curves smoothly adopt that strategy, rather than having the sharp "bump" at 4500 rpm.

But, now I've started "thinking" again (which I know is dangerous). The stock curve seems to hold the A/F ratio near 14.08 (the ideal for E10). And, I have to imagine the older trucks like my 2005 and earlier tried to hold it at 14.64 (for REAL gas ), so did Ford put out a flash to the PCM to "adapt" them to E10 when it sort of became the "standard"? As I recall from the f150 forums, the 2004-2005s were already lean running when they came out. E10 would just make things worse, right?

- Jack
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Old Sat, January 24th, 2009, 01:00 AM
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To some degree. Keep in mind that the vehicle tested was a FlexFuel vehicle and had the ethanol sensor. Also, don't forget that those are WOT runs. The fuel strategies are a little bit different at WOT than at cruise where 15+ AFR is not uncommon.
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Old Wed, January 28th, 2009, 11:23 AM
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Originally Posted by Power Hungry View Post
at cruise where 15+ AFR is not uncommon.
Really? I thought this was a recipe for disaster. I always heard how leaning a motor out could wreck any number of parts, most notably the pistons. is there any truth to this? is it only under certain conditions?
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Old Wed, January 28th, 2009, 11:44 AM
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At cruise, there's very little load on the engine. I imagine that's how you get away with a lean A/F setting.

- Jack
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Old Wed, January 28th, 2009, 01:55 PM
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At cruise, there's very little load on the engine. I imagine that's how you get away with a lean A/F setting.

- Jack
Exactly. Running a tad lean (lean being a relative term here) during light cruise (minimum load) is not uncommon for most auto manufacturers. In fact, I've seen as high as 15.8:1 under light cruise. Under acceleration or load, fuel curves will richen up as necessary to keep things safe.
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Old Wed, January 28th, 2009, 06:35 PM
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Ok, so it's Lean + Load conditions that can cause issues.
thanks for the clarification!
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Old Wed, January 28th, 2009, 07:12 PM
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Ok, so it's Lean + Load conditions that can cause issues.
thanks for the clarification!
Couldn't have said it better myself!
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Windows™ 11 is garbage!

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