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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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Thread Tools | Display Modes |
#11
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Despite the fact that 14.64:1 AFR is stoich for gasoline, this is NOT where peak torque is made. Under full load, peak torque occurs around 11.8:1 and peak HP is closer to about 12.6:1. Cruise conditions are quite a bit different and can run upwards of 15.0:1 without technically being "lean", although again this doesn't necessarily equate to the best fuel economy or performance.
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Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
#12
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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 ![]() - Jack |
#13
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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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Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
#14
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That is pretty Fricken sweet.nice job.
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early 99 f250 powerstroke ddp stage 1's, php tuned, 6in 35's,tymer knock off,single stack,adrenaline and 05 f150 Custom tuned by PHP |
#15
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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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#16
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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 |
#17
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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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Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
#18
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Ok, so it's Lean + Load conditions that can cause issues.
thanks for the clarification!
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#19
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![]() Quote:
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Bill Cohron - The Mad Doctor ![]() ![]() ![]() Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
#20
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Bill,
I do not have a Gryphon yet, hopefully soon...that being said, because of the air intake mod I have, do you think it would be detrimental to my engine (stock 5.4 3v with stock air filter) to make WOT runs? Should I cap off the ram air section and just let it breathe through the fenderwell until I get a Gryphon? I haven't made any WOT runs yet, and based upon your explanation of A/F ratios it's probably a good thing I haven't. Thanks for any guidance. |
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Tags |
2009, dyno, f150, power, results, torque |
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