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Old 07-27-2012, 03:46 PM   #41
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The only afr I can recall was on Focusboy's dyno I believe, though there may have been another.
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Old 07-27-2012, 03:46 PM   #42
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How about donating some dyno and data collection time to someone close to you with a 2012+ Focus? Then you would have no doubts about the data collected and could then help those who ask for guidance.
Tom said a few months ago that he has dynoed some 2012s and the A/F ratio was lean, I forget which thread it was but I asked specifically, and is the reason I am not doing my exhaust until tuning is available.
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Old 07-27-2012, 03:53 PM   #43
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I think that thread was Focusboys. If I remember correctly, his AFR at WOT was 13.1.
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Old 07-27-2012, 03:56 PM   #44
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I think that thread was Focusboys. If I remember correctly, his AFR at WOT was 13.1.
yeah that was it.
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Old 07-27-2012, 09:04 PM   #45
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Target AF should be 12.8 / 12.9 , 13.2 is the MAX 13.1 is pushing it

ALL the 2012 I have dynoed have been borderline lean to lean , even a couple stock Foci and knocking

Unless you know what the air fuel is and spark knock I would use extreem caution modding the 2012 Focus

Tom
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Old 07-28-2012, 03:33 PM   #46
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Target AF should be 12.8 / 12.9 , 13.2 is the MAX 13.1 is pushing it

ALL the 2012 I have dynoed have been borderline lean to lean , even a couple stock Foci and knocking

Unless you know what the air fuel is and spark knock I would use extreem caution modding the 2012 Focus

Tom
I know you mean well, but kind of an absurd thing to say so a bunch of amateur modders don't you think? I know of what you speak, I know not how to check/measure it. And I can't imagine many do.

Also, I'd love to assume companies like FSWerks at least have some level of due diligence in this regard, and wouldn't be selling a destructive product.
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Old 07-28-2012, 05:24 PM   #47
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Its easy a wide band air fuel gauge for the air fuel , SCT is working on the tuning for the 2012 that will also come with a way to check for spark knock

You would think that companys would check to see if there product is running lean wouldnt you , or if they cause any spark knock and some do but there not going to tell you , there selling a part not a part with tuning / datalog service , its your responsibility to chack air fuel and spark knock not the compamy selling intakes , headers , cams , SC , Turbos etc

Thats why I am here now warning I have seen lean 2012 Foci

Tom
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Old 07-28-2012, 05:29 PM   #48
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Well that's good to know anyways. I'll definitely be looking into it. Barely had mine for 4 months and I rather be safe.
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Old 07-28-2012, 05:59 PM   #49
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Thanks for the heads up Tom. Im definitely going to wait for tunning capability first before I start modding my SEL. This is my first brand new car and im sure as heck not gonna "F" it up because of me being impatient. All good things come with time....
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Old 07-28-2012, 10:33 PM   #50
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I have a couple questions...I would assume the air/fuel on a carburetor would need to be adjusted, with a fuel injected engine would the computer not make the necessary adjustments? What would the tale tale signs of too lean be, pinging?
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