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Old 05-05-2012, 07:31 PM   #151
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Originally Posted by stang74shelby View Post
So is the AEM the best CAI out there? or is one preferred over the other like some people seem to favor Chevy over Ford
I think it is... But what he was saying is AEMs Wideband o2 is a very important tuning piece.
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Old 05-05-2012, 09:26 PM   #152
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A UEGO (wideband) sensor doesn't work properly at WOT? Is that what you are saying?

Also, are you saying that the standard mode 1 PID data for fuel system status is invalid on the 2012 Focus?
No I dont think thats what I said at all , I am saying that the front o2 sensor is not used at WOT to set or trim the OL fueling , the front o2 in no way can change the air fuel once WOT fueling is used or seen

Mode 1 PID only means "show currect data" so so everyone can understand what your talking about lets just say your datalogging and lets use OL=open loop or CL=closed loop , people will read this and there is no sense making this harder then it has to be for those that dont know

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Old 05-05-2012, 09:31 PM   #153
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The primary O2 sensor (in the 2012 Focus) works fine at WOT. There is absolutely no reason why it shouldn't.
Never said it didnt work find , it just doesnt datalog or show what the ACTUAL A/F of the engine is at WOT where you can datalog it with out adding a wide band air fuel gauge like the AEM or LC-1 standalone air fuel gauge , may change this statement at some point , I have seen this on the 2011 Mustang but not on the Focus yet

Like I said I havent played with the 2012 a lot yet but for what I have seen the WOT fuel it is logging matches what the Base Fuel commanded fuel is (have these actual tune files to look at) NOT the actual A/F the engine is seeing out the Exh , 2000-2011 also work this way , Now saying that on the 2011+ Mustangs it does actually show the the A/F Mode 1 PID $34 (o2s1_wr_lambda) , I sent a email to a SCT Engineer to confirm if the Focus in 2012 does the same , he also can not confirm this is the case like on the Mustangs YET, so I will change to it may be posible

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Old 05-05-2012, 09:43 PM   #154
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If this is anything like the 2011+ Mustang PCM codes, the car will not actually go to open loop at WOT. They have a factory wideband sensor, so the car stays in closed loop and fuel trims will adjust even at WOT.

There is "OP mode" aka Optimum Performance, but it's still technically closed loop. You can set the throttle position for OP mode.

The 2012 Focus could be the same way. I might be able to get a PCM code or two opened up in SCT.
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Old 05-05-2012, 09:45 PM   #155
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Originally Posted by 1turbofocus View Post
Like I said I havent played with the 2012 a lot yet but for what I have seen the WOT fuel it is logging matches what the Base Fuel commanded fuel is (have these actual tune files to look at) NOT the actual A/F the engine is seeing out the Exh , 2000-2011 also work this way

Tom
This is usually the case, but then you'd see a flatter line. The log posted a few pages back is pretty rocky and doesn't look like it was just a data plot extrapolated from the "base fuel table". I'm wondering if these cars have wideband front o2 sensors and a "desired lambda at WOT" table like most other 2011+ Fords. If that's the case, the stoich is probably 14.079, too.
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Old 05-05-2012, 09:53 PM   #156
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Originally Posted by stang74shelby View Post
So is the AEM the best CAI out there? or is one preferred over the other like some people seem to favor Chevy over Ford
I asked him about a wideband sensor not about a CAI, he still says dont modify until tuning options come out. I want to be able to monitor mine, because i will have a lot of air going into the airbox.
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Old 05-05-2012, 11:40 PM   #157
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Quote:
Originally Posted by Kabigon View Post
The primary O2 sensor (in the 2012 Focus) works fine at WOT. There is absolutely no reason why it shouldn't.

I am not sure what strategy Ford is using with the wideband on the Focus, but I have seen a lot of dynos on exhaust and intake upgrades on 2011+ 5.0 Coyote Mustangs, and without any tuning, the Copperhead ECU in the Mustang is correcting its A/F with these mods consistent with the stock A/F throughout the rev range (a pretty darned perfect A/F for good power). Many shops attribute this to the use of the wideband o2 sensor.

Many newer stand alone fuel injection systems like FAST can run closed loop all the time (part throttle and WOT) with the use of a wideband sensor.
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Old 05-06-2012, 02:01 AM   #158
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Slightly off topic...

So, Tom, would you recommend no Mods at all til tuning is able to be performed or would a cat-back be okay with current knowledge??? Is the intake the more risky mod for now?

Thanks,
Casey
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Old 05-06-2012, 02:08 AM   #159
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Originally Posted by Sonic_HedgeHog View Post
Slightly off topic...

So, Tom, would you recommend no Mods at all til tuning is able to be performed or would a cat-back be okay with current knowledge??? Is the intake the more risky mod for now?

Thanks,
Casey
I wouldn't be throwing up a red flag, but I would definatly proceed with caution until a tune comes along. I'm not Tom but I just graduated with a degree in applied science in automotive tech. I wouldn't be worried unless your planning on running your car really hard all day in hot weather. Keep it on the streets and not the track until tunes come out and all should be ok.
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Old 05-06-2012, 02:17 AM   #160
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I wouldn't be worried unless your planning on running your car really hard all day in hot weather. Keep it on the streets and not the track until tunes come out and all should be ok.
I know Tom is a bit of an engine expert, but my engineer friend told me this last night as well . . . (I am paranoid though now, lol)
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