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Old 05-11-2017, 06:24 PM   #31
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The 02 bungs on the FS header should never of been placed where they engineered it , you want the o2 even the stock one to get a reading from all Cly

You would need to install your wide band AF Gauge past your flange in the pipe and have a bung welded in for it , you want to see a reading from all 4 Cyl not 2

You want the bung to be less the 1/2 inch TOTAL thickness 3/8 is ideal

What should the gauge read
Idle and cruise you will see anything from 13`s to 16`s depending on if you on or off the throttle you really dont need to worry about the AF ration at idle or part throttle/cruise

Its WOT you need to see and why your installing a wide band air fuel gauge , On the MK3 I have found that .84-.85 12.3-12.5 works best , in my opinions its the safest and best performance

On the earlier Zetec and Duratec I would shoot for 12.8 AF , the MK3 seems to like the added fuel at WOT

Tom
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Old 05-11-2017, 06:41 PM   #32
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Originally Posted by 1turbofocus View Post
The 02 bungs on the FS header should never of been placed where they engineered it , you want the o2 even the stock one to get a reading from all Cly

You would need to install your wide band AF Gauge past your flange in the pipe and have a bung welded in for it , you want to see a reading from all 4 Cyl not 2

You want the bung to be less the 1/2 inch TOTAL thickness 3/8 is ideal

What should the gauge read
Idle and cruise you will see anything from 13`s to 16`s depending on if you on or off the throttle you really dont need to worry about the AF ration at idle or part throttle/cruise

Its WOT you need to see and why your installing a wide band air fuel gauge , On the MK3 I have found that .84-.85 12.3-12.5 works best , in my opinions its the safest and best performance

On the earlier Zetec and Duratec I would shoot for 12.8 AF , the MK3 seems to like the added fuel at WOT

Tom
Thanks for the info Tom. So for those of us with the xcal4, we can use that to monitor the AF ration correct? just get a mount for it?
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Old 05-11-2017, 06:55 PM   #33
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Thanks for the info Tom. So for those of us with the xcal4, we can use that to monitor the AF ration correct? just get a mount for it?
xcal4 or any decent OBD-II sniffer, I've got a BlueTooth one that I connect to my phone to pull up gauges. I've used the AF since installing the TTR to make sure I'm in an okay region.
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Old 05-11-2017, 07:08 PM   #34
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what app do you use one your phone? What obd2 Bluetooth device did you get? i like that idea.
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Old 05-12-2017, 10:36 AM   #35
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what app do you use one your phone? What obd2 Bluetooth device did you get? i like that idea.
I've got the OBDLink Mx from OBDLink, OBDLink® - OBD-II Diagnostic Scan Tools for Android, iOS, & Windows | OBDLink® | OBD Solutions

The reason I went with them is their one of the few quality units out there that isn't a cheap Chinese piece. They also allow you to read/write which means I can clear codes and program through FoCCCus with the unit as well.

I use their stock app on an Android phone, the Mx doesn't work with iPhones (bummer since that's what I have as my main right now) but I had an old phone sitting around.

You can access so many gauges it'll make your head spin! And with cheap 7" tablets being what they are, you could easily add a nice heads up display that you can just leave in the car.
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Old 05-12-2017, 11:57 AM   #36
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Thank you for the info. For now, I just bought a cheap little vent mount for the xcal4. Once I get it I'll start monitoring the AF ratio.

Side note, what is a acceptable air intake temp? I want to see how how much of a warm air intake my short ram intake actually is.

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Old 05-12-2017, 12:05 PM   #37
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Thank you for the info. For now, I just bought a cheap little vent mount for the xcal4. Once I get it I'll start monitoring the AF ratio.

Side note, what is a acceptable air intake temp? I want to see how how much of a warm air intake my short ram intake actually is.

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Ideally, intake air temp should equal ambient air temp. For most of the other cars I've driven with stock air boxes, IAT tends to be about 15 degrees over ambient since they're pulling some engine bay air as well as fresh air.

I'd say you want to be no more than 20 degrees over ambient as a worst case, but this needs to be evaluated while moving, as everything heat soaks if you're standing still. Things like the Velossa Tech Big Mouth intake are worth it because they help kill that 15-degree rise over ambient.

Coolder air = Denser air, and Denser air = More power!
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Old 05-12-2017, 12:55 PM   #38
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So if it's 60 degrees outside I should see between 60-80 degree intake Temps?

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Old 05-16-2017, 01:04 PM   #39
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Got a vent mount for my xcal4 so now I can use the gauges. Just have to figure out what to do about the cord.i can't close the access door to the obd2 when the cord is plugged in and the cord itself hangs in the way.

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Old 05-16-2017, 01:32 PM   #40
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Got a vent mount for my xcal4 so now I can use the gauges. Just have to figure out what to do about the cord.i can't close the access door to the obd2 when the cord is plugged in and the cord itself hangs in the way.

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I'm working on that same issue now. I've got my bluetooth adapter but I can't close the door with it installed. Working on a new piece of plastic that will slot in where the OBD-II is now to re-align the connector up since there's plenty of space in the dash for the connector to live.
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