A/F Ratio Guage Questions - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus First Generation > ZETEC Performance (2000-2004)

ZETEC Performance (2000-2004) The place to chat about any 2.0L Zetec engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 11-19-2012, 09:48 PM   #1
Andrews-bad-SE
Focus Enthusiast
 
Join Date: Jun 2012
Fan#: 100389
Location: O'fallon, MO
What I Drive: 2003 Arizona Beige SE 4dr Zetec/ATX

Posts: 182
FF Reputation: 3 Andrews-bad-SE Good Standing Member
Buy-Sell-Trade Rating: (2)
A/F Ratio Guage Questions

I have a Zetec, with no tune...

I have a CAI, and flex-back exhaust from Option Racing...

I got an instrument cluster from a friend's zx3, which has the tach and everything...

But, there are two things that I want to monitor. A/F mix and voltage.

I'm going to put in a dual gauge pillar pod.

My concern is the A/F gauge. How do I wire it? I've heard it splices into the black signal wire of my upstream o2 sensor. Will the extra "drag" on the signal current on the wire to the gauge have any adverse effects on the A/F signal going to the computer? Just wondering before I do anything.

I want to avoid a tune to stay smog legal, I'm trying to "go legit." lol...

Any help or insight is greatly appreciated! Rock on, guys and gals.




Andrews-bad-SE is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-19-2012, 10:08 PM   #2
Magus2727
Focus Fanatic
 
Magus2727's Avatar
 
Join Date: Feb 2009
Fan#: 62897
Location: Salt Lake City, UT
What I Drive: 2001 Malibu Blue ZX3

Posts: 4,347
Points 8,123, Level 60
Points: 8,123, Level: 60 Points: 8,123, Level: 60 Points: 8,123, Level: 60
Level Up 87% Completed
Level up: 87% Level up: 87% Level up: 87%
Forum Activity 23%
Activity: 23% Activity: 23% Activity: 23%
FF Reputation: 9 Magus2727 Good Standing Member
Buy-Sell-Trade Rating: (2)
I think the best way to do it is to install a new bung and wire up a dedicated O2 sensor. The bungs usually only cost $15 and a weld shop should be able to install one for 20 bucks or so. If you know electronics you can add a buffer stage between the O2 sensor and the A/F gauge do you dont change the impedance of the line.


A Tune does not make it not smog legal as long as you dont disable systems. And the only system I believe that would violate this would be if you disabled the EGR system.

I would get a triple and measure you oil pressure also...
__________________
2001 ZX3 2.0L Zetec-
Hatch Nation #42

Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)
Magus2727 is offline  
    Reply With Quote Quick reply to this message
Old 11-19-2012, 10:40 PM   #3
ratimpulse
Focus Rookie
 
Join Date: Feb 2012
Fan#: 95643
Location: West Bloomfield, MI
What I Drive: '05 Silver ST Boosted ;)

Posts: 18
FF Reputation: 1 ratimpulse Good Standing Member
Buy-Sell-Trade Rating: (1)
Just curious...
Why the need for an a/f gauge? Without a tune, the gauge will stay at 14.7
Seems like a waste of 200$. Get an Ultragauge and call it a day.
ratimpulse is offline  
    Reply With Quote Quick reply to this message
Old 11-19-2012, 10:56 PM   #4
Andrews-bad-SE
Focus Enthusiast
 
Join Date: Jun 2012
Fan#: 100389
Location: O'fallon, MO
What I Drive: 2003 Arizona Beige SE 4dr Zetec/ATX

Posts: 182
FF Reputation: 3 Andrews-bad-SE Good Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by ratimpulse View Post
Just curious...
Why the need for an a/f gauge? Without a tune, the gauge will stay at 14.7
Seems like a waste of 200$. Get an Ultragauge and call it a day.

I just thought having one would be cool. I saw a Sunpro one that has LED's that read "lean, ideal, and rich." It'd just be cool to see it work, it's only like 30 bucks. And I get a discount.
Andrews-bad-SE is offline  
    Reply With Quote Quick reply to this message
Old 11-19-2012, 11:34 PM   #5
Andrews-bad-SE
Focus Enthusiast
 
Join Date: Jun 2012
Fan#: 100389
Location: O'fallon, MO
What I Drive: 2003 Arizona Beige SE 4dr Zetec/ATX

Posts: 182
FF Reputation: 3 Andrews-bad-SE Good Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by Magus2727 View Post
I think the best way to do it is to install a new bung and wire up a dedicated O2 sensor. The bungs usually only cost $15 and a weld shop should be able to install one for 20 bucks or so. If you know electronics you can add a buffer stage between the O2 sensor and the A/F gauge do you dont change the impedance of the line.


A Tune does not make it not smog legal as long as you dont disable systems. And the only system I believe that would violate this would be if you disabled the EGR system.

I would get a triple and measure you oil pressure also...

That sounds like a better idea. How would I wire up a "buffer stage?" It sounds like a more feasible option.
Andrews-bad-SE is offline  
    Reply With Quote Quick reply to this message
Old 11-20-2012, 12:20 AM   #6
Magus2727
Focus Fanatic
 
Magus2727's Avatar
 
Join Date: Feb 2009
Fan#: 62897
Location: Salt Lake City, UT
What I Drive: 2001 Malibu Blue ZX3

Posts: 4,347
Points 8,123, Level 60
Points: 8,123, Level: 60 Points: 8,123, Level: 60 Points: 8,123, Level: 60
Level Up 87% Completed
Level up: 87% Level up: 87% Level up: 87%
Forum Activity 23%
Activity: 23% Activity: 23% Activity: 23%
FF Reputation: 9 Magus2727 Good Standing Member
Buy-Sell-Trade Rating: (2)
Look up "Unity Gain Op-Amp" and then see if it would be worth the effort. Cost you $4-$5 at radio shack you do need to look at data sheets to make sure you build a stable circuit but is not that hard... but then again I am an electrical engineer....

Personally it seams like you just want some flashy lights. a $30 A/F gauge is going to tell you nothing and most likely is not very accurate to start with. And what has been said above it will stay fixed at basically 14.7.. may drop to 14.6 or 14.5 at the high revs. So it will always stay ideal. I can wire you up a dial with an LED you plug in that will always illuminate lettering that says "Ideal" :-) give you good price....

What other gauges do you get a good discount on? go for oil pressure or oil temp or volt? those 3 you can easily do and will actually provide you with good information and be easy to install. You could also do a water temp, the gauge one is not very accurate. Its use is limited to Nominal temp and better shut the engine off.
__________________
2001 ZX3 2.0L Zetec-
Hatch Nation #42

Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)
Magus2727 is offline  
    Reply With Quote Quick reply to this message
Old 11-20-2012, 12:40 AM   #7
Andrews-bad-SE
Focus Enthusiast
 
Join Date: Jun 2012
Fan#: 100389
Location: O'fallon, MO
What I Drive: 2003 Arizona Beige SE 4dr Zetec/ATX

Posts: 182
FF Reputation: 3 Andrews-bad-SE Good Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by Magus2727 View Post
Look up "Unity Gain Op-Amp" and then see if it would be worth the effort. Cost you $4-$5 at radio shack you do need to look at data sheets to make sure you build a stable circuit but is not that hard... but then again I am an electrical engineer....

Personally it seams like you just want some flashy lights. a $30 A/F gauge is going to tell you nothing and most likely is not very accurate to start with. And what has been said above it will stay fixed at basically 14.7.. may drop to 14.6 or 14.5 at the high revs. So it will always stay ideal. I can wire you up a dial with an LED you plug in that will always illuminate lettering that says "Ideal" :-) give you good price....

What other gauges do you get a good discount on? go for oil pressure or oil temp or volt? those 3 you can easily do and will actually provide you with good information and be easy to install. You could also do a water temp, the gauge one is not very accurate. Its use is limited to Nominal temp and better shut the engine off.
Haha, man you're always a big help. You're pretty spot-on with the "wanting cool flashy lights" thing. I just thought that the cheaper A/F gauges were more accurate... But, now that I know otherwise, I'll steer clear of that! I have just always loved the look of pillar gauges. I'll probably do what you said, just oil pressure, temp and voltage.
Andrews-bad-SE is offline  
    Reply With Quote Quick reply to this message
Old 11-20-2012, 12:52 AM   #8
sleepyboy
FF's Night Security
 
sleepyboy's Avatar
 
Join Date: Nov 2004
Fan#: 15335
Location: SW Houston, TX, United States
What I Drive: 01' Yellow ZX3 euro, 04' ZX5 SVT

Posts: 26,346
Points 135,942, Level 100
Points: 135,942, Level: 100 Points: 135,942, Level: 100 Points: 135,942, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 64%
Activity: 64% Activity: 64% Activity: 64%
FF Reputation: 48 sleepyboy Great Standing Member
Buy-Sell-Trade Rating: (11)
narrow band a/f ratio gauges are just flashy lights. You want to get a wide band O2 or nothing at all. There are better gauges that will actually tell you whats going with the motor like oil pressure, oil temp, water temp, or even a trans temp gauge if you have a auto. I highly recommend getting a tune, and if you have a wide band O2 that can even help make the tune that much better by letting the tuner know what's the actually a/f ratio.
__________________
I started out with nothing and I still have most of it left

Hatch Nation #15 (Ole' Yeller') & #150 (The SVT)
Moderator for
Technical Chat
Zetec Performance Chat
Southern Fanatics Chat
sleepyboy is online now  
    Reply With Quote Quick reply to this message
Old 12-17-2012, 11:17 PM   #9
4g63T
Focus Rookie
 
Join Date: Dec 2012
Fan#: 107435
Location: Morgantown, WV
What I Drive: Boosted zx3

Posts: 6
FF Reputation: 1 4g63T Good Standing Member
Buy-Sell-Trade Rating: (0)
Sleepy has it right, tune before AFR gauge. Narrow band is pointless on the stock tune. Boosted, you will see differences of course. But not N/A. Widebands are always nice to have.
4g63T is offline  
    Reply With Quote Quick reply to this message
Old 12-17-2012, 11:24 PM   #10
disciplerocks
GT40 all the things!
 
disciplerocks's Avatar
 
Join Date: Sep 2008
Fan#: 59330
Location: Evansville, IN
What I Drive: 04 ZX3, 12 Hatch

Posts: 9,442
Points 13,185, Level 74
Points: 13,185, Level: 74 Points: 13,185, Level: 74 Points: 13,185, Level: 74
Level Up 84% Completed
Level up: 84% Level up: 84% Level up: 84%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 13 disciplerocks Great Standing Member
Buy-Sell-Trade Rating: (17)
Narrow bands are pointless period.
__________________
04 ZX3 Mostly Stock ["Best Non-SVT" FITF '12][3/13 ROTM][7/14 ROTM][2014 ROTY]
12 SE Hatch Sport & Winter Package, ST Front End
94 F150 XLT 5.0 HO, OBDII Swap
89 Bronco II XLT Crawler
disciplerocks is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:03 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat