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 Post subject: air/fuel meter
Posted: Wed Jul 06, 2005 5:56 pm 
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if i was to buy an air/fuel ratio gauge would it hook up to my oxygen sensor (ebII I6)?

Also what wiring is involved, just +12 earth and signal from the oxygen sensor?
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Posted: Wed Jul 06, 2005 6:02 pm 
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Yes, yes and sorta.

12v power - goes to an ACC/IGN 12v source.
Signal - goes to the HEGO signal in the loom
Ground - goes to HEGO GND in the loom

 

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Posted: Wed Jul 06, 2005 6:16 pm 
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sweet

so if i was to say buy virtually any gauge it'd go in fine? What kinda price am i looking at here? just looked at some autometers on ebay and they're like $100-150, will i encounter problems with something cheaper? (well not problems but not a true reading?)
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Posted: Wed Jul 06, 2005 6:21 pm 
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The meters are very simple. Its simply a voltimeter calibrated to show beteen 0.1v and 0.9v.

You can get jaycar kits that show HEGO voltage... i use an autometer one but only because I was wedged with $$$ at the time and couldnt be stuffed shopping around.

I assume you are aware of the limitations of the standard sensors?

 

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Posted: Wed Jul 06, 2005 6:23 pm 
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not really whats the limitations (sorry in a rush!)

but i wont be lashing out might look at jaycar kit cause im not scared of assembling electronics (and i'm cheap!)
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Posted: Wed Jul 06, 2005 6:32 pm 
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The limitation is that the cars are equipped with narrow band HEGOs. These sensors are very accurate around stoich ratio but essentially can only show 2 states - rich and lean (therefore if quickly switching between rich and lean, the mixture is at stoich).

Implications? Not much good for tuning at WOT. The meter will (hopefully) go to 'rich' under WOT obviously, but by the time it registers 'lean'... chances are it's too late, as even running at stoich under high loads will not do the engine any favours.

Uses? I use mine to 'watch' what EEC is doing. You can see when the computer is in closed loop and open loop.. basically a good gauge for telling that everything is working as it should be... something i needed when playing around with the MAF and chip etc.

No harm in them tho - the more you know about the ECU's activities the better IMO.

 

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Posted: Wed Jul 06, 2005 6:34 pm 
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Get a wideband HEGO and whip up a wideband meter kit.

Theres some DIY place in ACT who sells them online.

Can someone provide a link? Something like wbdo.com ?

 

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Posted: Wed Jul 06, 2005 6:39 pm 
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I got one of the jaycar kits but the problem with the standard O2 sensors is you can only really tell when the car is running at Stotiometric levels (14.7 A/F ratio) so you can only see if the cars running rich, Stotio and lean but you can't tell how rich or lean. To do that you need a Wideband O2 sensor, I got the 2E0 kit from here http://wbo2.com/default.htm
Have a look at the info there, Ive been running my kit for the last few weeks and can see where I could get some more power from I'm just waiting for my MegaSquirt ECU kit to arrive... :P

 

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Posted: Wed Jul 06, 2005 6:39 pm 
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http://www.techedge.com.au/vehicle/wbo2/builtwb.htm

 

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Posted: Wed Jul 06, 2005 7:17 pm 
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In my case, using my autometer AR to roughly tune the Wolf ecu was the difference between getting a good drivable tune and towing the car to a dyno/tuner.
What I found with the meter while road tuning was that it was easy to tell the difference between rich/stoich/lean while increasing/decreasing injector pulse widths but when it was borderlining in the stoich area it would flick to VERY lean quickly with just very small injector pulse adjustments... so I was usually left wondering whether I should richen up a certain load/rpm point or leave it.
Nothing beats a wideband meter on a dyno for tuning, but for generally keeping an eye on the motor they are definatly worth having. Especially if your into doing intake mods and the like
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Posted: Thu Jul 07, 2005 11:37 am 
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Sorry 4.9 EF Futura!

Stepped out the door of work and realised what you meant, and yeah i am aware of the stock narrowband sensor limitation.

If i was to get a wideband sensor, how much would i be looking at, what model, where from (pref victoria), will it bolt straight in, will i have to cut wires etc .. i think you guys know what im on about!

Also does the wideband sensor improve the performance of the EEC, or at least not freak out on me and do weird stuff.

thanks for the replies guys.
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Posted: Thu Jul 07, 2005 11:59 am 
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I think it depends on the controller you get for the wideband O2.

Some of them can 'emulate' the switching signal produced by a narrowband HEGO - which can therefore be used by EEC.

Other ppl simply weld in a second bung for the wideband o2. Leave stock sensor/EEC untouched and run the wideband for the controller/readout.

As for ordering - i'd say those links would be your best bet...

 

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Posted: Thu Jul 07, 2005 12:16 pm 
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really.

I thought it'd just wire directly up the EEC and the EEC would be fine.. but then again :\

Wouldn't the EEC just see the engine go a little bit rich and then lean off a bit to correct it, rather than it seemingly going really really rich.

Spose not, can't have it all.. damn ford ! :\ my plans of having a lambda guage are slowly slipping away :\\

I spose i'll just have to look around a bit and then decide what i wanna do.

thanks guys :)
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Posted: Thu Jul 07, 2005 12:44 pm 
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i got one of the jaycar kits, does the job for me, i found that if i wired the 3 wires straight to the oxy sensor it gave me the most accurate reading, if you run it thru acc12v+ it gets heaps of inteference and goes a bit wacko with indicators etc, the sensor has a gnd a 12v+ and the ego reading, works well

 

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Posted: Thu Jul 07, 2005 12:55 pm 
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glenneaux wrote:
really.

I thought it'd just wire directly up the EEC and the EEC would be fine.. but then again :\

Wouldn't the EEC just see the engine go a little bit rich and then lean off a bit to correct it, rather than it seemingly going really really rich.

Spose not, can't have it all.. damn ford ! :\ my plans of having a lambda guage are slowly slipping away :\\

I spose i'll just have to look around a bit and then decide what i wanna do.

thanks guys :)


Have a dig around those links as there's a fair bit of info on the difference between narrowband and wideband oxy sensors...

http://wbo2.com/2a0/2a0info.htm

Basically you need to look at the correlation between voltage output and AFR for each given sensor.

 

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