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Old 12-07-2003, 20:52   #1 (permalink)
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A/F guages

Just wondering where I could get a (fairly cheap) aif/fuel guage, cause I really wanna get a bit more of an idea of whats going on with mixtures..

Doug managed to get an A/F, Oil pressure and water temp (I think those were the readouts) guage for cheaps of eBay, I can't seem to find anything like that.. any help doug?

Thanks

Juarez
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Old 12-07-2003, 23:23   #2 (permalink)
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Re: A/F guages

for $13 jaycar sell a digital mixture display, works good on my car, i can see where its better to cruise at.
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Old 12-07-2003, 23:28   #3 (permalink)
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Re: A/F guages

$13?! Neat, Autospeed sells one for $85!

was there much involved in hooking it up?
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Old 12-07-2003, 23:29   #4 (permalink)
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Re: A/F guages

2 wire to the cigarete lighter wireing, 1 wire into the engine bay to the sensor. pretty easy. hardest bit is making a box to put the pcb into.
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Old 12-08-2003, 00:01   #5 (permalink)
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Re: A/F guages

Would the PCB fit inside the ash-tray just next to the ciggy lighter? (you know the one, on an EA..), cause that would be pretty neat
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Old 12-08-2003, 00:20   #6 (permalink)
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Re: A/F guages

That is awesome guys !
I never even considered that Jaycar would do a kit like this.
It seems that they do two versions, an old one that has a bar graph (the $13 one) - Click Here

And a newer one that actually has both the mixture and a graph for $63 Click Here

Anyone actually using one ?

qwikcorty - I bow down to you !

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Old 12-08-2003, 00:31   #7 (permalink)
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Re: A/F guages

hahaha no worries guys! only here to help. good to watch the ecu doin its thing too.

the pcb will easily fit in the ash tray. i have mine in a small box, in the sunnies/wallet gap atm.
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Old 12-08-2003, 04:29   #8 (permalink)
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Re: A/F guages

I have the good one in my car all the time .. it works great but it's a pain to build but i helped me find out a lot of info like cynder 6 wasn't firing right and the car is running lean under revs and rich on idle..( this problem i haven't fixed as yet still looking into it)
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Old 12-08-2003, 11:08   #9 (permalink)
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Re: A/F guages

Thanks for the info qc, that is one "add on" that is worth more than what you pay for it. Now if I can just finish assembling my 12V timer switch

cheers
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Old 12-09-2003, 22:04   #10 (permalink)
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Re: A/F guages

Okies.
I've done a little more research on the whole A/F / ego thing, and come up with some useful info. It seems that for a non-permanent solution, you can just hook up a DMM (must be digital with high impedance, or you will screw around with the sensors operation), and watch the voltage output.
As in the following links, it should be 0-1V (0 = ultra lean, 1= ultra rich) - but the response of the sensor does not seem to be linear. I thought this was especially interesting, since depending on the design of the more expensive jaycar kit, it could be less than totally accurate . . .
If nothing else, it gives some good ideas on how to test them, and check that everything is happy (something I'm going to have a bash on hopefully tomorrow...)
Follwing is also an interesting graph from one of the pages. I'm not sure how closely all ego's respond, but from the various info I can find, it seems that they are all fairly similar. However, if anyone has any info specific to the hego that we get in Falcons it would be great ! :)
http://www.wps.com/LPG/o2sensor.html
http://www.buckeyetriumphs.org/techn.../AFMonitor.htm
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