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Old 08-09-2004, 08:00   #1 (permalink)
Prof. Rabbit
 
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adding a fuel mixture display

Hi Ppls,

I've just built a fuel mixture display for my EA (MPI) EECIV, (this is a Jaycar kit)
as I run mostly on lpg I'd like to keep an eye on the lpg's state of tune.
I need to loop into the EGO output lead, where is the easiest place to splice into
the EGO? (other than the EGO itself - too close to the exhaust)

Thanks
Prof. Rabbit
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Old 08-09-2004, 08:31   #2 (permalink)
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Re: adding a fuel mixture display

The easiest place I think would be at the ECU. The EGO input to the ECU is pin 29, so just splice into this wire. It might already be spliced here mine was to run the Lpg feedback/closedloop computer. A diagram and pinouts can be found at www.fordmods.com
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Old 08-10-2004, 21:24   #3 (permalink)
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Re: adding a fuel mixture display

Thanks for the info, have you added a display and if so has it been useful?
thanks
Prof. Rabbit

Quote:
Originally Posted by NC Steve
The easiest place I think would be at the ECU. The EGO input to the ECU is pin 29, so just splice into this wire. It might already be spliced here mine was to run the Lpg feedback/closedloop computer. A diagram and pinouts can be found at www.fordmods.com
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Old 08-12-2004, 20:16   #4 (permalink)
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Re: adding a fuel mixture display

just wondering, how much did this kit cost you? and how does it display the fuel mix? does it read of the O2 sensor in the exhaust or something? would be interested as i believe my car is running rich.
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Old 08-14-2004, 07:59   #5 (permalink)
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Re: adding a fuel mixture display

The kit is quite cheap at $15, comes from Jaycar as kit no. KC 5195, it uses the
EGO sensor as the reference and displays either a bar graph or dot graph
(depending on your preference) across 10 leds.

There is a later (and more comprehernsive) kit available, however unless your
engine is much modified and/or has adjustable mixture the expensive kit is not
likely to be a great deal better.

Note, you need fair skills in electronic soldering, the kit is simple, contains few
parts, and well documented, a socket is provided for the IC etc.

Regards Prof. Rabbit


Quote:
Originally Posted by RedEF6
just wondering, how much did this kit cost you? and how does it display the fuel mix? does it read of the O2 sensor in the exhaust or something? would be interested as i believe my car is running rich.
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Old 08-15-2004, 06:36   #6 (permalink)
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Re: adding a fuel mixture display

So this kit is to monitor the LPG's tuning. I would also like to fit one of these as my car is straight LPG and im allways cautious about how its running. So you have any pics of what the LED's look like?
thx
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Old 08-16-2004, 03:25   #7 (permalink)
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Re: adding a fuel mixture display

You can go to the Jaycar website:
www.jaycar.com.au look up the kit no. KC5195
you will find a picture as well other info.
regards Prof. Rabbit

Quote:
Originally Posted by InitialD
So this kit is to monitor the LPG's tuning. I would also like to fit one of these as my car is straight LPG and im allways cautious about how its running. So you have any pics of what the LED's look like?
thx
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Old 08-16-2004, 03:37   #8 (permalink)
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Re: adding a fuel mixture display

Be wary as all these cheap kits are NARROWBAND only. And should not be used for any sort of tuning.
They are only acurate around 14.7:1, as they are designed to be used for closed loop operations....

For true readings you need a WIDEBAND sensor and reader. They vary in price from around $400 for a DIY kit to $2000....

I'm using a meter from Innovate! that works very well and is accurate compared with dyno widebands... it was about $AU600...
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Old 08-17-2004, 08:12   #9 (permalink)
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Re: adding a fuel mixture display

Your quite correct, these are designed as an indicator, not as a tuning tool,
that being said you can at least keep a check on the state of your engine
mixture with this kit.

Jaycar also has a digital kit that reads the EGO and displays both a bar graph
and the ratio, there is also a mod for this kit that turns it into a very good
wideband reader, and for a very low cost. (see link )

http://www.techedge.com.au/vehicle/wbo2/5300.htm

Regards Prof. rabbit


Quote:
Originally Posted by RotaryPower3
Be wary as all these cheap kits are NARROWBAND only. And should not be used for any sort of tuning.
They are only acurate around 14.7:1, as they are designed to be used for closed loop operations....

For true readings you need a WIDEBAND sensor and reader. They vary in price from around $400 for a DIY kit to $2000....

I'm using a meter from Innovate! that works very well and is accurate compared with dyno widebands... it was about $AU600...
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Old 08-17-2004, 22:14   #10 (permalink)
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Re: adding a fuel mixture display

I've actually got that jaycar kit madeup! :)
The only prob I see with doing what that techedge page said was that you have no temp control curcuit for the sensor. As I'm sure you're aware an unregulated sensor (even a WB) will be inacurate. But it'd still be more acurate than your standard narrowband setup.:)
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