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Hi all,
Just wondering if anybody knows of an affordable way to measure the air/fuel ratio of a carburetted car (308 V8)?
Reason for this is that I wish to calibrate my quadrajet carby (to get better economy without killing engine at W.O.T. - i.e. focussing on part-throttle tuning) and know that you can't go by plug colour any more. I'm asking this question because I was scared off by high quotes for "dyno" sessions and don't mind spending some money if it gets me a meter I can use from time to time. I should mention that I am competent with electronics and could build one if anyone knows of a kit or circuit just in case the commercially-available ones are too expensive. Air-fuel ratios I need to measure would be say 12.25:1 to 15:1 (W.O.T. to no-load part throttle). Alternatively, if anyone knows of a affordable gas meter (such as CO meter) then I would also like to hear about this please. All suggestions greatly appreciated.
Cheers,
Paul E
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I would suggest getting a nut brazed into your exhaust - either at the extractors or at the worst case - past the end of the extractors in the ehxuast.
Fit a readliy (and cheaply) available VN-VR V6 oxysensor in there, and build the jaycar air/fuel
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Thanks for the suggestion, sound like a good idea. Has anybody built this kit and does it work? The reason I ask is that I did a quick search on the net and there are a lot of sites that say that nly real way to measure A/F mixtures is to use a wideband (
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I can't really help you more with that mate as I've only seen 1 in action (I put the kit together for him) on a VN running off the factory oxy sensor.
Cheers,
Mick
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Mick,
Very interested in talking to you a bit more about the O2 sensor thing. Have spotted this on a couple of American Quadrajet sites/forums.....
Jaycar have a digital a/f meter. Would this need to be calibrated? Guess this would depend on wher
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Hi Paul,
The guys here are right it has to be put close to the heat source. It can't go up the rear end as some people might think.
I may be wrong but you may need two pickup points if running a dual plain manifold. For either side of the Quaddie.
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Kev, feel free to drop around sometime. I'll be home on suday if you want to have a yarn |
Cheers,
Mick
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Autometer have an a/f guage. I have recently installed a digital one put out by ART that does a/f, revs and what they call torque (is a high tech condenser from what I can figure out from the very limited and stilted manual). THe rev feature is handy, bu |
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