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Old 11-11-2003, 22:03   #1 (permalink)
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Correct Air Fuel Ratio for Falcons

G'day fellas, I've just been reading my Max Ellery EA-ED manual...

Fuel Mixture
The Fuel Mixture is adjusted at 14.7:1 and ideally maintained at that by the ECM.

On a the recent SA dyno day i discovered my ratio was actually 11.5:1! The guys at blackwood dyno used an addon fuel regulator to change it to about 12.5 and I gained about 4rwkw. they were trying to sell me this fuel regulator for $360, but im not so keen. I was wondering if there actually is something wrong with one of the ECU's sensors, as the mix is out (according to my book anyway) by 25%. The Intake is stock, with regular paper element, perhaps upgrading this would be beneficial?

cheers.
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Old 11-11-2003, 22:44   #2 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

14:7 is for cruse but would be bad for accellerating etc..Wot is about right at 12.5 could be leaner ????The trouble with tuning by f/p is that it changes it over the whole rpm range and effects other things like acccelerator pump set in ecu etc..
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Old 11-12-2003, 02:25   #3 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

Have you got extractors on it? If so you may want to look at where the o2 sensor is mounted. If it is only sampling from three pots, or it could be too far downstream this can sometimes give you afr problems.
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Old 11-12-2003, 03:09   #4 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

Correct but at wot they don't come into the equation..tmk...
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Old 11-12-2003, 03:31   #5 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

Barry, it wasn't just you, all the I6 falcons were running rich some up to 10:1. 11.5:1 is what they probably run out of the factory, ford always set them rich. If you search around you will probably be able to find adjustable regulators for around $100 if you want to fine tune it.
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Old 11-12-2003, 03:52   #6 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

yeah i think i might, any idea who sells them?
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Old 11-12-2003, 05:18   #7 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

Ford tune there cars rich from the factory but even 10:1 at wot is a bit too rich. I have an EA falcon that averaged 14l/100 km in city driving. I switched over to a programable engine management system only recently and I'm getting heaps better economy now that I've tuned it more lean I think its using about 12.5l/100km.
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Old 11-12-2003, 17:41   #8 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

switching engine management systems is a little over my budget, an adjustable fuel regulator seems like the go. I saw one on eBay, but it had 1-5psi..... falcon fuel pumps are closer to 30psi :)
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Old 11-12-2003, 17:59   #9 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

yeah the 1-5psi are for carbies. My EFI one is 35-95psi. Don't know where to get decent priced I6 ones from, hopefully someone has some idea. I don't think the V8 ones would fit, can't remember how the 6cyl are set up.
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Old 11-14-2003, 01:15   #10 (permalink)
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Re: Correct Air Fuel Ratio for Falcons

yeah - as others have said - 14.7 is for cruise, it should go richer than that at WOT, but not to 10:1 like my car does - "&%#$((*&^)ing POS" LOL

im going full aftermarket very soon *still waiting for it to arrive* which should fix this, and gain me some horsies :D
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