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Ford Sierra / Sapphire / RS500 Cosworth This forum is for discussion of all things pertaining to the Ford Sierra Cosworth.

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Old 04-02-2010, 10:29 PM   #1
cosy trav
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Default Lumenition Air fuel ratio meter

Ive just bought a Lumenition Air fuel ratio meter and wondered if you can use these meters to set up the base mixture ? Its the 19 LED version .
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Old 05-02-2010, 06:30 AM   #2
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I doubt it. These use usually narrow-band oxygen sensors.
I use a wideband unit, something like this: http://www.plxdevices.com/wideband.html
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Old 05-02-2010, 10:09 PM   #3
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The reason im asking is that when its idling its 2 yellow leds above Lambda 1 setting and goes to the 1st green light when boosting which means it running rich but not getting to the max power mark at 3 green leds so was going to turn the co screw clockwise a bit to richen it up a bit but didnt want to upset the idle co setting . Im new to all this tuning malarkey LOL .
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Old 05-02-2010, 11:12 PM   #4
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i wouldnt adjust anything using a narrow band mate
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Old 06-02-2010, 01:42 PM   #5
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The overall fuel graph is fixed by the chip so affecting one end of the scale will affect the other.
So long as it's a decent chip and set to the CO advised by the maker/supplier I wouldn't take any notice of what the gauge says, narrow band are very accurate but only over a very short range.
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Old 06-02-2010, 01:42 PM
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air, cosworth, fuel, fuelair, gauge, lumenition, meter, ratio, sierra

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