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Old 07-24-2005, 05:29 PM
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how to ajust carburetor with air/fuel ratio meter

Hi!, I was installing 1 sensor by headers and install 2 air/fuel ratio meter. I read the instruction, but I have few question! (the meter is from summit racing, the 10 leds)

They said in the instruction I have to see 2 red, yellow and 1 green to have a stoichimietric condition (probably mean perfect tunning of the carburetor).

MY QUESTION IS: At what rpm I have to ajust the carburetor with the air/fuel ratio meter, 1000 rpm, I have to be on the park position or in drive position???

They also said at full throotle, I have to see all or most of the bars lit...If I understand, I have to see half of the bars lit and at full throttle full of the light lit...

Can anybody are able to help me!.

1 question: at what rpm I have to ajust the carb??
2 question: in park postion or drive postions on my transmission??

Does anybody have more hint to help me to ajust this carburetor (mighty demon 750 Double pumper)

Thanks in advance!

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Old 07-25-2005, 09:40 AM
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Tuning carb help

Common, anybody here in Hotrodder sites have not tuned a carb with an air/fuel ratio meter....I just want to know if I have to tuned the carb (with the 2 meter) in Park position, or drive position and if I have to do this at idle or another RPM??

THANKS IN ADVANCE TO HELP ME!!!!!
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Old 07-25-2005, 10:05 AM
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That is a narrow band O2 sensor you have. It is most accurate recording 14.7:1 fuel ratio (stoich). What that means is it's best used to tune idle and cruise mixtures. At idle with the engine in park obseve the gauge and note if it is rich or lean. If rich you'll want to turn in the fuel mixture screws, if lean turn them out. Small changes are needed and each screw needs to be turned the same amount. Under cruise conditions you'll also affect the mixture with the idle screws as well as the primary jets. Shoot for a reading of stoich under these conditions as well.
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Old 07-25-2005, 10:12 AM
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Adjust idle settings in Drive. The engine is under load and you spend much more time in drive than you do in neutral while driving. Then you can try to find a happy medium with idle speeds and fuel mixes in park.
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