carb tuning

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carb tuning

Post  quick 52 on September 20th 2012, 1:55 pm

going to the track next week and got a innovate wideband installed for the day what is a good wot a/f reading

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Re: carb tuning

Post  kim on September 20th 2012, 3:07 pm

13-1 is stiometric for gasoline, most try and tune a tad to the rich, so a high 12 is ideal, on EFI cars there are times its leaner than 22-1 but the timming gets pulled WAY back.


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Re: carb tuning

Post  quick 52 on September 20th 2012, 3:49 pm

was at a dyno session and the best power they made was at 12.0 i dont know where mine is till next sat.

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Re: carb tuning

Post  kim on September 20th 2012, 4:04 pm

every engine is differnt, as is every gallon of gas, to say dyno this or engine that, you have to match paramaters exactly, combustion chamber shape, timming advance, head material, and of course the fuel specific gravity. All gasoline is blended a bit differnt, summer, winter, altitude, sea level, every manufacture has a few differnt widgets they add or don't add that really changes whats perfect for a tune.

Gasoline on that combination that day might have been pump gas, and might have had a bunch of alcohol in it. OR conversly, could have been high end race gas with lots of knock inhibitors in it, and that combination might have been running 36 degrees advance on a small combustion chamber......... etc.

Never know till you test and tune your combination.

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